Path类可以预先在View上将N个点连成一条"路径",然后调用Canvas的drawPath(path,paint)即可沿着路径绘制图形
Android还为路径绘制提供了PathEffect来定义绘制效果,PathEffect包含如下子类
ComposePathEffect
CornerPathEffect
DashPathEffect
DiscretePathEffect
PathDashPathEffect
SumPathEffect
下面的示例将会逐一使用上面的绘制效果
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package WangLi.Graphics.PathTest;
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import android.app.Activity;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.ComposePathEffect;
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import android.graphics.CornerPathEffect;
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import android.graphics.DashPathEffect;
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import android.graphics.DiscretePathEffect;
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import android.graphics.Paint;
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import android.graphics.Path;
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import android.graphics.PathDashPathEffect;
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import android.graphics.PathEffect;
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import android.graphics.SumPathEffect;
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import android.os.Bundle;
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import android.view.View;
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public class PathTest extends Activity {
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(new MyView(this));
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}
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class MyView extends View
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{
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float phase;
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PathEffect[] effects = new PathEffect[7];
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int[] colors;
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private Paint paint;
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Path path;
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public MyView(Context context) {
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super(context);
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paint = new Paint();
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paint.setStyle(Paint.Style.STROKE);
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paint.setStrokeWidth(4);
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path = new Path();
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path.moveTo(0, 0);
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for(int i = 1; i<= 15; i++)
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{
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path.lineTo(i*20, (float)Math.random()*60);
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}
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colors = new int[] {
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Color.BLACK,Color.BLUE,Color.CYAN,
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Color.GREEN,Color.MAGENTA,Color.RED,Color.YELLOW
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};
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}
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protected void onDraw(Canvas canvas)
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{
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canvas.drawColor(Color.WHITE);
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effects[0] = null;
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effects[1] = new CornerPathEffect(10);
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effects[2] = new DiscretePathEffect(3.0f,5.0f);
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effects[3] = new DashPathEffect(new float[]{20,10,5,10},phase);
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Path p = new Path();
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p.addRect(0, 0, 8, 8, Path.Direction.CCW);
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effects[4] = new PathDashPathEffect(p,12,phase,PathDashPathEffect.Style.ROTATE);
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effects[5] = new ComposePathEffect(effects[2],effects[4]);
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effects[6] = new SumPathEffect(effects[4],effects[3]);
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canvas.translate(8, 8);
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for(int i = 0; i < effects.length; i++)
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{
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paint.setPathEffect(effects[i]);
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paint.setColor(colors[i]);
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canvas.drawPath(path, paint);
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canvas.translate(0, 60);
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}
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phase += 1;
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invalidate();
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}
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}
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}
效果如下

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Android 室内定位系列:<1>地图构建
原文:http://blog.csdn.net/guomutian911/article/details/48023087