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# -*- coding: utf-8 -*-
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
"""
Demonstration of how to interact with visuals, here with simple
arcball-style control.
"""
import sys
import numpy as np
from vispy import app
from vispy.visuals import BoxVisual, transforms
from vispy.util.quaternion import Quaternion
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, 'Cube', keys='interactive',
size=(400, 400))
self.cube = BoxVisual(1.0, 0.5, 0.25, color='red',
edge_color='black')
self.cube.transform = transforms.MatrixTransform()
self.cube.transform.scale((100, 100, 0.001))
self.cube.transform.translate((200, 200))
self.quaternion = Quaternion()
self.show()
def on_resize(self, event):
vp = (0, 0, self.physical_size[0], self.physical_size[1])
self.context.set_viewport(*vp)
self.cube.transforms.configure(canvas=self, viewport=vp)
def on_draw(self, event):
self.context.clear('white')
self.cube.draw()
def on_mouse_move(self, event):
if event.button == 1 and event.last_event is not None:
x0, y0 = event.last_event.pos
x1, y1 = event.pos
w, h = self.size
self.quaternion = (self.quaternion *
Quaternion(*_arcball(x0, y0, w, h)) *
Quaternion(*_arcball(x1, y1, w, h)))
self.cube.transform.matrix = self.quaternion.get_matrix()
self.cube.transform.scale((100, 100, 0.001))
self.cube.transform.translate((200, 200))
self.update()
def _arcball(x, y, w, h):
"""Convert x,y coordinates to w,x,y,z Quaternion parameters
Adapted from:
linalg library
Copyright (c) 2010-2015, Renaud Blanch <rndblnch at gmail dot com>
Licence at your convenience:
GPLv3 or higher <http://www.gnu.org/licenses/gpl.html>
BSD new <http://opensource.org/licenses/BSD-3-Clause>
"""
r = (w + h) / 2.
x, y = -(2. * x - w) / r, -(2. * y - h) / r
h = np.sqrt(x*x + y*y)
return (0., x/h, y/h, 0.) if h > 1. else (0., x, y, np.sqrt(1. - h*h))
if __name__ == '__main__':
win = Canvas()
win.show()
if sys.flags.interactive != 1:
win.app.run()
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