URL:
<http://savannah.gnu.org/bugs/?34742>
Summary: NSAffineTransform ignored in most cases
Project: GNUstep
Submitted by: julian_
Submitted on: Do 03 Nov 2011 22:30:31 GMT
Category: Gui/AppKit
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
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Details:
i am using NSAffineTransform in two cases in my application and in both cases
gnustep completely ignores it.
first case - drawing into a NSImage flipped - since it doesn't work on gnustep
i must produce the flipping through coordinate modification:
NSImage *theImage = [[NSImage alloc] initWithSize:NSMakeSize(size,
size)];
[theImage lockFocus];
NSAffineTransform *t = [NSAffineTransform transform];
[t scaleXBy:1.0 yBy:-1.0];
[t translateXBy:0.0 yBy:-size];
[t concat];
[[NSColor blackColor] setStroke];
NSBezierPath* aPath = [NSBezierPath bezierPath];
[aPath setLineJoinStyle:NSRoundLineJoinStyle];
[aPath setLineWidth:size / 25.0f];
[aPath moveToPoint:NSMakePoint(10, 10)];
[aPath lineToPoint:NSMakePoint(20, 20)];
[aPath lineToPoint:NSMakePoint(10, 30)];
[aPath stroke];
[theImage unlockFocus];
second case - getting the flipped contents of a NSImage - since the flipping
doesn't work i must copy the data row by row in reverse instead:
NSImage *theImg = [[NSImage alloc] initWithContentsOfURL:_url];
NSBitmapImageRep *bitmap = [NSBitmapImageRep alloc];
NSImageRep *rep = [theImg bestRepresentationForDevice: nil];
[theImg lockFocus];
NSAffineTransform *t = [NSAffineTransform transform];
[t scaleXBy:1.0 yBy:-1.0];
[t translateXBy:0.0 yBy:-imgSize.height];
[t concat];
[rep drawInRect:NSMakeRect(0,0,[theImg size].width, [theImg
size].height)];
[bitmap initWithFocusedViewRect:NSMakeRect(0.0, 0.0, [theImg
size].width, [theImg size].height)];
[theImg unlockFocus];
int bpp = [bitmap bitsPerPixel] / 8;
int bpp = 4;
const int rowsize = [theImg size].width * bpp;
_data = (char *)calloc( rowsize * [theImg size].height, 1);
memcpy(_data, [bitmap bitmapData], [theImg size].width * bpp *
[theImg size].height);
_______________________________________________________
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<http://savannah.gnu.org/bugs/?34742>
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