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Cocoa editing NSBezierPath


Cocoa editing NSBezierPath

By : user2956960
Date : November 22 2020, 03:03 PM
To fix this issue Every time you call drawRect: you are creating a new path and drawing it. Then, on the button press you modify the path.
So you have 2 problems:
code :


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Cocoa: filling an NSBezierPath with an image

Cocoa: filling an NSBezierPath with an image


By : Sphinx
Date : March 29 2020, 07:55 AM
Any of those help Jarret's answer is probably the best option, but if you wanted to avoid messing with the graphics context, you could also use NSColor's +colorWithPatternImage: class method. This basically lets you use an image anywhere you would normally use a color.
Cocoa NSBezierPath - stroke. Crashes with color different from predefined one

Cocoa NSBezierPath - stroke. Crashes with color different from predefined one


By : Amer
Date : March 29 2020, 07:55 AM
it fixes the issue The problem is that you are not properly retaining the borderColor instance variable. The -colorWithCalibratedRed:green:blue:alpha: method creates an autoreleased object, which, unless you retain it, will be automatically autoreleased (and deallocated) once the application event loop returns. The next time around, when you try to send a message to the deallocated object, problems occur.
The reason it happens to be working with -blackColor, -clearColor, etc. is pure luck (sort of). Those "convenience color" methods happen to return singleton instances that will never be deallocated. For example, if someone asks for -blackColor 1000 times, there's no sense in wasting memory by creating 1,000 separate instances; instead, the single (shared) instance is returned. However, this is a private implementation detail that you generally should not rely on.
code :
@property (retain) NSColor *borderColor;
// remember to safely release the old value if necessary 
borderColor = [[NSColor colorWithCalibratedRed:0.8
                        green:0.8 blue:0.8 alpha:1.0] retain];
Editing iTunes Library in Cocoa

Editing iTunes Library in Cocoa


By : C M B
Date : March 29 2020, 07:55 AM
Does that help The rationale for the Date Added property being read-only is that it represents the date that the file was added to the iTunes Library.
The .xml file is only used when you want to re-import your files into iTunes, it is rewritten on pretty much any change to the library.
Editing a NSBezierPath in Cocoa Application

Editing a NSBezierPath in Cocoa Application


By : Kavin Ndubane
Date : March 29 2020, 07:55 AM
should help you out You can't remove individual elements of an NSBezierPath. You can only edit existing elements or remove all of them. The best choice for your case would be to copy all elements (except the unwanted) to a new path.
If the path is very long and there might be a performance concern you could move the first and last points to match the second and second last point. This would not result in exactly the same drawing, though:
code :
NSInteger elementCount = [path elementCount];
if (elementCount > 2) {
    CGPoint points[3];
    [path elementAtIndex:1 associatedPoints:points];
    points[1] = points[0];
    points[2] = points[0];
    [path setAssociatedPoints:points atIndex:0];

    [path elementAtIndex:elementCount - 2 associatedPoints:points];
    points[1] = points[0];
    points[2] = points[0];
    [path setAssociatedPoints:points atIndex:elementCount - 1];
}
Making a ball/circle move in cocoa using nsbezierpath(objective -c))?

Making a ball/circle move in cocoa using nsbezierpath(objective -c))?


By : Raju
Date : March 29 2020, 07:55 AM
around this issue I am trying to Create a point on an image when the application runs and then try to move the point slowly to a different location. here is my code.This code works but there are two problems. , EDIT:
Here's a working implementation:
code :
@interface AppDelegate ()
@property ( nonatomic, readonly ) CALayer * ballLayer ;
@end

@implementation AppDelegate
@synthesize ballLayer = _ballLayer ;

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    [ ((NSView*)self.window.contentView) setWantsLayer:YES ] ;
    [ self performSelectorOnMainThread:@selector( doAnimation ) withObject:nil waitUntilDone:NO ] ;
}

-(void)doAnimation
{
    [ self.ballLayer addAnimation:[ self createBallLayerAnimation ] forKey:nil ] ;
}

-(CALayer*)ballLayer
{
    if ( !_ballLayer )
    {
        CALayer * layer = [ CALayer layer ] ;
        NSImage * image = [[ NSImage alloc ] initWithContentsOfURL:[ NSURL URLWithString:@"http://etc-mysitemyway.s3.amazonaws.com/icons/legacy-previews/icons/glossy-black-icons-sports-hobbies/044450-glossy-black-icon-sports-hobbies-ball-beach.png" ] ] ;
        layer.contents = image ;
        layer.bounds = (CGRect){ .size = { 100, 100 } } ;

        [((NSView*)self.window.contentView).layer addSublayer:layer ] ;

        _ballLayer = layer ;
    }

    return _ballLayer ;
}

-(CAAnimation*)createBallLayerAnimation
{
    CAKeyframeAnimation * anim = [ CAKeyframeAnimation animationWithKeyPath:@"position" ] ;
    {
        CGPathRef p = [ self createBallAnimationPath ] ;
        anim.path = p ;
        CGPathRelease( p ) ;
    }
    anim.duration = 3.0 ;
    anim.repeatCount = FLT_MAX ;

    return anim ;
}

-(CGPathRef)createBallAnimationPath
{
    CGRect bounds = ((NSView*)self.window.contentView).bounds ;
    CGPathRef p = CGPathCreateWithEllipseInRect( CGRectInset( bounds, bounds.size.width * 0.25, bounds.size.width * 0.25 ), NULL ) ;
    return p ;
}
@end
-(void)awakeFromNib
{
    [ super awakeFromNib ] ;
    [ self performSelectorOnMainThread:@selector( doAnimation ) withObject:nil waitUntilDone:NO ] ; // when the main thread runs again, call `-doAnimation`
}
-(void)doAnimation:
{
    CAAnimation * animation = [ CAKeyframeAnimation animationForKeyPath:@"position" ] ;
    CGPathRef path = [ self createBallAnimationPath ] ; // method -createBallAnimationPath is defined below...
    animation.path = path ;
    CGPathRelease( path ) ;
    [ self.ballLayer addAnimation:animation forKey:nil ] ; // ballLayer is the property that contains a reference to layer that contains the image you want to animate along the path
}
-(CGPathRef)createBallAnimationPath
{
    CGMutablePathRef result = CGPathCreateMutable() ;
    CGPathMoveToPoint( result, 100, 100 ) ;
    CGPathAddLineToPoint( result, 1000, 1000 ) ;
    return result ;
}
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