from Quartz import * import Quartz import Utilities import sys def drawQuartzRomanText(context): text = "Quartz" textlen = len(text) fontSize = 60 opaqueBlack = [0.0, 0.0, 0.0, 1.0] opaqueRed = [0.663, 0.0, 0.031, 1.0] # Set the fill color space. This sets the # fill painting color to opaque black. CGContextSetFillColorSpace(context, Utilities.getTheCalibratedRGBColorSpace()) # The Cocoa framework calls the draw method with an undefined # value of the text matrix. It's best to set it to what is needed by # this code: the identity transform. CGContextSetTextMatrix(context, CGAffineTransformIdentity) # Set the font with the PostScript name "Times-Roman", at # fontSize points, with the MacRoman encoding. CGContextSelectFont(context, "Times-Roman", fontSize, kCGEncodingMacRoman) # The default text drawing mode is fill. Draw the text at (70, 400). CGContextShowTextAtPoint(context, 70, 400, text, textlen) # Set the fill color to red. CGContextSetFillColor(context, opaqueRed) # Draw the next piece of text where the previous one left off. CGContextShowText(context, text, textlen) for i in range(3): # Get the current text pen position. p = CGContextGetTextPosition(context) # Translate to the current text pen position. CGContextTranslateCTM(context, p.x, p.y) # Rotate clockwise by 90 degrees for the next # piece of text. CGContextRotateCTM(context, Utilities.DEGREES_TO_RADIANS(-90)) # Draw the next piece of text in blac at the origin. CGContextSetFillColor(context, opaqueBlack) CGContextShowTextAtPoint(context, 0, 0, text, textlen) # Draw the next piece of text where the previous piece # left off and paint it with red. CGContextSetFillColor(context, opaqueRed) CGContextShowText(context, text, textlen) def myCGContextStrokeLineSegments(context, s, count): # CGContextStrokeLineSegments is available only on Tiger and later # so if it isn't available, use an emulation of # CGContextStrokeLineSegments. It is better to use the # built-in CGContextStrokeLineSegments since it has significant # performance optimizations on some hardware. if hasattr(Quartz, 'CGContextStrokeLineSegments'): CGContextStrokeLineSegments(context, s, count) else: CGContextBeginPath(context) for k in xrange(0, count, 2): CGContextMoveToPoint(context, s[k].x, s[k].y) CGContextAddLineToPoint(context, s[k+1].x, s[k+1].y) CGContextStrokePath(context) _gridLines = [] def drawGridLines(context): numlines = 60 if not _gridLines: stepsize = 4.0 val = 0 for i in xrange(0, 2*numlines, 2): _gridLines.append(CGPointMake(val, -60)) _gridLines.append(CGPointMake(val, 200)) val += stepsize val = -20 for i in xrange(2*numlines, 4*numlines, 2): _gridLines.append(CGPointMake(0, val)) _gridLines.append(CGPointMake(400, val)) val += stepsize myCGContextStrokeLineSegments(context, _gridLines, len(_gridLines)) def drawQuartzTextWithTextModes(context): fillText = "Fill " strokeText = "Stroke " fillAndStrokeText = "FillStroke " invisibleText = "Invisible " clipText = "ClipText " fillStrokeClipText = "FillStrokeClip " fontSize = 40.0 extraLeading = 5.0 dash = (1,1) opaqueRed = (1.0, 0.0, 0.0, 1.0) # Set the fill and stroke color space. This sets the # fill and stroke painting color to opaque black. CGContextSetFillColorSpace(context, Utilities.getTheCalibratedRGBColorSpace()) CGContextSetStrokeColorSpace(context, Utilities.getTheCalibratedRGBColorSpace()) # The Cocoa framework calls the draw method with an undefined # value of the text matrix. It's best to set it to what is needed by # this code: the identity transform. CGContextSetTextMatrix(context, CGAffineTransformIdentity) # Set the font with the PostScript name "Times-Roman", at # fontSize points, with the MacRoman encoding. CGContextSelectFont(context, "Times-Roman", fontSize, kCGEncodingMacRoman) # ---- Text Line 1 ---- # Default text drawing mode is fill. Draw the text at (10, 400). CGContextShowTextAtPoint(context, 10, 400, fillText, len(fillText)) # Set the fill color to red. CGContextSetFillColor(context, opaqueRed) CGContextSetTextPosition(context, 180, 400) CGContextShowText(context, fillText, len(fillText)) # Translate down for the next line of text. CGContextTranslateCTM(context, 0, -(fontSize + extraLeading)) # ---- Text Line 2 ---- # Now stroke the text by setting the text drawing mode # to kCGTextStroke. When stroking text, Quartz uses the stroke # color in the graphics state. CGContextSetTextDrawingMode(context, kCGTextStroke) CGContextShowTextAtPoint(context, 10, 400, strokeText, len(strokeText)) # When stroking text, the line width and other gstate parameters # that affect stroking affect text stroking as well. CGContextSetLineWidth(context, 2) CGContextSetLineDash(context, 0, dash, 2) CGContextSetTextPosition(context, 180, 400) CGContextShowText(context, strokeText, len(strokeText)) # Reset the line dash and line width to their defaults. CGContextSetLineDash(context, 0, None, 0) CGContextSetLineWidth(context, 1) # Translate down for the next line of text. CGContextTranslateCTM(context, 0, -(fontSize + extraLeading)) # ---- Text Line 3 ---- # Set the text drawing mode so that text is both filled and # stroked. This produces text that is filled with the fill # color and stroked with the stroke color. CGContextSetTextDrawingMode(context, kCGTextFillStroke) CGContextShowTextAtPoint(context, 10, 400, fillAndStrokeText, len(fillAndStrokeText)) # Now draw again with a thicker stroke width. CGContextSetLineWidth(context, 2) CGContextSetTextPosition(context, 180, 400) CGContextShowText(context, fillAndStrokeText, len(fillAndStrokeText)) CGContextSetLineWidth(context, 1) CGContextTranslateCTM(context, 0, -(fontSize + extraLeading)) # ---- Text Line 4 ---- # Set the text drawing mode to invisible so that the next piece of # text does not appear. Quartz updates the text position as # if it had been drawn. CGContextSetTextDrawingMode(context, kCGTextInvisible) CGContextShowTextAtPoint(context, 10, 400, invisibleText, len(invisibleText)) CGContextSetTextDrawingMode(context, kCGTextFill) CGContextSetTextPosition(context, 180, 400) CGContextShowText(context, fillText, len(fillText)) CGContextTranslateCTM(context, 0, -(fontSize + extraLeading)) # ---- Text Line 5 ---- CGContextSaveGState(context) if 1: # Use the text as a clipping path. CGContextSetTextDrawingMode(context, kCGTextClip) CGContextShowTextAtPoint(context, 10, 400, clipText, len(clipText)) # Position and draw a grid of lines. CGContextTranslateCTM(context, 10, 400) drawGridLines(context) CGContextRestoreGState(context) CGContextSaveGState(context) if 1: # The current text position is that after the last piece # of text has been drawn. Since CGContextSaveGState/ # CGContextRestoreGState do not affect the text position or # the text matrix, the text position is that after the last # text was "drawn", that drawn with the kCGTextClip mode # above. This is where the next text drawn will go if it # isn't explicitly positioned. nextTextPosition = CGContextGetTextPosition(context) # Draw so that the text is filled, stroked, and then used # the clip subsequent drawing. CGContextSetTextDrawingMode(context, kCGTextFillStrokeClip) # Explicitly set the text position. CGContextSetTextPosition(context, 180, 400) nextTextPosition = CGContextGetTextPosition(context) CGContextShowText(context, fillStrokeClipText, len(fillStrokeClipText)) # Adjust the location of the grid lines so that they overlap the # text just drawn. CGContextTranslateCTM(context, nextTextPosition.x, nextTextPosition.y) # Draw the grid lines clipped by the text. drawGridLines(context) CGContextRestoreGState(context) # showFlippedTextAtPoint is a cover routine for CGContextShowText # that is useful for drawing text in a coordinate system where the y axis # is flipped relative to the default Quartz coordinate system. # # This code assumes that the text matrix is only used to # flip the text, not to perform scaling or any other # possible use of the text matrix. # # This function preserves the a, b, c, and d components of # the text matrix across its execution but updates the # tx, ty components (the text position) to reflect the # text just drawn. If all the text you draw is flipped, it # isn't necessary to continually set the text matrix. Instead # you could simply call CGContextSetTextMatrix once with # the flipped matrix each time your drawing # code is called. def showFlippedTextAtPoint(c, x, y, text, textLen): t = CGAffineTransform(1.0, 0.0, 0.0, -1.0, 0.0, 0.0) # Get the existing text matrix. s = CGContextGetTextMatrix(c) # Set the text matrix to the one that flips in y. CGContextSetTextMatrix(c, t) # Draw the text at the point. CGContextShowTextAtPoint(c, x, y, text, textLen) # Get the updated text position. p = CGContextGetTextPosition(c) # Update the saved text matrix to reflect the updated # text position. s.tx = p.x ; s.ty = p.y # Reset to the text matrix in effect when this # routine was called but with the text position updated. CGContextSetTextMatrix(c, s) def drawQuartzTextWithTextMatrix(context): fontSize = 60.0 extraLeading = 10.0 text = "Quartz " textlen = len(text) # The Cocoa framework calls the draw method with an undefined # value of the text matrix. It's best to set it to what is needed by # this code. Initially that is the identity transform. CGContextSetTextMatrix(context, CGAffineTransformIdentity) # Set the font with the PostScript name "Times-Roman", at # fontSize points, with the MacRoman encoding. CGContextSelectFont(context, "Times-Roman", fontSize, kCGEncodingMacRoman) # ---- Text Line 1 ---- # Draw the text at (10, 600). CGContextShowTextAtPoint(context, 10, 600, text, textlen) # Get the current text position. The text pen is at the trailing # point from the text just drawn. textPosition = CGContextGetTextPosition(context) # Set the text matrix to one that flips text in y and sets # the text position to the user space coordinate (0,0). t = CGAffineTransformMake(1, 0, 0, -1, 0, 0) CGContextSetTextMatrix(context, t) # Set the text position to the point where the previous text ended. CGContextSetTextPosition(context, textPosition.x, textPosition.y) # Draw the text at the current text position. It will be drawn # flipped in y, relative to the text drawn previously. CGContextShowText(context, text, textlen) # ---- Text Line 2 ---- # Translate down for the next piece of text. CGContextTranslateCTM(context, 0, -(3*fontSize + extraLeading)) CGContextSaveGState(context) if 1: # Change the text matrix to {1, 0, 0, 3, 0, 0}, which # scales text by a factor of 1 in x and 3 in y. # This scaling doesn't affect any drawing other than text # drawing since only text drawing is transformed by # the text matrix. t = CGAffineTransformMake(1, 0, 0, 3, 0, 0) CGContextSetTextMatrix(context, t) # This text is scaled relative to the previous text # because of the text matrix scaling. CGContextShowTextAtPoint(context, 10, 600, text, textlen) # This restores the graphics state to what it was at the time # of the last CGContextSaveGState, but since the text matrix # isn't part of the Quartz graphics state, it isn't affected. CGContextRestoreGState(context) # The text matrix isn't affected by CGContextSaveGState and # CGContextRestoreGState. You can see this by observing that # the next text piece appears immediately after the first piece # and with the same text scaling as that text drawn with the # text matrix established before we did CGContextRestoreGState. CGContextShowText(context, text, textlen) # ---- Text Line 3 ---- # Translate down for the next piece of text. CGContextTranslateCTM(context, 0, -(fontSize + extraLeading)) # Reset the text matrix to the identity matrix. CGContextSetTextMatrix(context, CGAffineTransformIdentity) # Now draw text in a flipped coordinate system. CGContextSaveGState(context) if 1: # Flip the coordinate system to mimic a coordinate system with the origin # at the top-left corner of a window. The new origin is at 600 units in # +y from the old origin and the y axis now increases with positive y # going down the window. CGContextConcatCTM(context, CGAffineTransformMake(1, 0, 0, -1, 0, 600)) # This text will be flipped along with the CTM. CGContextShowTextAtPoint(context, 10, 10, text, textlen) # Obtain the user space coordinates of the current text position. textPosition = CGContextGetTextPosition(context) # Draw text at that point but flipped in y. showFlippedTextAtPoint(context, textPosition.x, textPosition.y, text, textlen) CGContextRestoreGState(context)