52 lines
1.9 KiB
Go
52 lines
1.9 KiB
Go
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package svgmap
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import (
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"math"
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"strings"
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"testing"
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)
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func TestPolarProjectionPlacesPoleAtCenterAndEquatorOnFrame(t *testing.T) {
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frame := Frame{X: 10, Y: 20, Width: 300, Height: 300, Projection: ProjectionNorthPolar}
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x, y, ok := frame.Project(123, 90)
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if !ok || math.Abs(x-160) > 1e-9 || math.Abs(y-170) > 1e-9 {
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t.Fatalf("north pole = %.3f %.3f %v, want map center", x, y, ok)
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}
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x, y, ok = frame.Project(0, 0)
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if !ok || math.Abs(x-160) > 1e-9 || math.Abs(y-20) > 1e-9 {
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t.Fatalf("prime-meridian equator = %.3f %.3f %v, want top edge", x, y, ok)
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}
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if _, _, ok := frame.Project(0, -1); ok {
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t.Fatal("north-polar projection accepted a southern-hemisphere point")
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}
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}
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func TestProjectionClippingDoesNotSplitPolarAntimeridian(t *testing.T) {
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points := []GeoPoint{{Longitude: 170, Latitude: 70}, {Longitude: -170, Latitude: 70}}
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segments := PolylineSegments(points, ProjectionNorthPolar)
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if len(segments) != 1 || len(segments[0]) != 2 {
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t.Fatalf("polar antimeridian segments = %#v, want one continuous segment", segments)
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}
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segments = PolylineSegments(points, ProjectionEquirectangular)
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if len(segments) != 2 {
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t.Fatalf("equirectangular antimeridian segment count = %d, want 2", len(segments))
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}
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}
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func TestNaturalEarthAssetsAndPolarClip(t *testing.T) {
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if len(equirectangularLandPath) < 150000 || len(northPolarLandPath) < 100000 || len(southPolarLandPath) < 40000 {
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t.Fatalf("unexpected embedded map sizes: world=%d north=%d south=%d",
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len(equirectangularLandPath), len(northPolarLandPath), len(southPolarLandPath))
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}
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frame := Frame{Width: 300, Height: 300, Projection: ProjectionSouthPolar}
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var builder strings.Builder
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frame.WriteOcean(&builder)
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frame.WriteLand(&builder, "clip")
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frame.WriteFrame(&builder)
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for _, want := range []string{`class="map-ocean"`, `class="land"`, `class="map-frame"`, `<circle`} {
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if !strings.Contains(builder.String(), want) {
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t.Fatalf("polar map output missing %q", want)
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}
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}
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}
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