Ilia Denisov
94 lines
2.2 KiB
Go
94 lines
2.2 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 TestCircles_WrapCopies_AppearInsideViewportWhenViewportEqualsWorld(t *testing.T) {
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t.Parallel()
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// World 10x10 units => 10px at zoom=1 when viewport==world.
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w := NewWorld(10, 10)
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w.resetGrid(2 * SCALE)
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type tc struct {
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name string
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x, y float64
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r float64
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wantCenters [][2]float64 // expected (cx,cy) in canvas px for zoom=1, worldRect min = 0
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}
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// Camera is centered => expanded world rect equals [0..W)x[0..H) when margin=0.
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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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}
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tests := []tc{
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{
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name: "bottom boundary wraps to top",
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x: 5, y: 9, r: 2,
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// Centers: original at y=9, copy at y=-1.
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wantCenters: [][2]float64{{5, 9}, {5, -1}},
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},
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{
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name: "right boundary wraps to left",
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x: 9, y: 5, r: 2,
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wantCenters: [][2]float64{{9, 5}, {-1, 5}},
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},
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{
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name: "corner wraps to three extra copies",
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x: 9, y: 9, r: 2,
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wantCenters: [][2]float64{{9, 9}, {-1, 9}, {9, -1}, {-1, -1}},
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},
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{
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name: "no wrap inside",
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x: 5, y: 5, r: 2,
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wantCenters: [][2]float64{{5, 5}},
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},
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}
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for _, tt := range tests {
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tt := tt
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t.Run(tt.name, func(t *testing.T) {
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t.Parallel()
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w2 := NewWorld(10, 10)
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w2.resetGrid(2 * SCALE)
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_, err := w2.AddCircle(tt.x, tt.y, tt.r)
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require.NoError(t, err)
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for _, obj := range w2.objects {
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w2.indexObject(obj)
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}
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plan, err := w2.buildRenderPlanStageA(params)
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require.NoError(t, err)
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d := &fakePrimitiveDrawer{}
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drawCirclesFromPlan(d, plan, w2.W, w2.H)
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cmds := d.CommandsByName("AddCircle")
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require.Len(t, cmds, len(tt.wantCenters))
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// Collect centers (ignore radius for this test).
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got := make([][2]float64, 0, len(cmds))
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for _, c := range cmds {
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require.Len(t, c.Args, 3)
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got = append(got, [2]float64{c.Args[0], c.Args[1]})
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}
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// Order is deterministic with our shift generation and tile iteration for margin=0: single tile.
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require.ElementsMatch(t, tt.wantCenters, got)
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})
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}
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}
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