CODEWITHSUNDEEP
iphoneios4core-graphicscgpath
Chiubaka
Chiubaka

Reputation: 789

Creating an array of CGMutablePathRef's for iPhone?

I'm trying to use a loop to build a variable number of CGMutablePathRef's in order to draw a variable number of filled in wedges on a circle. For some reason, though, at the end of my loop my array returns with only one object. Here is the method I'm using to construct the array:

+ (NSMutableArray *)pathForCircleWithRect:(CGRect)rect numOfWedges:(NSUInteger)num
{
CGPoint center = CGPointMake(CGRectGetMidX(rect), CGRectGetMidY(rect));
CGFloat radius = rect.size.width / 2;
CGFloat angle = RADIANS(360) / num;

CGFloat startAngle = 0;
CGFloat endAngle = startAngle + angle;

NSMutableArray *paths = [NSMutableArray array];

for (int x = 0; x < num; x++);
{
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, center.x, center.y);
    CGPathAddArc(path, NULL, center.x, center.y, radius, startAngle, endAngle, 0);
    CGPathAddLineToPoint(path, NULL, center.x, center.y);

    [paths addObject:(id)path];
    startAngle = endAngle;
    endAngle = startAngle + angle;
}

return paths;
}

Edit New attempt using UIBezierPath's:

+ (NSMutableArray *)pathForCircleWithRect:(CGRect)rect numOfWedges:(NSUInteger)num
{
CGPoint center = CGPointMake(CGRectGetMidX(rect), CGRectGetMidY(rect));
CGFloat radius = rect.size.width / 2;
CGFloat angle = RADIANS(360) / num;

CGFloat startAngle = 0;
CGFloat endAngle = startAngle + angle;

NSMutableArray *paths = [NSMutableArray array];

for (int x = 0; x < num; x++);
{
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, center.x, center.y);
    CGPathAddArc(path, NULL, center.x, center.y, radius, startAngle, endAngle, 0);
    CGPathAddLineToPoint(path, NULL, center.x, center.y);

    [paths addObject:[UIBezierPath bezierPathWithCGPath:path]];
    startAngle = endAngle;
    endAngle = startAngle + angle;
}

return paths;
}

The code that calls this function:

- (void)drawRect:(CGRect)rect
{
int num = 18;
NSMutableArray *paths = [WheelView pathForCircleWithRect:rect numOfWedges:num];
NSMutableArray *colors = [WheelView colorsForCircleWithNumOfWedges:num];
CGContextRef context = UIGraphicsGetCurrentContext();

for (int x = 0; x < num; x++)
{
    CGContextSetFillColorWithColor(context, (CGColorRef)[colors objectAtIndex:x]);
    CGContextSaveGState(context);
    CGMutablePathRef wedgePath = (CGMutablePathRef)[paths objectAtIndex:x];
    CGContextAddPath(context, wedgePath);
    CGContextDrawPath(context, kCGPathFill);
    //CGContextClip(context);
    CGContextRestoreGState(context);
}
}

Upvotes: 3

Views: 1636

Answers (1)

Chiubaka
Chiubaka

Reputation: 789

The answer to this was much simpler than memory leaks, although the memory leaks would undoubtedly have led to problems down the road. My code simply wouldn't run because I accidentally placed a semicolon at the end of a for line, so the for loop didn't even run.

Upvotes: 1

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