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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.
# -----------------------------------------------------------------------------
""" Display markers at different sizes and line thicknessess.
"""
import numpy as np
import vispy.scene as scene
from vispy.scene import visuals
from vispy import app
n = 500
pos = np.zeros((n, 2))
colors = np.ones((n, 4), dtype=np.float32)
radius, theta, dtheta = 1.0, 0.0, 5.5 / 180.0 * np.pi
for i in range(500):
theta += dtheta
x = radius * np.cos(theta)
y = radius * np.sin(theta)
r = 10.1 - i * 0.02
radius -= 0.45
pos[i] = x/512.+.5, 1.-(y/512.+.5)
pos *= 512
class Canvas(scene.SceneCanvas):
def __init__(self):
scene.SceneCanvas.__init__(
self,
keys='interactive', size=(512, 512),
title="Marker demo [press space to change marker]",
bgcolor='white'
)
self.unfreeze()
self.index = 0
self.markers = visuals.Markers(scaling=False)
self.markers.set_data(pos, face_color=(0, 1, 0))
self.markers.symbol = self.markers.symbols[self.index]
self.text = visuals.Text(self.markers.symbols[self.index],
pos=(80, 15), font_size=14,
color='black', parent=self.scene)
self.freeze()
def on_key_press(self, event):
if event.text == ' ':
self.index = (self.index + 1) % (len(self.markers.symbols))
self.markers.symbol = self.markers.symbols[self.index]
self.text.text = self.markers.symbols[self.index]
self.update()
canvas = Canvas()
grid = canvas.central_widget.add_grid()
vb1 = grid.add_view(row=0, col=0)
vb1.add(canvas.markers)
if __name__ == '__main__':
canvas.show()
app.run()
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