surefaceView画图

最新推荐文章于 2023-06-17 12:46:37 发布

原创最新推荐文章于 2023-06-17 12:46:37 发布 · 566 阅读

CC 4.0 BY-SA版权

本示例展示如何使用Android的SurfaceView和Canvas来绘制一个红色的三角形。通过自定义SurfaceView并覆盖其绘图方法，利用Paint设置颜色及抗锯齿属性，并通过Canvas的drawLine方法绘制三角形的三条边。

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代码就是一个简单的画了一个三角，想画更多的，自己研究去

package alice.bw.com.surfaceviewdemo;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

/**
 * @author alice
 * @version 1.0
 * @Date 2017/10/25 11:11
 */
public class TriangleView extends SurfaceView {
    private SurfaceHolder holder;
    private MyDrawThread thread;



    public TriangleView(Context context) {
        super(context);
        initView();
    }



    public TriangleView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initView();
    }

    public TriangleView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initView();
    }


    private void initView() {
        holder = getHolder();
        thread = new MyDrawThread();
        holder.addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder surfaceHolder) {
                thread.start();
            }

            @Override
            public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {

            }

            @Override
            public void surfaceDestroyed(SurfaceHolder surfaceHolder) {

            }
        });




    }


    class MyDrawThread extends Thread{
        @Override
        public void run() {
            super.run();
            Paint paint = new Paint();
            paint.setColor(Color.RED);
            paint.setAntiAlias(true);

            Canvas canvas = holder.lockCanvas();
            canvas.drawColor(Color.BLUE);
            canvas.drawLine(200f,0f,0f,200f,paint);
            canvas.drawLine(0f,200f,400f,200f,paint);
            canvas.drawLine(200f,0f,400f,200f,paint);
            holder.unlockCanvasAndPost(canvas);

        }
    }
}