73 lines
1.6 KiB
Go
73 lines
1.6 KiB
Go
// +build appengine
|
|
|
|
// Package gae demonstrates draw2d on a Google appengine server.
|
|
package gae
|
|
|
|
import (
|
|
"fmt"
|
|
"image"
|
|
"image/png"
|
|
"net/http"
|
|
|
|
"git.fromouter.space/crunchy-rocks/draw2d/draw2dimg"
|
|
"git.fromouter.space/crunchy-rocks/draw2d/draw2dpdf"
|
|
"git.fromouter.space/crunchy-rocks/draw2d/samples/android"
|
|
|
|
"appengine"
|
|
)
|
|
|
|
type appError struct {
|
|
Error error
|
|
Message string
|
|
Code int
|
|
}
|
|
|
|
type appHandler func(http.ResponseWriter, *http.Request) *appError
|
|
|
|
func (fn appHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
if e := fn(w, r); e != nil { // e is *appError, not os.Error.
|
|
c := appengine.NewContext(r)
|
|
c.Errorf("%v", e.Error)
|
|
http.Error(w, e.Message, e.Code)
|
|
}
|
|
}
|
|
|
|
func init() {
|
|
http.Handle("/pdf", appHandler(pdf))
|
|
http.Handle("/png", appHandler(imgPng))
|
|
}
|
|
|
|
func pdf(w http.ResponseWriter, r *http.Request) *appError {
|
|
w.Header().Set("Content-type", "application/pdf")
|
|
|
|
// Initialize the graphic context on an pdf document
|
|
dest := draw2dpdf.NewPdf("L", "mm", "A4")
|
|
gc := draw2dpdf.NewGraphicContext(dest)
|
|
|
|
// Draw sample
|
|
android.Draw(gc, 65, 0)
|
|
|
|
err := dest.Output(w)
|
|
if err != nil {
|
|
return &appError{err, fmt.Sprintf("Can't write: %s", err), 500}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func imgPng(w http.ResponseWriter, r *http.Request) *appError {
|
|
w.Header().Set("Content-type", "image/png")
|
|
|
|
// Initialize the graphic context on an RGBA image
|
|
dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
|
|
gc := draw2dimg.NewGraphicContext(dest)
|
|
|
|
// Draw sample
|
|
android.Draw(gc, 65, 0)
|
|
|
|
err := png.Encode(w, dest)
|
|
if err != nil {
|
|
return &appError{err, fmt.Sprintf("Can't encode: %s", err), 500}
|
|
}
|
|
|
|
return nil
|
|
}
|