add an cbitmap example [#169]

examples/cbitmap/main.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"github.com/go-vgo/robotgo"
+)
+
+func main() {
+	bmp, free := loadBitmaps("start.png", "chest.png", "eat.png")
+	defer free()
+
+	for {
+		clickBitmap(bmp["start.png"], false)
+		clickBitmap(bmp["chest.png"], true)
+		clickBitmap(bmp["eat.png"], false)
+	}
+}
+
+func loadBitmaps(files ...string) (bitmaps map[string]robotgo.Bitmap, free func()) {
+	freeFuncs := make([]func(), 0)
+	bitmaps = make(map[string]robotgo.Bitmap)
+	for _, f := range files {
+		bitmap, freeFunc := readBitmap(f)
+		bitmaps[f] = bitmap
+		freeFuncs = append(freeFuncs, freeFunc)
+	}
+
+	free = func() {
+		for key := range freeFuncs {
+			freeFuncs[key]()
+		}
+	}
+	return bitmaps, free
+}
+
+func readBitmap(file string) (bitmap robotgo.Bitmap, free func()) {
+	cBitmap := robotgo.OpenBitmap(file)
+	bitmap = robotgo.ToBitmap(cBitmap)
+	free = func() {
+		robotgo.FreeBitmap(cBitmap)
+	}
+	return bitmap, free
+}
+
+func clickBitmap(bmp robotgo.Bitmap, doubleClick bool) bool {
+	fx, fy := robotgo.FindBitmap(robotgo.ToCBitmap(bmp))
+	if fx != -1 && fy != -1 {
+		robotgo.MoveMouse(fx, fy)
+		robotgo.MouseClick("left", doubleClick)
+		return true
+	}
+
+	return false
+}