自定义View之画笔Paint

作者: Small_Cake | 来源:发表于2022-05-23 16:20 被阅读0次

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

1.基本属性

方法	名称	取值说明
`setAntiAlias(boolean aa)`	抗锯齿	`true`，`flase`
`setColor(@ColorInt int color)`	颜色	`Color.RED`,`Color.GREEN`...
`setStyle(Style style);`	填充	`FILL`填充内部,`STROKE`仅描边,`FILL_AND_STROKE`
`setStrokeWidth(float width);`	笔宽	1234567...Max
`setShadowLayer (float radius, float dx, float dy, int color)`	阴影	`radius`阴影的倾斜度`dx`水平位移`dy`垂直位移
`setPathEffect(PathEffect effect)`	路径样式	ComposePathEffect, CornerPathEffect, DashPathEffect, DiscretePathEffect, PathDashPathEffect, SumPathEffect

2.特殊属性

方法	名称	取值说明
`setStrokeCap(Paint.Cap cap)`	线帽	`Cap.BUTT`，`Cap.SQUARE`，`Cap.ROUND`
`setStrokeJoin(Paint.Join join)`	线段连接样式	`Join.MITER`，`Join.Round`，`Join.BEVEL`
`setPathEffect(PathEffect effect)`	路径样式	取值类型是所有派生自`PathEffect`的子类

setStrokeCap(Paint.Cap cap)线帽

        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);

        //垂直画出x=100这条线
        paint.reset();
        paint.setStrokeWidth(2);
        paint.setColor(Color.RED);
        canvas.drawLine(100,100,100,800,paint);
        canvas.drawLine(400,100,400,800,paint);

加上线帽后头尾都多了一帽子

setStrokeJoin(Paint.Join join)线段连接样式
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);

分别为MITER,ROUND,BEVEL

分别为MITER,ROUND,BEVEL,转角不为90的情况

setPathEffect(PathEffect effect)路径样式

方法	名称	取值说明
`CornerPathEffect`	圆形拐角效果	`public CornerPathEffect(float radius)`radius：即当前连接两条直线所使用的圆的半径
`DashPathEffect`	虚线效果	`public DashPathEffect(float intervals[], float phase)`intervals[]：表示组成虚线的各个线段的长度；整条虚线就是由intervals[]中这些基本线段循环组成的。比如，我们定义new float[] {20,10}；那这个虚线段就是由两段线段组成的，第一个可见的线段长为20，每二个线段不可见，长度为10。
`DiscretePathEffect`	离散路径效果	`public DiscretePathEffect(float segmentLength, float deviation)`其中`segmentLength`表示将原来的路径切成多长的线段,`deviation`表示被切成的每个小线段的偏移距离
`PathDashPathEffect`	印章路径效果	`public PathDashPathEffect(Path shape, float advance, float phase,Style style)`
`ComposePathEffect`	合成路径效果	`public ComposePathEffect(PathEffect outerpe, PathEffect innerpe)`显示两种效果的一条组合路径
`SumPathEffect`	求和路径效应	`public SumPathEffect(PathEffect first, PathEffect second)`两种效果的两条路径重叠显示

Path shape:表示印章路径，比如我们下面示例中的三角形加右上角一个点；
float advance：表示两个印章路径间的距离,很容易理解，印章间距离越大，间距就越大。
float phase：路径绘制偏移距离，与上面DashPathEffect中的float phase参数意义相同
Style style：表示在遇到转角时，如何操作印章以使转角平滑过渡，取值有：Style.ROTATE，Style.MORPH，Style.TRANSLATE;Style.ROTATE表示通过旋转印章来过渡转角；Style.MORPH表示通过变形印章来过渡转角；Style.TRANSLATE表示通过位移来过渡转角

        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圆形拐角

        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画线段
        paint.setPathEffect(new DashPathEffect(new float[]{20,10,100,100},0));
        canvas.translate(20,0);
        canvas.drawPath(path,paint);

        //画同一条线段,偏移值为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虚线段

        Paint paint = getPaint();
        Path path = getPath();
//第一条原生Path
        canvas.drawPath(path,paint);
//第二条Path
        canvas.translate(0,200);
        paint.setPathEffect(new DiscretePathEffect(2,5));
        canvas.drawPath(path,paint);
//第三条Path
        canvas.translate(0,200);
        paint.setPathEffect(new DiscretePathEffect(6,5));
        canvas.drawPath(path,paint);
//第四条Path
        canvas.translate(0,200);
        paint.setPathEffect(new DiscretePathEffect(6,15));
        canvas.drawPath(path,paint);

DiscretePathEffect离散路径效应

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

//构建印章路径
        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);

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

PathDashPathEffect印章路径效果

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

//仅应用圆角特效的路径
        canvas.translate(0,200);
        CornerPathEffect cornerPathEffect = new CornerPathEffect(100);
        paint.setPathEffect(cornerPathEffect);
        canvas.drawPath(path,paint);

//仅应用虚线特效的路径
        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先应用圆角特效,再应用虚线特效
        canvas.translate(0,200);
        ComposePathEffect composePathEffect = new ComposePathEffect(dashPathEffect,cornerPathEffect);
        paint.setPathEffect(composePathEffect);
        canvas.drawPath(path,paint);

//利用SumPathEffect,分别将圆角特效应用于原始路径,然后将生成的两条特效路径合并
        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.字体相关

方法	名称	取值说明
`setTextSize(float textSize)`	文字大小	`float`
`setFakeBoldText(boolean fakeBoldText)`	粗体文字	`boolean`
`setStrikeThruText(boolean strikeThruText)`	删除线	`boolean`
`setUnderlineText(boolean underlineText)`	下划线	`boolean`
`setTextAlign(Paint.Align align)`	文字基线位置	`Align.LEFT`,`Align.CENTER`,`Align.RIGHT`,这里的位置是说的绘制起点x,y相对于文字的位置，而不是要绘制的文字对应起点x,y的位置
`setTextScaleX(float scaleX)`	水平拉伸	`float`
`setTextSkewX(float skewX)`	水平倾斜度	`float`
`setTypeface(Typeface typeface)`	字体样式	`android.graphics.Typeface`
`setLinearText(boolean linearText)`	文本线性缓存	`boolean`开启后会影响显示速度
`setSubpixelText(boolean subpixelText)`	亚像素	可以增加字体清晰度，实测效果无明显变化

4.图像处理和measure测量相关

方法	名称	取值说明
`setShader(Shader shader)`	作色器	https://www.cnblogs.com/tianzhijiexian/p/4298660.html
`setShadowLayer(float radius, float dx, float dy, int shadowColor)`	阴影	https://www.jianshu.com/p/2f1024f9c554
`setDither(boolean dither)`	防抖动	https://blog.csdn.net/lovexieyuan520/article/details/50732023
`setColorFilter(ColorFilter filter)`	颜色过滤	https://blog.csdn.net/aigestudio/article/details/41316141
`setXfermode(Xfermode xfermode)`	图像混合模式	https://www.cnblogs.com/tianzhijiexian/p/4297172.html
`setFilterBitmap(boolean filter)`	位图滤波处理	http://www.360doc.com/content/16/0821/22/26833809_584860347.shtml
`clearShadowLayer()`	清除阴影	清除阴影

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