CODEWITHSUNDEEP
macoscocoacore-graphics
A O
A O

Reputation: 5698

CGContextRef vs NSGraphicsContext

I just started learning OSX programming, and I've stumbled upon a problem where I don't know if I should use CGContextRef or NSGraphicsContext.

What is the difference?

I barely know the difference between CG or NS [and how they relate to cocoa] (I've tried googling to no avail)

Could anybody shed some light on when I would want to use either, or what the key differences are?

I'd take a link to an article, even. I just can't find anything from my web searches.

I know I'm asking a lot of questions in one, so thanks in advance!

Upvotes: 4

Views: 1185

Answers (2)

silicontrip
silicontrip

Reputation: 1026

CG based commands use a C like syntax. NS based commands use the Objective-c style interface;

- (void)drawRect:(NSRect)nr
{

    NSGraphicsContext* gc = [NSGraphicsContext currentContext];
    CGContextRef cggc = [gc CGContext];

    CGPathRef cgp = CGPathCreateMutable();
// do CGPath stuff
    CGContextFlush(cggc);


    NSBezierPath* nzb = [[NSBezierPath alloc] init];

// Do NSPath stuff

    [gc flushGraphics];

}

Upvotes: 0

A O
A O

Reputation: 5698

For anybody who's reading this, NSGraphicsContext layers on top of CGContextRef; and similar to most CG<->NS relations, the NS counterpart mirrors the CG's basic functionality.

But NSGraphicsContext allows you to do a little more, such as 'graphicsContextWithGraphicsPort' to create context from a graphics port.

Upvotes: 2

Related Questions