b612
9ee2163cc7
- 新增月掩恒星和行星：支持搜索、掩甚点、全球掩带及固定地点轨迹计算 - 支持恒星星表坐标转换、有限盘面行星接触事件和月掩 SVG 输出 - 新增日月食及月掩全球投影图、时间标记和 GeoJSON 地理数据接口 - 扩展日食中心线、南北界及偏食足迹采样，支持极区投影 - 修正站心时角、月出月落、月球视半径、折射和恒星自行计算 - 优化内外行星事件搜索、边界选择、极端输入处理和计算稳定性
784 lines
32 KiB
Go
784 lines
32 KiB
Go
package svg
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import (
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"errors"
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"fmt"
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"html"
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"math"
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"strings"
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"time"
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"b612.me/astro/internal/svgasset"
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"b612.me/astro/moon"
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)
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const (
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localPlanetOccultationSVGDefaultWidth = 1040
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localPlanetOccultationSVGDefaultHeight = 760
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localPlanetOccultationSVGMinimumWidth = 760
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localPlanetOccultationSVGMinimumHeight = 600
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localPlanetOccultationSVGDefaultStep = 2 * time.Minute
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)
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// ErrInvalidLocalPlanetOccultationSVGOptions 表示本地行星图表选项无效。
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// ErrInvalidLocalPlanetOccultationSVGOptions reports invalid local planetary chart options.
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var ErrInvalidLocalPlanetOccultationSVGOptions = errors.New("invalid local planetary occultation SVG options")
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// ErrInvalidLocalPlanetOccultationInfo 表示固定地点行星事件数据格式错误。
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// ErrInvalidLocalPlanetOccultationInfo reports malformed fixed-site planetary event data.
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var ErrInvalidLocalPlanetOccultationInfo = errors.New("invalid local planetary occultation info")
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// LocalPlanetOccultationSVGOptions 控制固定地点月球与行星盘面图。
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// LocalPlanetOccultationSVGOptions controls a fixed-site Moon-planet disk chart.
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type LocalPlanetOccultationSVGOptions struct {
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// Width 和 Height 是 SVG 画布尺寸；非正值使用默认值。
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// Width and Height are SVG canvas dimensions. Values <= 0 use defaults.
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Width int
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Height int
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// Step 是月心行星轨迹请求采样步长；零值使用两分钟，负值无效，正值小于一秒时提升到一秒。长事件可能增大实际步长，以保持基础轨迹在有界采样预算内。
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// Step is the requested Moon-centered planetary-track sampling step. Zero uses two minutes; negative values are invalid. Positive values below one second are raised to one second, and long events may use a larger effective step to keep the base track within its bounded sample budget.
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Step time.Duration
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// 空文本字段使用本地化的自动标签。
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// Empty text fields use localized automatic labels.
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Title string
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SummaryText string
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GreatestText string
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OverviewTitle string
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PhasePanelsTitle string
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ContactsTitle string
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DirectionText string
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FooterNote string
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// Language 为 "en" 时使用英文，其他值使用中文。
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// Language uses English for "en" and Chinese for every other value.
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Language string
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// Location 控制显示的事件时刻；nil 使用 UTC+8。
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// Location controls displayed event times. Nil uses UTC+8.
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Location *time.Location
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}
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type localPlanetOccultationEventFrame struct {
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label string
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name string
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time time.Time
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hidden bool
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frame moon.PlanetOccultationDiagramFrame
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}
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// FindLocalPlanetOccultationSVGs 搜索固定观测地点，并渲染请求时间窗口内的每次有限盘面行星月掩。空切片表示没有本地事件。
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// FindLocalPlanetOccultationSVGs searches one fixed observing site and renders every finite-disk planetary occultation in the requested time window. An empty slice means no local event.
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func FindLocalPlanetOccultationSVGs(
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start, end time.Time,
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planet moon.OccultationPlanet,
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longitude, latitude, height float64,
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searchOptions moon.OccultationSearchOptions,
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options LocalPlanetOccultationSVGOptions,
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) ([]string, error) {
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if err := validateLocalPlanetOccultationSVGOptions(options); err != nil {
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return nil, err
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}
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events, err := moon.FindPlanetOccultations(
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start, end, planet, longitude, latitude, height, searchOptions,
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)
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if err != nil {
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return nil, err
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}
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diagrams := make([]string, 0, len(events))
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for _, event := range events {
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diagram, renderErr := LocalPlanetOccultationSVG(event, options)
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if renderErr != nil {
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return nil, renderErr
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}
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diagrams = append(diagrams, diagram)
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}
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return diagrams, nil
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}
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// LocalPlanetOccultationSVG 渲染已求解的固定地点行星月掩的月心轨迹及适用的 C1-C4 阶段面板；不会运行事件搜索。
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// LocalPlanetOccultationSVG renders an already solved fixed-site planetary occultation as a Moon-centered track with all applicable C1-C4 stage panels. It does not run the event search.
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func LocalPlanetOccultationSVG(
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info moon.PlanetOccultationInfo,
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options LocalPlanetOccultationSVGOptions,
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) (string, error) {
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if err := validateLocalPlanetOccultationInfo(info); err != nil {
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return "", err
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}
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if err := validateLocalPlanetOccultationSVGOptions(options); err != nil {
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return "", err
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}
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options = normalizeLocalPlanetOccultationSVGOptions(options)
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diagram := moon.PlanetOccultationDiagram(info, moon.PlanetOccultationDiagramOptions{
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StepDays: options.Step.Hours() / 24,
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})
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if len(diagram.Frames) == 0 {
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return "", fmt.Errorf("%w: diagram geometry is unavailable", ErrInvalidLocalPlanetOccultationInfo)
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}
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return renderLocalPlanetOccultationSVG(info, diagram, options), nil
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}
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func validateLocalPlanetOccultationSVGOptions(options LocalPlanetOccultationSVGOptions) error {
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if options.Width > 0 && options.Width < localPlanetOccultationSVGMinimumWidth {
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return fmt.Errorf("%w: width must be zero or at least %d", ErrInvalidLocalPlanetOccultationSVGOptions, localPlanetOccultationSVGMinimumWidth)
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}
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if options.Height > 0 && options.Height < localPlanetOccultationSVGMinimumHeight {
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return fmt.Errorf("%w: height must be zero or at least %d", ErrInvalidLocalPlanetOccultationSVGOptions, localPlanetOccultationSVGMinimumHeight)
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}
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if options.Step < 0 {
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return fmt.Errorf("%w: step cannot be negative", ErrInvalidLocalPlanetOccultationSVGOptions)
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}
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return nil
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}
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func validateLocalPlanetOccultationInfo(info moon.PlanetOccultationInfo) error {
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if err := info.Planet.Validate(); err != nil {
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return fmt.Errorf("%w: %v", ErrInvalidLocalPlanetOccultationInfo, err)
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}
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if err := info.Observer.Validate(); err != nil {
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return fmt.Errorf("%w: %v", ErrInvalidLocalPlanetOccultationInfo, err)
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}
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if !info.ContactsComplete || info.ExternalImmersion.IsZero() || info.Greatest.IsZero() || info.ExternalEmersion.IsZero() {
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return fmt.Errorf("%w: complete external contacts and greatest time are required", ErrInvalidLocalPlanetOccultationInfo)
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}
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if info.Greatest.Before(info.ExternalImmersion) || info.ExternalEmersion.Before(info.Greatest) {
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return fmt.Errorf("%w: event times must be ordered", ErrInvalidLocalPlanetOccultationInfo)
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}
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if info.Type == moon.OccultationTotal {
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if !info.HasInternalContacts || info.InternalImmersion.IsZero() || info.InternalEmersion.IsZero() ||
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!info.InternalImmersion.After(info.ExternalImmersion) || !info.InternalImmersion.Before(info.Greatest) ||
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!info.InternalEmersion.After(info.Greatest) || !info.InternalEmersion.Before(info.ExternalEmersion) {
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return fmt.Errorf("%w: a total event requires ordered C2 and C3 contacts", ErrInvalidLocalPlanetOccultationInfo)
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}
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} else if info.Type != moon.OccultationPartial && info.Type != moon.OccultationGrazing {
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return fmt.Errorf("%w: unsupported finite-disk geometry %q", ErrInvalidLocalPlanetOccultationInfo, info.Type)
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} else if info.HasInternalContacts || !info.InternalImmersion.IsZero() || !info.InternalEmersion.IsZero() {
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return fmt.Errorf("%w: partial and grazing events cannot contain internal contacts", ErrInvalidLocalPlanetOccultationInfo)
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}
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if !starOccultationFinite(info.MinimumSeparationArcsec) || info.MinimumSeparationArcsec < 0 ||
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!starOccultationFinite(info.MoonSemidiameterArcsec) || info.MoonSemidiameterArcsec <= 0 ||
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!starOccultationFinite(info.PlanetSemidiameterArcsec) || info.PlanetSemidiameterArcsec <= 0 ||
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info.PlanetSemidiameterArcsec >= info.MoonSemidiameterArcsec ||
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!starOccultationFinite(info.PositionAngleDeg) ||
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!starOccultationFinite(info.MoonAltitudeAtGreatest) ||
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!starOccultationFinite(info.MoonAzimuthAtGreatest) {
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return fmt.Errorf("%w: event geometry must be finite", ErrInvalidLocalPlanetOccultationInfo)
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}
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return nil
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}
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func normalizeLocalPlanetOccultationSVGOptions(options LocalPlanetOccultationSVGOptions) LocalPlanetOccultationSVGOptions {
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if options.Width <= 0 {
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options.Width = localPlanetOccultationSVGDefaultWidth
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}
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if options.Height <= 0 {
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options.Height = localPlanetOccultationSVGDefaultHeight
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}
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if options.Step <= 0 {
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options.Step = localPlanetOccultationSVGDefaultStep
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}
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if options.Location == nil {
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options.Location = time.FixedZone("UTC+8", starOccultationSVGDefaultZone)
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}
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if strings.EqualFold(options.Language, starOccultationSVGLanguageEnglish) {
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options.Language = starOccultationSVGLanguageEnglish
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} else {
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options.Language = starOccultationSVGLanguageChinese
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}
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return options
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}
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func renderLocalPlanetOccultationSVG(
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info moon.PlanetOccultationInfo,
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diagram moon.PlanetOccultationDiagramResult,
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options LocalPlanetOccultationSVGOptions,
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) string {
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title := localPlanetOccultationSVGTitle(info, options)
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headerLines := localPlanetOccultationSVGHeaderLines(info, options)
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headerBottom := 72.0 + float64(len(headerLines))*19
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layout := localPlanetOccultationSVGLayoutFor(options, headerBottom)
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events := localPlanetOccultationSVGEventFrames(info, diagram.Frames, options.Language)
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var b strings.Builder
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fmt.Fprintf(&b, `<svg xmlns="http://www.w3.org/2000/svg" width="%d" height="%d" viewBox="0 0 %d %d" role="img" aria-label="%s">`,
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options.Width, options.Height, options.Width, options.Height, html.EscapeString(title))
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b.WriteString(`<defs>`)
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b.WriteString(svgasset.MoonFaceSymbol())
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b.WriteString(`<marker id="local-planet-occultation-arrow" viewBox="0 0 10 10" refX="8" refY="5" markerWidth="5" markerHeight="5" orient="auto-start-reverse"><path d="M 0 0 L 10 5 L 0 10 z" fill="#9b3f36"/></marker>`)
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b.WriteString(`</defs>`)
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b.WriteString(`<rect width="100%" height="100%" fill="#efefed"/>`)
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fmt.Fprintf(&b, `<rect x="22" y="18" width="%.3f" height="%.3f" fill="#ffffff" stroke="#c9c9c6" stroke-width="1.2"/>`, layout.width-44, layout.height-36)
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fmt.Fprintf(&b, `<text x="%.3f" y="44" fill="#111111" font-family="Georgia, 'Times New Roman', serif" font-size="%d" font-weight="700" text-anchor="middle">%s</text>`,
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layout.width/2, starOccultationTitleFontSize(title, layout.width), html.EscapeString(title))
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fmt.Fprintf(&b, `<line x1="%.3f" y1="57" x2="%.3f" y2="57" stroke="#555" stroke-width="1"/>`, layout.width/2-78, layout.width/2+78)
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for index, line := range headerLines {
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fontSize, fill := 13, "#3b4143"
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if index == 0 {
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fontSize, fill = 14, "#222222"
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}
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fmt.Fprintf(&b, `<text x="%.3f" y="%.3f" fill="%s" font-family="Georgia, 'Times New Roman', serif" font-size="%d" text-anchor="middle">%s</text>`,
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layout.width/2, 82+float64(index)*19, fill, fontSize, html.EscapeString(line))
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}
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writeLocalPlanetOccultationOverview(&b, diagram, events, layout, options)
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writeLocalPlanetOccultationContacts(&b, events, layout, options)
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writeLocalPlanetOccultationStages(&b, events, layout, options)
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writeLocalPlanetOccultationFooter(&b, info, layout, options)
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b.WriteString(`</svg>`)
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return b.String()
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}
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func localPlanetOccultationSVGLayoutFor(
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options LocalPlanetOccultationSVGOptions,
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headerBottom float64,
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) localStarOccultationSVGLayout {
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width := float64(options.Width)
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height := float64(options.Height)
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margin := math.Max(34, math.Min(44, width*0.045))
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gap := math.Max(18, math.Min(24, width*0.025))
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panelWidth := math.Max(210, math.Min(258, width*0.25))
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overviewLeft := margin
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overviewRight := width - margin - panelWidth - gap
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footerSpace := 88.0
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stageHeight := math.Max(156, math.Min(190, height*0.25))
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stageBottom := height - footerSpace
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stageTop := stageBottom - stageHeight
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overviewTop := headerBottom + 26
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overviewBottom := stageTop - 20
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return localStarOccultationSVGLayout{
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width: width,
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height: height,
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margin: margin,
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overviewLeft: overviewLeft,
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overviewRight: overviewRight,
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overviewTop: overviewTop,
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overviewBottom: overviewBottom,
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panelX: overviewRight + gap,
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panelWidth: panelWidth,
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stageTop: stageTop,
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stageBottom: stageBottom,
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footerY: height - 62,
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}
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}
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func writeLocalPlanetOccultationOverview(
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b *strings.Builder,
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diagram moon.PlanetOccultationDiagramResult,
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events []localPlanetOccultationEventFrame,
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layout localStarOccultationSVGLayout,
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options LocalPlanetOccultationSVGOptions,
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) {
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fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#161a1b" font-family="Georgia, 'Times New Roman', serif" font-size="14" font-weight="700">%s</text>`,
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layout.overviewLeft, layout.overviewTop-10, html.EscapeString(localPlanetOccultationSVGOverviewTitle(options)))
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cx := (layout.overviewLeft + layout.overviewRight) / 2
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cy := (layout.overviewTop+layout.overviewBottom)/2 + 4
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extent := localPlanetOccultationSVGExtent(diagram.Frames)
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availableWidth := layout.overviewRight - layout.overviewLeft - 74
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availableHeight := layout.overviewBottom - layout.overviewTop - 50
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scale := math.Min(availableWidth/(2*extent), availableHeight/(2*extent))
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if !starOccultationFinite(scale) || scale <= 0 {
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scale = 1
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}
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mapX := func(value float64) float64 { return cx - value*scale }
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mapY := func(value float64) float64 { return cy - value*scale }
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moonRadius := localPlanetOccultationSVGMaximumMoonRadius(diagram.Frames) * scale
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writeLocalStarOccultationAxes(b, cx, cy, moonRadius, options.Language)
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writeLocalPlanetOccultationLunarPath(b, diagram.Frames, mapX, mapY, extent, options.Language)
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writeLocalPlanetOccultationTrack(b, diagram.Frames, mapX, mapY)
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for _, event := range events {
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writeLocalPlanetOccultationDisk(b,
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mapX(event.frame.PlanetXArcsec), mapY(event.frame.PlanetYArcsec),
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event.frame.PlanetRadiusArcsec*scale, false, "overview-planet-disk", event.label,
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)
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}
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writeLocalStarOccultationMoon(b, cx, cy, moonRadius, "overview-moon")
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for _, event := range events {
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x := mapX(event.frame.PlanetXArcsec)
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y := mapY(event.frame.PlanetYArcsec)
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if event.hidden {
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writeLocalPlanetOccultationDisk(b, x, y, event.frame.PlanetRadiusArcsec*scale, true, "overview-planet-outline", event.label)
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}
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if event.label != "C2" && event.label != "C3" {
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writeLocalPlanetOccultationOverviewLabel(b, event, x, y, cx, cy)
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}
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}
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}
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func localPlanetOccultationSVGExtent(frames []moon.PlanetOccultationDiagramFrame) float64 {
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extent := 1.0
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for _, frame := range frames {
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extent = math.Max(extent, frame.MoonRadiusArcsec)
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extent = math.Max(extent, math.Abs(frame.PlanetXArcsec)+frame.PlanetRadiusArcsec)
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extent = math.Max(extent, math.Abs(frame.PlanetYArcsec)+frame.PlanetRadiusArcsec)
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}
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return extent * 1.28
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}
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func localPlanetOccultationSVGMaximumMoonRadius(frames []moon.PlanetOccultationDiagramFrame) float64 {
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radius := 1.0
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for _, frame := range frames {
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radius = math.Max(radius, frame.MoonRadiusArcsec)
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}
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return radius
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}
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func writeLocalPlanetOccultationTrack(
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b *strings.Builder,
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frames []moon.PlanetOccultationDiagramFrame,
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mapX, mapY func(float64) float64,
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) {
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if len(frames) < 2 {
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return
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}
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var path strings.Builder
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for index, frame := range frames {
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command := "L"
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if index == 0 {
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command = "M"
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}
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fmt.Fprintf(&path, "%s %.3f %.3f ", command, mapX(frame.PlanetXArcsec), mapY(frame.PlanetYArcsec))
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}
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fmt.Fprintf(b, `<path class="local-planet-track" d="%s" fill="none" stroke="#9b3f36" stroke-width="1.7" stroke-dasharray="5 4" opacity="0.82" marker-end="url(#local-planet-occultation-arrow)"/>`, strings.TrimSpace(path.String()))
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}
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func writeLocalPlanetOccultationLunarPath(
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b *strings.Builder,
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frames []moon.PlanetOccultationDiagramFrame,
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mapX, mapY func(float64) float64,
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extent float64,
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language string,
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) {
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unitX, unitY, ok := localPlanetOccultationSVGLunarPathDirection(frames)
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if !ok {
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return
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}
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lineExtent := extent * 0.92
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startX := mapX(-unitX * lineExtent)
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startY := mapY(-unitY * lineExtent)
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endX := mapX(unitX * lineExtent)
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endY := mapY(unitY * lineExtent)
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if !starOccultationFinite(startX) || !starOccultationFinite(startY) ||
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!starOccultationFinite(endX) || !starOccultationFinite(endY) {
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return
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}
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fmt.Fprintf(b, `<line class="lunar-path-line" x1="%.3f" y1="%.3f" x2="%.3f" y2="%.3f" stroke="#506975" stroke-width="1.1" stroke-dasharray="7 4" opacity="0.86"/>`,
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startX, startY, endX, endY)
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labelX, labelY := startX, startY
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if endX < startX {
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labelX, labelY = endX, endY
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}
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fmt.Fprintf(b, `<text class="lunar-path-label" x="%.3f" y="%.3f" fill="#405966" stroke="#ffffff" stroke-width="3" paint-order="stroke" font-family="Georgia, 'Times New Roman', serif" font-size="12" text-anchor="end">%s</text>`,
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labelX-6, labelY-6, html.EscapeString(localStarOccultationSVGLunarPathLabel(language)))
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}
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func localPlanetOccultationSVGLunarPathDirection(frames []moon.PlanetOccultationDiagramFrame) (float64, float64, bool) {
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if len(frames) < 2 {
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return 0, 0, false
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}
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greatest := -1
|
|
for index, frame := range frames {
|
|
if localPlanetOccultationSVGFrameHasLabel(frame, "Greatest") {
|
|
greatest = index
|
|
break
|
|
}
|
|
}
|
|
left, right := 0, len(frames)-1
|
|
if greatest > 0 && greatest+1 < len(frames) {
|
|
left, right = greatest-1, greatest+1
|
|
} else if greatest == 0 {
|
|
left, right = 0, 1
|
|
} else if greatest == len(frames)-1 {
|
|
left, right = len(frames)-2, len(frames)-1
|
|
}
|
|
dx := frames[right].PlanetXArcsec - frames[left].PlanetXArcsec
|
|
dy := frames[right].PlanetYArcsec - frames[left].PlanetYArcsec
|
|
length := math.Hypot(dx, dy)
|
|
if !starOccultationFinite(length) || length == 0 {
|
|
return 0, 0, false
|
|
}
|
|
return dx / length, dy / length, true
|
|
}
|
|
|
|
func writeLocalPlanetOccultationDisk(
|
|
b *strings.Builder,
|
|
x, y, radius float64,
|
|
hidden bool,
|
|
class, label string,
|
|
) {
|
|
fill, stroke, dash := "#d6ad69", "#704b2d", ""
|
|
if hidden {
|
|
fill, stroke, dash = "none", "#7d3430", ` stroke-dasharray="2 2"`
|
|
}
|
|
fmt.Fprintf(b, `<circle class="%s" data-label="%s" cx="%.3f" cy="%.3f" r="%.3f" fill="%s" stroke="%s" stroke-width="1.2"%s/>`,
|
|
html.EscapeString(class), html.EscapeString(label), x, y, math.Max(radius, 0.15), fill, stroke, dash)
|
|
}
|
|
|
|
func writeLocalPlanetOccultationOverviewLabel(
|
|
b *strings.Builder,
|
|
event localPlanetOccultationEventFrame,
|
|
x, y, cx, cy float64,
|
|
) {
|
|
dx, dy, anchor := 8.0, -9.0, "start"
|
|
if x > cx {
|
|
dx, anchor = -8, "end"
|
|
}
|
|
if y < cy-20 {
|
|
dy = 15
|
|
}
|
|
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#792d28" stroke="#ffffff" stroke-width="3" paint-order="stroke" font-family="Arial, sans-serif" font-size="11" font-weight="700" text-anchor="%s">%s</text>`,
|
|
x+dx, y+dy, anchor, html.EscapeString(event.name))
|
|
}
|
|
|
|
func writeLocalPlanetOccultationContacts(
|
|
b *strings.Builder,
|
|
events []localPlanetOccultationEventFrame,
|
|
layout localStarOccultationSVGLayout,
|
|
options LocalPlanetOccultationSVGOptions,
|
|
) {
|
|
fmt.Fprintf(b, `<line x1="%.3f" y1="%.3f" x2="%.3f" y2="%.3f" stroke="#d0d3d1" stroke-width="1"/>`,
|
|
layout.panelX-12, layout.overviewTop-12, layout.panelX-12, layout.overviewBottom)
|
|
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#161a1b" font-family="Georgia, 'Times New Roman', serif" font-size="14" font-weight="700">%s</text>`,
|
|
layout.panelX, layout.overviewTop-10, html.EscapeString(localPlanetOccultationSVGContactsTitle(options)))
|
|
available := layout.overviewBottom - layout.overviewTop - 10
|
|
rowHeight := math.Min(66, available/math.Max(1, float64(len(events))))
|
|
for index, event := range events {
|
|
y := layout.overviewTop + 16 + float64(index)*rowHeight
|
|
if index > 0 {
|
|
fmt.Fprintf(b, `<line x1="%.3f" y1="%.3f" x2="%.3f" y2="%.3f" stroke="#e0e1df" stroke-width="0.8"/>`,
|
|
layout.panelX, y-12, layout.panelX+layout.panelWidth, y-12)
|
|
}
|
|
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#1c2528" font-family="Arial, sans-serif" font-size="11" font-weight="700">%s</text>`,
|
|
layout.panelX, y, html.EscapeString(event.name))
|
|
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#1c2528" font-family="Arial, sans-serif" font-size="10" text-anchor="end">%s</text>`,
|
|
layout.panelX+layout.panelWidth, y, html.EscapeString(event.time.In(options.Location).Format("15:04:05.0")))
|
|
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#536063" font-family="Arial, sans-serif" font-size="9.5">PA %.1f° | %s %.1f° | %s %.1f°</text>`,
|
|
layout.panelX, y+16, event.frame.PositionAngleDeg,
|
|
localStarOccultationSVGAltitudeLabel(options.Language), event.frame.MoonAltitudeDeg,
|
|
localStarOccultationSVGAzimuthLabel(options.Language), event.frame.MoonAzimuthDeg)
|
|
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#6b7577" font-family="Arial, sans-serif" font-size="9.5">r %.2f″ | %s</text>`,
|
|
layout.panelX, y+31, event.frame.PlanetRadiusArcsec,
|
|
html.EscapeString(localStarOccultationSVGVisibilityText(event.frame.MoonAltitudeDeg >= 0, options.Language)))
|
|
}
|
|
}
|
|
|
|
func writeLocalPlanetOccultationStages(
|
|
b *strings.Builder,
|
|
events []localPlanetOccultationEventFrame,
|
|
layout localStarOccultationSVGLayout,
|
|
options LocalPlanetOccultationSVGOptions,
|
|
) {
|
|
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#161a1b" font-family="Georgia, 'Times New Roman', serif" font-size="14" font-weight="700">%s</text>`,
|
|
layout.margin, layout.stageTop+13, html.EscapeString(localPlanetOccultationSVGPhasePanelsTitle(options)))
|
|
if len(events) == 0 {
|
|
return
|
|
}
|
|
usableWidth := layout.width - 2*layout.margin
|
|
columnWidth := usableWidth / float64(len(events))
|
|
maxMoonRadius := localPlanetOccultationSVGMaximumMoonRadiusFromEvents(events)
|
|
radius := math.Min(43, math.Max(31, (layout.stageBottom-layout.stageTop-59)/2))
|
|
scale := radius / maxMoonRadius
|
|
cy := layout.stageTop + 35 + radius
|
|
for index, event := range events {
|
|
cx := layout.margin + columnWidth*(float64(index)+0.5)
|
|
trueRadius := event.frame.PlanetRadiusArcsec * scale
|
|
displayRadius := math.Max(trueRadius, 5.5)
|
|
magnification := displayRadius / math.Max(trueRadius, 1e-9)
|
|
x, y := localPlanetOccultationSVGStageCenter(event, cx, cy, radius, displayRadius, scale)
|
|
fmt.Fprintf(b, `<circle class="stage-planet-disk" data-label="%s" data-true-radius="%.3f" data-magnification="%.3f" cx="%.3f" cy="%.3f" r="%.3f" fill="#d6ad69" stroke="#704b2d" stroke-width="1.1"/>`,
|
|
html.EscapeString(event.label), trueRadius, magnification, x, y, displayRadius)
|
|
writeLocalStarOccultationMoon(b, cx, cy, event.frame.MoonRadiusArcsec*scale, "stage-moon")
|
|
if event.hidden {
|
|
fmt.Fprintf(b, `<circle class="stage-planet-hidden-outline" cx="%.3f" cy="%.3f" r="%.3f" fill="none" stroke="#7d3430" stroke-width="1.1" stroke-dasharray="2 2"/>`,
|
|
x, y, displayRadius)
|
|
}
|
|
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#1c2528" font-family="Arial, sans-serif" font-size="10.5" font-weight="700" text-anchor="middle">%s</text>`,
|
|
cx, cy+radius+18, html.EscapeString(event.name))
|
|
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#667174" font-family="Arial, sans-serif" font-size="9.5" text-anchor="middle">%s</text>`,
|
|
cx, cy+radius+32, html.EscapeString(event.time.In(options.Location).Format("15:04:05.0")))
|
|
}
|
|
}
|
|
|
|
// 阶段面板会放大较小的行星盘面以便观察，并在接触时同步移动显示中心，使 C1/C4 仍外切、C2/C3 仍内切。这只影响展示；事件时刻和总览使用未修改的站心几何。
|
|
// The stage panels enlarge small planet disks for visibility and move the display center by the same amount at contacts so C1/C4 remain externally tangent and C2/C3 remain internally tangent. This only affects presentation; event times and the overview use the unmodified topocentric geometry.
|
|
func localPlanetOccultationSVGStageCenter(
|
|
event localPlanetOccultationEventFrame,
|
|
cx, cy, moonRadius, displayRadius, scale float64,
|
|
) (float64, float64) {
|
|
distance := event.frame.SeparationArcsec * scale
|
|
switch event.label {
|
|
case "C1", "C4":
|
|
distance = moonRadius + displayRadius
|
|
case "C2", "C3":
|
|
distance = math.Max(0, moonRadius-displayRadius)
|
|
}
|
|
angle := event.frame.PositionAngleDeg * math.Pi / 180
|
|
return cx - distance*math.Sin(angle), cy - distance*math.Cos(angle)
|
|
}
|
|
|
|
func localPlanetOccultationSVGMaximumMoonRadiusFromEvents(events []localPlanetOccultationEventFrame) float64 {
|
|
radius := 1.0
|
|
for _, event := range events {
|
|
radius = math.Max(radius, event.frame.MoonRadiusArcsec)
|
|
}
|
|
return radius
|
|
}
|
|
|
|
func writeLocalPlanetOccultationFooter(
|
|
b *strings.Builder,
|
|
info moon.PlanetOccultationInfo,
|
|
layout localStarOccultationSVGLayout,
|
|
options LocalPlanetOccultationSVGOptions,
|
|
) {
|
|
directionLines := starOccultationWrapText(localPlanetOccultationSVGDirectionText(options), layout.width-80, 10)
|
|
for index, line := range directionLines {
|
|
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#4f595b" font-family="Georgia, 'Times New Roman', serif" font-size="10">%s</text>`,
|
|
layout.margin, layout.footerY+float64(index)*14-8, html.EscapeString(line))
|
|
}
|
|
footerLines := starOccultationWrapText(localPlanetOccultationSVGFooterNote(info, options), layout.width-80, 9)
|
|
for index, line := range footerLines {
|
|
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#747c7d" font-family="Georgia, 'Times New Roman', serif" font-size="9">%s</text>`,
|
|
layout.margin, layout.footerY+float64(len(directionLines))*14+float64(index)*12-6, html.EscapeString(line))
|
|
}
|
|
}
|
|
|
|
func localPlanetOccultationSVGEventFrames(
|
|
info moon.PlanetOccultationInfo,
|
|
frames []moon.PlanetOccultationDiagramFrame,
|
|
language string,
|
|
) []localPlanetOccultationEventFrame {
|
|
times := map[string]time.Time{
|
|
"C1": info.ExternalImmersion,
|
|
"C2": info.InternalImmersion,
|
|
"Greatest": info.Greatest,
|
|
"C3": info.InternalEmersion,
|
|
"C4": info.ExternalEmersion,
|
|
}
|
|
labels := []string{"C1", "Greatest", "C4"}
|
|
if info.HasInternalContacts {
|
|
labels = []string{"C1", "C2", "Greatest", "C3", "C4"}
|
|
}
|
|
result := make([]localPlanetOccultationEventFrame, 0, len(labels))
|
|
for _, label := range labels {
|
|
for _, frame := range frames {
|
|
if localPlanetOccultationSVGFrameHasLabel(frame, label) {
|
|
hidden := frame.FullyOcculted || info.Type == moon.OccultationTotal &&
|
|
(label == "C2" || label == "Greatest" || label == "C3")
|
|
result = append(result, localPlanetOccultationEventFrame{
|
|
label: label,
|
|
name: localPlanetOccultationSVGEventName(label, language),
|
|
time: times[label],
|
|
hidden: hidden,
|
|
frame: frame,
|
|
})
|
|
break
|
|
}
|
|
}
|
|
}
|
|
return result
|
|
}
|
|
|
|
func localPlanetOccultationSVGFrameHasLabel(frame moon.PlanetOccultationDiagramFrame, label string) bool {
|
|
if frame.Label == label {
|
|
return true
|
|
}
|
|
for _, current := range frame.Labels {
|
|
if current == label {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func localPlanetOccultationSVGHeaderLines(
|
|
info moon.PlanetOccultationInfo,
|
|
options LocalPlanetOccultationSVGOptions,
|
|
) []string {
|
|
lines := make([]string, 0, 4)
|
|
for _, value := range []string{
|
|
localPlanetOccultationSVGSummaryText(info, options),
|
|
localPlanetOccultationSVGGreatestText(info, options),
|
|
} {
|
|
lines = append(lines, starOccultationWrapText(value, float64(options.Width)-80, 13)...)
|
|
}
|
|
return lines
|
|
}
|
|
|
|
func localPlanetOccultationSVGTargetName(
|
|
info moon.PlanetOccultationInfo,
|
|
language string,
|
|
) string {
|
|
target := strings.TrimSpace(info.TargetID)
|
|
if language == starOccultationSVGLanguageChinese && (target == "" || target == info.Planet.String()) {
|
|
return planetOccultationChineseName(info.Planet)
|
|
}
|
|
if target != "" {
|
|
return target
|
|
}
|
|
if language == starOccultationSVGLanguageEnglish {
|
|
return info.Planet.String()
|
|
}
|
|
return "行星"
|
|
}
|
|
|
|
func localPlanetOccultationSVGTitle(
|
|
info moon.PlanetOccultationInfo,
|
|
options LocalPlanetOccultationSVGOptions,
|
|
) string {
|
|
if options.Title != "" {
|
|
return options.Title
|
|
}
|
|
date := info.Greatest.In(options.Location).Format("2006-01-02")
|
|
target := localPlanetOccultationSVGTargetName(info, options.Language)
|
|
if options.Language == starOccultationSVGLanguageEnglish {
|
|
return fmt.Sprintf("%s Local Lunar Occultation of %s", date, target)
|
|
}
|
|
return fmt.Sprintf("%s 指定地点月掩%s", date, target)
|
|
}
|
|
|
|
func localPlanetOccultationSVGSummaryText(
|
|
info moon.PlanetOccultationInfo,
|
|
options LocalPlanetOccultationSVGOptions,
|
|
) string {
|
|
if options.SummaryText != "" {
|
|
return options.SummaryText
|
|
}
|
|
coordinates := starOccultationFormatCoordinates(info.Observer.Longitude, info.Observer.Latitude)
|
|
duration := localStarOccultationSVGFormatDuration(info.ExternalEmersion.Sub(info.ExternalImmersion), options.Language)
|
|
if options.Language == starOccultationSVGLanguageEnglish {
|
|
return fmt.Sprintf("Site %s | elevation %.0f m | %s | C1-C4 duration %s", coordinates, info.Observer.Height,
|
|
localPlanetOccultationSVGTypeName(info.Type, options.Language), duration)
|
|
}
|
|
return fmt.Sprintf("观测点 %s | 海拔 %.0f 米 | %s | C1-C4 历时 %s", coordinates, info.Observer.Height,
|
|
localPlanetOccultationSVGTypeName(info.Type, options.Language), duration)
|
|
}
|
|
|
|
func localPlanetOccultationSVGGreatestText(
|
|
info moon.PlanetOccultationInfo,
|
|
options LocalPlanetOccultationSVGOptions,
|
|
) string {
|
|
if options.GreatestText != "" {
|
|
return options.GreatestText
|
|
}
|
|
value := info.Greatest.In(options.Location)
|
|
zone := starOccultationLocationLabel(value, options.Location)
|
|
if options.Language == starOccultationSVGLanguageEnglish {
|
|
return fmt.Sprintf("Greatest %s %s | separation %.2f arcsec | radii Moon %.2f / planet %.2f arcsec | Moon altitude %+.1f°",
|
|
value.Format("2006-01-02 15:04:05.0"), zone, info.MinimumSeparationArcsec,
|
|
info.MoonSemidiameterArcsec, info.PlanetSemidiameterArcsec, info.MoonAltitudeAtGreatest)
|
|
}
|
|
return fmt.Sprintf("掩甚 %s %s | 中心角距 %.2f 角秒 | 视半径 月 %.2f / 行星 %.2f 角秒 | 月球高度 %+.1f°",
|
|
value.Format("2006-01-02 15:04:05.0"), zone, info.MinimumSeparationArcsec,
|
|
info.MoonSemidiameterArcsec, info.PlanetSemidiameterArcsec, info.MoonAltitudeAtGreatest)
|
|
}
|
|
|
|
func localPlanetOccultationSVGOverviewTitle(options LocalPlanetOccultationSVGOptions) string {
|
|
if options.OverviewTitle != "" {
|
|
return options.OverviewTitle
|
|
}
|
|
if options.Language == starOccultationSVGLanguageEnglish {
|
|
return "Topocentric planet track (true disk scale)"
|
|
}
|
|
return "站心行星轨迹（圆盘真实比例）"
|
|
}
|
|
|
|
func localPlanetOccultationSVGPhasePanelsTitle(options LocalPlanetOccultationSVGOptions) string {
|
|
if options.PhasePanelsTitle != "" {
|
|
return options.PhasePanelsTitle
|
|
}
|
|
if options.Language == starOccultationSVGLanguageEnglish {
|
|
return "C1-C4 contact stages (planet disk enlarged)"
|
|
}
|
|
return "C1-C4 接触阶段（行星圆盘放大示意）"
|
|
}
|
|
|
|
func localPlanetOccultationSVGContactsTitle(options LocalPlanetOccultationSVGOptions) string {
|
|
if options.ContactsTitle != "" {
|
|
return options.ContactsTitle
|
|
}
|
|
if options.Language == starOccultationSVGLanguageEnglish {
|
|
return "Local contacts"
|
|
}
|
|
return "本地接触时刻"
|
|
}
|
|
|
|
func localPlanetOccultationSVGDirectionText(options LocalPlanetOccultationSVGOptions) string {
|
|
if options.DirectionText != "" {
|
|
return options.DirectionText
|
|
}
|
|
if options.Language == starOccultationSVGLanguageEnglish {
|
|
return "Moon fixed at center; east is left and north is up. Blue-gray dashed: local lunar path. Red dashed: planet-center track."
|
|
}
|
|
return "月球固定在中心；图上左东右西，向上为北。灰蓝虚线为掩甚附近的站心白道，红色虚线为行星中心相对月心轨迹。"
|
|
}
|
|
|
|
func localPlanetOccultationSVGFooterNote(
|
|
info moon.PlanetOccultationInfo,
|
|
options LocalPlanetOccultationSVGOptions,
|
|
) string {
|
|
if options.FooterNote != "" {
|
|
return options.FooterNote
|
|
}
|
|
ringNote := ""
|
|
if info.Planet == moon.OccultationSaturn {
|
|
if options.Language == starOccultationSVGLanguageEnglish {
|
|
ringNote = " Saturn's rings are excluded from contact calculation and drawing."
|
|
} else {
|
|
ringNote = "土星环不参与接触计算，也不作为圆盘边界绘制。"
|
|
}
|
|
}
|
|
if options.Language == starOccultationSVGLanguageEnglish {
|
|
return "C1/C4 are external contacts; C2/C3 are internal contacts. Stage disks are enlarged for visibility; contact times use true topocentric radii." + ringNote
|
|
}
|
|
return "C1/C4 为外切，C2/C3 为内切。阶段图中的行星圆盘为可见性放大，接触时刻按真实站心视半径求解。" + ringNote
|
|
}
|
|
|
|
func localPlanetOccultationSVGEventName(label, language string) string {
|
|
if language == starOccultationSVGLanguageEnglish {
|
|
switch label {
|
|
case "C1":
|
|
return "C1 external ingress"
|
|
case "C2":
|
|
return "C2 internal ingress"
|
|
case "Greatest":
|
|
return "Greatest"
|
|
case "C3":
|
|
return "C3 internal egress"
|
|
case "C4":
|
|
return "C4 external egress"
|
|
}
|
|
}
|
|
switch label {
|
|
case "C1":
|
|
return "C1 外切始"
|
|
case "C2":
|
|
return "C2 内切始"
|
|
case "Greatest":
|
|
return "掩甚"
|
|
case "C3":
|
|
return "C3 内切终"
|
|
case "C4":
|
|
return "C4 外切终"
|
|
default:
|
|
return label
|
|
}
|
|
}
|
|
|
|
func localPlanetOccultationSVGTypeName(eventType moon.OccultationType, language string) string {
|
|
if language == starOccultationSVGLanguageEnglish {
|
|
switch eventType {
|
|
case moon.OccultationTotal:
|
|
return "total occultation"
|
|
case moon.OccultationPartial:
|
|
return "partial occultation"
|
|
default:
|
|
return "grazing occultation"
|
|
}
|
|
}
|
|
switch eventType {
|
|
case moon.OccultationTotal:
|
|
return "行星圆面全掩"
|
|
case moon.OccultationPartial:
|
|
return "行星圆面部分掩"
|
|
default:
|
|
return "行星圆面擦边"
|
|
}
|
|
}
|