Android用Canvas绘制贝塞尔曲线

/**
?* Created by Administrator on 2015/9/17.
?*/
public class MyPathView extends View {
private int height;
private int width;
private Path path;//路径
private Paint mPaint;
private Paint mPaintpoint;
private int count;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case 0x23://这应该写一个static final的变量
count++;
if (count < 80) {//形成循环，因为波浪线是两段40所以一个周期80
? ? ? ? ? ? ? ? ? ? ? ? setCount(count);
handler.sendEmptyMessageDelayed(0x23, 20);
? ? ? ? ? ? ? ? ? ? } else {
count = 0;
handler.sendEmptyMessageDelayed(0x23, 20);
? ? ? ? ? ? ? ? ? ? }
break;
? ? ? ? ? ? }

? ? ? ? }
? ? };

public void setCount(int count) {
this.count = count;
? ? ? ? invalidate();
? ? }

public MyPathView(Context context) {
super(context);
? ? }

public MyPathView(Context context, AttributeSet attrs) {
super(context, attrs);
path = new Path();
mPaint = new Paint();
mPaintpoint = new Paint();
mPaintpoint.setStrokeWidth(10);
mPaintpoint.setColor(Color.YELLOW);
mPaint.setAntiAlias(true);
mPaint.setTextSize(50);
mPaint.setStyle(Paint.Style.STROKE);
handler.sendEmptyMessage(0x23);//
? ? }

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

@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, 10, 40, 0);//以（count=0，100）为原点开始画，控制点、结束点
path.rQuadTo(20, -10, 40, 0);//以（40，0）为原点开始画，形成一个类似余弦的波浪周期
? ? ? ? }
? ? ? ? canvas.drawPath(path, mPaint);
使用quadTo绘制曲线
// ? ? ?path.moveTo(100, 100);
// ? ? ? ?path.quadTo(100, 400, 300, 300);//控制点终点
// ? ? ? ?canvas.drawPoint(100,100,mPaintpoint);//起点
// ? ? ? ?canvas.drawPoint(100,400,mPaintpoint);//控制点
// ? ? ? ?canvas.drawPoint(300,300,mPaintpoint);//终点
}
}