72 lines
1.4 KiB
Go
72 lines
1.4 KiB
Go
package main
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import (
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"fmt"
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"log"
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"os"
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"bufio"
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"math"
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"image"
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"time"
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"image/png"
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"exp/draw"
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"draw2d.googlecode.com/hg/draw2d"
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)
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func saveToPngFile(filePath string, m image.Image) {
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f, err := os.Create(filePath)
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if err != nil {
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log.Println(err)
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return
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}
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defer f.Close()
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b := bufio.NewWriter(f)
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err = png.Encode(b, m)
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if err != nil {
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log.Println(err)
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return
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}
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err = b.Flush()
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if err != nil {
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log.Println(err)
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return
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}
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fmt.Printf("Wrote %s OK.\n", filePath)
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}
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func loadFromPngFile(filePath string) image.Image {
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f, err := os.OpenFile(filePath, 0, 0)
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if f == nil {
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log.Printf("can't open file; err=%s\n", err.String())
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return nil
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}
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defer f.Close()
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b := bufio.NewReader(f)
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i, err := png.Decode(b)
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if err != nil {
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log.Println(err)
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os.Exit(1)
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}
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fmt.Printf("Read %s OK.\n", filePath)
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return i
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}
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func main() {
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source := loadFromPngFile("../resource/image/TestAndroid.png")
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dest := image.NewRGBA(1024, 768)
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width, height := float64(source.Bounds().Dx()), float64(source.Bounds().Dy())
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tr := draw2d.NewIdentityMatrix()
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tr.Translate(width/2, height/2)
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tr.Rotate(30 * math.Pi / 180)
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//tr.Scale(3, 3)
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tr.Translate(-width/2, -height/2)
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tr.Translate(200, 5)
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lastTime := time.Nanoseconds()
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draw2d.DrawImage(source, dest, tr, draw.Over, draw2d.BilinearFilter)
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dt := time.Nanoseconds() - lastTime
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fmt.Printf("Draw image: %f ms\n", float64(dt)*1e-6)
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saveToPngFile("../resource/result/TestDrawImage.png", dest)
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}
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