android绘图Path类仿加速球水面波动效果

android提供的Path类，他可以预先在View上连成路径，然后调用Canvas的drawPath（path，paint），沿着路径画出来即可；
【1】画三角形

//        path.moveTo(100, 100);//        path.lineTo(0, 200);//        path.lineTo(200, 200);//        path.close();//连接首尾//        canvas.drawPath(path, paint);//        canvas.drawTextOnPath("我沿着这条线走", path, 0, 0, paint);

【画贝塞尔曲线】

 //贝塞尔曲线// path.moveTo(100,100);// path.quadTo(100, 400, 300, 300);//两个点：控制点；结束点// canvas.drawPath(path, paint);//canvas.drawPoint(100, 100, paintPoint);//canvas.drawPoint(100,400,paintPoint);//canvas.drawPoint(300,300,paintPoint);

【仿水边波动效果】

android绘图Path类仿加速球水面波动效果_第1张图片

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);    }}

布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <com.example.administrator.canvas.widget.MyPathView        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>

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