iphone - 如何将CGContextAddArc(CGContextRef)中的所有点存储到NSMUtableArray

Question

如何将 CGContextAddArc 中的所有像素点存储到 NSMutableArray. 或 CGContextRef 到 NSMutable Array

static inline float radians(double degrees) 
{
 return degrees * PI / 180;
}

- (void)drawRect:(CGRect)rect
{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGRect parentViewBounds = self.bounds;
    CGFloat x = CGRectGetWidth(parentViewBounds)/2;
    CGFloat y = CGRectGetHeight(parentViewBounds)/2;
    UIColor *rbg=[UIColor redColor];
    CGContextSetFillColor(context, CGColorGetComponents( [rbg CGColor]));
    CGContextMoveToPoint(context, x, y); 
    CGContextAddArc(context, x, y,100,radians(35),radians(105),0); 
        CGContextClosePath(context); 
        CGContextFillPath(context);
// here I want to store All points Containing in the Arc to NSMutableArray


 NSMutableArray *pointsArray=????
        }

图片

Answer 1

存储或者当你想在NSValue中的CGPoint数组中添加点时，

NSValue *point = [NSValue valueWithCGPoint:CGPointMake(your_X, your_Y)];
[pointsArray addObject:point];

现在在检索时，您将如何从数组中的 NSVaule stroe 读取 CGPoint，

NSValue *getPoint = [pointsArray objectAtIndex:i];
CGPoint thePoint = [getPoint CGPointValue];

thePoint 将是您的答案。