/*

    File:       MyQuartzView.m

    Description:    Implementation file for the MyQuartzView class.  Shows how to draw both aliased and anti-aliased arcs.

    Copyright:  © Copyright 2010 Apple Inc. All rights reserved.

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                copyrights in this original Apple software (the "Apple Software"), to use,

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    Change History (most recent first):

        7/16/03     1.0     Initial version

*/

#import "MyQuartzView.h"

//#### utility code

#define PI 3.14159265358979323846

static inline double radians(double degrees) { return degrees * PI / 180; }

static void

drawAnX(CGContextRef gc)

{

    CGPoint p;

    p = CGContextGetPathCurrentPoint(gc);

    CGContextMoveToPoint(gc, p.x + 3, p.y + 3);

    CGContextAddLineToPoint(gc, p.x - 3, p.y - 3);

    CGContextMoveToPoint(gc, p.x + 3, p.y - 3);

    CGContextAddLineToPoint(gc, p.x - 3, p.y + 3);

    CGContextStrokePath(gc);

}

//####

@implementation MyQuartzView

- (id)initWithFrame:(NSRect)frameRect

{

    [super initWithFrame:frameRect];

    return self;

}

- (void)drawRect:(NSRect)rect

{

    int k;

    CGRect pageRect;

    CGContextRef context = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];

    //#################################################################

    //##    Insert sample drawing code here

    //##

    //##    Note that at this point, the current context CTM is set up such that

    //##        that the context size corresponds to the size of the view

    //##        i.e. one unit in the context == one pixel

    //##    Also, the origin is in the bottom left of the view with +y pointing up

    //##

    //#################################################################

    pageRect = CGRectMake(0, 0, rect.size.width, rect.size.height);

    CGContextBeginPage(context, &pageRect);

    //  Start with black fill and stroke colors

    CGContextSetRGBFillColor(context, 0, 0, 0, 1);

    CGContextSetRGBStrokeColor(context, 0, 0, 0, 1);

    //  The current path for the context starts out empty

    assert(CGContextIsPathEmpty(context));

    CGContextTranslateCTM(context, 50, 50);

    CGContextAddArc(context, 55, 210, 36, radians(25), radians(65), 0);

    CGContextStrokePath(context);

    CGContextAddArc(context, 45, 200, 36, radians(25), radians(65), 1);

    CGContextStrokePath(context);

    //  Drawing (stroking or filling) a path consumes it

    assert(CGContextIsPathEmpty(context));

    //  Draw some wide, non-antialiased ellipses

    CGContextSaveGState(context);

    CGContextSetLineWidth(context, 2);

    CGContextSetShouldAntialias(context, 0);

    CGContextTranslateCTM(context, 150, 195);

    for (k = 0; k < 4; k++) {

    CGContextAddArc(context, 0, 0, 54, 0, 2*PI, 0);

    CGContextStrokePath(context);

    CGContextTranslateCTM(context, 0, -72);

    CGContextScaleCTM(context, 1, 0.75);

    }

    CGContextRestoreGState(context);

    CGContextAddArc(context, 50, 100, 54, radians(40), radians(140), 0);

    CGContextStrokePath(context);

    CGContextBeginPath(context);

    CGContextMoveToPoint(context, 50, 85);

    CGContextAddArc(context, 50, 65, 54, radians(40), radians(140), 0);

    CGContextStrokePath(context);

    CGContextSaveGState(context);

    CGContextTranslateCTM(context, 200, 0);

    CGContextMoveToPoint(context, 50, 50);

    drawAnX(context);

    CGContextMoveToPoint(context, 50, 150);

    drawAnX(context);

    CGContextMoveToPoint(context, 150, 150);

    drawAnX(context);

    CGContextMoveToPoint(context, 50, 50);

    CGContextAddArcToPoint(context, 50, 150, 150, 150, 36);

    CGContextStrokePath(context);

    CGContextRestoreGState(context);

    CGContextEndPage(context);

    CGContextFlush(context);

}

@end