android繪圖Path類仿加速球水面波動效果

android提供的Path類，他可以預先在View上連成路徑，然後調用Canvas的drawPath（path，paint），沿著路徑畫出來即可；
【1】畫三角形

//        path.moveTo(100, 100);
//        path.lineTo(0, 200);
//        path.lineTo(200, 200);
//        path.close();//連接首尾
//        canvas.drawPath(path, paint);
//        canvas.drawTextOnPath(我沿著這條線走, path, 0, 0, paint);

【畫貝塞爾曲線】

 //貝塞爾曲線

//        path.moveTo(100,100);
//        path.quadTo(100, 400, 300, 300);//兩個點：控制點；結束點
//        canvas.drawPath(path, paint);
//canvas.drawPoint(100, 100, paintPoint);
//canvas.drawPoint(100,400,paintPoint);
//canvas.drawPoint(300,300,paintPoint);

【仿水邊波動效果】

public class MyPathView extends View {
    private Paint paint;
    private Path path;
    private Paint paintPoint;
    private int width;
    private int height;

    private int count = 0;
    private int size = 0;

    private boolean isAdd=true;
    private Handler handler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case 0x23:
                    count+=5;
                    if(count>=80){
                        count=0;
                    }
                    if (isAdd){
                        size++;
                        if(size>10){
                            isAdd = false;
                        }
                    }else{
                        size--;
                        if(size<=-10){
                            isAdd =true;
                        }
                    }
                    invalidate();
                    sendEmptyMessageDelayed(0x23,100);
                    break;
            }



        }
    };

    public MyPathView(Context context, AttributeSet attrs) {
        super(context, attrs);
        paint = new Paint();
        paint.setAntiAlias(true);
        paint.setTextSize(30);
        paint.setStyle(Paint.Style.STROKE);



        paintPoint = new Paint();
        paintPoint.setStrokeWidth(10);
        paintPoint.setColor(Color.GREEN);
        paintPoint.setStyle(Paint.Style.FILL);

        path = new Path();

        handler.sendEmptyMessageDelayed(0x23, 1000);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        path.reset();

        path.moveTo(count, 100);
        for (int i = 0; i < 10; i++) {
            path.rQuadTo(20, 20, 40, 0);
            path.rQuadTo(20, -20, 40, 0);

        }

        canvas.drawPath(path, paint);
        canvas.drawRect(200, 0, 400, 200, paint);

    }


    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
        height = getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec);
        setMeasuredDimension(width, height);
    }
}

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