CGContext - Drawing Circle

[Dave]

Hi,

I have a custom class, subclassed from UIControl that draws a circle with an X 
in it (like a circular check box control). This works ok, but the circle looks 
scrappy when displayed on the iPad. The method that does the work is appended 
to this mail and is called from the drawRect method of the class.

Is there something I am doing wrong? It really doesn't look like a nice circle!

Thanks in advance,
Dave

- (void) drawCheckBoxStyleCircle:(CGRect) theDrawRect
{
CGContextRef            myGraphicsContext;
CGFloat                 myStrokeColor[4] = {0,0,0,1};
CGFloat                 myFillColor[4] = {255,255,255,1};
CGColorSpaceRef         myColorspaceRef;
CGFloat                 myCenterXPosition;
CGFloat                 myCenterYPosition;
CGFloat                 myRadius;
CGRect                  myInnerRect;


myGraphicsContext = UIGraphicsGetCurrentContext();

CGContextSetStrokeColor(myGraphicsContext,myStrokeColor);
CGContextSetFillColor(myGraphicsContext,myFillColor);

myColorspaceRef = CGColorSpaceCreateDeviceRGB();

myCenterXPosition = theDrawRect.origin.x + (theDrawRect.size.width / 2);
myCenterYPosition = theDrawRect.origin.y + (theDrawRect.size.height / 2);
myRadius = theDrawRect.size.width / 2;

CGContextSetLineWidth(myGraphicsContext,2);
CGContextAddArc(myGraphicsContext,myCenterXPosition,myCenterYPosition,myRadius,0,2
 * M_PI,1);
CGContextStrokePath(myGraphicsContext);

if (self.pCheckBoxSelectedFlag == YES) 
        {
        myInnerRect = CGRectMake(CGRectGetMinX(theDrawRect) + 
6,CGRectGetMinY(theDrawRect) + 6,CGRectGetWidth(theDrawRect) - 
12,CGRectGetHeight(theDrawRect) - 12);
        CGContextSetLineWidth(myGraphicsContext,3);

        CGContextBeginPath(myGraphicsContext);
        
CGContextMoveToPoint(myGraphicsContext,CGRectGetMinX(myInnerRect),CGRectGetMinY(myInnerRect));
        
CGContextAddLineToPoint(myGraphicsContext,CGRectGetMaxX(myInnerRect),CGRectGetMaxY(myInnerRect));
        CGContextStrokePath(myGraphicsContext);
        
        
CGContextMoveToPoint(myGraphicsContext,CGRectGetMinX(myInnerRect),CGRectGetMaxY(myInnerRect));
        
CGContextAddLineToPoint(myGraphicsContext,CGRectGetMaxX(myInnerRect),CGRectGetMinY(myInnerRect));
        CGContextStrokePath(myGraphicsContext);
        }
}

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