/*
 
 File: ovals.c
 
 Abstract: //	These are the functions  that implement equivalents to the QuickDraw oval
		   //	drawing APIs, FrameOval and PaintOval.
		   //	See DrawProcs.c for sample usage
 
 Version: 1.0
 
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#define _BSD_SOURCE
#include <math.h>
#include <stdbool.h>
#ifdef __APPLE__
#include <ApplicationServices/ApplicationServices.h>
#else
#include <CoreGraphics/CoreGraphics.h>
#endif
 
 /*
addOvalToPath : Adds to the context a path for an oval just inside the bounding rectangle that you specify.

Parameter Descriptions
context : The CG context to render to.
r :  The CG rectangle that defines the ovalŐs boundary.
*/

void addOvalToPath(CGContextRef context, CGRect r)
{
    CGAffineTransform matrix;
	
	// Save the context's state because we are going to transform and scale it
    CGContextSaveGState(context);

	// Create a transform to scale the context so that a radius of 1
	// is equal to the bounds of the rectangle, and transform the origin
	// of the context to the center of the bounding rectangle.  The 
	// center of the bounding rectangle will now be the center of
	// the oval.
    matrix = CGAffineTransformMake((r.size.width)/2, 0,
								   0, (r.size.height)/2,
								   r.origin.x + (r.size.width)/2,
								   r.origin.y + (r.size.height)/2);
 
	// Apply the transform to the context
    CGContextConcatCTM(context, matrix);

	// Signal the start of a path
    CGContextBeginPath(context);
	
	// Add a circle to the path.  After the circle is transformed by the
	// context's transformation matrix, it will become an oval lying
	// just inside the bounding rectangle.
    CGContextAddArc(context, 0, 0, 1, 0, 2*M_PI, 0);

	// Restore the context's state. This removes the translation and scaling but leaves
	// the path, since the path is not part of the graphics state.
	CGContextRestoreGState(context);
}

 
/*
paintOval : Paints the interior of an oval just inside the bounding rectangle that you specify.

Parameter Descriptions
context : The CG context to render to.
r :  The CG rectangle that defines the ovalŐs boundary.
*/

void paintOval(CGContextRef context, CGRect r)
{
	// Add a path for the oval to this context
	addOvalToPath(context,r);

	// Fill the oval
    CGContextFillPath(context);
}

/*
frameOval : Draws an outline of an oval just inside the bounding rectangle that you specify.

Parameter Descriptions
context : The CG context to render to.
r :  The CG rectangle that defines the ovalŐs boundary.
*/
void frameOval(CGContextRef context, CGRect r)
{
	// Add a path for the oval to this context
	addOvalToPath(context,r);

	// Stroke the path
	CGContextStrokePath(context);
}
