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Form1Impl.go
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Form1Impl.go
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// 在这里写你的事件
package main
import (
"fmt"
"runtime"
"github.com/energye/golcl/lcl/bitmap"
"github.com/fogleman/gg"
"github.com/energye/golcl/lcl"
)
//::private::
type TForm1Fields struct {
drawFunds map[string]func()
bufBmp *lcl.TBitmap
}
// 使用gg 2d图形库来绘制,最终显示到govcl控件上。
// gg部分的代码来自gg的例子
// https://github.com/fogleman/gg
func (f *TForm1) OnFormCreate(sender lcl.IObject) {
f.ScreenCenter()
f.bufBmp = lcl.NewBitmap()
f.drawFunds = map[string]func(){
"ggDrawLines": f.ggDrawLines,
"ggDrawEllipse": f.ggDrawEllipse,
"ggDrawGradientLinear": f.ggDrawGradientLinear,
"ggDrawGradientRadial": f.ggDrawGradientRadial,
"ggDrawBeziers": f.ggDrawBeziers,
"ggDrawCircle": f.ggDrawCircle,
"ggDrawCrisp": f.ggDrawCrisp,
"ggDrawCubic": f.ggDrawCubic,
"ggDrawFont": f.ggDrawFont,
"ggDrawGradientText": f.ggDrawGradientText,
"ggDrawInvertMask": f.ggDrawInvertMask,
"ggDrawLineWidth": f.ggDrawLineWidth,
"ggDrawLorem": f.ggDrawLorem,
"ggDrawRotatedText": f.ggDrawRotatedText,
"ggDrawRotatedImage": f.ggDrawRotatedImage,
"ggDrawWarpText": f.ggDrawWarpText,
"ggDrawStar": f.ggDrawStar,
"ggDrawStars": f.ggDrawStars,
}
}
func (f *TForm1) OnFormDestroy(sender lcl.IObject) {
if f.bufBmp != nil && f.bufBmp.IsValid() {
f.bufBmp.Free()
}
}
func (f *TForm1) ggImageToBitmap(dc *gg.Context) error {
err := bitmap.ToBitmap2(dc.Image(), f.bufBmp)
if err != nil {
return err
}
return nil
}
func (f *TForm1) ggImageToPng(dc *gg.Context) *lcl.TPngImage {
obj, err := bitmap.ToPngImage(dc.Image())
if err != nil {
return nil
}
return obj
}
func (f *TForm1) ggDrawImage(dc *gg.Context) {
// linux跟macOS下有些效果不太好,所以用png,具体原因还待分析。
if runtime.GOOS != "windows" {
pngObj := f.ggImageToPng(dc)
if pngObj != nil {
defer pngObj.Free()
f.Canvas().Draw(0, 0, pngObj)
}
} else {
if f.ggImageToBitmap(dc) == nil {
f.Canvas().Draw(0, 0, f.bufBmp)
}
}
}
func (f *TForm1) OnFormPaint(sender lcl.IObject) {
if f.ListBox1.ItemIndex() == -1 {
return
}
fn, ok := f.drawFunds[f.ListBox1.Items().Strings(f.ListBox1.ItemIndex())]
if !ok {
fmt.Println("没有找到指定的滤镜。")
return
}
fn()
}
func (f *TForm1) OnListBox1Click(sender lcl.IObject) {
f.Repaint()
}