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viewport.py
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150 lines (107 loc) · 4.02 KB
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# -----------------------------------------------------------------------------
# Copyright (c) 2009-2016 Nicolas P. Rougier. All rights reserved.
# Distributed under the (new) BSD License.
# -----------------------------------------------------------------------------
from glumpy import library
from . transform import Transform
class Viewport(Transform):
"""
Viewport transform
:param bool transform:
Whether to enforce viewport transformation. Default is true.
:param nool clipping:
Whether to enforce viewport clipping. Default is true.
:param tuple viewport:
Viewport (x,y,w,h) in absolute window coordinates. Default is None.
The viewport transform allows to restrict the display of a scene to a local
viewport.
The transform is connected to the following events:
* ``on_attach``: Transform initialization
* ``on_resize``: Tranform update to maintain aspect
**Usage example**:
.. code:: python
vertex = '''
attribute vec2 position;
void main()
{
...
gl_Position = vec4(position,0,1);
<viewport.transform>;
} '''
fragment = '''
void main()
{
<viewport.clipping>;
...
gl_FragColor = vec4(1,0,0,1);
} '''
window = app.Window(400,400)
...
program = Program(vertex, fragment)
program["viewport"] = transforms.Viewport(viewport=(10,10,390,390))
window.attach(program["viewport"])
...
"""
aliases = { "clipping" : "viewport_clipping",
"transform" : "viewport_transform",
"local" : "viewport_local",
"extents" : "viewport_local",
"global" : "viewport_global" }
def __init__(self, code=None, *args, **kwargs):
if code is None:
code = library.get("transforms/viewport.glsl")
self._global = 0,0,512,512
self._local = Transform._get_kwarg("viewport", kwargs) or None
self._clipping = Transform._get_kwarg("clipping", kwargs) or True
self._transform = Transform._get_kwarg("transform", kwargs) or True
Transform.__init__(self, code, *args, **kwargs)
@property
def extents(self):
""" Viewport extents as (x,y,w,h) (absolute coordinates) """
return self._local
@extents.setter
def extents(self, value):
""" Viewport extents as (x,y,w,h) (absolute coordinates) """
self._local = value
if self.is_attached:
if self._local is None:
self["local"] = self._global
else:
self["local"] = self._local
self["clipping"] = self._clipping
self["transform"] = self._transform
@property
def clipping(self):
""" Whether to enforce viewport clipping """
return self._clipping
@clipping.setter
def clipping(self, value):
""" Whether to enforce viewport clipping """
self._clipping = value
if self.is_attached:
self["clipping"] = self._clipping
@property
def transform(self):
""" Whether to enforce viewport transform """
return self._transform
@transform.setter
def transform(self, value):
""" Whether to enforce viewport transform """
self._transform = value
if self.is_attached:
self["transform"] = self._transform
def on_attach(self, program):
self["global"] = self._global
if self._local is None:
self["local"] = self._global
else:
self["local"] = self._local
self["clipping"] = self._clipping
self["transform"] = self._transform
def on_resize(self, width, height):
self._global = 0, 0, width, height
self["global"] = self._global
if self._local is None:
self["local"] = self._global
# Transmit signal to other transforms
Transform.on_resize(self, width, height)