[英]Draw element along a round rect path Android
我正在构建表盘,并且想沿圆角矩形路径绘制刻度线,但是我不知道应该从哪里开始。
有没有一种方法可以创建形状(在这种情况下为圆角矩形),然后每x像素获取一个点?
这应该使您入门。
//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);
}
实际上,如果您不想花哨的话,它也可能会让您结识。
@Override
public void draw(Canvas canvas, Paint paint) {
canvas.drawPath(ticks,paint);
canvas.drawPath(path,paint);
}
和油漆没有填充:
paint = new Paint();
paint.setColor(Color.BLACK);
paint.setStyle(Paint.Style.STROKE);
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