android旋转图像Matrix
16lz
2021-12-04
package com.weipeng.xuexi20160121;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Matrix;import android.graphics.Paint;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.AttributeSet;import android.view.View;import android.widget.FrameLayout;public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); FrameLayout frameLayout = (FrameLayout) findViewById(R.id.myfl); frameLayout.addView(new MyView(this)); } class MyView extends View{ public MyView(Context context) { super(context); } public MyView(Context context, AttributeSet attrs) { super(context, attrs); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); Paint paint = new Paint();//定义画笔 Bitmap bitmap = BitmapFactory.decodeResource(MainActivity.this.getResources(),R.drawable.hehe); canvas.drawBitmap(bitmap,0,0,paint);//绘制背景图 Bitmap bitmap_rabbit = BitmapFactory.decodeResource(MainActivity.this.getResources(), R.drawable.hehe); Matrix matrix = new Matrix(); matrix.setRotate(30);//以0,0为轴心旋转30度 canvas.drawBitmap(bitmap_rabbit, matrix, paint); Matrix m = new Matrix(); m.setRotate(90,87,87);//以87,87为轴心旋转90度 canvas.drawBitmap(bitmap_rabbit,m,paint); } }}
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