Class SetPolyToPoly

CustomView/Advance/Code/SetPolyToPoly.java:24–129

Author: GcsSloop Created Date: 16/8/26 Copyright (C) 2016 GcsSloop. GitHub: https://github.com/GcsSloop

 * GitHub: https://github.com/GcsSloop
 */
public class SetPolyToPoly extends View{
    private static final String TAG = "SetPolyToPoly";

    private int testPoint = 0;
    private int triggerRadius = 180;    // 触发半径为180px

    private Bitmap mBitmap;             // 要绘制的图片
    private Matrix mPolyMatrix;         // 测试setPolyToPoly用的Matrix

    private float[] src = new float[8];
    private float[] dst = new float[8];

    private Paint pointPaint;

    public SetPolyToPoly(Context context) {
        this(context, null);
    }

    public SetPolyToPoly(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public SetPolyToPoly(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initBitmapAndMatrix();
    }

    private void initBitmapAndMatrix() {
        mBitmap = BitmapFactory.decodeResource(getResources(),
                R.drawable.poly_test2);

        float[] temp = {0, 0,                                    // 左上
                mBitmap.getWidth(), 0,                          // 右上
                mBitmap.getWidth(), mBitmap.getHeight(),        // 右下
                0, mBitmap.getHeight()};                        // 左下
        src = temp.clone();
        dst = temp.clone();

        pointPaint = new Paint();
        pointPaint.setAntiAlias(true);
        pointPaint.setStrokeWidth(50);
        pointPaint.setColor(0xffd19165);
        pointPaint.setStrokeCap(Paint.Cap.ROUND);

        mPolyMatrix = new Matrix();
        mPolyMatrix.setPolyToPoly(src, 0, src, 0, 4);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        switch (event.getAction()){
            case MotionEvent.ACTION_MOVE:
                float tempX = event.getX();
                float tempY = event.getY();

                // 根据触控位置改变dst
                for (int i=0; i<testPoint*2; i+=2 ) {