canvas.skew(alpha, beta)
All PDF drawings fit into a specified page size. Elements drawn outside of the specified page size are not vis-
ible. Furthermore all drawn elements are passed through an affine transformation which may adjust their loca-
tion and/or distort their appearence. The setPageSize method adjusts the current page size. The
transform, translate, scale, rotate, and skew methods add additional transformations to the cur-
rent transformation. It is important to remember that these transformations are incremental -- a new transform
modifies the current transform (but does not replace it).
State control
canvas.saveState()
canvas.restoreState()
Very often it is important to save the current font, graphics transform, line styles and other graphics state in
order to restore them later. The saveState method marks the current graphics state for later restoration by
a matching restoreState. Note that the save and restore method invokation must match -- a restore call
restores the state to the most recently saved state which hasn't been restored yet. You cannot save the state on
one page and restore it on the next, however -- no state is preserved between pages.
2.6 Other canvas methods.
Not all methods of the canvas object fit into the "tool" or "toolbox" categories. Below are some of the mis-
fits, included here for completeness.
canvas.setAuthor()
canvas.addOutlineEntry(title, key, level=0, closed=None)
canvas.setTitle(title)
canvas.setSubject(subj)
canvas.pageHasData()
canvas.showOutline()
canvas.bookmarkPage(name)
canvas.bookmarkHorizontalAbsolute(name, yhorizontal)
canvas.doForm()
canvas.beginForm(name, lowerx=0, lowery=0, upperx=None, uppery=None)
canvas.endForm()
canvas.linkAbsolute(contents, destinationname, Rect=None, addtopage=1, name=None, **kw)
canvas.linkRect(contents, destinationname, Rect=None, addtopage=1, relative=1, name=None, **kw)
canvas.getPageNumber()
canvas.addLiteral()
canvas.getAvailableFonts()
canvas.stringWidth(self, text, fontName, fontSize, encoding=None)
canvas.setPageCompression(onoff=1)
canvas.setPageTransition(self, effectname=None, duration=1,
direction=0,dimension='H',motion='I')
2.7 Coordinates (default user space)
By default locations on a page are identified by a pair of numbers. For example the pair (4.5*inch,
1*inch) identifies the location found on the page by starting at the lower left corner and moving to the right
4.5 inches and up one inch.
For example, the following function draws a number of elements on a canvas.
def coords(canvas):
from reportlab.lib.units import inch
from reportlab.lib.colors import pink, black, red, blue, green
c = canvas
c.setStrokeColor(pink)
c.grid([inch, 2*inch, 3*inch, 4*inch], [0.5*inch, inch, 1.5*inch, 2*inch, 2.5*inch])
c.setStrokeColor(black)
c.setFont("Times-Roman", 20)
c.drawString(0,0, "(0,0) the Origin")
c.drawString(2.5*inch, inch, "(2.5,1) in inches")
c.drawString(4*inch, 2.5*inch, "(4, 2.5)")
c.setFillColor(red)
User Guide Chapter 2 Graphics and Text with pdfgen
Page 16
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