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test3.py
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from vispy import gloo
from vispy import app
import numpy as np
from math import exp
n = 1000
v_position = 0.25 * np.random.randn(n, 2).astype(np.float32)
v_color = np.random.uniform(0, 1, (n, 3)).astype(np.float32)
v_size = np.random.uniform(2, 12, (n, 1)).astype(np.float32)
VERT_SHADER = """
attribute vec2 a_position;
attribute vec3 a_color;
attribute float a_size;
uniform vec2 u_pan;
uniform vec2 u_scale;
varying vec4 v_fg_color;
varying vec4 v_bg_color;
varying float v_radius;
varying float v_linewidth;
varying float v_antialias;
void main (void) {
v_radius = a_size;
v_linewidth = 2.0;
v_antialias = 1.0;
v_fg_color = vec4(0.0,0.0,0.0,0.5);
v_bg_color = vec4(a_color, 1.0);
vec2 position_tr = u_scale * (a_position + u_pan);
gl_Position = vec4(position_tr, 0.0, 1.0);
gl_PointSize = 2.0*(v_radius + v_linewidth + 1.5*v_antialias);
}
"""
FRAG_SHADER = """
varying vec4 v_fg_color;
varying vec4 v_bg_color;
varying float v_radius;
varying float v_linewidth;
varying float v_antialias;
void main()
{
float size = 2.0*(v_radius + 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);
float d = abs(r - v_radius) - t;
if( d < 0.0 )
gl_FragColor = v_fg_color;
else
{
float alpha = d/v_antialias;
alpha = exp(-alpha*alpha);
if (r > v_radius)
gl_FragColor = vec4(v_fg_color.rgb, alpha*v_fg_color.a);
else
gl_FragColor = mix(v_bg_color, v_fg_color, alpha);
}
}
"""
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, close_keys='escape')
self.program = gloo.Program(VERT_SHADER, FRAG_SHADER)
self.program['a_color'] = gloo.VertexBuffer(v_color)
self.program['a_position'] = gloo.VertexBuffer(v_position)
self.program['a_size'] = gloo.VertexBuffer(v_size)
self.program['u_pan'] = (0., 0.)
self.program['u_scale'] = (1., 1.)
def on_initialize(self, event):
gloo.set_state(clear_color=(1, 1, 1, 1), blend=True,
blend_func=('src_alpha', 'one_minus_src_alpha'))
def on_mouse_move(self, event):
def _normalize((x, y)):
w, h = float(self.width), float(self.height)
return x/(w/2.)-1., y/(h/2.)-1.
if event.is_dragging:
x0, y0 = _normalize(event.press_event.pos)
x1, y1 = _normalize(event.last_event.pos)
x, y = _normalize(event.pos)
dx, dy = x - x1, -(y - y1)
button = event.press_event.button
pan_x, pan_y = self.program['u_pan']
scale_x, scale_y = self.program['u_scale']
if button == 1:
self.program['u_pan'] = (pan_x+dx/scale_x, pan_y+dy/scale_y)
elif button == 2:
scale_x_new, scale_y_new = scale_x * exp(2.5*dx), scale_y * exp(2.5*dy)
self.program['u_scale'] = (scale_x_new, scale_y_new)
self.program['u_pan'] = (pan_x - x0 * (1./scale_x - 1./scale_x_new),
pan_y + y0 * (1./scale_y - 1./scale_y_new))
self.update()
def on_resize(self, event):
self.width, self.height = event.size
gloo.set_viewport(0, 0, self.width, self.height)
def on_draw(self, event):
gloo.clear()
self.program.draw('points')
if __name__ == '__main__':
c = Canvas()
c.show()
app.run()
from vispy_export import export_canvas_json
export_canvas_json(c, 'test3.json')