沿圆形矩形路径绘制元素Android

Question

我正在构建一个表盘，我想沿着圆角矩形路径绘制刻度线，但我不知道从哪里开始。

是否有一种方法可以创建一个形状（在这种情况下为圆形矩形），然后每隔x个像素就得到它的点？

Answer 1

这应该让你开始。

//Path for a rounded rectangle. 
    path = new Path(); 
    path.moveTo(rx, 0); 
    path.lineTo(width - rx, 0); 
    path.quadTo(width, 0, width,ry); 
    path.lineTo(width, height-ry); 
    path.quadTo(width, height, width-rx,height); 
    path.lineTo(rx, height); 
    path.quadTo(0,height, 0, height-ry); 
    path.lineTo(0,ry); 
    path.quadTo(0, 0, rx, 0); 
    //valid APIs less than 21. 

    float centerX = (x+width)/2; 
    float centerY = (y+height)/2; 
    //get center point 

    int number_of_ticks = 60; 
    int amount_towards_center = 10; 

    ticks = new Path(); 
    PathMeasure pathMeasure = new PathMeasure(path, false); 
    float fSegmentLen = pathMeasure.getLength()/number_of_ticks; 
    float afP[] = {0f, 0f}; 

    for (int i = 0; i < number_of_ticks; i++) { 
     pathMeasure.getPosTan(fSegmentLen * i, afP, null); 
     ticks.moveTo(afP[0], afP[1]); 
     float dX = (centerX-afP[0])/amount_towards_center; 
     float dY = (centerY-afP[1])/amount_towards_center; 
     ticks.lineTo(afP[0]+dX, afP[1]+dY); 
    } 

事实上，如果你不想变得有趣，它可能会让你完成。

@Override 
public void draw(Canvas canvas, Paint paint) { 
    canvas.drawPath(ticks,paint); 
    canvas.drawPath(path,paint); 
} 

和油漆SANS填写：

paint = new Paint(); 
    paint.setColor(Color.BLACK); 
    paint.setStyle(Paint.Style.STROKE);