/
postscript.go
49 lines (39 loc) · 1000 Bytes
/
postscript.go
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// Package postscript reads the tiger.ps file and draws it to a backend.
package postscript
import (
"io"
"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 := io.ReadAll(src)
reader := strings.NewReader(string(bytes))
// Initialize and interpret the postscript
interpreter := ps.NewInterpreter(gc)
interpreter.Execute(reader)
}