50 lines
1,011 B
Go
50 lines
1,011 B
Go
|
// 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)
|
||
|
|
}
|