Android 颜色渲染(四) BitmapShader位图渲染
Android 颜色处理(四) BitmapShader位图渲染
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package com.tony.shader;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapShader;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Shader;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.ShapeDrawable;import android.graphics.drawable.shapes.OvalShape;import android.util.AttributeSet;import android.view.View;public class BitmapShaderView extends View {private BitmapShader bitmapShader = null;private Bitmap bitmap = null;private Paint paint = null;private ShapeDrawable shapeDrawable = null;private int BitmapWidth = 0;private int BitmapHeight = 0;public BitmapShaderView(Context context) {super(context);// 得到图像bitmap = ((BitmapDrawable) getResources().getDrawable(R.drawable.cat)).getBitmap();BitmapWidth = bitmap.getWidth();BitmapHeight = bitmap.getHeight();// 构造渲染器BitmapShaderbitmapShader = new BitmapShader(bitmap, Shader.TileMode.MIRROR,Shader.TileMode.REPEAT);}public BitmapShaderView(Context context,AttributeSet set) {super(context, set);}@Overrideprotected void onDraw(Canvas canvas) { // TODO Auto-generated method stubsuper.onDraw(canvas);//将图片裁剪为椭圆形 //构建ShapeDrawable对象并定义形状为椭圆 shapeDrawable = new ShapeDrawable(new OvalShape()); //得到画笔并设置渲染器 shapeDrawable.getPaint().setShader(bitmapShader); //设置显示区域 shapeDrawable.setBounds(20, 20,BitmapWidth-140,BitmapHeight); //绘制shapeDrawable shapeDrawable.draw(canvas); }}
