获取图片倒影效果

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 1 /**
 2      * 获取传入图片的倒影
 3      * 
 4      * @param originalImage 原始图片
 5      * @param reflectionGap 原始图片与倒影图片的间距
 6      * @param percentage     倒影是原图的高度的百分比 . 0< percentage < 1 
 7      * @param onlyReflect      true, 只返回倒影图片，倒影有蒙板效果; 
 8      *                         false, 返回原图 + 间距 + 倒影(从上到下的顺序), 间距和倒影都有蒙板效果
 9      * @return Bitmap;
10      */
11     public static Bitmap createReflectionImageWithOrigin(Bitmap originalImage, int reflectionGap, float percentage, boolean onlyReflect){ 
12         
13         int width = originalImage.getWidth(); 
14         int height = originalImage.getHeight(); 
15         int preHeight = (int)(height * percentage); 
16         
17         Matrix matrix = new Matrix(); 
18         matrix.preScale(1, -1); // 图片矩阵变换（从低部向顶部的倒影）
19 
20         Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, (height - preHeight), width, preHeight, matrix, false); // 截取原图下半部分
21 
22         Bitmap reflectionBitmp = Bitmap.createBitmap(width, preHeight, Config.ARGB_8888);
23         
24         Canvas canvas = new Canvas(reflectionBitmp);// 绘制倒影图 
25         Paint defaultPaint = new Paint();
26         canvas.drawRect(0, height / 5, width, height / 5, defaultPaint);
27         canvas.drawBitmap(reflectionImage, 0, 0, null);
28         
29         //给倒影图片添加遮罩效果
30         Paint paint = new Paint(); 
31         LinearGradient shader = new LinearGradient(0, 0, 0, reflectionBitmp.getHeight(), 0x70ffffff, 0x00ffffff, TileMode.CLAMP); 
32         paint.setShader(shader); // 线性渐变效果
33         paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); // 倒影遮罩效果
34         canvas.drawRect(0, 0, width, reflectionBitmp.getHeight(), paint); // 绘制倒影的阴影效果
35         
36         Bitmap tempReflectionBitmap = reflectionBitmp;
37         
38         if (! onlyReflect) {
39             tempReflectionBitmap = Bitmap.createBitmap(width, (height + preHeight), Config.ARGB_8888); // 创建倒影图片
40             canvas = new Canvas(tempReflectionBitmap);// 绘制倒影图（原图 + 间距 + 倒影） 
41             canvas.drawBitmap(originalImage, 0, 0, null); // 绘制原图
42             canvas.drawRect(0, height,width,height + reflectionGap, defaultPaint);  // 绘制原图与倒影的间距
43             canvas.drawRect(0, height, width, height + reflectionGap, paint); // 绘制间距的阴影效果
44             canvas.drawBitmap(reflectionBitmp, 0, height + reflectionGap, null); // 绘制倒影图
45         }
46         
47         return tempReflectionBitmap; 
48     }