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#!/usr/bin/env python
'''
'''
__docformat__ = 'restructuredtext'
__version__ = '$Id: __init__.py,v 1.14 2006/05/25 14:14:40 alex Exp $'
from OpenGL.GL import *
import pyglyph.font
import pyglyph.html
import pyglyph.layout
Align = pyglyph.layout.Align
def begin():
"""Push a text-rendering mode onto the OpenGL stack.
This sets up the rendering context so it's ready for text rendering.
Specifically, it enables texturing, alpha-blending and texture
modulation. The changes are pushed onto the attribute stack and
the previous state can be recalled by calling `end`.
Typical usage is::
begin()
draw_text('Hello')
end()
Since state changes in OpenGL are relatively expensive, you should
group all text drawing calls into a single begin/end block each
frame. If your drawing context has texturing and alpha blending
enabled and setup in the usual way anyway, there is no need to
call this function.
"""
glPushAttrib(GL_ENABLE_BIT | GL_TEXTURE_BIT)
glEnable(GL_TEXTURE_2D)
glEnable(GL_BLEND)
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE)
def end():
"""Pop the text-rendering mode off the OpenGL stack.
See `begin` for details.
"""
glPopAttrib()
_default_font_factory = None
def layout_html(text, width=-1, font_factory=None):
"""Layout HTML markup ready for drawing in OpenGL.
:Parameters:
`text` : str
HTML markup text to render
`width` : int
Width, in pixels, at which to wrap lines. Defaults to not
wrapping.
`font_factory` : pyglyph.font.BaseFontFactory
Font factory to use for instantiating fonts. If unspecified,
search the current directory for Truetype files.
"""
if not font_factory:
global _default_font_factory
if not _default_font_factory:
_default_font_factory = pyglyph.font.LocalFontFactory('.')
font_factory = _default_font_factory
runs = pyglyph.html.parse(text, font_factory)
layout = pyglyph.layout.OpenGLTextLayout(width)
layout.layout(runs)
return layout
_default_font = None
def layout_text(text, width=-1, font=None, color=(0,0,0,1)):
"""Layout plain text ready for drawing in OpenGL.
:Parameters:
`text` : str
Text string to render
`width` : int
Width, in pixels, at which to wrap lines. Defaults to not
wrapping.
`font` : pyglyph.font.FontInstance
FontInstance to render the text with. If unspecified,
the pygame default font is used at size 16pt.
`color` : tuple of size 3 or 4
Color to render the text in (passed to glColor).
"""
if not font:
global _default_font
if not _default_font:
_default_font = pyglyph.font.FontInstance(None, 16)
font = _default_font
style = pyglyph.layout.Style(font, color)
run = pyglyph.layout.StyledRun(text, style)
layout = pyglyph.layout.OpenGLTextLayout(width)
layout.layout([run])
return layout
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