Hi list members!
I've been hacking away at this for quite some time and found no good examples
of what I am trying to do on Google, so I hope that someone can point me in the
right direction here (I am also very new to Python, so I will also accept ANY
tips on pythonic style, code, etc.)
What I want to do is display groups from an SVG file, and then individually and
dynamically change the colors for some groups but not others after certain
mouse events. My original idea was to read in the groups as QGraphicsSvgItems,
render them, and then change the brush colors and redraw them as needed. I'm
thinking now that maintaining a reference to the original file precludes any
later brush/pen changes unless I use a QSvgGenerator to write out an entirely
new SVG file with the color changes embedded! There don't seem to be any
functions related to brush color changes for QGraphicsSvgItems to help with
this. Another thought was trying to convert the SVG shapes to pixmaps and then
applying brush/pen changes, but I have been unable do that as well.
Here is some of my code to hopefully show the direction I have taken:
from xml.etree import ElementTree
from PyQt4 import QtGui
from PyQt4 import QtSvg
class SvgElement(QtSvg.QGraphicsSvgItem):
def __init__(self, name, renderer):
QtSvg.QGraphicsSvgItem.__init__(self)
self.setElementId(name)
self.setSharedRenderer(renderer)
self.setFlag(QtGui.QGraphicsItem.ItemIsMovable, True);
class SvgViewerPane(QtGui.QGraphicsScene):
def __init__(self, SVG_FILE, parent=None):
QtGui.QGraphicsScene.__init__(self, parent)
self.rend = QtSvg.QSvgRenderer(SVG_FILE)
""" Produce a list of group Elements from the SVG, each containing an id and
multiple 'path' attributes """
tree = ElementTree.parse(SVG_FILE)
makeGroupList(tree.getroot(), group_list)
for element in group_list:
n = SvgElement(element.get("id"), self.rend)
self.addItem(n)
OK, so that works fine to display all the groups and re-build the whole picture
in place (I do some additional coding to get the position of each group using a
'renderer.boundsOnElement' call). But now when I want to redraw a group with a
color I am at a loss! I tried to overwrite the paint function for SvgElement
thinking that if I could render the original image in alternate colors even
once it would be a start, but nothing is displayed at all. All attempts to
associate a QPainter with each Svg item have failed as well, but probably just
due to my lack of understanding ;-)
Any help is much appreciated!
John
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