add sample: postscript

samples/postscript/postscript.go

@@ -0,0 +1,49 @@
+// Package postscript reads the tiger.ps file and draws it to a backend.
+package postscript
+
+import (
+	"io/ioutil"
+	"os"
+	"strings"
+
+	"github.com/llgcode/ps"
+
+	"github.com/llgcode/draw2d"
+	"github.com/llgcode/draw2d/samples"
+)
+
+// 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
+}
+
+// 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)
+}