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graphics: Add explanation to SourceRect

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Hajime Hoshi 2018-03-11 21:33:55 +09:00
parent 96402c11a2
commit ee7ef75b8b
1 changed files with 10 additions and 0 deletions
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10
image.go
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@ -308,6 +308,16 @@ type DrawImageOptions struct {
// If SourceRect is nil, whole image is used. // If SourceRect is nil, whole image is used.
// //
// It is assured that texels out of the SourceRect are never used. // It is assured that texels out of the SourceRect are never used.
//
// Calling DrawImage copies the content of SourceRect pointer. This means that
// even if the SourceRect value is modified after passed to DrawImage,
// the result of DrawImage doen't change.
//
// op := &ebiten.DrawImageOptions{}
// r := image.Rect(0, 0, 100, 100)
// op.SourceRect = &r
// dst.DrawImage(src, op)
// r.Min.X = 10 // This doesn't affect the previous DrawImage.
SourceRect *image.Rectangle SourceRect *image.Rectangle
// GeoM is a geometry matrix to draw. // GeoM is a geometry matrix to draw.