[Pythonmac-SIG] PyObjC and Quartz - CGContextDrawGlyphsAtPoint
Rand Dvorak
randdvorak at gmail.com
Mon Apr 29 03:57:59 CEST 2013
PyObjC on Snow Leopard and Xcode 3.2. I've been trying to draw some text into a PDF context with a custom barcode font. I've tried translating this source, found here to Python:
http://www.gogo-robot.com/2009/06/07/two-awkward-things-about-iphone-development/
And here is the relevant code for drawing the barcode:
class Barcode(Graphic):
initialized = NO
def __init__(self, rect, string, size):
self.string = string
self.font = None
self.size = size
if not self.initialized:
fontpath = NSBundle.mainBundle().pathForResource_ofType_("FRE3OF9X", "TTF")
datap = CGDataProviderCreateWithFilename(fontpath.UTF8String())
self.font = CGFontCreateWithDataProvider(datap)
#CGDataProviderRelease(datap)
self.initialized = YES
Graphic.__init__(self, rect)
def draw(self,c):
length = len(self.string)
glyphs = objc.allocateBuffer(length)
chars = objc.allocateBuffer(length + 1)
self.string.getCString_maxLength_encoding_(chars, length + 1, NSASCIIStringEncoding)
for i in range(length):
glyphs[i] = chr(ord(chars[i]) - 29)
CGContextSaveGState(c)
CGContextSetFont(c, self.font)
CGContextSetFontSize(c, self.size)
CGContextSetRGBFillColor(c, 0, 0, 0, 1)
CGContextSetRGBStrokeColor (c, 0, 0, 0, 1)
CGContextSetTextMatrix (c, self.xform)
CGContextShowGlyphsAtPoint(c, 0, 0, glyphs, length)
CGContextRestoreGState(c)
Getting this error:
CGContextShowGlyphsAtPoint(c, 0, 0, glyphs, length)
ValueError: depythonifying 'unsigned short', got 'str'
Can anybody point me in the right direction in how to properly prepare a data structure to pass to the CGContextShowGlyphsAtPoint(..) function. Can I use ctypes?
Any help appreciated. Thanks.
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