Android实现图片的倒影效果
16lz
2021-01-23
效果如下:
主要代码如下:
public static Bitmap createReflectedImage(Bitmap originalImage) { final int reflectionGap = 4; int width = originalImage.getWidth(); int height = originalImage.getHeight(); Matrix matrix = new Matrix(); matrix.preScale(1, -1); Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, height / 2, width, height / 2, matrix, false); Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888); Canvas canvas = new Canvas(bitmapWithReflection); canvas.drawBitmap(originalImage, 0, 0, null); Paint defaultPaint = new Paint(); canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint); canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null); Paint paint = new Paint(); LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0×70ffffff, 0×00ffffff, TileMode.MIRROR); paint.setShader(shader); paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint); return bitmapWithReflection; }
解释一下:
Matrix matrix = new Matrix(); matrix.preScale(1, -1);
实现图片的反转,见Android利用Matrix简单处理图片。
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, height / 2, width, height / 2, matrix, false);
创建反转后的图片Bitmap对象,图片高是原图的一半。
Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888);
创建标准的Bitmap对象,宽和原图一致,高是原图的1.5倍。
Canvas canvas = new Canvas(bitmapWithReflection);canvas.drawBitmap(originalImage, 0, 0, null);
创建画布对象,将原图画于画布,起点是原点位置。
Paint defaultPaint = new Paint(); canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
将反转后的图片画到画布中。
LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0×70ffffff, 0×00ffffff,
创建线性渐变LinearGradient 对象。
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);
画布画出反转图片大小区域,然后把渐变效果加到其中,就出现了图片的倒影效果。
附件:http://www.oschina.net/code/snippet_157182_8946
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