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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# vispy: gallery 1
"""
Demonstrating a cloud of points.
"""
import numpy as np
from vispy import gloo
from vispy import app
from vispy.util.transforms import perspective, translate, rotate
vert = """
#version 120
// Uniforms
// ------------------------------------
uniform mat4 u_model;
uniform mat4 u_view;
uniform mat4 u_projection;
uniform float u_linewidth;
uniform float u_antialias;
uniform float u_size;
// Attributes
// ------------------------------------
attribute vec3 a_position;
attribute vec4 a_fg_color;
attribute vec4 a_bg_color;
attribute float a_size;
// Varyings
// ------------------------------------
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;
gl_Position = u_projection * u_view * u_model * vec4(a_position,1.0);
gl_PointSize = v_size + 2.*(v_linewidth + 1.5*v_antialias);
}
"""
frag = """
#version 120
// Constants
// ------------------------------------
// Varyings
// ------------------------------------
varying vec4 v_fg_color;
varying vec4 v_bg_color;
varying float v_size;
varying float v_linewidth;
varying float v_antialias;
// Functions
// ------------------------------------
// ----------------
float disc(vec2 P, float size)
{
float r = length((P.xy - vec2(0.5,0.5))*size);
r -= v_size/2.;
return r;
}
// ----------------
float arrow_right(vec2 P, float size)
{
float r1 = abs(P.x -.50)*size + abs(P.y -.5)*size - v_size/2.;
float r2 = abs(P.x -.25)*size + abs(P.y -.5)*size - v_size/2.;
float r = max(r1,-r2);
return r;
}
// ----------------
float ring(vec2 P, float size)
{
float r1 = length((P.xy - vec2(0.5,0.5))*size) - v_size/2.;
float r2 = length((P.xy - vec2(0.5,0.5))*size) - v_size/4.;
float r = max(r1,-r2);
return r;
}
// ----------------
float clober(vec2 P, float size)
{
const float PI = 3.14159265358979323846264;
const float t1 = -PI/2.;
const vec2 c1 = 0.2*vec2(cos(t1),sin(t1));
const float t2 = t1+2.*PI/3.;
const vec2 c2 = 0.2*vec2(cos(t2),sin(t2));
const float t3 = t2+2.*PI/3.;
const vec2 c3 = 0.2*vec2(cos(t3),sin(t3));
float r1 = length((P.xy- vec2(0.5,0.5) - c1)*size);
r1 -= v_size/3;
float r2 = length((P.xy- vec2(0.5,0.5) - c2)*size);
r2 -= v_size/3;
float r3 = length((P.xy- vec2(0.5,0.5) - c3)*size);
r3 -= v_size/3;
float r = min(min(r1,r2),r3);
return r;
}
// ----------------
float square(vec2 P, float size)
{
float r = max(abs(P.x -.5)*size,
abs(P.y -.5)*size);
r -= v_size/2.;
return r;
}
// ----------------
float diamond(vec2 P, float size)
{
float r = abs(P.x -.5)*size + abs(P.y -.5)*size;
r -= v_size/2.;
return r;
}
// ----------------
float vbar(vec2 P, float size)
{
float r1 = max(abs(P.x -.75)*size,
abs(P.x -.25)*size);
float r3 = max(abs(P.x -.5)*size,
abs(P.y -.5)*size);
float r = max(r1,r3);
r -= v_size/2.;
return r;
}
// ----------------
float hbar(vec2 P, float size)
{
float r2 = max(abs(P.y -.75)*size,
abs(P.y -.25)*size);
float r3 = max(abs(P.x -.5)*size,
abs(P.y -.5)*size);
float r = max(r2,r3);
r -= v_size/2.;
return r;
}
// ----------------
float cross(vec2 P, float size)
{
float r1 = max(abs(P.x -.75)*size,
abs(P.x -.25)*size);
float r2 = max(abs(P.y -.75)*size,
abs(P.y -.25)*size);
float r3 = max(abs(P.x -.5)*size,
abs(P.y -.5)*size);
float r = max(min(r1,r2),r3);
r -= v_size/2.;
return r;
}
// Main
// ------------------------------------
void main()
{
float size = v_size +2.0*(v_linewidth + 1.5*v_antialias);
float t = v_linewidth/2.0-v_antialias;
float r = disc(gl_PointCoord, size);
// float r = square(gl_PointCoord, size);
// float r = ring(gl_PointCoord, size);
// float r = arrow_right(gl_PointCoord, size);
// float r = diamond(gl_PointCoord, size);
// float r = cross(gl_PointCoord, size);
// float r = clober(gl_PointCoord, size);
// float r = hbar(gl_PointCoord, size);
// float r = vbar(gl_PointCoord, size);
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, 600))
ps = self.pixel_scale
# Create vertices
n = 1000000
data = np.zeros(n, [('a_position', np.float32, 3),
('a_bg_color', np.float32, 4),
('a_fg_color', np.float32, 4),
('a_size', np.float32)])
data['a_position'] = 0.45 * np.random.randn(n, 3)
data['a_bg_color'] = np.random.uniform(0.85, 1.00, (n, 4))
data['a_fg_color'] = 0, 0, 0, 1
data['a_size'] = np.random.uniform(5*ps, 10*ps, n)
u_linewidth = 1.0
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.apply_zoom()
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.theta = 0
self.phi = 0
gloo.set_state('translucent', clear_color='white')
self.timer = app.Timer('auto', connect=self.on_timer, start=True)
self.show()
def on_key_press(self, event):
if event.text == ' ':
if self.timer.running:
self.timer.stop()
else:
self.timer.start()
def on_timer(self, event):
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.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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