自定义View之Paint.Style

1. Style.STROKE 描边绘制
2. Style.FILL 填充绘制，以画笔的中心线往内绘制填充
3. Style.FILL_AND_STROKE，描边与填充同时绘制，
4. 另：如果要区分描边与填充的颜色，则可以参考下图2&3的代码。3是先绘制填充后绘制描边；2是先描边后填充，则线条宽度被填充覆盖了一般；
5. path.rewind() 不修改之前的绘制状态，重置path的路径并保留内部数据结构用以快速复用。

==注意==：若mPath未闭合，则Style.STROKE才可以绘制成功；因为未闭合，则不存在内部填充的概念。

lineToAndStyle.png

        //第一个
        mPath.reset()
        mPath.moveTo(50f, 50f)
        mPath.lineTo(r / 4 - 50, r / 4 - 50)
        mPath.lineTo(r / 4 - 50, 50f)
        mPath.close()
        mPaint.color = Color.parseColor("red")
        mPaint.style = Paint.Style.STROKE
        canvas.drawPath(mPath, mPaint)

        mPath.rewind()//若不在此处调用，那么第一个图形会绘制出第二个的效果，即绘制第一个图形的path状态被覆盖了
        mPath.moveTo(r / 4 + 50f, 50f)
        mPath.lineTo(2 * r / 4 - 50, r / 4 - 50)
        mPath.lineTo(2 * r / 4 - 50, 50f)
        mPath.close()
        canvas.drawPath(mPath, mPaint)//先绘制线条
        mPaint.color = Color.parseColor("grey")
        mPaint.style = Paint.Style.FILL
        canvas.drawPath(mPath, mPaint)//再绘制填充

        mPath.rewind()
        mPath.moveTo(2 * r / 4 + 50f, 50f)
        mPath.lineTo(3 * r / 4 - 50, r / 4 - 50)
        mPath.lineTo(3 * r / 4 - 50, 50f)
        mPath.close()
        mPaint.color = Color.parseColor("grey")
        mPaint.style = Paint.Style.FILL_AND_STROKE
        canvas.drawPath(mPath, mPaint)
        mPaint.color = Color.parseColor("red")
        mPaint.style = Paint.Style.STROKE
        canvas.drawPath(mPath, mPaint)

        mPath.rewind()
        mPath.moveTo(3 * r / 4 + 50f, 50f)
        mPath.lineTo(r - 50, r / 4 - 50)
        mPath.lineTo(r - 50, 50f)
        mPath.close()
        mPaint.color = Color.parseColor("red")
        mPaint.style = Paint.Style.STROKE
        canvas.drawPath(mPath, mPaint)
        mPaint.color = Color.parseColor("grey")
        mPaint.style = Paint.Style.FILL_AND_STROKE
        canvas.drawPath(mPath, mPaint)