如何使用svggraphicsItem在pyqt中渲染字形?
答案 0 :(得分:3)
最近我发现开罗生成的svg文件没有在pyqt中正确绘制。错误来自使用似乎没有在pyqt中显示的字形(这可能是错误的但我找不到任何方式来获取字形来渲染)。
我最终编写了一组将字形转换为svg路径的函数,以便文件正常呈现。
这些仍然可以使用一些改进来渲染颜色和其他样式元素(它们被锁定在我编写的函数中)。
这些函数需要嵌入到类中,或者自行删除以在别处使用。
我只是希望人们拥有这些,所以他们不必像我一样搜索高低,以找到在pyqt中渲染字形的方法。
希望最好的, 凯尔
def convertSVG(self, file):
dom = self._getsvgdom(file)
print dom
self._switchGlyphsForPaths(dom)
self._commitSVG(file, dom)
def _commitSVG(self, file, dom):
f = open(file, 'w')
dom.writexml(f)
f.close()
def _getsvgdom(self, file):
print 'getting DOM model'
import xml.dom
import xml.dom.minidom as mini
f = open(file, 'r')
svg = f.read()
f.close()
dom = mini.parseString(svg)
return dom
def _getGlyphPaths(self, dom):
symbols = dom.getElementsByTagName('symbol')
glyphPaths = {}
for s in symbols:
pathNode = [p for p in s.childNodes if 'tagName' in dir(p) and p.tagName == 'path']
glyphPaths[s.getAttribute('id')] = pathNode[0].getAttribute('d')
return glyphPaths
def _switchGlyphsForPaths(self, dom):
glyphs = self._getGlyphPaths(dom)
use = self._getUseTags(dom)
for glyph in glyphs.keys():
print glyph
nl = self.makeNewList(glyphs[glyph].split(' '))
u = self._matchUseGlyphs(use, glyph)
for u2 in u:
print u2, 'brefore'
self._convertUseToPath(u2, nl)
print u2, 'after'
def _getUseTags(self, dom):
return dom.getElementsByTagName('use')
def _matchUseGlyphs(self, use, glyph):
matches = []
for i in use:
print i.getAttribute('xlink:href')
if i.getAttribute('xlink:href') == '#'+glyph:
matches.append(i)
print matches
return matches
def _convertUseToPath(self, use, strokeD):
## strokeD is a list of lists of strokes to make the glyph
newD = self.nltostring(self.resetStrokeD(strokeD, use.getAttribute('x'), use.getAttribute('y')))
use.tagName = 'path'
use.removeAttribute('xlink:href')
use.removeAttribute('x')
use.removeAttribute('y')
use.setAttribute('style', 'fill: rgb(0%,0%,0%); stroke-width: 0.5; stroke-linecap: round; stroke-linejoin: round; stroke: rgb(0%,0%,0%); stroke-opacity: 1;stroke-miterlimit: 10; ')
use.setAttribute('d', newD)
def makeNewList(self, inList):
i = 0
nt = []
while i < len(inList):
start = i + self.listFind(inList[i:], ['M', 'L', 'C', 'Z'])
end = start + self.listFind(inList[start+1:], ['M', 'L', 'C', 'Z', '', ' '])
nt.append(inList[start:end+1])
i = end + 1
return nt
def listFind(self, x, query):
for i in range(len(x)):
if x[i] in query:
return i
return len(x)
def resetStrokeD(self, strokeD, x, y):
nsd = []
for i in strokeD:
nsd.append(self.resetXY(i, x, y))
return nsd
def resetXY(self, nl, x, y): # convert a list of strokes to xy coords
nl2 = []
for i in range(len(nl)):
if i == 0:
nl2.append(nl[i])
elif i%2: # it's odd
nl2.append(float(nl[i]) + float(x))
elif not i%2: # it's even
nl2.append(float(nl[i]) + float(y))
else:
print i, nl[i], 'error'
return nl2
def nltostring(self, nl): # convert a colection of nl's to a string
col = []
for l in nl:
templ = []
for c in l:
templ.append(str(c))
templ = ' '.join(templ)
col.append(templ)
return ' '.join(col)