iPhone iOS以编程方式生成星形,旭日形或多边形UIBezierPath

Question

我正在寻找一种使用UIBezierPath以编程方式创建星星,旭日和其他"尖刺"效果的方法.

UIBezierPath *sunbeamsPath = [UIBezierPath bezierPath];
[sunbeamsPath moveToPoint: CGPointMake(x, y)];

是否有任何算法能够以编程方式为形状为sunburst生成点,而不会重叠路径？

我也对如下所示的不规则形状的旭日感兴趣:

我会想象这样的算法会占用一定数量的光线,然后在多个线段中粗略地划分圆圈,并在顺时针方向上为这样的线段生成点.我所描述的算法是否已经存在,或者我必须自己编写一个算法？

谢谢!

Answer 1

我知道这很古老,但我对这个问题的第一部分感到好奇,并且在jrturton的帖子中,我创建了一个自定义的UIView,它从视图的中心生成一个UIBezierPath.甚至动画它旋转奖励积分.结果如下:

我使用的代码在这里:

- (void)drawRect:(CGRect)rect {
CGFloat radius = rect.size.width/2.0f;

[self.fillColor setFill];
[self.strokeColor setStroke];

UIBezierPath *bezierPath = [UIBezierPath bezierPath];
CGPoint centerPoint = CGPointMake(rect.origin.x + radius, rect.origin.y + radius);

CGPoint thisPoint = CGPointMake(centerPoint.x + radius, centerPoint.y);
[bezierPath moveToPoint:centerPoint];

CGFloat thisAngle = 0.0f;
CGFloat sliceDegrees = 360.0f / self.beams / 2.0f;

for (int i = 0; i < self.beams; i++) {

    CGFloat x = radius * cosf(DEGREES_TO_RADIANS(thisAngle + sliceDegrees)) + centerPoint.x;
    CGFloat y = radius * sinf(DEGREES_TO_RADIANS(thisAngle + sliceDegrees)) + centerPoint.y;
    thisPoint = CGPointMake(x, y);
    [bezierPath addLineToPoint:thisPoint];
    thisAngle += sliceDegrees;

    CGFloat x2 = radius * cosf(DEGREES_TO_RADIANS(thisAngle + sliceDegrees)) + centerPoint.x;
    CGFloat y2 = radius * sinf(DEGREES_TO_RADIANS(thisAngle + sliceDegrees)) + centerPoint.y;
    thisPoint = CGPointMake(x2, y2);
    [bezierPath addLineToPoint:thisPoint];
    [bezierPath addLineToPoint:centerPoint];
    thisAngle += sliceDegrees;

}

[bezierPath closePath];

bezierPath.lineWidth = 1;
[bezierPath fill];
[bezierPath stroke];

}

您可以在此处下载示例项目:

https://github.com/meekapps/Sunburst