CODEWITHSUNDEEP
objective-cxcode4.5quartz-2d
user2073270
user2073270

Reputation: 11

Moving Rectangle in Quartz

I am attempting to learn the basics of quartz and do not understand why this will not work - this should move the red rectangle to the right when the button is pushed, bat at the momoent, it does not do anything - the "NSLog(A"help"); was to try to figure out if the button was functioning - thanks

@implementation QuartzView

-(IBAction)moveRight:(id)sender{

    NSLog(@"Help");

    lR += 50;

}

- (id)initWithFrame:(NSRect)frameRect
{
    self = [super initWithFrame:frameRect];
    if (self) {

    }

    return self;
}

- (void)drawRect:(NSRect)dirtyRect
{
    CGContextRef myContext = [[NSGraphicsContext // 1
                               currentContext] graphicsPort];

    // Drawing code here.
    CGContextSetRGBFillColor (myContext, 1, 0, 0, 1);// 3
    CGContextFillRect (myContext, CGRectMake (lR, 0, 200, 100 ));

    [self setNeedsDisplay:YES];
}

@end

Thanks!

Upvotes: 1

Views: 149

Answers (2)

i_am_jorf
i_am_jorf

Reputation: 54630

Try [self setNeedsDisplay] inside moveRight after you increment lR.

Upvotes: 0

Mark Bernstein
Mark Bernstein

Reputation: 2080

You don't want to call setNeedsDisplay in drawRect; that simply says, "now that I've drawn the view, make me do it again!"

You want to call setNeedsDisplay in your action, to update the screen after you moves the rectangle.

Upvotes: 1

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