Ilia Denisov
51 lines
968 B
Go
51 lines
968 B
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 TestPivotZoom_CursorAtCenter_KeepsCamera(t *testing.T) {
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t.Parallel()
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cx, cy := PivotZoomCameraNoWrap(
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50*SCALE, 60*SCALE,
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100, 80,
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50, 40, // cursor at center
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SCALE, 2*SCALE,
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)
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require.Equal(t, 50*SCALE, cx)
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require.Equal(t, 60*SCALE, cy)
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}
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func TestPivotZoom_RightEdge_ZoomInMovesCameraRight(t *testing.T) {
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t.Parallel()
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// viewport 100px, cursor at x=100 (right edge), center is 50 => offX=50px
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// zoom 1->2 halves worldPerPx, so camera must move towards the cursor to keep the same world point.
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cx0 := 50 * SCALE
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cx, _ := PivotZoomCameraNoWrap(
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cx0, 50*SCALE,
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100, 100,
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100, 50,
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SCALE, 2*SCALE,
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)
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require.Greater(t, cx, cx0)
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}
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func TestPivotZoom_LeftEdge_ZoomInMovesCameraLeft(t *testing.T) {
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t.Parallel()
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cx0 := 50 * SCALE
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cx, _ := PivotZoomCameraNoWrap(
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cx0, 50*SCALE,
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100, 100,
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0, 50,
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SCALE, 2*SCALE,
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)
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require.Less(t, cx, cx0)
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}
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