PaintCode: Circle Maintains A/R? - objective-c

Question

In Paintcode 2, I have a circle inside a frame inside a canvas.
The constraints on the circle are set like this:
To get the circle to size up and not become an ellipse, I have to
Know the expected aspect ratio
Code it in Objective-C myself
Is there any way around this type of code?
-(void)drawRect:(CGRect)rect {
if (rect.size.width > rect.size.height) {
rect.origin.x = (rect.size.width - rect.size.height) * .5f;
rect.size.width = rect.size.height;
} else {
rect.origin.y = (rect.size.height - rect.size.width) * .5f;
rect.size.height = rect.size.width;
}
NSLog(#"Frame=%#", NSStringFromCGRect(rect));
[CircleDraw drawCircleWithFrame:rect];
}

Answer 1

Create a canvas, 150x120
Create an ellipse, 10, 10, 100, 100
Create a new variable called frame, type rectangle: 10, 10, 150, 100
Create a new expression called smallestSide: min(frame.height, frame.width)
Make an expression called position (below)
Drag smallestSide to both height and width of the ellipse
Drag the position to the position of the ellipse
position (Expression)
makePoint(
frame.x+(frame.width-smallestSide)*0.5,
frame.y+(frame.height-smallestSide)*0.5
)
output
- (void)drawCanvas1WithFrame: (CGRect)frame
{
//// Variable Declarations
CGFloat smallestSide = MIN(frame.size.height, frame.size.width);
CGPoint position = CGPointMake(frame.origin.x + (frame.size.width - smallestSide) * 0.5, frame.origin.y + (frame.size.height - smallestSide) * 0.5);
//// Oval Drawing
UIBezierPath* ovalPath = [UIBezierPath bezierPathWithOvalInRect: CGRectMake(position.x, position.y, smallestSide, smallestSide)];
[UIColor.grayColor setFill];
[ovalPath fill];
}
NOTE: I had the help of Matt Dunik at PaintCode to figure this out, but the solution is actually very straightforward.