IliaDenisov
41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
package world
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import (
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"image/color"
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"testing"
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"github.com/fogleman/gg"
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"github.com/stretchr/testify/require"
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)
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func TestGGDrawer_ClearRectTo_DoesNotAffectStrokeState(t *testing.T) {
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t.Parallel()
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dc := gg.NewContext(40, 20)
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d := &GGDrawer{DC: dc}
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// Fill background to white.
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d.ClearAllTo(color.RGBA{R: 255, G: 255, B: 255, A: 255})
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// Configure stroke to red and draw first line.
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d.SetStrokeColor(color.RGBA{R: 255, A: 255})
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d.SetLineWidth(2)
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d.AddLine(2, 5, 38, 5)
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d.Stroke()
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// Clear a rect in the middle with gray (must not affect stroke state).
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d.ClearRectTo(10, 0, 20, 20, color.RGBA{R: 200, G: 200, B: 200, A: 255})
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// Draw second line WITHOUT reapplying stroke style; it must still be red.
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d.AddLine(2, 15, 38, 15)
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d.Stroke()
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img := dc.Image()
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// Sample a pixel from the second line (y ~15). We expect red channel dominates.
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r, g, b, a := img.At(20, 15).RGBA()
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require.Greater(t, a, uint32(0), "pixel must not be fully transparent")
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require.Greater(t, r, g, "expected red-ish pixel after ClearRectTo")
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require.Greater(t, r, b, "expected red-ish pixel after ClearRectTo")
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}
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