Android ＰＡＴＨ类动态绘制

package com.wcs;

import android.R.color;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ComposePathEffect;
import android.graphics.CornerPathEffect;
import android.graphics.DashPathEffect;
import android.graphics.DiscretePathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PathDashPathEffect;
import android.graphics.PathEffect;
import android.graphics.SumPathEffect;
import android.os.Bundle;
import android.view.View;

public class PathTest extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(new MyView(this));
}

class MyView extends View {

float phase;
PathEffect[] effects = new PathEffect[7];
int[] colors;
private Paint paint;
Path path;

public MyView(Context context) {
super(context);
paint = new Paint();
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(4);
path = new Path();
path.moveTo(0, 0);
for (int i = 1; i <= 15; i++) {
path.lineTo(i * 20, (float) Math.random() * 60);
}
colors = new int[] { Color.BLACK, Color.BLUE, Color.CYAN,
Color.GREEN, Color.MAGENTA, Color.RED, Color.YELLOW };

}

@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
effects[0]=null;
effects[1]=new CornerPathEffect(10);
effects[2]=new DiscretePathEffect(3.0f, 5.0f);
effects[3]=new DashPathEffect(new float[]{20,10,5,10}, phase);
Path p=new Path();
p.addRect(0, 0,8,8,Path.Direction.CCW);
effects[4]=new PathDashPathEffect(p, 12, phase,PathDashPathEffect.Style.ROTATE);
effects[5]=new ComposePathEffect(effects[2], effects[4]);
effects[6]=new SumPathEffect(effects[4], effects[3]);
canvas.translate(8, 8);
for(int i=0;i<effects.length;i++){
paint.setPathEffect(effects[i]);
paint.setColor(colors[i]);
canvas.drawPath(path,paint);
canvas.translate(0, 60);
phase+=1;
invalidate();
}

}
}
}

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