b612
2bf8478639
- 新增日月食中心带、偏食带、阴影足迹、等时线、食分线及升落边界计算，支持极区与混合食拓扑 - 新增日食单时刻阴影求解器、站心状态查询、批量采样和 ΔT 覆盖接口 - 重构恒星与行星月掩路径，补充有限盘面接触、站心修正、掩带宽度、极区投影及升落边界 - 扩展 SVG 与 GeoJSON 输出，支持详细面板、全球/极区/地球投影、边界闭合、时间标记和拓扑签名 - 扩展日月食候选搜索、局地搜索、沙罗序列预计算与范围外推，补充系列锚点和成员一致性校验 - 补齐古历纪年、儒略历独有闰日、多公历候选、历法改革跨日及精确日期运算接口 - 优化 ΔT、章动、恒星时、月球地平线、事件根搜索和本地星历缓存，降低重复计算开销并提升边界稳定
576 lines
21 KiB
Go
576 lines
21 KiB
Go
package svg
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import (
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"encoding/xml"
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"errors"
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"io"
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"math"
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"strconv"
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"strings"
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"testing"
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"time"
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"b612.me/astro/moon"
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)
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func TestFindPlanetOccultationSVGsSaturnFiniteDisk(t *testing.T) {
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diagrams, err := FindPlanetOccultationSVGs(
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time.Date(2024, time.August, 20, 0, 0, 0, 0, time.UTC),
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time.Date(2024, time.August, 22, 0, 0, 0, 0, time.UTC),
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moon.OccultationSaturn,
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moon.OccultationPathOptions{Step: 5 * time.Minute, TargetSpacingKM: 200},
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PlanetOccultationSVGOptions{Width: 720, Height: 520},
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)
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if err != nil {
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t.Fatalf("FindPlanetOccultationSVGs() error = %v", err)
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}
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if len(diagrams) != 1 {
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t.Fatalf("FindPlanetOccultationSVGs() returned %d diagrams, want 1", len(diagrams))
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}
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diagram := diagrams[0]
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for _, want := range []string{
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`<svg`, `width="720"`, `height="520"`, "2024-08-21", "土星",
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"全球掩带", "外掩始", "全掩始", "掩甚", "全掩终", "外掩终", "外切锥面", "内切锥面",
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"部分掩带", "全掩带", `class="occultation-band"`, `class="total-occultation-band"`,
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`fill-rule="nonzero"`, `class="center-line"`,
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`class="occultation-time-marker"`,
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`class="event-marker event-total-start"`, `class="event-marker event-greatest"`,
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`class="event-marker event-total-end"`, `class="event-marker-leader"`,
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`class="occultation-rise-set-boundary occultation-start-rise"`, `stroke="#d97706"`, "初掩/掩甚/终掩月升月落线",
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} {
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if !strings.Contains(diagram, want) {
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t.Fatalf("planetary SVG missing %q", want)
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}
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}
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for _, obsolete := range []string{
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`class="northern-limit"`, `class="southern-limit"`,
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`class="northern-total-limit"`, `class="southern-total-limit"`,
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} {
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if strings.Contains(diagram, obsolete) {
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t.Fatalf("planetary footprint sweep retains obsolete approximate line %q", obsolete)
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}
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}
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if strings.Contains(diagram, "月掩Saturn") {
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t.Fatal("Chinese planetary SVG title contains the English default target name")
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}
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if err := validateXML(diagram); err != nil {
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t.Fatalf("generated planetary SVG is not valid XML: %v", err)
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}
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for _, pair := range [][2]string{{"外掩始", "全掩始"}, {"全掩终", "外掩终"}} {
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_, firstY := planetOccultationSVGTextPosition(t, diagram, pair[0])
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_, secondY := planetOccultationSVGTextPosition(t, diagram, pair[1])
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if math.Abs(firstY-secondY) < 13 {
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t.Fatalf("planetary SVG labels %q and %q overlap vertically at y %.3f / %.3f", pair[0], pair[1], firstY, secondY)
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}
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}
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if got := strings.Count(diagram, `class="event-marker-leader"`); got != 4 {
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t.Fatalf("planetary SVG close-contact leader count = %d, want 4", got)
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}
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if got := strings.Count(diagram, `fill="#087f8c" stroke="#ffffff" stroke-width="1.0"`); got < 2 {
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t.Fatalf("planetary SVG total-contact marker count = %d, want at least 2", got)
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}
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bandIndex := strings.Index(diagram, `class="occultation-band"`)
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curveIndex := strings.Index(diagram, `class="occultation-rise-set-boundary occultation-start-rise"`)
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if bandIndex < 0 || curveIndex < 0 || curveIndex < bandIndex {
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t.Fatalf("planetary SVG draws rise/set curves before the filled band: band=%d curve=%d", bandIndex, curveIndex)
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}
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curveEnd := -1
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if curveIndex >= 0 {
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curveEnd = strings.Index(diagram[curveIndex:], "/>")
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}
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if curveEnd < 0 || strings.Contains(diagram[curveIndex:curveIndex+curveEnd], "stroke-dasharray") {
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t.Fatal("planetary rise/set phase line is rendered with a gap-producing dash pattern")
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}
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}
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func TestPlanetOccultationLegendOmitsDisabledRiseSetCurves(t *testing.T) {
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path := samplePlanetOccultationPath()
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path.RiseSetCurves = nil
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diagram, err := PlanetOccultationPathSVG(path, PlanetOccultationSVGOptions{})
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if err != nil {
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t.Fatalf("PlanetOccultationPathSVG: %v", err)
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}
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if strings.Contains(diagram, "初掩/掩甚/终掩月升月落线") || strings.Contains(diagram, "Rise/set phase lines") {
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t.Fatal("planetary SVG legend claims disabled rise/set curves are present")
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}
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}
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func TestPlanetOccultationSVGWithoutFootprintsUsesLimitBands(t *testing.T) {
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path := samplePlanetOccultationPath()
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path.PartialFootprints = nil
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path.TotalFootprints = nil
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diagram, err := PlanetOccultationPathSVG(path, PlanetOccultationSVGOptions{})
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if err != nil {
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t.Fatalf("PlanetOccultationPathSVG: %v", err)
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}
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for _, className := range []string{
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`class="occultation-band"`, `class="total-occultation-band"`,
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`class="northern-limit"`, `class="southern-limit"`,
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`class="northern-total-limit"`, `class="southern-total-limit"`,
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} {
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if !strings.Contains(diagram, className) {
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t.Fatalf("planetary SVG without footprints is missing %s", className)
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}
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}
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}
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func TestPlanetOccultationSVG20240725UsesCompactBandFootprints(t *testing.T) {
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zone := time.FixedZone("UTC+8", 8*60*60)
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start := time.Date(2024, time.July, 25, 0, 0, 0, 0, zone)
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paths, err := moon.FindPlanetOccultationPaths(
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start, start.Add(24*time.Hour), moon.OccultationSaturn,
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moon.OccultationPathOptions{
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Step: 20 * time.Minute, TargetSpacingKM: 900,
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DisableRiseSet: true, DisableFootprints: true,
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},
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)
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if err != nil || len(paths) != 1 {
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t.Fatalf("FindPlanetOccultationPaths() paths=%d err=%v, want one", len(paths), err)
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}
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path := paths[0]
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if len(path.PartialFootprints) != 0 || len(path.TotalFootprints) != 0 ||
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len(path.PartialBandFootprints) == 0 || len(path.TotalBandFootprints) == 0 {
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t.Fatalf("dense/compact footprint counts partial=%d/%d total=%d/%d",
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len(path.PartialFootprints), len(path.PartialBandFootprints),
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len(path.TotalFootprints), len(path.TotalBandFootprints))
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}
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diagram, err := PlanetOccultationPathSVG(path, PlanetOccultationSVGOptions{
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Width: 1200, Height: 800, Projection: MapProjectionEquirectangular,
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})
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if err != nil {
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t.Fatalf("PlanetOccultationPathSVG: %v", err)
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}
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for _, className := range []string{
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`class="northern-limit"`, `class="southern-limit"`,
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`class="northern-total-limit"`, `class="southern-total-limit"`,
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} {
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if strings.Contains(diagram, className) {
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t.Fatalf("compact planetary SVG still overlays discontinuous auxiliary line %s", className)
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}
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}
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x, y := planetOccultationSVGMapPoint(
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t, diagram, MapProjectionEquirectangular, path.Greatest.Longitude, path.Greatest.Latitude,
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)
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for _, className := range []string{`class="occultation-band"`, `class="total-occultation-band"`} {
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pathData := planetOccultationSVGPathData(t, diagram, strings.TrimSuffix(strings.TrimPrefix(className, `class="`), `"`))
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if !strings.Contains(pathData, "Z") {
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t.Fatalf("compact planetary SVG %s is not explicitly closed", className)
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}
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if !planetOccultationSVGPathContains(pathData, x, y) {
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t.Fatalf("compact planetary SVG %s excludes greatest at %.3f, %.3f", className, x, y)
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}
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}
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}
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func TestPlanetOccultationSVGMars20250729MergesTotalRiseSetBoundaryBand(t *testing.T) {
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zone := time.FixedZone("UTC+8", 8*60*60)
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start := time.Date(2025, time.July, 29, 0, 0, 0, 0, zone)
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paths, err := moon.FindPlanetOccultationPaths(
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start, start.Add(24*time.Hour), moon.OccultationMars,
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moon.OccultationPathOptions{
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Step: 20 * time.Minute, TargetSpacingKM: 900, RiseSetStep: time.Minute,
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DisableFootprints: true, IncludeFootprintTimeline: true,
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FootprintTimelineStep: 5 * time.Minute,
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},
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)
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if err != nil || len(paths) != 1 {
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t.Fatalf("FindPlanetOccultationPaths() paths=%d err=%v, want one", len(paths), err)
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}
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path := paths[0]
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if len(path.TotalBandFootprints) < 20 {
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t.Fatalf("total compact footprint count=%d, want sparse support samples", len(path.TotalBandFootprints))
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}
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if len(path.TotalRiseSetCurves) == 0 {
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t.Fatal("total compact band is missing inner-contact rise/set curves")
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}
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diagram, err := PlanetOccultationPathSVG(path, PlanetOccultationSVGOptions{
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Width: 1200, Height: 800, Projection: MapProjectionEquirectangular,
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})
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if err != nil {
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t.Fatalf("PlanetOccultationPathSVG: %v", err)
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}
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pathData := planetOccultationSVGPathData(t, diagram, "total-occultation-band")
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subpaths := strings.Count(pathData, "M ")
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if subpaths >= len(path.TotalBandFootprints)/2 {
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t.Fatalf("Mars 2025-07-29 total band has %d subpaths for %d compact footprints, want merged boundary geometry",
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subpaths, len(path.TotalBandFootprints))
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}
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if !strings.Contains(pathData, "Z") {
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t.Fatal("Mars 2025-07-29 total boundary band is not explicitly closed")
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}
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}
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func TestPlanetOccultationPathSVGJupiter20230517PolarBandContainsPole(t *testing.T) {
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start := time.Date(2023, time.May, 17, 0, 0, 0, 0, time.UTC)
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paths, err := moon.FindPlanetOccultationPaths(
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start, start.Add(24*time.Hour), moon.OccultationJupiter,
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moon.OccultationPathOptions{Step: 5 * time.Minute, TargetSpacingKM: 200},
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)
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if err != nil || len(paths) != 1 {
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t.Fatalf("FindPlanetOccultationPaths() paths=%d err=%v, want one Jupiter path", len(paths), err)
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}
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for _, projection := range []struct {
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name string
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value MapProjection
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longitude, latitude float64
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}{
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{name: "north-polar", value: MapProjectionNorthPolar, longitude: 0, latitude: 90},
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{name: "equirectangular", value: MapProjectionEquirectangular, longitude: 0, latitude: 89},
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} {
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diagram, renderErr := PlanetOccultationPathSVG(paths[0], PlanetOccultationSVGOptions{
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Width: 1200, Height: 800, Projection: projection.value,
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})
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if renderErr != nil {
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t.Fatalf("%s PlanetOccultationPathSVG() error = %v", projection.name, renderErr)
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}
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x, y := planetOccultationSVGMapPoint(t, diagram, projection.value, projection.longitude, projection.latitude)
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for _, className := range []string{"occultation-band", "total-occultation-band"} {
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pathData := planetOccultationSVGPathData(t, diagram, className)
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if !planetOccultationSVGPathContains(pathData, x, y) {
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t.Fatalf("%s %s does not contain %.1f°E %.1f°N at %.3f, %.3f", projection.name, className,
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projection.longitude, projection.latitude, x, y)
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}
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}
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}
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}
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func TestPlanetOccultationPathSVGJupiter20230517UsesFineFootprintSweep(t *testing.T) {
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start := time.Date(2023, time.May, 17, 0, 0, 0, 0, time.UTC)
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paths, err := moon.FindPlanetOccultationPaths(
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start, start.Add(24*time.Hour), moon.OccultationJupiter,
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moon.OccultationPathOptions{Step: 5 * time.Minute, TargetSpacingKM: 200},
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)
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if err != nil || len(paths) != 1 {
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t.Fatalf("FindPlanetOccultationPaths() paths=%d err=%v, want one Jupiter path", len(paths), err)
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}
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path := paths[0]
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for _, series := range []struct {
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name string
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footprints []moon.PlanetOccultationFootprint
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}{
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{name: "partial", footprints: path.PartialFootprints},
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{name: "total", footprints: path.TotalFootprints},
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} {
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if len(series.footprints) < 100 {
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t.Fatalf("%s footprint count = %d, want fine sweep sampling", series.name, len(series.footprints))
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}
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for index := 1; index < len(series.footprints); index++ {
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gap := series.footprints[index].Time.Sub(series.footprints[index-1].Time)
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if gap > time.Minute+time.Millisecond {
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t.Fatalf("%s footprint gap at %d = %s, want at most one minute", series.name, index, gap)
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}
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}
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}
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}
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func planetOccultationSVGMapCenter(t *testing.T, diagram string) (float64, float64) {
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t.Helper()
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attributes := planetOccultationSVGElementAttributes(t, diagram, "circle", "map-ocean")
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return planetOccultationSVGFloatAttribute(t, attributes, "cx"),
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planetOccultationSVGFloatAttribute(t, attributes, "cy")
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}
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func planetOccultationSVGMapPoint(
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t *testing.T, diagram string, projection MapProjection, longitude, latitude float64,
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) (float64, float64) {
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t.Helper()
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if projection == MapProjectionNorthPolar || projection == MapProjectionSouthPolar {
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return planetOccultationSVGMapCenter(t, diagram)
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}
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attributes := planetOccultationSVGElementAttributes(t, diagram, "rect", "map-ocean")
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x := planetOccultationSVGFloatAttribute(t, attributes, "x")
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y := planetOccultationSVGFloatAttribute(t, attributes, "y")
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width := planetOccultationSVGFloatAttribute(t, attributes, "width")
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height := planetOccultationSVGFloatAttribute(t, attributes, "height")
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return x + (longitude+180)/360*width, y + (90-latitude)/180*height
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}
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func planetOccultationSVGPathData(t testing.TB, diagram, className string) string {
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t.Helper()
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attributes := planetOccultationSVGElementAttributes(t, diagram, "path", className)
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value, ok := attributes["d"]
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if !ok {
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t.Fatalf("SVG path %q has no d attribute", className)
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}
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return value
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}
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func planetOccultationSVGElementAttributes(
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t testing.TB,
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diagram, elementName, className string,
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) map[string]string {
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t.Helper()
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decoder := xml.NewDecoder(strings.NewReader(diagram))
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for {
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token, err := decoder.Token()
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if err == io.EOF {
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break
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}
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if err != nil {
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t.Fatalf("decode planetary SVG: %v", err)
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}
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start, ok := token.(xml.StartElement)
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if !ok || start.Name.Local != elementName {
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continue
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}
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attributes := make(map[string]string, len(start.Attr))
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for _, attribute := range start.Attr {
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attributes[attribute.Name.Local] = attribute.Value
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}
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if attributes["class"] == className {
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return attributes
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}
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}
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t.Fatalf("SVG element %s.%s not found", elementName, className)
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return nil
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}
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func planetOccultationSVGFloatAttribute(t testing.TB, attributes map[string]string, name string) float64 {
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t.Helper()
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value, ok := attributes[name]
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if !ok {
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t.Fatalf("SVG element has no %s attribute", name)
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}
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parsed, err := strconv.ParseFloat(value, 64)
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if err != nil {
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t.Fatalf("parse SVG %s attribute %q: %v", name, value, err)
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}
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return parsed
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}
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func planetOccultationSVGPathContains(pathData string, x, y float64) bool {
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fields := strings.Fields(pathData)
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polygon := make([][2]float64, 0)
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for index := 0; index < len(fields); {
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switch fields[index] {
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case "M", "L":
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if index+2 >= len(fields) {
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return false
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}
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pointX, xErr := strconv.ParseFloat(fields[index+1], 64)
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pointY, yErr := strconv.ParseFloat(fields[index+2], 64)
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if xErr != nil || yErr != nil {
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return false
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}
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polygon = append(polygon, [2]float64{pointX, pointY})
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index += 3
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case "Z":
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if planetOccultationSVGPolygonContains(polygon, x, y) {
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return true
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}
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polygon = polygon[:0]
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index++
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default:
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return false
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}
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}
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return false
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}
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func planetOccultationSVGPolygonContains(polygon [][2]float64, x, y float64) bool {
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inside := false
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for current, previous := 0, len(polygon)-1; current < len(polygon); previous, current = current, current+1 {
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a, b := polygon[previous], polygon[current]
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if (a[1] > y) == (b[1] > y) {
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continue
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}
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if a[0]+(y-a[1])*(b[0]-a[0])/(b[1]-a[1]) > x {
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inside = !inside
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}
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}
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return inside
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}
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func TestPlanetOccultationPathSVGWrapsFivePhaseSummaryAtRenderedFontSize(t *testing.T) {
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path := samplePlanetOccultationPath()
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options := normalizeStarOccultationSVGOptions(PlanetOccultationSVGOptions{
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Width: 1100,
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SummaryText: strings.Repeat("A", 130),
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})
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options = planetOccultationSVGDefaults(path, options)
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lines := starOccultationSVGHeaderLines(planetOccultationStarShape(path, path.TargetID), options, starOccultationSVGTextFlags(options))
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if len(lines) < 3 {
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t.Fatalf("planetary SVG header lines = %d, want wrapped summary plus greatest line", len(lines))
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}
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if width := starOccultationTextWidth(lines[0], 14); width > float64(options.Width)-80 {
|
|
t.Fatalf("planetary SVG first header line width = %.1f, canvas allowance %.1f", width, float64(options.Width)-80)
|
|
}
|
|
}
|
|
|
|
func TestPlanetOccultationPathSVGUsesLargeGlobalMapDefault(t *testing.T) {
|
|
diagram, err := PlanetOccultationPathSVG(samplePlanetOccultationPath(), PlanetOccultationSVGOptions{})
|
|
if err != nil {
|
|
t.Fatalf("PlanetOccultationPathSVG() error = %v", err)
|
|
}
|
|
for _, want := range []string{
|
|
`width="1200" height="800"`,
|
|
`preserveAspectRatio="xMidYMid meet"`,
|
|
`style="max-width:100%;height:auto;display:block"`,
|
|
} {
|
|
if !strings.Contains(diagram, want) {
|
|
t.Fatalf("planetary SVG missing large responsive canvas marker %q", want)
|
|
}
|
|
}
|
|
}
|
|
|
|
func planetOccultationSVGTextPosition(t *testing.T, diagram, label string) (float64, float64) {
|
|
t.Helper()
|
|
decoder := xml.NewDecoder(strings.NewReader(diagram))
|
|
for {
|
|
token, err := decoder.Token()
|
|
if err == io.EOF {
|
|
break
|
|
}
|
|
if err != nil {
|
|
t.Fatalf("decode planetary SVG: %v", err)
|
|
}
|
|
start, ok := token.(xml.StartElement)
|
|
if !ok || start.Name.Local != "text" {
|
|
continue
|
|
}
|
|
var text string
|
|
if err := decoder.DecodeElement(&text, &start); err != nil {
|
|
t.Fatalf("decode planetary SVG text: %v", err)
|
|
}
|
|
if text != label {
|
|
continue
|
|
}
|
|
values := map[string]float64{}
|
|
for _, attribute := range start.Attr {
|
|
if attribute.Name.Local != "x" && attribute.Name.Local != "y" {
|
|
continue
|
|
}
|
|
value, parseErr := strconv.ParseFloat(attribute.Value, 64)
|
|
if parseErr != nil {
|
|
t.Fatalf("parse %s coordinate %q: %v", attribute.Name.Local, attribute.Value, parseErr)
|
|
}
|
|
values[attribute.Name.Local] = value
|
|
}
|
|
return values["x"], values["y"]
|
|
}
|
|
t.Fatalf("planetary SVG label %q not found", label)
|
|
return 0, 0
|
|
}
|
|
|
|
func TestPlanetOccultationPathSVGRejectsInvalidCanvasWithPlanetError(t *testing.T) {
|
|
path := samplePlanetOccultationPath()
|
|
_, err := PlanetOccultationPathSVG(path, PlanetOccultationSVGOptions{Width: 1})
|
|
if !errors.Is(err, ErrInvalidPlanetOccultationSVGOptions) {
|
|
t.Fatalf("PlanetOccultationPathSVG() error = %v, want ErrInvalidPlanetOccultationSVGOptions", err)
|
|
}
|
|
}
|
|
|
|
func TestPlanetOccultationPathSVGEnglishAndCustomText(t *testing.T) {
|
|
diagram, err := PlanetOccultationPathSVG(samplePlanetOccultationPath(), PlanetOccultationSVGOptions{
|
|
Language: "en",
|
|
Location: time.UTC,
|
|
Title: "Custom planetary occultation",
|
|
SummaryText: "Custom summary",
|
|
GreatestText: "Custom greatest",
|
|
FooterNote: "Custom footer",
|
|
})
|
|
if err != nil {
|
|
t.Fatalf("PlanetOccultationPathSVG() error = %v", err)
|
|
}
|
|
for _, want := range []string{
|
|
"Custom planetary occultation", "Custom summary", "Custom greatest", "Custom footer",
|
|
"Partial begins", "Total begins", "Greatest", "Total ends", "Partial ends",
|
|
} {
|
|
if !strings.Contains(diagram, want) {
|
|
t.Fatalf("English planetary SVG missing %q", want)
|
|
}
|
|
}
|
|
if err := validateXML(diagram); err != nil {
|
|
t.Fatalf("English planetary SVG is not valid XML: %v", err)
|
|
}
|
|
}
|
|
|
|
func TestPlanetOccultationPathSVGRejectsInvalidPath(t *testing.T) {
|
|
_, err := PlanetOccultationPathSVG(moon.PlanetOccultationPath{Planet: moon.OccultationSaturn}, PlanetOccultationSVGOptions{})
|
|
if !errors.Is(err, ErrInvalidPlanetOccultationPath) {
|
|
t.Fatalf("PlanetOccultationPathSVG() error = %v, want ErrInvalidPlanetOccultationPath", err)
|
|
}
|
|
path := samplePlanetOccultationPath()
|
|
path.TotalComplete = false
|
|
_, err = PlanetOccultationPathSVG(path, PlanetOccultationSVGOptions{})
|
|
if !errors.Is(err, ErrInvalidPlanetOccultationPath) {
|
|
t.Fatalf("incomplete total band error = %v, want ErrInvalidPlanetOccultationPath", err)
|
|
}
|
|
}
|
|
|
|
func TestPlanetOccultationPathSVGRejectsMalformedRiseSetCurve(t *testing.T) {
|
|
path := samplePlanetOccultationPath()
|
|
curve := sampleOccultationRiseSetCurve(path.Start.Time)
|
|
curve.Direction = moon.RiseSetDirection("bogus")
|
|
path.RiseSetCurves = []moon.OccultationRiseSetCurve{curve}
|
|
_, err := PlanetOccultationPathSVG(path, PlanetOccultationSVGOptions{})
|
|
if !errors.Is(err, ErrInvalidPlanetOccultationPath) {
|
|
t.Fatalf("PlanetOccultationPathSVG() error = %v, want ErrInvalidPlanetOccultationPath", err)
|
|
}
|
|
}
|
|
|
|
func TestPlanetOccultationPathSVGSupportsPartialOnlyGlobalBand(t *testing.T) {
|
|
path := samplePlanetOccultationPath()
|
|
path.HasTotalBand = false
|
|
path.TotalStart = moon.OccultationPathPoint{}
|
|
path.TotalEnd = moon.OccultationPathPoint{}
|
|
path.TotalComplete = false
|
|
path.NorthernTotalLimit = nil
|
|
path.SouthernTotalLimit = nil
|
|
path.GreatestTotalWidthKM = 0
|
|
diagram, err := PlanetOccultationPathSVG(path, PlanetOccultationSVGOptions{})
|
|
if err != nil {
|
|
t.Fatalf("PlanetOccultationPathSVG() partial-only error = %v", err)
|
|
}
|
|
if !strings.Contains(diagram, "部分掩带") || strings.Contains(diagram, `class="total-occultation-band"`) ||
|
|
strings.Contains(diagram, "全掩始") || strings.Contains(diagram, "全掩终") {
|
|
t.Fatal("partial-only planetary SVG contains inconsistent total-band content")
|
|
}
|
|
if got := strings.Count(diagram, `class="event-marker `); got != 3 {
|
|
t.Fatalf("partial-only global marker count = %d, want 3", got)
|
|
}
|
|
}
|
|
|
|
func samplePlanetOccultationPath() moon.PlanetOccultationPath {
|
|
starPath := sampleStarOccultationPath()
|
|
totalStart := starOccultationInterpolatePathPoint(
|
|
starPath.CenterLine[0], starPath.CenterLine[1], 0.5, 167.5,
|
|
)
|
|
totalEnd := starOccultationInterpolatePathPoint(
|
|
starPath.CenterLine[2], starPath.CenterLine[3], 0.5, -167.5,
|
|
)
|
|
northernTotal := []moon.OccultationPathPoint{totalStart}
|
|
southernTotal := []moon.OccultationPathPoint{totalStart}
|
|
for _, point := range starPath.CenterLine[1:3] {
|
|
north, south := point, point
|
|
north.Latitude += 10
|
|
south.Latitude -= 10
|
|
north.WidthKM = 0
|
|
south.WidthKM = 0
|
|
northernTotal = append(northernTotal, north)
|
|
southernTotal = append(southernTotal, south)
|
|
}
|
|
northernTotal = append(northernTotal, totalEnd)
|
|
southernTotal = append(southernTotal, totalEnd)
|
|
return moon.PlanetOccultationPath{
|
|
Planet: moon.OccultationSaturn,
|
|
TargetID: "Saturn",
|
|
Start: starPath.Start,
|
|
Greatest: starPath.Greatest,
|
|
End: starPath.End,
|
|
Complete: true,
|
|
CenterLine: starPath.CenterLine,
|
|
NorthernLimit: starPath.NorthernLimit,
|
|
SouthernLimit: starPath.SouthernLimit,
|
|
HasTotalBand: true,
|
|
TotalStart: totalStart,
|
|
TotalEnd: totalEnd,
|
|
TotalComplete: true,
|
|
NorthernTotalLimit: northernTotal,
|
|
SouthernTotalLimit: southernTotal,
|
|
GreatestTotalWidthKM: 3100,
|
|
Step: starPath.Step,
|
|
TargetSpacingKM: starPath.TargetSpacingKM,
|
|
}
|
|
}
|