draw2d/cmd/testimage.go

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package main
import (
"fmt"
"log"
"os"
"bufio"
"math"
"image"
"time"
"image/png"
"draw2d.googlecode.com/hg/draw2d"
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)
func saveToPngFile(filePath string, m image.Image) {
f, err := os.Open(filePath, os.O_CREAT|os.O_WRONLY, 0600)
if err != nil {
log.Println(err)
os.Exit(1)
}
defer f.Close()
b := bufio.NewWriter(f)
err = png.Encode(b, m)
if err != nil {
log.Println(err)
os.Exit(1)
}
err = b.Flush()
if err != nil {
log.Println(err)
os.Exit(1)
}
fmt.Printf("Wrote %s OK.\n", filePath)
}
func loadFromPngFile(filePath string) image.Image {
f, err := os.Open(filePath, 0, 0)
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if f == nil {
log.Printf("can't open file; err=%s\n", err.String())
return nil
}
defer f.Close()
b := bufio.NewReader(f)
i, err := png.Decode(b)
if err != nil {
log.Println(err)
os.Exit(1)
}
fmt.Printf("Read %s OK.\n", filePath)
return i
}
func testBubble(gc draw2d.GraphicContext) {
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gc.BeginPath()
gc.MoveTo(75, 25)
gc.QuadCurveTo(25, 25, 25, 62.5)
gc.QuadCurveTo(25, 100, 50, 100)
gc.QuadCurveTo(50, 120, 30, 125)
gc.QuadCurveTo(60, 120, 65, 100)
gc.QuadCurveTo(125, 100, 125, 62.5)
gc.QuadCurveTo(125, 25, 75, 25)
gc.Stroke()
}
func main() {
source := loadFromPngFile("../resource/image/Varna_Railway_Station_HDR.png")
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i := image.NewRGBA(1024, 768)
gc := draw2d.NewImageGraphicContext(i)
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gc.Scale(2, 0.5)
//gc.Translate(75, 25)
gc.Rotate(30 * math.Pi / 180)
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lastTime := time.Nanoseconds()
gc.DrawImage(source)
dt := time.Nanoseconds() - lastTime
fmt.Printf("Draw image: %f ms\n", float64(dt)*1e-6)
saveToPngFile("../resource/result/TestDrawImage.png", i)
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}