/*

 File: rects.c

 Abstract: //   These are the functions  that implement equivalents to the QuickDraw rect,

           //   drawing APIs, FrameRect, PaintRect.

           //   See DrawProcs.c for sample usage

 Version: 1.0

 Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple

 Computer, Inc. ("Apple") in consideration of your agreement to the

 following terms, and your use, installation, modification or

 redistribution of this Apple software constitutes acceptance of these

 terms.  If you do not agree with these terms, please do not use,

 install, modify or redistribute this Apple software.

 In consideration of your agreement to abide by the following terms, and

 subject to these terms, Apple grants you a personal, non-exclusive

 license, under Apple's copyrights in this original Apple software (the

 "Apple Software"), to use, reproduce, modify and redistribute the Apple

 Software, with or without modifications, in source and/or binary forms;

 provided that if you redistribute the Apple Software in its entirety and

 without modifications, you must retain this notice and the following

 text and disclaimers in all such redistributions of the Apple Software. 

 Neither the name, trademarks, service marks or logos of Apple Computer,

 Inc. may be used to endorse or promote products derived from the Apple

 Software without specific prior written permission from Apple.  Except

 as expressly stated in this notice, no other rights or licenses, express

 or implied, are granted by Apple herein, including but not limited to

 any patent rights that may be infringed by your derivative works or by

 other works in which the Apple Software may be incorporated.

 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND

 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,

 MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED

 AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),

 STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE

 POSSIBILITY OF SUCH DAMAGE.

 Copyright © 2005 Apple Computer, Inc., All Rights Reserved

 */ 

#include "rects.h"

/*

frameRect : Draws the outline of a rectangle.

Parameter Descriptions

context : The CG context to render to.

r :  The CG rectangle that defines the rectangle's boundary.

*/

void frameRect(CGContextRef context, CGRect r)

{   

    CGContextStrokeRect(context, r);

}

/*

paintRect : Paints the interior of an rectangle.

Parameter Descriptions

context : The CG context to render to.

r :  The CG rectangle that defines the rectangle's boundary.

*/

void paintRect(CGContextRef context, CGRect r)

{

    CGContextFillRect(context, r);

}

/*

addRoundedRectToPath : Adds a rectangle with rounded courners to the current CG path

Parameter Descriptions

rect : The CG rectangle that defines the rectangle's boundary.

ovalWidth : The width of the CG rectangle that encloses the rounded corners

ovalHeight : The height of the CG rectangle that encloses the rounded corners

context : The CG context to render to.

*/

static void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth,

                          float ovalHeight)

{

    float fw, fh;

    // If the width or height of the corner oval is zero, then it reduces to a right angle,

    // so instead of a rounded rectangle we have an ordinary one.

    if (ovalWidth == 0 || ovalHeight == 0) {

        CGContextAddRect(context, rect);

        return;

    }

    //  Save the context's state so that the translate and scale can be undone with a call

    //  to CGContextRestoreGState.

    CGContextSaveGState(context);

    //  Translate the origin of the contex to the lower left corner of the rectangle.

    CGContextTranslateCTM(context, CGRectGetMinX(rect), CGRectGetMinY(rect));

    //Normalize the scale of the context so that the width and height of the arcs are 1.0

    CGContextScaleCTM(context, ovalWidth, ovalHeight);

    // Calculate the width and height of the rectangle in the new coordinate system.

    fw = CGRectGetWidth(rect) / ovalWidth;

    fh = CGRectGetHeight(rect) / ovalHeight;

    // CGContextAddArcToPoint adds an arc of a circle to the context's path (creating the rounded

    // corners).  It also adds a line from the path's last point to the begining of the arc, making

    // the sides of the rectangle.

    CGContextMoveToPoint(context, fw, fh/2);  // Start at lower right corner

    CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1);  // Top right corner

    CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1); // Top left corner

    CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1); // Lower left corner

    CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1); // Back to lower right

    // Close the path

    CGContextClosePath(context);

    // 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);

}

/*

fillRoundedRect : fills a rounded rectangle with the current fill color

Parameter Descriptions

rect : The CG rectangle that defines the rectangle's boundary.

ovalWidth : The width of the CG rectangle that encloses the rounded corners

ovalHeight : The height of the CG rectangle that encloses the rounded corners

context : The CG context to render to.

*/

void fillRoundedRect(CGContextRef context, CGRect rect, float ovalWidth, float

                     ovalHeight)

{

    // Signal the start of a path

    CGContextBeginPath(context);

    // Add a rounded rect to the path

    addRoundedRectToPath(context, rect, ovalWidth, ovalHeight);

    // Fill the path

    CGContextFillPath(context);

}

/*

strokeRoundedRect : Draws a rounded rectangle with the current stroke color

Parameter Descriptions

rect : The CG rectangle that defines the rectangle's boundary.

ovalWidth : The width of the CG rectangle that encloses the rounded corners

ovalHeight : The height of the CG rectangle that encloses the rounded corners

context : The CG context to render to.

*/

void strokeRoundedRect(CGContextRef context, CGRect rect, float ovalWidth,

                       float ovalHeight)

{

    // Signal the start of a path

    CGContextBeginPath(context);

    // Add a rounded rect to the path

    addRoundedRectToPath(context, rect, ovalWidth, ovalHeight);

    // Stroke the path

    CGContextStrokePath(context);

}