crunchy-rocks/draw2d
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Use transformer.Transform.

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This commit is contained in:
Chris Rhodes 2016-01-02 11:05:47 -08:00
parent 001a24bc17
commit 11b6fa221b
1 changed files with 6 additions and 10 deletions
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16
draw2dimg/ftgc.go
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@ -18,6 +18,7 @@ import (
"golang.org/x/image/draw"
"golang.org/x/image/font"
"golang.org/x/image/math/f64"
"golang.org/x/image/math/fixed"
)
@ -98,21 +99,16 @@ func (gc *GraphicContext) ClearRect(x1, y1, x2, y2 int) {
// DrawImage draws an image into dest using an affine transformation matrix, an op and a filter
func DrawImage(src image.Image, dest draw.Image, tr draw2d.Matrix, op draw.Op, filter ImageFilter) {
srcRect := src.Bounds()
x0, y0, x1, y1 := tr.TransformRectangle(float64(srcRect.Min.X), float64(srcRect.Min.Y), float64(srcRect.Max.X), float64(srcRect.Max.Y))
destRect := image.Rectangle{image.Point{int(x0), int(y0)}, image.Point{int(x1), int(y1)}}
var scaler draw.Scaler
var transformer draw.Transformer
switch filter {
case LinearFilter:
scaler = draw.NearestNeighbor
transformer = draw.NearestNeighbor
case BilinearFilter:
scaler = draw.BiLinear
transformer = draw.BiLinear
case BicubicFilter:
scaler = draw.CatmullRom
transformer = draw.CatmullRom
}
scaler.Scale(dest, destRect, src, srcRect, draw.Over, nil)
transformer.Transform(dest, f64.Aff3{tr[0], tr[1], tr[4], tr[2], tr[3], tr[5]}, src, src.Bounds(), draw.Over, nil)
}
// DrawImage draws the raster image in the current canvas