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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

package WangLi.Graphics.PathTest;    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 {      /** Called when the activity is first created. */      @Override      public void onCreate(Bundle savedInstanceState) {          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);              //创建,并初始化Path              path = new Path();              path.moveTo(0, 0);              for(int i = 1; i<= 15; i++)              {                  //生成15个点,随机生成它们的坐标,并将它们连成一条Path                  path.lineTo(i*20, (float)Math.random()*60);              }              //初始化七个颜色              colors = new int[] {                      Color.BLACK,Color.BLUE,Color.CYAN,                      Color.GREEN,Color.MAGENTA,Color.RED,Color.YELLOW              };          }          protected void onDraw(Canvas canvas)          {              //将背景填充成白色              canvas.drawColor(Color.WHITE);              //-------下面开始初始化7中路径的效果              //使用路径效果              effects[0] = null;              //使用CornerPathEffect路径效果              effects[1] = new CornerPathEffect(10);              //初始化DiscretePathEffect              effects[2] = new DiscretePathEffect(3.0f,5.0f);              //初始化DashPathEffect              effects[3] = new DashPathEffect(new float[]{20,10,5,10},phase);              //初始化PathDashPathEffect              Path p = new Path();              p.addRect(0, 0, 8, 8, Path.Direction.CCW);              effects[4] = new PathDashPathEffect(p,12,phase,PathDashPathEffect.Style.ROTATE);              //初始化PathDashPathEffect              effects[5] = new ComposePathEffect(effects[2],effects[4]);              effects[6] = new SumPathEffect(effects[4],effects[3]);              //将画布移到8,8处开始绘制              canvas.translate(8, 8);              //依次使用7中不同路径效果,7种不同的颜色来绘制路径              for(int i = 0; i < effects.length; i++)              {                  paint.setPathEffect(effects[i]);                  paint.setColor(colors[i]);                  canvas.drawPath(path, paint);                  canvas.translate(0, 60);              }              //改变phase值,形成动画效果              phase += 1;              invalidate();          }      }  }

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