// Draw a tiger
func Draw(gc draw2d.GraphicContext, filename string) {
// Open the postscript
src, err := os.OpenFile(filename, 0, 0)
if err != nil {
panic(err)
}
defer src.Close()
bytes, err := ioutil.ReadAll(src)
reader := strings.NewReader(string(bytes))
// Initialize and interpret the postscript
interpreter := ps.NewInterpreter(gc)
interpreter.Execute(reader)
}
func display() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
lastTime := time.Now()
gl.LineWidth(1)
gc := draw2dgl.NewGraphicContext(width, height)
gc.Translate(380, 400)
gc.Scale(1, -1)
rotate = (rotate + 1) % 360
gc.Rotate(float64(rotate) * math.Pi / 180)
gc.Translate(-380, -400)
interpreter := ps.NewInterpreter(gc)
reader := strings.NewReader(postscriptContent)
interpreter.Execute(reader)
dt := time.Now().Sub(lastTime)
log.Printf("Redraw in : %f ms\n", float64(dt)*1e-6)
gl.Flush() /* Single buffered, so needs a flush. */
}