Re: Hillegass, Third Edition, Chapter 18

[Aron Nopanen]

Jon,






-Aron

On 15/07/2008, at 3:53 PM, Jon Buys wrote:

Your post sounds like a statement of fact more than a question, but I assume you're wondering why you can't draw multiple ovals? The view will be redrawn at various points, outside of your control, and your drawRect: routine must re-draw all previously-drawn ovals each time. This means you have to store the ovals in an array or similar and iterate through them each time. I have an implementation that does this, along with supporting undo/ redo and save to file/open from file; I'm happy to send you the source if you'd like to refer to it.

Hello All,

think its time to let another set of eyes look at it.

Any help would be greatly appreciated.

Thanks,

Jon


to get in touch.  Maybe we can help each other out!

code follows:

ChalkBoard.m:

//

//  ChalkBoard.m

//  OvalDraw

//

//  Created by Jon on 7/10/08.

//  Copyright 2008 __MyCompanyName__. All rights reserved.

//


#import "ChalkBoard.h"



@implementation ChalkBoard


- (void)drawRect:(NSRect)rect

{

NSRect bounds = [self bounds];

[[NSColor blackColor] set];

[NSBezierPath fillRect:bounds];


but where can I put it so the window will remember it and not redraw?

[[NSColor whiteColor] set];

[[NSBezierPath bezierPathWithOvalInRect:ovalRect] stroke];


[oval stroke];

}



#pragma mark Events


- (void)mouseDown:(NSEvent *)event

{

NSLog(@"mouseDown: %d", [event clickCount]);

NSPoint p = [event locationInWindow];

downPoint = [self convertPoint:p fromView:nil];

currentPoint = downPoint;

[self setNeedsDisplay:YES];

}



- (void)mouseDragged:(NSEvent *)event

{

NSPoint p = [event locationInWindow];

NSLog(@"mouseDragged:%@", NSStringFromPoint(p));

currentPoint = [self convertPoint:p fromView:nil];

[self setNeedsDisplay:YES];


}


- (void)mouseUp:(NSEvent *)event

{

NSPoint p = [event locationInWindow];

NSLog(@"mouseUp:%@", NSStringFromPoint(p));

currentPoint = [self convertPoint:p fromView:nil];


[self setNeedsDisplay:YES];


}



#pragma mark Accessors




- (NSRect)currentRect

{

float minX = MIN(downPoint.x, currentPoint.x);

float maxX = MAX(downPoint.x, currentPoint.x);

float minY = MIN(downPoint.y, currentPoint.y);

float maxY = MAX(downPoint.y, currentPoint.y);

return NSMakeRect(minX, minY, maxX-minX, maxY-minY);

}


@end
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I'm working through the challenge app at the end of Chapter 18 of Cocoa Programming, Third Edition. I've got my app to the point where it can draw ovals, but each time I click in the window it seems like the view redraws itself. I'm sure that this is a very simple question with a very simple answer, but I'm stuck. I've been looking at it for three days now, and I On a separate note, anyone else working through this book, please feel free NSRect ovalRect = [self currentRect]; //OK, so this should not be here,

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