2011.10.19（2）——— android 圆角与倒影

2011.10.19（2）——— android 圆角与倒影

我只是把代码下了，忘了在呢看到了，对不住作者了

主要包含了 放大缩小 圆角图片 和 倒影

package com.lp.imageUI;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.Drawable;
public class ImageUtil {
	
	//放大缩小图片
	public static Bitmap zoomBitmap(Bitmap bitmap,int w,int h){
		int width = bitmap.getWidth();
		int height = bitmap.getHeight();
		Matrix matrix = new Matrix();
		float scaleWidht = ((float)w / width);
    	float scaleHeight = ((float)h / height);
    	matrix.postScale(scaleWidht, scaleHeight);
    	Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
		return newbmp;
	}
	//将Drawable转化为Bitmap
	 public static Bitmap drawableToBitmap(Drawable drawable){
	    	int width = drawable.getIntrinsicWidth();
	    	int height = drawable.getIntrinsicHeight();
	    	Bitmap bitmap = Bitmap.createBitmap(width, height,
	    			drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
	                        : Bitmap.Config.RGB_565);
	    	Canvas canvas = new Canvas(bitmap);
	    	drawable.setBounds(0,0,width,height);
	    	drawable.draw(canvas);
	    	return bitmap;
	    	
	    }
	 
	 //获得圆角图片的方法
	public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){
		
		Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
				.getHeight(), Config.ARGB_8888);
		Canvas canvas = new Canvas(output);
 
		final int color = 0xff424242;
		final Paint paint = new Paint();
		final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
		final RectF rectF = new RectF(rect);
 
		paint.setAntiAlias(true);
		canvas.drawARGB(0, 0, 0, 0);
		paint.setColor(color);
		/**
		 * 画一个圆角矩形
		 * rectF: 矩形
		 * roundPx 圆角在x轴上或y轴上的半径
		 */
		canvas.drawRoundRect(rectF, roundPx, roundPx+10, paint);
		//设置两张图片相交时的模式
		//setXfermode前的是 dst 之后的是src
		//在正常的情况下，在已有的图像上绘图将会在其上面添加一层新的形状。 
		//如果新的Paint是完全不透明的，那么它将完全遮挡住下面的Paint；
		//PorterDuffXfermode就可以来解决这个问题
		//canvas原有的图片 可以理解为背景 就是dst
		//新画上去的图片 可以理解为前景 就是src
//		paint.setXfermode(new PorterDuffXfermode(Mode.SRC_OUT));
		paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
		canvas.drawBitmap(bitmap, rect, rect, paint);
 
		return output;
	}
	//获得带倒影的图片方法
	public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap){
		// 图片与倒影间隔距离  
		final int reflectionGap = 4;
		// 图片的宽度  
		int width = bitmap.getWidth();
		 // 图片的高度  
		int height = bitmap.getHeight();
		
		Matrix matrix = new Matrix();
		// 图片缩放，x轴变为原来的1倍，y轴为-1倍,实现图片的反转
		matrix.preScale(1, -1);
		// 创建反转后的图片Bitmap对象，图片高是原图的一半。  
		Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 
				0, height/2, width, height/2, matrix, false);
		// 创建标准的Bitmap对象，宽和原图一致，高是原图的1.5倍。 可以理解为这张图将会在屏幕上显示 是原图和倒影的合体  
		Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888);
		 // 构造函数传入Bitmap对象，为了在图片上画图  
		Canvas canvas = new Canvas(bitmapWithReflection);
		// 画原始图片  
		canvas.drawBitmap(bitmap, 0, 0, null);
		// 画间隔矩形  
		Paint deafalutPaint = new Paint();
		canvas.drawRect(0, height,width,height + reflectionGap,
				deafalutPaint);
		// 画倒影图片  
		canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
		// 实现倒影渐变效果  
		Paint paint = new Paint();
		LinearGradient shader = new LinearGradient(0,
				bitmap.getHeight(), 0, bitmapWithReflection.getHeight()
				+ reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
		paint.setShader(shader);
		
		// Set the Transfer mode to be porter duff and destination in
		// 覆盖效果  
		paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
		// Draw a rectangle using the paint with our linear gradient
		canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
				+ reflectionGap, paint);
 
		return bitmapWithReflection;
	}
	
}

圆角和倒影的效果如图：