Pyqt中的SVG字形 [英] SVG Glyphs in Pyqt

问题描述

如何使用svggraphicsItem在pyqt中渲染字形?

How do I render glyphs in pyqt using the svggraphicsItem?

推荐答案

最近，我发现Cairo生成的svg文件在pyqt中无法正确绘制.错误来自字形的使用，而字形似乎未在pyqt中显示(这可能是错误的，但我找不到任何方法来渲染字形).

Recently I found that svg files generated by Cairo do not plot properly in pyqt. The error comes from the use of glyphs which seem not to be shown in pyqt (this might be wrong but I couldn't find any way of getting glyphs to render).

我最终编写了一组函数，这些函数会将字形转换为svg路径，以便文件可以正常呈现.

I ended up writing a set of functions that will convert the glyphs to svg paths so the file will render normally.

这些仍可以使用一些改进来渲染颜色和其他样式元素(这些元素已锁定在我编写的函数中).

These could still use some improvements for rendering color and other style elements (which are locked in the functions that I wrote).

这些功能将需要嵌入到类中或自行删除才能在其他地方使用.

These functions will need to be embedded in a class or have self removed to be used elsewhere.

我只是希望人们拥有这些，这样他们就不必像我找到在pyqt中渲染字形的方法那样进行上下搜索.

I just wanted people to have these so they wouldn't have to search high and low like I did to find a way to render glyphs in pyqt.

希望最好，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)

这篇关于Pyqt中的SVG字形的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！