On 8/22/08, Alex Holkner <[EMAIL PROTECTED]> wrote:
> On 8/22/08, Martin Glueck <[EMAIL PROTECTED]> wrote:
> > Hi,
> >
> > I idea is to implement a scrolling text using the IncrementalTextLayout.
> >
> > In some cases, I need this scrolled text 90 degrees rotated.
> >
> > Therefore I have apply a rotate and a transformation before I call the draw
> > method of the text layout.
> >
> > The problem seems to be that one a rotation is in effect the result is not
> > is I would have expected it.
> > Especially the meaning of the width and heiht properties of the
> > IncrementalTextLayout is really strange.
>
>
> This is due to IncrementalTextLayout (actually ScrollableTextLayout,
> its superclass) using a glScissor to clip the text to the dimensions
> given by width/height. The scissor is not transformed by the
> modelview matrix, which is why you're getting incorrect clipping.
>
> I'm afraid I don't have an easy solution for you; a general solution
> would require the scissor to be replaced with clipping planes. You
> could override ScrollableTextLayoutGroup.set_state and make this
> change yourself if you need to.
Here's a patch that does this, it should fix your problem. I'm not
sure whether or not to add this into pyglet 1.1-maintenance.
Index: pyglet/text/layout.py
===================================================================
--- pyglet/text/layout.py (revision 2200)
+++ pyglet/text/layout.py (working copy)
@@ -543,15 +543,26 @@
translate_y = 0 # y - view_y
def set_state(self):
- glPushAttrib(GL_ENABLE_BIT | GL_SCISSOR_BIT | GL_CURRENT_BIT)
+ glPushAttrib(GL_ENABLE_BIT | GL_TRANSFORM_BIT | GL_CURRENT_BIT)
glEnable(GL_BLEND)
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
- # Disable scissor to check culling.
- glEnable(GL_SCISSOR_TEST)
- glScissor(self._scissor_x - 1,
- self._scissor_y - self._scissor_height,
- self._scissor_width + 1,
- self._scissor_height)
+ # Disable clipping planes to check culling.
+ glEnable(GL_CLIP_PLANE0)
+ glEnable(GL_CLIP_PLANE1)
+ glEnable(GL_CLIP_PLANE2)
+ glEnable(GL_CLIP_PLANE3)
+ # Left
+ glClipPlane(GL_CLIP_PLANE0, (GLdouble * 4)(
+ 1, 0, 0, -(self._scissor_x - 1)))
+ # Top
+ glClipPlane(GL_CLIP_PLANE1, (GLdouble * 4)(
+ 0, 1, 0, -(self._scissor_y - self._scissor_height)))
+ # Right
+ glClipPlane(GL_CLIP_PLANE2, (GLdouble * 4)(
+ -1, 0, 0, self._scissor_x + self._scissor_width + 1))
+ # Bottom
+ glClipPlane(GL_CLIP_PLANE3, (GLdouble * 4)(
+ 0, -1, 0, self._scissor_y + self._scissor_height))
glTranslatef(self.translate_x, self.translate_y, 0)
def unset_state(self):
--~--~---------~--~----~------------~-------~--~----~
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