from Quartz import * import Utilities import sys def scalePatternPhase(phase): # Adjust the pattern phase if scaling to export as bits. This is equivalent to scaling base # space by the scaling factor. patternScaling = Utilities.getScalingFactor() if patternScaling != 1.0: phase = CGSizeApplyAffineTransform(phase, CGAffineTransformMakeScale(patternScaling, patternScaling)) return phase def scalePatternMatrix(patternTransform): # Scale the pattern by the scaling factor when exporting to bits. This is equivalent to # scaling base space by the scaling factor. patternScaling = Utilities.getScalingFactor() if patternScaling != 1.0: patternTransform = CGAffineTransformConcat(patternTransform, CGAffineTransformMakeScale(patternScaling, patternScaling)) return patternTransform def myDrawRedBlackCheckerBoardPattern(info, patternCellContext): # This pattern proc draws a red and a black rectangle # patch representing the minimum cell needed to paint a # checkerboard with that pattern. # # Each 'cell' of the checkerboard is 2 units on a side. # # This code uses CGColorRefs which are available in Panther # and later only. Patterns are available in all versions of # Mac OS X but this code uses CGColorRefs for convenience # and efficiency. # Paint a black checkerboard box. CGContextSetFillColorWithColor(patternCellContext, Utilities.getRGBOpaqueBlackColor()) # This is a 1x1 unit rect whose origin is at 0,0 in pattern space. CGContextFillRect(patternCellContext, CGRectMake(0.0, 0.0, 1.0, 1.0)) # This is a 1x1 unit rect whose origin is at 1,1 in pattern space. CGContextFillRect(patternCellContext, CGRectMake(1.0, 1.0, 1.0, 1.0)) # Paint a red checkerboard box. CGContextSetFillColorWithColor(patternCellContext, Utilities.getRGBOpaqueRedColor()) # This is a 1x1 unit rect whose origin is at 1,0 in pattern space, # that is, immediately to the right of first black checkerboard box. CGContextFillRect(patternCellContext, CGRectMake(1.0, 0.0, 1.0, 1.0)) # This is a 1x1 unit rect whose origin is at 0,1 in pattern space, # that is, immediately above the first black checkerboard box. CGContextFillRect(patternCellContext, CGRectMake(0.0, 1.0, 1.0, 1.0)) def createRedBlackCheckerBoardPattern(patternTransform): pattern = CGPatternCreate(None, # The pattern cell origin is at (0,0) with a # width of 2 units and a height of 2 units. CGRectMake(0, 0, 2, 2), # Use the pattern transform supplied to this routine. scalePatternMatrix(patternTransform), # In pattern space the xStep is 2 units to the next cell in x # and the yStep is 2 units to the next row of cells in y. 2, 2, # This value is a good choice for this type of pattern and it # avoids seams between tiles. kCGPatternTilingConstantSpacingMinimalDistortion, # This pattern has intrinsic color. True, ( myDrawRedBlackCheckerBoardPattern, None )) return pattern def doRedBlackCheckerboard(context): dash = [4] pattern = createRedBlackCheckerBoardPattern( CGAffineTransformMakeScale(20, 20)) if pattern is None: print >>sys.stderr, "Couldn't create pattern!" return # Create the pattern color space. Since the pattern # itself has intrinsic color, the 'baseColorSpace' parameter # to CGColorSpaceCreatePattern must be None. patternColorSpace = CGColorSpaceCreatePattern(None) CGContextSetFillColorSpace(context, patternColorSpace) # The pattern has intrinsic color so the color components array # passed to CGContextSetFillPattern is just the alpha value used # to composite the pattern cell. # Paint the pattern with alpha = 1. color = [1.0] # Set the fill color to the checkerboard pattern. CGContextSetFillPattern(context, pattern, color) # Fill a 100x100 unit rect at (20,20). CGContextFillRect(context, CGRectMake(20, 20, 100, 100)) # Save the graphics state before changing the stroke color. CGContextSaveGState(context) if 1: # Set the stroke color space and color to the pattern. CGContextSetStrokeColorSpace(context, patternColorSpace) CGContextSetStrokePattern(context, pattern, color) # Stroke an ellipse with the pattern. CGContextSetLineWidth(context, 8) CGContextBeginPath(context) Utilities.myCGContextAddEllipseInRect(context, CGRectMake(120, 20, 50, 100)) CGContextStrokePath(context) # Restore to the graphics state without the # pattern stroke color. CGContextRestoreGState(context) # Now draw text. CGContextSetTextMatrix(context, CGAffineTransformIdentity) # Choose the font with the PostScript name "Times-Roman", # size 80 points, with the encoding MacRoman encoding. CGContextSelectFont(context, "Times-Roman", 80, kCGEncodingMacRoman) # Using the fill text drawing mode. CGContextSetTextDrawingMode(context, kCGTextFill) # Draw text with the pattern. CGContextShowTextAtPoint(context, 20, 120, "Text", 4) # Rectangle 1, filled. CGContextFillRect(context, CGRectMake(200, 20, 90, 90)) # Rectangle 2, filled and stroked with a dash. CGContextSetLineWidth(context, 2) CGContextSetLineDash(context, 0, dash, 1) CGContextBeginPath(context) CGContextAddRect(context, CGRectMake(200, 70, 90, 90)) CGContextDrawPath(context, kCGPathFillStroke) def doPatternMatrix(context): basePatternMatrix = CGAffineTransformMakeScale(20, 20) pattern = createRedBlackCheckerBoardPattern(basePatternMatrix) if pattern is None: print >>sys.stderr, "Couldn't create pattern!" return # Create the pattern color space. Since the pattern # itself has intrinsic color, the 'baseColorSpace' parameter # to CGColorSpaceCreatePattern must be None. patternColorSpace = CGColorSpaceCreatePattern(None) CGContextSetFillColorSpace(context, patternColorSpace) del patternColorSpace CGContextTranslateCTM(context, 40, 40) CGContextSetPatternPhase(context, scalePatternPhase(CGSize(40, 40))) # The pattern has intrinsic color so the color components array # passed to CGContextSetFillPattern is the alpha value used # to composite the pattern cell. # Paint the pattern first with alpha = 1. color = [1] CGContextSetFillPattern(context, pattern, color) # Rectangle 1. CGContextFillRect(context, CGRectMake(0, 0, 100, 100)) CGContextSaveGState(context) if 1: # Rectangle 2. # Paint the pattern with 65% alpha. color = [0.65] CGContextSetFillPattern(context, pattern, color) # Rotate 45 degrees about the point (150, 50). CGContextTranslateCTM(context, 150.0, 50.0) CGContextRotateCTM(context, Utilities.DEGREES_TO_RADIANS(45.0)) CGContextTranslateCTM(context, -50.0, -50.0) # Rectangle 2. Patterns do not translate, scale or # rotate with the CTM. You can see that the pattern # tile of this filled rectangle is that of Rectangle # 1. CGContextFillRect(context, CGRectMake(0, 0, 100, 100)) # Release the pattern. del pattern CGContextRestoreGState(context) CGContextSaveGState(context) if 1: # Rectangle 3. The pattern is rotated with the object. # Rotate 45 degrees about the point 250, 50. t = CGAffineTransformMakeTranslation(250.0, 50.0) t = CGAffineTransformRotate(t, Utilities.DEGREES_TO_RADIANS(45.0)) # Translate back to -50, -50. t = CGAffineTransformTranslate(t, -50.0, -50.0) CGContextConcatCTM(context, t) # Make a new pattern that is equivalent to # the old pattern but transformed to current user # space. The order of transformations is crucial. # This ordering is equivalent to using the same pattern # matrix as before but transforming base space by t. patTransform = CGAffineTransformConcat(basePatternMatrix, t) pattern = createRedBlackCheckerBoardPattern(patTransform) color = [1] CGContextSetFillPattern(context, pattern, color) # Release the pattern. del pattern CGContextFillRect(context, CGRectMake(0, 0, 100, 100)) CGContextRestoreGState(context) CGContextSaveGState(context) if 1: # Rectangle 4. The pattern is scaled with the object. # Translate and scale. t = CGAffineTransformMakeTranslation(320, 0) t = CGAffineTransformScale(t, 2, 2) CGContextConcatCTM(context, t) # Make a new pattern that is equivalent to # the old pattern but transformed to current user # space. The order of transformations is crucial. # This ordering is equivalent to using the same pattern # matrix as before but transforming base space by t. patTransform = CGAffineTransformConcat(basePatternMatrix, t) pattern = createRedBlackCheckerBoardPattern(patTransform) color = [1] CGContextSetFillPattern(context, pattern, color) # Release the pattern. del pattern CGContextFillRect(context, CGRectMake(0, 0, 100, 100)) CGContextRestoreGState(context) def doPatternPhase(context): pattern = createRedBlackCheckerBoardPattern( CGAffineTransformMakeScale(20, 20)) if pattern is None: print >>sys.stderr, "Couldn't create pattern!" return # Create the pattern color space for a colored pattern. patternColorSpace = CGColorSpaceCreatePattern(None) CGContextSetFillColorSpace(context, patternColorSpace) # Paint the pattern with alpha = 1. color = (1,) CGContextSetFillPattern(context, pattern, color) # Rectangle 1 CGContextFillRect(context, CGRectMake(20, 150, 100, 100)) # Rectangle 2 CGContextFillRect(context, CGRectMake(130, 150, 100, 100)) # Rectangle 3 # Set the pattern phase so that the pattern origin # is at the lower-left of the shape. CGContextSetPatternPhase(context, scalePatternPhase( CGSizeMake(20, 20) )) CGContextFillRect(context, CGRectMake(20, 20, 100, 100)) # Rectangle 4 # Set the pattern phase so that the pattern origin # is at the lower-left corner of the shape. CGContextSetPatternPhase(context, scalePatternPhase( CGSizeMake(130, 20) )) CGContextTranslateCTM(context, 130, 20) CGContextFillRect(context, CGRectMake(0, 0, 100, 100)) def drawRotatedRect(c, p): r = CGRectMake(0, 0, 1, 1) CGContextSaveGState(c) if 1: CGContextTranslateCTM(c, p.x, p.y) CGContextRotateCTM(c, Utilities.DEGREES_TO_RADIANS(45)) CGContextTranslateCTM(c, -r.size.width/2, -r.size.height/2) CGContextFillRect(c, r) CGContextRestoreGState(c) def myStencilPatternProc(info, patternCellContext): drawRotatedRect(patternCellContext, CGPointMake(1, 1)) drawRotatedRect(patternCellContext, CGPointMake(1.75, 1)) def createStencilPattern(patternTransform): pattern = CGPatternCreate(None, # The pattern cell origin is at (0,0) with a # width of 2.5 units and a height of 2 units. This # pattern cell has transparent areas since # the pattern proc only marks a portion of the cell. CGRectMake(0, 0, 2.5, 2), # Use the pattern transform supplied to this routine. scalePatternMatrix(patternTransform), # Use the width and height of the pattern cell for # the xStep and yStep. 2.5, 2, # This value is a good choice for this type of pattern and it # avoids seams between tiles. kCGPatternTilingConstantSpacingMinimalDistortion, # This pattern does not have intrinsic color. False, # Must be False for a stencil pattern. ( myStencilPatternProc, None, )) return pattern def doStencilPattern(context): pattern = createStencilPattern(CGAffineTransformMakeScale(20, 20)) if pattern is None: print >>sys.stderr, "Couldn't create pattern!" return # Create the pattern color space. This pattern is a stencil # pattern so when the code sets the pattern it also sets the # color it will paint the pattern with. In order to # set the pattern color space in this case we also have # to say what underlying color space should be used when # the pattern proc is called. baseColorSpace = Utilities.getTheCalibratedRGBColorSpace() patternColorSpace = CGColorSpaceCreatePattern(baseColorSpace) CGContextSetFillColorSpace(context, patternColorSpace) # This code is finished with the pattern color space and can release # it because Quartz retains it while it is the current color space. del patternColorSpace # The pattern has no intrinsic color so the color components array # passed to CGContextSetFillPattern contains the colors to paint # the pattern with in the baseColorSpace. In the case here, # first paint the pattern with opaque blue. color = (0.11, 0.208, 0.451, 1.0) CGContextSetFillPattern(context, pattern, color) # Rectangle 1. CGContextSetPatternPhase(context, scalePatternPhase( CGSizeMake(20, 160) )) CGContextBeginPath(context) CGContextAddRect(context, CGRectMake(20, 160, 105, 80)) CGContextDrawPath(context, kCGPathFillStroke) # Rectangle 2. # Set the pattern color so the stencil pattern # is painted in a yellow shade. color = (1.0, 0.816, 0.0, 1.0) CGContextSetFillPattern(context, pattern, color) # Set the pattern phase to the origin of the next object. CGContextSetPatternPhase(context, scalePatternPhase( CGSizeMake(140, 160) )) CGContextBeginPath(context) CGContextAddRect(context, CGRectMake(140, 160, 105, 80)) CGContextDrawPath(context, kCGPathFillStroke) CGContextSaveGState(context) if 1: CGContextSetFillColorWithColor(context, Utilities.getRGBOpaqueBlueColor()) # Fill color is now blue. Paint two blue rectangles # that will be underneath the drawing which follows. CGContextFillRect(context, CGRectMake(20, 40, 105, 80)) CGContextFillRect(context, CGRectMake(140, 40, 105, 80)) CGContextRestoreGState(context) # The fill color is again the stencil pattern with # the underlying fill color an opaque yellow. # Rectangle 3. # This paints over the blue rect just painted at 20,40 # and the blue underneath is visible where the pattern has # transparent areas. CGContextSetPatternPhase(context, scalePatternPhase( CGSizeMake(20, 40) )) CGContextFillRect(context, CGRectMake(20, 40, 105, 80)) # Rectangle 4. # Change the alpha value of the underlying color used # to paint the stencil pattern. color = list(color) color[3] = 0.75 CGContextSetFillPattern(context, pattern, color) CGContextSetPatternPhase(context, scalePatternPhase( CGSizeMake(140, 40) )) CGContextFillRect(context, CGRectMake(140, 40, 105, 80)) class MyPDFPatternInfo (object): rect = None pdfDoc = None def myDrawPDFPattern(info, patternCellContext): # This pattern proc draws the first page of a PDF document to # a destination rect. CGContextSaveGState(patternCellContext) CGContextClipToRect(patternCellContext, info.rect) CGContextDrawPDFDocument(patternCellContext, info.rect, info.pdfDoc, 1) CGContextRestoreGState(patternCellContext) # Versions of Tiger prior to 10.4.3 have a bug such that use of an xStep that # doesn't match the width of pattern bounding box or a yStep that doesn't match the # height of the pattern bounding box produces incorrect results when drawn # to a bit-based context. Setting TIGERSTEPWORKAROUND works around this bug. TIGERSTEPWORKAROUND=1 SCALEPATTERN=1 OPTIMIZEDPERF=0 def createPDFPatternPattern(additionalTransformP, url): patternInfoP = MyPDFPatternInfo() patternInfoP.pdfDoc = CGPDFDocumentCreateWithURL(url) if patternInfoP.pdfDoc is None: print >>sys.stderr, "Couldn't create PDF document reference!" return patternInfoP.rect = CGPDFDocumentGetMediaBox(patternInfoP.pdfDoc, 1) # Set the origin of the media rect for the PDF document to (0,0). patternInfoP.rect.origin = CGPointZero if additionalTransformP is not None: patternTransform = additionalTransformP else: patternTransform = CGAffineTransformIdentity # To emulate the example from the bitmap context drawing chapter, # the tile offset in each dimension is the tile size in that # dimension, plus 6 units. if SCALEPATTERN: tileOffsetX = 6. + patternInfoP.rect.size.width tileOffsetY = 6. + patternInfoP.rect.size.height else: tileOffsetX = 2. + patternInfoP.rect.size.width tileOffsetY = 2. + patternInfoP.rect.size.height # Tiger versions 10.4.0 - 10.4.2 have a bug such that the bounds # width and height is incorrectly used as the xstep,ystep. # To workaround this bug, we can make the bounds rect incorporate # the xstep,ystep since xstep,ystep are larger than the bounds. if OPTIMIZEDPERF or TIGERSTEPWORKAROUND: patternRect = CGRectMake(0, 0, tileOffsetX, tileOffsetY) else: patternRect = patternInfoP.rect if OPTIMIZEDPERF: # Produces best performance if bbox == xstep/ystep spacing = kCGPatternTilingConstantSpacing else: spacing = kCGPatternTilingConstantSpacingMinimalDistortion pattern = CGPatternCreate(patternInfoP, # The pattern cell size is the size # of the media rect of the PDF document. patternRect, scalePatternMatrix(patternTransform), tileOffsetX, tileOffsetY, # This value is a good choice for this type of pattern and # it avoids seams between tiles. spacing, # This pattern has intrinsic color. True, ( myDrawPDFPattern, None, )) # If the pattern can't be created then release the # pattern resources and info parameter. if pattern is None: patternInfoP = None return pattern def drawWithPDFPattern(context, url): if SCALEPATTERN: patternMatrix = CGAffineTransformMakeScale(1.0/3, 1.0/3) else: patternMatrix = CGAffineTransformMakeScale(1, 1) # Scale the PDF pattern down to 1/3 its original size. pdfPattern = createPDFPatternPattern(patternMatrix, url) if pdfPattern is None: print >>sys.stderr, "Couldn't create pattern!" return # Create the pattern color space. Since the pattern # itself has intrinsic color, the 'baseColorSpace' parameter # to CGColorSpaceCreatePattern must be None. patternColorSpace = CGColorSpaceCreatePattern(None) CGContextSetFillColorSpace(context, patternColorSpace) # Quartz retains the color space so this code # can now release it since it no longer needs it. del patternColorSpace # Paint the pattern with an alpha of 1. color = (1,) CGContextSetFillPattern(context, pdfPattern, color) # Quartz retains the pattern so this code # can now release it since it no longer needs it. del pdfPattern # Fill a US Letter size rect with the pattern. CGContextFillRect(context, CGRectMake(0, 0, 612, 792))