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# -*- coding: utf-8 -*-
# vispy: gallery 1:35:2
# -----------------------------------------------------------------------------
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
# Author: Nicolas P .Rougier
# Date: 04/03/2014
# -----------------------------------------------------------------------------
"""
Rotating Quad
=============
Use a Timer to animate a quad
"""
from vispy import gloo, app
from vispy.gloo import Program
vertex = """
uniform float theta;
attribute vec4 color;
attribute vec2 position;
varying vec4 v_color;
void main()
{
float ct = cos(theta);
float st = sin(theta);
float x = 0.75* (position.x*ct - position.y*st);
float y = 0.75* (position.x*st + position.y*ct);
gl_Position = vec4(x, y, 0.0, 1.0);
v_color = color;
} """
fragment = """
varying vec4 v_color;
void main()
{
gl_FragColor = v_color;
} """
class Canvas(app.Canvas):
def __init__(self):
super().__init__(size=(512, 512), title='Rotating quad',
keys='interactive')
# Build program & data
self.program = Program(vertex, fragment, count=4)
self.program['color'] = [(1, 0, 0, 1), (0, 1, 0, 1),
(0, 0, 1, 1), (1, 1, 0, 1)]
self.program['position'] = [(-1, -1), (-1, +1),
(+1, -1), (+1, +1)]
self.program['theta'] = 0.0
gloo.set_viewport(0, 0, *self.physical_size)
gloo.set_clear_color('white')
self.timer = app.Timer('auto', self.on_timer)
self.clock = 0
self.timer.start()
self.show()
def on_draw(self, event):
gloo.clear()
self.program.draw('triangle_strip')
def on_resize(self, event):
gloo.set_viewport(0, 0, *event.physical_size)
def on_timer(self, event):
self.clock += 0.001 * 1000.0 / 60.
self.program['theta'] = self.clock
self.update()
if __name__ == '__main__':
c = Canvas()
app.run()
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