android 用canvas.clipPath 画不规则的Bitmap

 

转载请注明出处:http://www.bangchui.org/read.php?tid=10646

通过使用canvas.clipPath，可以将一个规则的位图裁剪为不规则的位图

一个矩形的图，一般画出来是这样子的:


我们需要画成这个样子：


通过canvas.clipPath(path);方法可以达到这个效果，看代码：

package org.bangchui;
 
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Path;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
 
public class MyView extends View {
    private Drawable mDrawable;
 
    public MyView(Context context) {
        super(context);
        init();
    }
 
    public MyView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }
 
    public MyView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }
 
    private void init() {
        mDrawable = getResources().getDrawable(R.drawable.testpath);
         
    }
 
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
         
        Path path = new Path();
        path.moveTo(0, 0);
        path.lineTo(300, 0);
         
        path.lineTo(300, 150);
         
        path.lineTo(150, 300);
         
        path.lineTo(0, 300);
         
        path.lineTo(0, 0);
         
        canvas.clipPath(path);
         
         
        mDrawable.setBounds(0, 0, getWidth(), getHeight());
        mDrawable.draw(canvas);
         
    }
     
     
 
}

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