学习笔记（自定义虚线样式）---PathEffect

PathEffect有6个子类，想看更多内容，详见：

http://blog.csdn.net/aigestudio/article/details/41447349

之前为了自定义绘制虚线，研究了一下DashPathEffect，详见

http://blog.csdn.net/u014620028/article/details/73380396

为了修改自定义虚线的样式，今天学习了一下PathDashPathEffect。这个可以和之前的自定义虚线结合，扩展虚线样式。

效果图：

PathEffectView

package com.chen.demo2;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.DashPathEffect;import android.graphics.Paint;import android.graphics.Path;import android.graphics.Path.Direction;import android.graphics.PathDashPathEffect;import android.util.AttributeSet;import android.view.View;public class PathEffectView extends View {    // 画笔对象    //线段类型虚线    private Paint mPaint;    private Paint line_paint;    // 路径对象    private Path mPath_1;    private Path mPath_2;    private Path mPath_3;    //默认类型虚线    private DashPathEffect dashPathEffect;    //圆点类型虚线    private PathDashPathEffect pathDashPathEffect_1;    //矩形类型虚线    private PathDashPathEffect pathDashPathEffect_2;    public PathEffectView(Context context) {        this(context, null);    }    public PathEffectView(Context context, AttributeSet attrs) {        this(context, attrs, -1);    }    public PathEffectView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    private void init() {          /*         * 实例化画笔并设置属性，并打开抗锯齿         */        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        mPaint.setStyle(Paint.Style.STROKE);        mPaint.setStrokeWidth(10);        mPaint.setColor(Color.BLACK);        line_paint = new Paint();        line_paint.setColor(Color.RED);        line_paint.setStyle(Paint.Style.STROKE);        line_paint.setStrokeWidth(1);        //设置虚线路径起始点        mPath_1 = new Path();        //100,100为起点        mPath_1.moveTo(100, 100);        //400,100作为终点        mPath_1.lineTo(800, 100);        //设置虚线路径起始点        mPath_2 = new Path();        mPath_2.moveTo(100, 300);        mPath_2.lineTo(800, 300);        //设置虚线路径起始点        mPath_3 = new Path();        mPath_3.moveTo(100, 500);        mPath_3.lineTo(800, 500);        //普通虚线        dashPathEffect = new DashPathEffect(new float[]{20, 10, 50, 5, 100, 30, 10, 5}, 0);        //圆点类型虚线相关        Path path_1 = new Path();        //direction：方向        //CW：顺时针        //CCW：逆时针        path_1.addCircle(0, 0, 10, Direction.CCW);        /**         * Dash破碎 the drawn绘图 path by stamping冲压、冲击 it with the specified指定 shape. This only         * applies适用 to drawings when the paint's style is STROKE or STROKE_AND_FILL.         * If the paint's style is FILL, then this effect is ignored忽略. The paint's         * strokeWidth does not affect影响 the results.         * @param shape The path to stamp标记 along沿着         * @param advance spacing between each stamp of shape         * @param phase amount to offset before the first shape is stamped         * @param style how to transform改变、变换 the shape at each position as it is stamped         *         * 最后一个参数：         *  TRANSLATE：translate the shape to each position         *  ROTATE：rotate the shape about its center         *  MORPH：transform each point, and turn lines into curves         */        pathDashPathEffect_1 = new PathDashPathEffect(path_1, 50, 0, PathDashPathEffect.Style.ROTATE);        //矩形类型虚线相关        Path path_2 = new Path();        path_2.addRect(0, 0, 10, 10, Direction.CCW);        pathDashPathEffect_2 = new PathDashPathEffect(path_2, 50, 0, PathDashPathEffect.Style.ROTATE);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        mPaint.setPathEffect(dashPathEffect);        canvas.drawPath(mPath_1, mPaint);        mPaint.setPathEffect(pathDashPathEffect_1);        canvas.drawPath(mPath_2, mPaint);        mPaint.setPathEffect(pathDashPathEffect_2);        canvas.drawPath(mPath_3, mPaint);    }}