參考：https://blog.csdn.net/harvic880925/article/details/51010839

1.基本屬性

2.特殊屬性

• setStrokeCap(Paint.Cap cap)線帽

        Paint paint = new Paint();
        paint.setStrokeWidth(80);
        paint.setAntiAlias(true);
        paint.setColor(Color.GREEN);
        paint.setStyle(Paint.Style.STROKE);

        paint.setStrokeCap(Paint.Cap.BUTT);
        canvas.drawLine(100,200,400,200,paint);
        paint.setStrokeCap(Paint.Cap.SQUARE);
        canvas.drawLine(100,400,400,400,paint);
        paint.setStrokeCap(Paint.Cap.ROUND);
        canvas.drawLine(100,600,400,600,paint);

        //垂直畫出x=100這條線
        paint.reset();
        paint.setStrokeWidth(2);
        paint.setColor(Color.RED);
        canvas.drawLine(100,100,100,800,paint);
        canvas.drawLine(400,100,400,800,paint);

加上線帽后頭尾都多了一帽子

• setStrokeJoin(Paint.Join join)線段連接樣式
  Paint paint = new Paint();
  paint.setStrokeWidth(8);
  paint.setColor(Color.GREEN);
  paint.setStyle(Paint.Style.STROKE);

    Path path = new Path();
    path.moveTo(100,600);
    path.lineTo(400,100);
    path.lineTo(700,600);
  
    canvas.drawPath(path,paint);
  
    paint.setColor(Color.RED);
    paint.setPathEffect(new CornerPathEffect(100));
    canvas.drawPath(path,paint);
  
    paint.setColor(Color.LTGRAY);
    paint.setPathEffect(new CornerPathEffect(300));
    canvas.drawPath(path,paint);
  

        Paint paint = new Paint();
        paint.setStrokeWidth(100);
        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.STROKE);
        paint.setAntiAlias(true);

        Path path  = new Path();
        path.moveTo(100,200);
        path.lineTo(400,200);
        path.lineTo(400,400);
        paint.setStrokeJoin(Paint.Join.MITER);
        canvas.drawPath(path,paint);

        path.moveTo(100,500);
        path.lineTo(400,500);
        path.lineTo(400,700);
        paint.setStrokeJoin(Paint.Join.ROUND);
        canvas.drawPath(path,paint);

        path.moveTo(100,800);
        path.lineTo(400,800);
        path.lineTo(400,1000);
        paint.setStrokeJoin(Paint.Join.BEVEL);
        canvas.drawPath(path,paint);

分別為MITER,ROUND,BEVEL

分別為MITER,ROUND,BEVEL,轉(zhuǎn)角不為90的情況

• setPathEffect(PathEffect effect)路徑樣式

Path shape:表示印章路徑，比如我們下面示例中的三角形加右上角一個點；
float advance：表示兩個印章路徑間的距離,很容易理解，印章間距離越大，間距就越大。
float phase：路徑繪制偏移距離，與上面DashPathEffect中的float phase參數(shù)意義相同
Style style：表示在遇到轉(zhuǎn)角時，如何操作印章以使轉(zhuǎn)角平滑過渡，取值有：Style.ROTATE，Style.MORPH，Style.TRANSLATE;Style.ROTATE表示通過旋轉(zhuǎn)印章來過渡轉(zhuǎn)角；Style.MORPH表示通過變形印章來過渡轉(zhuǎn)角；Style.TRANSLATE表示通過位移來過渡轉(zhuǎn)角

        Path path = new Path();
        path.moveTo(100,600);
        path.lineTo(400,100);
        path.lineTo(700,600);

        canvas.drawPath(path,paint);

        paint.setColor(Color.RED);
        paint.setPathEffect(new CornerPathEffect(100));
        canvas.drawPath(path,paint);

        paint.setColor(Color.LTGRAY);
        paint.setPathEffect(new CornerPathEffect(300));
        canvas.drawPath(path,paint);

CornerPathEffect圓形拐角

        Path path = new Path();
        path.moveTo(100,600);
        path.lineTo(300,100);
        path.lineTo(600,600);

        canvas.drawPath(path,paint);
        paint.setColor(Color.RED);

        //使用DashPathEffect畫線段
        paint.setPathEffect(new DashPathEffect(new float[]{20,10,100,100},0));
        canvas.translate(20,0);
        canvas.drawPath(path,paint);

        //畫同一條線段,偏移值為15
        paint.setPathEffect(new DashPathEffect(new float[]{20,10,50,100},15));
        paint.setColor(Color.BLACK);
        canvas.translate(20,0);
        canvas.drawPath(path,paint);

DashPathEffect虛線段

        Paint paint = getPaint();
        Path path = getPath();
//第一條原生Path
        canvas.drawPath(path,paint);
//第二條Path
        canvas.translate(0,200);
        paint.setPathEffect(new DiscretePathEffect(2,5));
        canvas.drawPath(path,paint);
//第三條Path
        canvas.translate(0,200);
        paint.setPathEffect(new DiscretePathEffect(6,5));
        canvas.drawPath(path,paint);
//第四條Path
        canvas.translate(0,200);
        paint.setPathEffect(new DiscretePathEffect(6,15));
        canvas.drawPath(path,paint);

DiscretePathEffect離散路徑效應(yīng)

        Paint paint = getPaint();
        Path path = new Path();
//畫出原始路徑
        path.moveTo(100,600);
        path.lineTo(400,100);
        path.lineTo(700,600);
        canvas.drawPath(path,paint);

//構(gòu)建印章路徑
        Path stampPath  = new Path();
        stampPath.moveTo(0,20);
        stampPath.lineTo(10,0);
        stampPath.lineTo(20,20);
        stampPath.close();
        stampPath.addCircle(0,0,3, Path.Direction.CCW);

//使用印章路徑效果
        canvas.translate(0,100);
        paint.setPathEffect(new PathDashPathEffect(stampPath,35,0, PathDashPathEffect.Style.TRANSLATE));
        canvas.drawPath(path,paint);

PathDashPathEffect印章路徑效果

       //畫原始路徑
        Paint paint = getPaint();
        Path path = getPath();
        canvas.drawPath(path,paint);

//僅應(yīng)用圓角特效的路徑
        canvas.translate(0,200);
        CornerPathEffect cornerPathEffect = new CornerPathEffect(100);
        paint.setPathEffect(cornerPathEffect);
        canvas.drawPath(path,paint);

//僅應(yīng)用虛線特效的路徑
        canvas.translate(0,200);
        DashPathEffect dashPathEffect = new DashPathEffect(new float[]{2,5,10,10},0);
        paint.setPathEffect(dashPathEffect);
        canvas.drawPath(path,paint);

//利用ComposePathEffect先應(yīng)用圓角特效,再應(yīng)用虛線特效
        canvas.translate(0,200);
        ComposePathEffect composePathEffect = new ComposePathEffect(dashPathEffect,cornerPathEffect);
        paint.setPathEffect(composePathEffect);
        canvas.drawPath(path,paint);

//利用SumPathEffect,分別將圓角特效應(yīng)用于原始路徑,然后將生成的兩條特效路徑合并
        canvas.translate(0,200);
        paint.setStyle(Paint.Style.STROKE);
        SumPathEffect sumPathEffect = new SumPathEffect(cornerPathEffect,dashPathEffect);
        paint.setPathEffect(sumPathEffect);
        canvas.drawPath(path,paint);

ComposePathEffect和SumPathEffect

3.字體相關(guān)

4.圖像處理和measure測量相關(guān)