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# -*- coding: utf-8 -*-
# vispy: gallery 30
# -----------------------------------------------------------------------------
# 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
# -----------------------------------------------------------------------------
"""
Mesmerizing donut
"""
import numpy as np
from vispy import gloo
from vispy import app
from vispy.util.transforms import perspective, translate, rotate
vert = """
#version 120
uniform mat4 u_model;
uniform mat4 u_view;
uniform mat4 u_projection;
uniform float u_linewidth;
uniform float u_antialias;
uniform float u_size;
uniform float u_clock;
attribute vec2 a_position;
attribute vec4 a_fg_color;
attribute vec4 a_bg_color;
attribute float a_size;
varying vec4 v_fg_color;
varying vec4 v_bg_color;
varying float v_size;
varying float v_linewidth;
varying float v_antialias;
void main (void) {
v_size = a_size * u_size;
v_linewidth = u_linewidth;
v_antialias = u_antialias;
v_fg_color = a_fg_color;
v_bg_color = a_bg_color;
float x0 = 0.5;
float z0 = 0.0;
float theta = a_position.x + u_clock;
float x1 = x0*cos(theta) + z0*sin(theta) - 1.0;
float y1 = 0.0;
float z1 = z0*cos(theta) - x0*sin(theta);
float phi = a_position.y;
float x2 = x1*cos(phi) + y1*sin(phi);
float y2 = y1*cos(phi) - x1*sin(phi);
float z2 = z1;
gl_Position = u_projection * u_view * u_model * vec4(x2,y2,z2,1.);
gl_PointSize = v_size + 2.*(v_linewidth + 1.5*v_antialias);
}
"""
frag = """
#version 120
varying vec4 v_fg_color;
varying vec4 v_bg_color;
varying float v_size;
varying float v_linewidth;
varying float v_antialias;
void main()
{
float size = v_size +2*(v_linewidth + 1.5*v_antialias);
float t = v_linewidth/2.0-v_antialias;
float r = length((gl_PointCoord.xy - vec2(0.5,0.5))*size) - v_size/2.;
float d = abs(r) - t;
if( r > (v_linewidth/2.0+v_antialias))
{
discard;
}
else if( d < 0.0 )
{
gl_FragColor = v_fg_color;
}
else
{
float alpha = d/v_antialias;
alpha = exp(-alpha*alpha);
if (r > 0)
gl_FragColor = vec4(v_fg_color.rgb, alpha*v_fg_color.a);
else
gl_FragColor = mix(v_bg_color, v_fg_color, alpha);
}
}
"""
# ------------------------------------------------------------ Canvas class ---
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, keys='interactive', size=(800, 800))
ps = self.pixel_scale
self.title = "D'oh! A big donut"
# Create vertices
n, p = 50, 40
data = np.zeros(p * n, [('a_position', np.float32, 2),
('a_bg_color', np.float32, 4),
('a_fg_color', np.float32, 4),
('a_size', np.float32)])
data['a_position'][:, 0] = np.resize(np.linspace(
0, 2 * np.pi, n), p * n)
data['a_position'][:, 1] = np.repeat(np.linspace(0, 2 * np.pi, p), n)
data['a_bg_color'] = np.random.uniform(0.75, 1.00, (n * p, 4))
data['a_bg_color'][:, 3] = 1
data['a_fg_color'] = 0, 0, 0, 1
# data['a_size'] = np.random.uniform(8*ps, 8*ps, n * p)
data['a_size'] = 8.0*ps
u_linewidth = 1.0*ps
u_antialias = 1.0
self.translate = 5
self.program = gloo.Program(vert, frag)
self.view = translate((0, 0, -self.translate))
self.model = np.eye(4, dtype=np.float32)
self.projection = np.eye(4, dtype=np.float32)
self.program.bind(gloo.VertexBuffer(data))
self.program['u_linewidth'] = u_linewidth
self.program['u_antialias'] = u_antialias
self.program['u_model'] = self.model
self.program['u_view'] = self.view
self.program['u_size'] = 5 / self.translate
self.apply_zoom()
self.theta = 0
self.phi = 0
self.clock = 0
self.stop_rotation = False
gloo.set_state('translucent', clear_color='white')
self.program['u_clock'] = 0.0
self._timer = app.Timer('auto', connect=self.on_timer, start=True)
self.show()
def on_key_press(self, event):
if event.text == ' ':
self.stop_rotation = not self.stop_rotation
def on_timer(self, event):
if not self.stop_rotation:
self.theta += .5
self.phi += .5
self.model = np.dot(rotate(self.theta, (0, 0, 1)),
rotate(self.phi, (0, 1, 0)))
self.program['u_model'] = self.model
self.clock += np.pi / 1000
self.program['u_clock'] = self.clock
self.update()
def on_resize(self, event):
self.apply_zoom()
def on_mouse_wheel(self, event):
self.translate -= event.delta[1]
self.translate = max(2, self.translate)
self.view = translate((0, 0, -self.translate))
self.program['u_view'] = self.view
self.program['u_size'] = 5 / self.translate
self.update()
def on_draw(self, event):
gloo.clear()
self.program.draw('points')
def apply_zoom(self):
gloo.set_viewport(0, 0, self.physical_size[0], self.physical_size[1])
self.projection = perspective(45.0, self.size[0] /
float(self.size[1]), 1.0, 1000.0)
self.program['u_projection'] = self.projection
if __name__ == '__main__':
c = Canvas()
app.run()
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