fancytext.py

Wxpython Implemented on Windows CE, Source code

        setattr(Renderer, "end_%s" % name, end)
        if name == "altsigma":
            continue # There is no capital for altsigma
        def start(self, attrs, code=chr(Alpha+i)):
            self.start_font({"encoding" : _greekEncoding})
            self.characterData(code)
            self.end_font()
        setattr(Renderer, "start_%s" % name.capitalize(), start)
        setattr(Renderer, "end_%s" % name.capitalize(), end)
_addGreek()    



class SizeRenderer(Renderer):
    """Processes text as if rendering it, but just computes the size."""
    
    def __init__(self, dc=None):
        Renderer.__init__(self, dc, 0, 0)
    
    def renderCharacterData(self, data, x, y):
        pass
        
    def start_angle(self, attrs):
        self.characterData("M")

    def start_infinity(self, attrs):
        width, height = self.dc.GetTextExtent("M")
        width = max(width, 10)
        height = max(height, width / 2)
        self.updateDims(width, height, 0, 0)

    def start_times(self, attrs):
        self.characterData("M")

    def start_in(self, attrs):
        self.characterData("M")

    def start_times(self, attrs):
        self.characterData("M")        

    
class DCRenderer(Renderer):
    """Renders text to a wxPython device context DC."""

    def renderCharacterData(self, data, x, y):
        self.dc.SetTextForeground(self.getCurrentColor())
        self.dc.DrawText(data, x, y)

    def start_angle(self, attrs):
        self.dc.SetFont(self.getCurrentFont())
        self.dc.SetPen(self.getCurrentPen())
        width, height, descent, leading = self.dc.GetFullTextExtent("M")
        y = self.y + self.offsets[-1]
        self.dc.DrawLine(iround(self.x), iround(y), iround( self.x+width), iround(y))
        self.dc.DrawLine(iround(self.x), iround(y), iround(self.x+width), iround(y-width))
        self.updateDims(width, height, descent, leading)
      

    def start_infinity(self, attrs):
        self.dc.SetFont(self.getCurrentFont())
        self.dc.SetPen(self.getCurrentPen())
        width, height, descent, leading = self.dc.GetFullTextExtent("M")
        width = max(width, 10)
        height = max(height, width / 2)
        self.dc.SetPen(wx.Pen(self.getCurrentColor(), max(1, width/10)))
        self.dc.SetBrush(wx.TRANSPARENT_BRUSH)
        y = self.y + self.offsets[-1]
        r = iround( 0.95 * width / 4)
        xc = (2*self.x + width) / 2
        yc = iround(y-1.5*r)
        self.dc.DrawCircle(xc - r, yc, r)
        self.dc.DrawCircle(xc + r, yc, r)
        self.updateDims(width, height, 0, 0)

    def start_times(self, attrs):
        self.dc.SetFont(self.getCurrentFont())
        self.dc.SetPen(self.getCurrentPen())
        width, height, descent, leading = self.dc.GetFullTextExtent("M")
        y = self.y + self.offsets[-1]
        width *= 0.8
        width = iround(width+.5)
        self.dc.SetPen(wx.Pen(self.getCurrentColor(), 1))
        self.dc.DrawLine(iround(self.x), iround(y-width), iround(self.x+width-1), iround(y-1))
        self.dc.DrawLine(iround(self.x), iround(y-2), iround(self.x+width-1), iround(y-width-1))
        self.updateDims(width, height, 0, 0)


def RenderToRenderer(str, renderer, enclose=True):
    try:
        if enclose:
            str = '<?xml version="1.0"?><FancyText>%s</FancyText>' % str
        p = xml.parsers.expat.ParserCreate()
        p.returns_unicode = 0
        p.StartElementHandler = renderer.startElement
        p.EndElementHandler = renderer.endElement
        p.CharacterDataHandler = renderer.characterData
        p.Parse(str, 1)
    except xml.parsers.expat.error, err:
        raise ValueError('error parsing text text "%s": %s' % (str, err)) 


# Public interface


def GetExtent(str, dc=None, enclose=True):
    "Return the extent of str"
    renderer = SizeRenderer(dc)
    RenderToRenderer(str, renderer, enclose)
    return iceil(renderer.width), iceil(renderer.height) # XXX round up


def GetFullExtent(str, dc=None, enclose=True):
    renderer = SizeRenderer(dc)
    RenderToRenderer(str, renderer, enclose)
    return iceil(renderer.width), iceil(renderer.height), -iceil(renderer.minY) # XXX round up


def RenderToBitmap(str, background=None, enclose=1):
    "Return str rendered on a minumum size bitmap"
    dc = wx.MemoryDC()
    # Chicken and egg problem, we need a bitmap in the DC in order to
    # measure how big the bitmap should be...
    dc.SelectObject(wx.EmptyBitmap(1,1))
    width, height, dy = GetFullExtent(str, dc, enclose)
    bmp = wx.EmptyBitmap(width, height)
    dc.SelectObject(bmp)
    if background is None:
        dc.SetBackground(wx.WHITE_BRUSH)
    else:
        dc.SetBackground(background) 
    dc.Clear()
    renderer = DCRenderer(dc, y=dy)
    dc.BeginDrawing()
    RenderToRenderer(str, renderer, enclose)
    dc.EndDrawing()
    dc.SelectObject(wx.NullBitmap)
    if background is None:
        img = wx.ImageFromBitmap(bmp)
        bg = dc.GetBackground().GetColour()
        img.SetMaskColour(bg.Red(), bg.Green(), bg.Blue())
        bmp = img.ConvertToBitmap()
    return bmp


def RenderToDC(str, dc, x, y, enclose=1):
    "Render str onto a wxDC at (x,y)"
    width, height, dy = GetFullExtent(str, dc)
    renderer = DCRenderer(dc, x, y+dy)
    RenderToRenderer(str, renderer, enclose)
    
    
class StaticFancyText(wx.StaticBitmap):
    def __init__(self, window, id, text, *args, **kargs):
        args = list(args)
        kargs.setdefault('name', 'staticFancyText')
        if 'background' in kargs:
            background = kargs.pop('background')
        elif args:
            background = args.pop(0)
        else:
            background = wx.Brush(window.GetBackgroundColour(), wx.SOLID)
        
        bmp = RenderToBitmap(text, background)
        wx.StaticBitmap.__init__(self, window, id, bmp, *args, **kargs)


# Old names for backward compatibiliry
getExtent = GetExtent
renderToBitmap = RenderToBitmap
renderToDC = RenderToDC


# Test Driver

def test():
    testText = \
"""<font weight="bold" size="16">FancyText</font> -- <font style="italic" size="16">methods for rendering XML specified text</font>
<font family="swiss" size="12">
This module exports four main methods::
<font family="fixed" style="slant">
    def GetExtent(str, dc=None, enclose=True)
    def GetFullExtent(str, dc=None, enclose=True)
    def RenderToBitmap(str, background=None, enclose=True)
    def RenderToDC(str, dc, x, y, enclose=True)
</font>
In all cases, 'str' is an XML string. Note that start and end tags
are only required if *enclose* is set to False. In this case the 
text should be wrapped in FancyText tags.

In addition, the module exports one class::
<font family="fixed" style="slant">
    class StaticFancyText(self, window, id, text, background, ...)
</font>
This class works similar to StaticText except it interprets its text 
as FancyText.

The text can support<sup>superscripts</sup> and <sub>subscripts</sub>, text
in different <font size="20">sizes</font>, <font color="blue">colors</font>, <font style="italic">styles</font>, <font weight="bold">weights</font> and
<font family="script">families</font>. It also supports a limited set of symbols,
currently <times/>, <infinity/>, <angle/> as well as greek letters in both
upper case (<Alpha/><Beta/>...<Omega/>) and lower case (<alpha/><beta/>...<omega/>).

We can use doctest/guitest to display this string in all its marked up glory.
<font family="fixed">
>>> frame = wx.Frame(wx.NULL, -1, "FancyText demo", wx.DefaultPosition)
>>> sft = StaticFancyText(frame, -1, __doc__, wx.Brush("light grey", wx.SOLID))
>>> frame.SetClientSize(sft.GetSize())
>>> didit = frame.Show()
>>> from guitest import PauseTests; PauseTests()

</font></font>
The End"""

    app = wx.PySimpleApp()
    box = wx.BoxSizer(wx.VERTICAL)
    frame = wx.Frame(None, -1, "FancyText demo", wx.DefaultPosition)
    frame.SetBackgroundColour("light grey")
    sft = StaticFancyText(frame, -1, testText)
    box.Add(sft, 1, wx.EXPAND)
    frame.SetSizer(box)
    frame.SetAutoLayout(True)
    box.Fit(frame)
    box.SetSizeHints(frame)
    frame.Show()
    app.MainLoop()

if __name__ == "__main__":    
    test()