reportlab/platypus/figures.py
author rgbecker
Wed, 07 Jan 2004 16:36:34 +0000
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#copyright ReportLab Inc. 2000
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#see license.txt for license details
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#history http://cvs.sourceforge.net/cgi-bin/cvsweb.cgi/docs/tools/platdemos.py?cvsroot=reportlab
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#$Header: /tmp/reportlab/reportlab/platypus/figures.py,v 1.15 2004/01/07 16:36:34 rgbecker Exp $
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"""This includes some demos of platypus for use in the API proposal"""
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__version__=''' $Id: figures.py,v 1.15 2004/01/07 16:36:34 rgbecker Exp $ '''
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import os
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from reportlab.lib import colors
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from reportlab.pdfgen.canvas import Canvas
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from reportlab.lib.styles import ParagraphStyle
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from reportlab.lib.utils import recursiveImport
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from reportlab.platypus import Frame
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from reportlab.platypus import Flowable
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from reportlab.platypus import Paragraph
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from reportlab.lib.units import inch
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from reportlab.lib.enums import TA_LEFT, TA_RIGHT, TA_CENTER
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from reportlab.lib.validators import isColor
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from reportlab.lib.colors import toColor
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captionStyle = ParagraphStyle('Caption', fontName='Times-Italic', fontSize=10, alignment=TA_CENTER)
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class Figure(Flowable):
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    def __init__(self, width, height, caption="",
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                 captionFont="Times-Italic", captionSize=12, background=None,
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                 captionTextColor=toColor('black'),
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                 captionBackColor=None):
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        Flowable.__init__(self)
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        self.width = width
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        self.figureHeight = height
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        self.caption = caption
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        self.captionFont = captionFont
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        self.captionSize = captionSize
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        self.captionTextColor = captionTextColor
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        self.captionBackColor = captionBackColor
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        self._captionData = None
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        self.captionHeight = 0  # work out later
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        self.background = background
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        self.spaceBefore = 12
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        self.spaceAfter = 12
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    def _getCaptionPara(self):
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        caption = self.caption
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        captionFont = self.captionFont
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        captionSize = self.captionSize
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        captionTextColor = self.captionTextColor
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        captionBackColor = self.captionBackColor
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        if self._captionData!=(caption,captionFont,captionSize,captionTextColor,captionBackColor):
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            self._captionData = (caption,captionFont,captionSize,captionTextColor,captionBackColor)
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            self.captionStyle = ParagraphStyle(
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                'Caption',
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                fontName=captionFont,
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                fontSize=captionSize,
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                leading=1.2*captionSize,
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                textColor = captionTextColor,
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                backColor = captionBackColor,
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                spaceBefore=captionSize * 0.5,
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                alignment=TA_CENTER)
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            #must build paragraph now to get sequencing in synch with rest of story
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            self.captionPara = Paragraph(self.caption, self.captionStyle)
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    def wrap(self, availWidth, availHeight):
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        # try to get the caption aligned
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        if self.caption:
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            self._getCaptionPara()
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            (w, h) = self.captionPara.wrap(self.width, availHeight - self.figureHeight)
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            self.captionHeight = h
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            self.height = self.captionHeight + self.figureHeight
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            if w>self.width: self.width = w
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        else:
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            self.height = self.figureHeight
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        self.dx = 0.5 * (availWidth - self.width)
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        return (self.width, self.height)
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    def draw(self):
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        self.canv.translate(self.dx, 0)
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        if self.caption:
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            self._getCaptionPara()
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            self.drawCaption()
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            self.canv.translate(0, self.captionHeight)
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        if self.background:
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            self.drawBackground()
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        self.drawBorder()
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        self.drawFigure()
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    def drawBorder(self):
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        self.canv.rect(0, 0, self.width, self.figureHeight)
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    def _doBackground(self, color):
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        self.canv.saveState()
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        self.canv.setFillColor(self.background)
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        self.canv.rect(0, 0, self.width, self.figureHeight, fill=1)
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        self.canv.restoreState()
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    def drawBackground(self):
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        """For use when using a figure on a differently coloured background.
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        Allows you to specify a colour to be used as a background for the figure."""
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        if isColor(self.background):
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            self._doBackground(self.background)
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        else:
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            try:
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                c = toColor(self.background)
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                self._doBackground(c)
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            except:
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                pass
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    def drawCaption(self):
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        self.captionPara.drawOn(self.canv, 0, 0)
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    def drawFigure(self):
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        pass
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def drawPage(canvas,x, y, width, height):
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    #draws something which looks like a page
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    pth = canvas.beginPath()
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    corner = 0.05*width
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    # shaded backdrop offset a little
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    canvas.setFillColorRGB(0.5,0.5,0.5)
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    canvas.rect(x + corner, y - corner, width, height, stroke=0, fill=1)
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    #'sheet of paper' in light yellow
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    canvas.setFillColorRGB(1,1,0.9)
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    canvas.setLineWidth(0)
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    canvas.rect(x, y, width, height, stroke=1, fill=1)
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    #reset
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    canvas.setFillColorRGB(0,0,0)
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    canvas.setStrokeColorRGB(0,0,0)
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class PageFigure(Figure):
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    """Shows a blank page in a frame, and draws on that.  Used in
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    illustrations of how PLATYPUS works."""
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    def __init__(self, background=None):
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        Figure.__init__(self, 3*inch, 3*inch)
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        self.caption = 'Figure 1 - a blank page'
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        self.captionStyle = captionStyle
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        self.background = background
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    def drawVirtualPage(self):
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        pass
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    def drawFigure(self):
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        drawPage(self.canv, 0.625*inch, 0.25*inch, 1.75*inch, 2.5*inch)
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        self.canv.translate(0.625*inch, 0.25*inch)
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        self.canv.scale(1.75/8.27, 2.5/11.69)
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        self.drawVirtualPage()
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class PlatPropFigure1(PageFigure):
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    """This shows a page with a frame on it"""
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    def __init__(self):
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        PageFigure.__init__(self)
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        self.caption = "Figure 1 - a page with a simple frame"
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    def drawVirtualPage(self):
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        demo1(self.canv)
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class FlexFigure(Figure):
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    """Base for a figure class with a caption. Can grow or shrink in proportion"""
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    def __init__(self, width, height, caption, background=None):
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        Figure.__init__(self, width, height, caption,
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                        captionFont="Helvetica-Oblique", captionSize=8,
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                        background=None)
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        self.shrinkToFit = 1 #if set and wrap is too tight, shrinks
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        self.growToFit = 1 #if set and wrap is too tight, shrinks
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        self.scaleFactor = None
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        self.captionStyle = ParagraphStyle(
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            'Caption',
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            fontName='Times', #'Helvetica-Oblique',
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            fontSize=4, #8, 
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            spaceBefore=9, #3,
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            alignment=TA_CENTER
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            )
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        self._scaleFactor = None
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        self.background = background
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    def _scale(self,availWidth,availHeight):
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        "Rescale to fit according to the rules, but only once"
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        if self._scaleFactor is None or self.width>availWidth or self.height>availHeight:
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            w, h = Figure.wrap(self, availWidth, availHeight)
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            captionHeight = h - self.figureHeight
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            if self.scaleFactor is None:
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                #scale factor None means auto
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                self._scaleFactor = min(availWidth/self.width,(availHeight-captionHeight)/self.figureHeight)
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            else: #they provided a factor
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                self._scaleFactor = self.scaleFactor
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            if self._scaleFactor<1 and self.shrinkToFit:
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                self.width = self.width * self._scaleFactor - 0.0001
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                self.figureHeight = self.figureHeight * self._scaleFactor
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            elif self._scaleFactor>1 and self.growToFit:
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                self.width = self.width*self._scaleFactor - 0.0001
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                self.figureHeight = self.figureHeight * self._scaleFactor
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    def wrap(self, availWidth, availHeight):
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        self._scale(availWidth,availHeight)
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        return Figure.wrap(self, availWidth, availHeight)
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    def split(self, availWidth, availHeight):
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        self._scale(availWidth,availHeight)
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        return Figure.split(self, availWidth, availHeight)
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class ImageFigure(FlexFigure):
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    """Image with a caption below it"""
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    def __init__(self, filename, caption, background=None):
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        assert os.path.isfile(filename), 'image file %s not found' % filename
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        from reportlab.lib.utils import ImageReader
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        w, h = ImageReader(filename).getSize()
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        self.filename = filename
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        FlexFigure.__init__(self, w, h, caption, background)
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    def drawFigure(self):
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        self.canv.drawInlineImage(self.filename,
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                                  0, 0,self.width, self.figureHeight)
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class DrawingFigure(FlexFigure):
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    """Drawing with a caption below it.  Clunky, scaling fails."""
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    def __init__(self, modulename, classname, caption, baseDir=None, background=None):
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        module = recursiveImport(modulename, baseDir)
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        klass = getattr(module, classname)
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        self.drawing = klass()
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        FlexFigure.__init__(self,
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                            self.drawing.width,
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                            self.drawing.height,
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                            caption,
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                            background)
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        self.growToFit = 1
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    def drawFigure(self):
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        self.canv.scale(self._scaleFactor, self._scaleFactor)
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        self.drawing.drawOn(self.canv, 0, 0)
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try:
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    from rlextra.pageCatcher.pageCatcher import restoreForms, storeForms, storeFormsInMemory, restoreFormsInMemory
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    _hasPageCatcher = 1
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except ImportError:
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    _hasPageCatcher = 0
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if _hasPageCatcher:
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    ####################################################################
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    #
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    #    PageCatcher plugins
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    # These let you use our PageCatcher product to add figures
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    # to other documents easily.
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    ####################################################################
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    class PageCatcherCachingMixIn:
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        "Helper functions to cache pages for figures"
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        def getFormName(self, pdfFileName, pageNo):
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            #naming scheme works within a directory only
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            dirname, filename = os.path.split(pdfFileName)
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            root, ext = os.path.splitext(filename)
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            return '%s_page%d' % (root, pageNo)
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        def needsProcessing(self, pdfFileName, pageNo):
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            "returns 1 if no forms or form is older"
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            formName = self.getFormName(pdfFileName, pageNo)
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            if os.path.exists(formName + '.frm'):
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                formModTime = os.stat(formName + '.frm')[8]
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                pdfModTime = os.stat(pdfFileName)[8]
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                return (pdfModTime > formModTime)
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            else:
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                return 1
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        def processPDF(self, pdfFileName, pageNo):
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            formName = self.getFormName(pdfFileName, pageNo)
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            storeForms(pdfFileName, formName + '.frm',
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                                    prefix= formName + '_',
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                                    pagenumbers=[pageNo])
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            #print 'stored %s.frm' % formName
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            return formName + '.frm'
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    class cachePageCatcherFigureNonA4(FlexFigure, PageCatcherCachingMixIn):
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        """PageCatcher page with a caption below it.  Size to be supplied."""
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        # This should merge with PageFigure into one class that reuses
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        # form information to determine the page orientation...
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        def __init__(self, filename, pageNo, caption, width, height, background=None):
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            self.dirname, self.filename = os.path.split(filename)
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            if self.dirname == '':
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                self.dirname = os.curdir
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            self.pageNo = pageNo
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            self.formName = self.getFormName(self.filename, self.pageNo) + '_' + str(pageNo)
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            FlexFigure.__init__(self, width, height, caption, background)
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        def drawFigure(self):
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            self.canv.saveState()
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            if not self.canv.hasForm(self.formName):
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                restorePath = self.dirname + os.sep + self.filename
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                #does the form file exist?  if not, generate it.
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                formFileName = self.getFormName(restorePath, self.pageNo) + '.frm'
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                if self.needsProcessing(restorePath, self.pageNo):
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                    #print 'preprocessing PDF %s page %s' % (restorePath, self.pageNo)
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                    self.processPDF(restorePath, self.pageNo)
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                names = restoreForms(formFileName, self.canv)
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            self.canv.scale(self._scaleFactor, self._scaleFactor)
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            self.canv.doForm(self.formName)
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            self.canv.restoreState()
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    class cachePageCatcherFigure(cachePageCatcherFigureNonA4):
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        """PageCatcher page with a caption below it.  Presumes A4, Portrait.
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        This needs our commercial PageCatcher product, or you'll get a blank."""
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        def __init__(self, filename, pageNo, caption, width=595, height=842, background=None):
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            cachePageCatcherFigureNonA4.__init__(self, filename, pageNo, caption, width, height, background=background)
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    class PageCatcherFigureNonA4(FlexFigure):
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        """PageCatcher page with a caption below it.  Size to be supplied."""
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        # This should merge with PageFigure into one class that reuses
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        # form information to determine the page orientation...
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        def __init__(self, filename, pageNo, caption, width, height, background=None):
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            fn = self.filename = filename
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            self.pageNo = pageNo
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            fn = fn.replace(os.sep,'_').replace('/','_').replace('\\','_').replace('-','_').replace(':','_')
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            self.prefix = fn.replace('.','_')+'_'+str(pageNo)+'_'
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            self.formName = self.prefix + str(pageNo)
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            FlexFigure.__init__(self, width, height, caption, background)
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        def drawFigure(self):
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            self.canv.saveState()
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            if not self.canv.hasForm(self.formName):
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                f = open(self.filename,'rb')
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                pdf = f.read()
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                f.close()
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                f, data = storeFormsInMemory(pdf, pagenumbers=[self.pageNo], prefix=self.prefix)
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                f = restoreFormsInMemory(data, self.canv)
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            self.canv.scale(self._scaleFactor, self._scaleFactor)
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            self.canv.doForm(self.formName)
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            self.canv.restoreState()
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    class PageCatcherFigure(PageCatcherFigureNonA4):
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        """PageCatcher page with a caption below it.  Presumes A4, Portrait.
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        This needs our commercial PageCatcher product, or you'll get a blank."""
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        def __init__(self, filename, pageNo, caption, width=595, height=842, background=None):
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            PageCatcherFigureNonA4.__init__(self, filename, pageNo, caption, width, height, background=background)
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def demo1(canvas):
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    frame = Frame(
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                    2*inch,     # x
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                    4*inch,     # y at bottom
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                    4*inch,     # width
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                    5*inch,     # height
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                    showBoundary = 1  # helps us see what's going on
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                    )
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    bodyStyle = ParagraphStyle('Body', fontName='Times-Roman', fontSize=24, leading=28, spaceBefore=6)
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    para1 = Paragraph('Spam spam spam spam. ' * 5, bodyStyle)
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    para2 = Paragraph('Eggs eggs eggs. ' * 5, bodyStyle)
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    mydata = [para1, para2]
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    #this does the packing and drawing.  The frame will consume
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    #items from the front of the list as it prints them
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    frame.addFromList(mydata,canvas)
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def test1():
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    c  = Canvas('figures.pdf')
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    f = Frame(inch, inch, 6*inch, 9*inch, showBoundary=1)
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    v = PlatPropFigure1()
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    v.captionTextColor = toColor('blue')
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    v.captionBackColor = toColor('lightyellow')
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    f.addFromList([v],c)
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    c.save()
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if __name__ == '__main__':
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    test1()