def _draw(self):
# Update ticks prior to drawing if required
if self._ticks_need_updating:
self._update_xticks()
self._update_yticks()
self._ticks_need_updating = False
# Prepare for plotting
gl.glMatrixMode(gl.GL_MODELVIEW)
gl.glPushMatrix()
gl.glLoadMatrixd(self._gl_mview_xylims)
# Clip everything in the pane
gl.glScissor(*self._gl_scissor_xylims)
gl.glEnable(gl.GL_SCISSOR_TEST)
# Clear region defined by scissor-clipping
gl.glClearColor(*self._bgcolour)
gl.glClear(gl.GL_COLOR_BUFFER_BIT)
for line in self.lines:
line.draw()
# Unclip to draw borders (all settings should be restored)
gl.glDisable(gl.GL_SCISSOR_TEST)
# Draw border in figure space (line never needs updating)
gl.glLoadMatrixd(self._figure._gl_mview_xylims)
self._edge_line.draw()
# Draw tick text in pixel space
gl.glPopMatrix()
for t in self._gl_xticks.values() + self._gl_yticks.values():
t['glt'].draw()
def _initgl(self):
"""Initialise OpenGL settings (called once before first draw)"""
# All drawing is 2d
gl.glDisable(gl.GL_DEPTH_TEST)
gl.glDisable(gl.GL_LIGHTING)
# Shading is not needed
gl.glShadeModel(gl.GL_FLAT)
# Anti-aliasing settings
gl.glHint(gl.GL_LINE_SMOOTH_HINT, gl.GL_NICEST)
gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA)
gl.glEnable(gl.GL_LINE_SMOOTH)
gl.glEnable(gl.GL_BLEND)