MPWDrawingContext is a light-weight Objective-C wrapper around CoreGraphics
CGContextRef and corresponding functions.
Code is on Github:https://github.com/mpw/MPWDrawingContext
Infrequently Asked Questions:
Why would anyone need an Objective-C drawing context?
In short, while CoreGraphics is an awesome graphics subsystem, not having OO
features makes CGContext closed to extension by anyone but Apple, and somewhat
unpleasant to use, IMHO.
I explain a bit more about the motivation on my blog:
http://blog.metaobject.com/2012/06/pleasant-objective-c-drawing-context.html
Who cares about possible future expansion when that means there's lots of code
to integrate with nasty dependencies?
1 Class, 1 Protocol, 3 extra include files to equalize some of the differences
between iOS and OSX (could probably be reduced).
1 additional class (MPWView) is purely optional
In the github project, the code is actually integrated into an adapted version
of Matt Gallagher's IconApp, so you have a working example right there.
But Cocoa has some fine drawing functionality with NSBezierPath,
NSAffineTransform and friends
True, but MPWDrawingContext works identically on both iOS and Mac OS X. In
fact there's also an MPWView class that works on both iOS and OSX, which is
used in the sample code mentioned above to create an iOS app using the same
drawing code as the OS X app.
I also prefer my graphics context to not be a hidden global parameter that's
implicitly used by a bunch of other objects.
Who cares about OSX ^ iOS?
Based on my unscientific experiments, MPWDrawingContext reduces the code I have
to write for even one of the two platforms by about 20-30%. Your mileage will
almost certainly vary.
Who cares about less code?
Well, it\s not just less code, it's more pleasant code as well:
[context moveto:0 :0] lineto:100 :0] lineto:50 :50] closepath]
stroke];
vs.
CGContextMoveToPoint( context, 0, 0 );
CGContextAddLineToPoint( context, 100, 0);
CGContextAddLineToPoint( context, 50, 50 );
CGContextClosePath( context );
CGContextFillPath( context );
And
bitmapContext = [MPWCGDrawingContext rgbBitmapContext:NSMakeSize( 595,
842 )];
vs.
bitmapContext = CGBitmapContextCreate(NULL, size.width, size.height, 8,
0,
CGColorSpaceCreateDeviceRGB(),
kCGImageAlphaPremultipliedLast) |
kCGBitmapByteOrderDefault );
No it's not!
OK :-)
Marcel
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