|GooCanvas Reference Manual|
WYSIWYG Printing — how to use the canvas to create accurate printed output.
The GooCanvas "resolution-x" and "resolution-y"
properties must be set correctly. They both default to 96dpi, which
corresponds to a typical monitor. To get a more accurate figure you
might be able to use
gdk_screen_get_resolution(), but this isn't always
guaranteed to be correct. If accuracy is very important a method should
be provided for the user to calibrate the screen.
The GooCanvas "units" property must be set to one of
GTK_UNIT_INCH (it defaults to
All values used within the canvas are assumed to be in the specified
units, including font sizes.
Absolute font sizes must be used (to prevent the fonts being mistakenly scaled by Pango as well as by GooCanvas). To specify absolute font sizes add "px" after the font size, e.g. instead of "Sans 9" use "Sans 9px".
Font sizes must be converted to the units used by the canvas.
For example, if a 9 point "Sans" font is desired but "units"
is set to
GTK_UNIT_MM, then the size must first be converted into
millimeters: (9 / 72) * 25.4 = 3.175mm.
So the font used would be "Sans 3.175px".