android的几种点染与裁剪

android的几种渲染与裁剪

import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapShader;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.ComposeShader;import android.graphics.LinearGradient;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.RadialGradient;import android.graphics.Shader;import android.graphics.SweepGradient;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.ShapeDrawable;import android.graphics.drawable.shapes.OvalShape;import android.view.KeyEvent;import android.view.MotionEvent;import android.view.View;public class GameView extends View implements Runnable{/* 声明Bitmap对象 */BitmapmBitQQ= null;intBitQQwidth= 0;intBitQQheight= 0;Paint   mPaint = null;/* Bitmap渲染 */Shader mBitmapShader = null;/* 线性渐变渲染 */Shader mLinearGradient = null;/* 混合渲染 */Shader mComposeShader = null;/* 唤醒渐变渲染 */Shader mRadialGradient = null;/* 梯度渲染 */Shader mSweepGradient = null;ShapeDrawable mShapeDrawableQQ = null;public GameView(Context context){super(context);/* 装载资源 */mBitQQ = ((BitmapDrawable) getResources().getDrawable(R.drawable.qq)).getBitmap();/* 得到图片的宽度和高度 */BitQQwidth = mBitQQ.getWidth();BitQQheight = mBitQQ.getHeight();/* 创建BitmapShader对象 */mBitmapShader = new BitmapShader(mBitQQ,Shader.TileMode.REPEAT,Shader.TileMode.MIRROR);/* 创建LinearGradient并设置渐变的颜色数组 */mLinearGradient = new LinearGradient(0,0,100,100, new int[]{Color.RED,Color.GREEN,Color.BLUE,Color.WHITE}, null,Shader.TileMode.REPEAT);/* 这里笔者理解为“混合渲染”--大家可以有自己的理解，能明白这个意思就好*/mComposeShader = new ComposeShader(mBitmapShader,mLinearGradient,PorterDuff.Mode.DARKEN);/* 构建RadialGradient对象，设置半径的属性 *///这里使用了BitmapShader和LinearGradient进行混合//当然也可以使用其他的组合//混合渲染的模式很多，可以根据自己需要来选择mRadialGradient = new RadialGradient(50,200,50, new int[]{Color.GREEN,Color.RED,Color.BLUE,Color.WHITE}, null,Shader.TileMode.REPEAT);/* 构建SweepGradient对象 */mSweepGradient = new SweepGradient(30,30,new int[]{Color.GREEN,Color.RED,Color.BLUE,Color.WHITE},null);mPaint = new Paint();/* 开启线程 */new Thread(this).start();}public void onDraw(Canvas canvas){super.onDraw(canvas);//将图片裁剪为椭圆形/* 构建ShapeDrawable对象并定义形状为椭圆 */mShapeDrawableQQ = new ShapeDrawable(new OvalShape());/* 设置要绘制的椭圆形的东西为ShapeDrawable图片 */mShapeDrawableQQ.getPaint().setShader(mBitmapShader);/* 设置显示区域 */mShapeDrawableQQ.setBounds(0,0, BitQQwidth, BitQQheight);/* 绘制ShapeDrawableQQ */mShapeDrawableQQ.draw(canvas); //绘制渐变的矩形mPaint.setShader(mLinearGradient);canvas.drawRect(BitQQwidth, 0, 320, 156, mPaint);//显示混合渲染效果mPaint.setShader(mComposeShader);canvas.drawRect(0, 300, BitQQwidth, 300+BitQQheight, mPaint);//绘制环形渐变mPaint.setShader(mRadialGradient);canvas.drawCircle(50, 200, 50, mPaint);//绘制梯度渐变mPaint.setShader(mSweepGradient);canvas.drawRect(150, 160, 300, 300, mPaint);}// 触笔事件public boolean onTouchEvent(MotionEvent event){return true;}// 按键按下事件public boolean onKeyDown(int keyCode, KeyEvent event){return true;}// 按键弹起事件public boolean onKeyUp(int keyCode, KeyEvent event){return false;}public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event){return true;}/** * 线程处理 */public void run(){while (!Thread.currentThread().isInterrupted()){try{Thread.sleep(100);}catch (InterruptedException e){Thread.currentThread().interrupt();}//使用postInvalidate可以直接在线程中更新界面postInvalidate();}}}

?还有一些形状处理的类在