Android用Path类绘制路径

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Pathpath = new Path();path.moveTo(0, 0);for(int i = 1; i <= 15; i++) {//生成15个点，随机生成他们的Y坐标，并将它们连成一条Pathpath.lineTo(i*20, (float)Math.random()*60);}//初始化7个颜色colors = new int[]{Color.BLACK, Color.BLUE, Color.CYAN, Color.GREEN,Color.MAGENTA, Color.RED, Color.YELLOW};}@Overrideprotected void onDraw(Canvas canvas) {//将背景色填充成白色canvas.drawColor(Color.WHITE);//----------下面开始初始化7中路径效果----------//不使用路径效果effects[0] = null;//使用CornerPathEffect路径效果effects[1] = new CornerPathEffect(10);//初始化(不连续的、离散的)DiscretePathEffecteffects[2] = new DiscretePathEffect(3.0f, 5.0f);//初始化DashPathEffecteffects[3] = new DashPathEffect(new float[]{20,10,5,10}, phase);//初始化PathDashPathEffectsPath 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ComposePathEffecteffects[5] = new ComposePathEffect(effects[2], effects[4]);//初始化SumPathEffecteffects[6] = new SumPathEffect(effects[4], effects[3]);//将画布移动到(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();}}