// Draw the image frame with certain parameters.
func Draw(gc draw2d.GraphicContext, png string,
dw, dh, margin, lineWidth float64) error {
// Draw frame
draw2dkit.RoundedRectangle(gc, lineWidth, lineWidth, dw-lineWidth, dh-lineWidth, 100, 100)
gc.SetLineWidth(lineWidth)
gc.FillStroke()
// load the source image
source, err := draw2dimg.LoadFromPngFile(png)
if err != nil {
return err
}
// Size of source image
sw, sh := float64(source.Bounds().Dx()), float64(source.Bounds().Dy())
// Draw image to fit in the frame
// TODO Seems to have a transform bug here on draw image
scale := math.Min((dw-margin*2)/sw, (dh-margin*2)/sh)
gc.Save()
gc.Translate((dw-sw*scale)/2, (dh-sh*scale)/2)
gc.Scale(scale, scale)
gc.Rotate(0.2)
gc.DrawImage(source)
gc.Restore()
return nil
}
// Main draws a left hand and ear of a gopher. Afterwards it returns
// the filename. This should only be used during testing.
func Main(gc draw2d.GraphicContext, ext string) (string, error) {
gc.Save()
gc.Scale(0.5, 0.5)
// Draw a (partial) gopher
Draw(gc)
gc.Restore()
// Return the output filename
return samples.Output("gopher", ext), nil
}
// PathTransform scales a path differently in horizontal and vertical direction.
func PathTransform(gc draw2d.GraphicContext, x, y, width, height float64) {
gc.Save()
gc.SetLineWidth(width / 10)
gc.Translate(x+width/2, y+height/2)
gc.Scale(1, 4)
gc.ArcTo(0, 0, width/8, height/8, 0, math.Pi*2)
gc.Close()
gc.Stroke()
gc.Restore()
}
// Main draws the tiger
func Main(gc draw2d.GraphicContext, ext string) (string, error) {
gc.Save()
// flip the image
gc.Translate(0, 200)
gc.Scale(0.35, -0.35)
gc.Translate(70, -200)
// Tiger postscript drawing
tiger := samples.Resource("image", "tiger.ps", ext)
// Draw tiger
Draw(gc, tiger)
gc.Restore()
// Return the output filename
return samples.Output("postscript", ext), nil
}