完善功能

graphics/file.go

@@ -0,0 +1,32 @@
+package graphics
+
+import (
+	"image"
+	"os"
+	"path/filepath"
+	"strings"
+	"image/jpeg"
+	"image/png"
+	"image/gif"
+)
+// 将图片保存到指定的路径
+func SaveImage(p string, src image.Image) error {
+
+	f, err := os.OpenFile( p, os.O_SYNC | os.O_RDWR | os.O_CREATE, 0666)
+
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	ext := filepath.Ext(p)
+
+	if strings.EqualFold(ext, ".jpg") || strings.EqualFold(ext, ".jpeg") {
+
+		err = jpeg.Encode(f, src, &jpeg.Options{Quality : 100 })
+	} else if strings.EqualFold(ext, ".png") {
+		err = png.Encode(f, src)
+	} else if strings.EqualFold(ext, ".gif") {
+		err = gif.Encode(f, src, &gif.Options{NumColors : 256})
+	}
+	return err
+}