SVG export looks good.
This commit is contained in:
Luke Campagnola
parent
b0e0781624
commit
49e2177623
@ -4,7 +4,7 @@ from pyqtgraph.Qt import QtGui, QtCore, QtSvg
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import pyqtgraph as pg
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import re
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import xml.dom.minidom as xml
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import numpy as np
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__all__ = ['SVGExporter']
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@ -121,13 +121,29 @@ def _generateItemSvg(item, nodes=None, root=None):
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## 1) Qt SVG does not implement clipping paths. This is absurd.
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## The solution is to let Qt generate SVG for each item independently,
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## then glue them together manually with clipping.
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##
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## The format Qt generates for all items looks like this:
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##
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## <g>
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## <g transform="matrix(...)">
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## one or more of: <path/> or <polyline/> or <text/>
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## </g>
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## <g transform="matrix(...)">
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## one or more of: <path/> or <polyline/> or <text/>
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## </g>
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## . . .
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## </g>
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##
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## 2) There seems to be wide disagreement over whether path strokes
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## should be scaled anisotropically.
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## see: http://web.mit.edu/jonas/www/anisotropy/
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## Given that both inkscape and illustrator seem to prefer isotropic
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## scaling, we will optimize for those cases.
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##
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## 3) Qt generates paths using non-scaling-stroke from SVG 1.2, but
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## inkscape only supports 1.1.
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##
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## Both 2 and 3 can be addressed by drawing all items in world coordinates.
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@ -155,14 +171,12 @@ def _generateItemSvg(item, nodes=None, root=None):
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doc = xml.parseString(xmlStr)
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else:
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childs = item.childItems()
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tr.translate(item.pos().x(), item.pos().y())
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tr = tr * item.transform()
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#if not item.isVisible() or int(item.flags() & item.ItemHasNoContents) > 0:
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#m = (tr.m11(), tr.m12(), tr.m21(), tr.m22(), tr.m31(), tr.m32())
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##print item, m
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#xmlStr = '<g><g transform="matrix(%f,%f,%f,%f,%f,%f)"></g></g>' % m # note: outer group is needed to separate clipping from transform
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#doc = xml.parseString(xmlStr)
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#else:
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if isinstance(root, QtGui.QGraphicsScene):
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tr = item.sceneTransform()
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else:
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tr = item.itemTransform(root)
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#tr.translate(item.pos().x(), item.pos().y())
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#tr = tr * item.transform()
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arr = QtCore.QByteArray()
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buf = QtCore.QBuffer(arr)
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svg = QtSvg.QSvgGenerator()
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@ -177,7 +191,7 @@ def _generateItemSvg(item, nodes=None, root=None):
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if hasattr(item, 'setExportMode'):
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item.setExportMode(True, {'painter': p})
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try:
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#p.setTransform(tr)
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p.setTransform(tr)
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item.paint(p, QtGui.QStyleOptionGraphicsItem(), None)
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finally:
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p.end()
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@ -197,17 +211,22 @@ def _generateItemSvg(item, nodes=None, root=None):
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except:
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print doc.toxml()
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raise
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## Get rid of group transformation matrices by applying
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## transformation to inner coordinates
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correctCoordinates(g1, item)
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## make sure g1 has the transformation matrix
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m = (tr.m11(), tr.m12(), tr.m21(), tr.m22(), tr.m31(), tr.m32())
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g1.setAttribute('transform', "matrix(%f,%f,%f,%f,%f,%f)" % m)
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#m = (tr.m11(), tr.m12(), tr.m21(), tr.m22(), tr.m31(), tr.m32())
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#g1.setAttribute('transform', "matrix(%f,%f,%f,%f,%f,%f)" % m)
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#print "=================",item,"====================="
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#print g1.toprettyxml(indent=" ", newl='')
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## Inkscape does not support non-scaling-stroke (this is SVG 1.2, inkscape supports 1.1)
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## So we need to correct anything attempting to use this.
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correctStroke(g1, item, root)
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#correctStroke(g1, item, root)
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## decide on a name for this item
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baseName = item.__class__.__name__
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@ -226,7 +245,10 @@ def _generateItemSvg(item, nodes=None, root=None):
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## See if this item clips its children
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if int(item.flags() & item.ItemClipsChildrenToShape) > 0:
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## Generate svg for just the path
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path = QtGui.QGraphicsPathItem(item.shape())
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if isinstance(root, QtGui.QGraphicsScene):
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path = QtGui.QGraphicsPathItem(item.mapToScene(item.shape()))
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else:
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path = QtGui.QGraphicsPathItem(item.mapToItem(root, item.shape()))
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pathNode = _generateItemSvg(path, root=root).getElementsByTagName('path')[0]
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## and for the clipPath element
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clip = name + '_clip'
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@ -248,7 +270,58 @@ def _generateItemSvg(item, nodes=None, root=None):
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return g1
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def correctCoordinates(node, item):
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## Remove transformation matrices from <g> tags by applying matrix to coordinates inside.
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groups = node.getElementsByTagName('g')
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for grp in groups:
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matrix = grp.getAttribute('transform')
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match = re.match(r'matrix\((.*)\)', matrix)
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if match is None:
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vals = [1,0,0,1,0,0]
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else:
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vals = map(float, match.groups()[0].split(','))
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tr = np.array([[vals[0], vals[2], vals[4]], [vals[1], vals[3], vals[5]]])
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removeTransform = False
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for ch in grp.childNodes:
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if not isinstance(ch, xml.Element):
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continue
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if ch.tagName == 'polyline':
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removeTransform = True
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coords = np.array([map(float, c.split(',')) for c in ch.getAttribute('points').strip().split(' ')])
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coords = pg.transformCoordinates(tr, coords, transpose=True)
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ch.setAttribute('points', ' '.join([','.join(map(str, c)) for c in coords]))
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elif ch.tagName == 'path':
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removeTransform = True
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newCoords = ''
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for c in ch.getAttribute('d').strip().split(' '):
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x,y = c.split(',')
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if x[0].isalpha():
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t = x[0]
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x = x[1:]
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else:
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t = ''
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nc = pg.transformCoordinates(tr, np.array([[float(x),float(y)]]), transpose=True)
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newCoords += t+str(nc[0,0])+','+str(nc[0,1])+' '
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ch.setAttribute('d', newCoords)
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elif ch.tagName == 'text':
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removeTransform = False
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#c = np.array([
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#[float(ch.getAttribute('x')), float(ch.getAttribute('y'))],
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#[float(ch.getAttribute('font-size')), 0],
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#[0,0]])
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#c = pg.transformCoordinates(tr, c, transpose=True)
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#ch.setAttribute('x', str(c[0,0]))
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#ch.setAttribute('y', str(c[0,1]))
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#fs = c[1]-c[2]
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#fs = (fs**2).sum()**0.5
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#ch.setAttribute('font-size', str(fs))
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else:
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print('warning: export not implemented for SVG tag %s (from item %s)' % (ch.tagName, item))
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if removeTransform:
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grp.removeAttribute('transform')
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def correctStroke(node, item, root, width=1):
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#print "==============", item, node
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@ -143,6 +143,7 @@ class LinearRegionItem(UIGraphicsItem):
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#prof = debug.Profiler('LinearRegionItem.paint')
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UIGraphicsItem.paint(self, p, *args)
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p.setBrush(self.currentBrush)
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p.setPen(fn.mkPen(None))
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p.drawRect(self.boundingRect())
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#prof.finish()
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