IliaDenisov
70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
package world
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import (
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestTorusShortestLineSegments_TieCaseIsDeterministicAndSplits(t *testing.T) {
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t.Parallel()
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// World 10 units => 10000 fixed.
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worldW := 10 * SCALE
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worldH := 10 * SCALE
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// Tie-case along X: 1 -> 6 is exactly half world apart (dx = +5000).
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// Deterministic rule chooses negative delta representation (wrap is applied).
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l := Line{
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X1: 1 * SCALE, Y1: 5 * SCALE,
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X2: 6 * SCALE, Y2: 5 * SCALE,
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}
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segs := torusShortestLineSegments(l, worldW, worldH)
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// Expect two horizontal segments:
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// [6000..10000] and [0..1000] at y=5000.
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require.Len(t, segs, 2)
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// Direction is deterministic and follows the chosen negative-delta representation.
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require.Equal(t, lineSeg{x1: 1000, y1: 5000, x2: 0, y2: 5000}, segs[0])
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require.Equal(t, lineSeg{x1: 10000, y1: 5000, x2: 6000, y2: 5000}, segs[1])
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}
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func TestLines_NoWrap_TieCaseDoesNotWrap(t *testing.T) {
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t.Parallel()
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w := NewWorld(10, 10)
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w.resetGrid(2 * SCALE)
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// Tie-case along X: 1 -> 6 in world of 10.
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_, err := w.AddLine(1, 5, 6, 5)
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require.NoError(t, err)
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for _, obj := range w.objects {
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w.indexObject(obj)
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}
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params := RenderParams{
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ViewportWidthPx: 10,
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ViewportHeightPx: 10,
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MarginXPx: 0,
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MarginYPx: 0,
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CameraXWorldFp: 5 * SCALE,
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CameraYWorldFp: 5 * SCALE,
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CameraZoom: 1.0,
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Options: &RenderOptions{
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DisableWrapScroll: true,
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Layers: []RenderLayer{RenderLayerLines},
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},
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}
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d := &fakePrimitiveDrawer{}
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require.NoError(t, w.Render(d, params))
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lines := d.CommandsByName("AddLine")
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require.Len(t, lines, 1)
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// At zoom=1 and margin=0, world==canvas, so pixels equal world units.
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require.Equal(t, []float64{1, 5, 6, 5}, lines[0].Args)
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}
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