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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.
# -----------------------------------------------------------------------------
"""
Demonstration of ability to scatter text parts and assign different colors.
"""
import sys
from vispy import app, gloo, visuals
import numpy as np
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, keys='interactive',
size=(800, 800))
self.n_iterations = 0
self.text_parts = [
'This',
'is',
'a',
'multicolored',
'scattered',
'text']
self.x = 100 + np.arange(len(self.text_parts))*100
self.y = 400 + (np.sin(2 * np.pi * (self.x/self.x[-1]))*100)
self.text_positions = np.c_[self.x, self.y]
color = np.ones((len(self.text_parts), 4), dtype=np.float32)
color[:, 0] = np.linspace(0, 1, len(self.text_parts))
color[:, 1] = color[::-1, 0]
self.colors = color
self.text = visuals.TextVisual(self.text_parts, bold=True,
pos=self.text_positions,
color=self.colors)
def on_draw(self, event):
gloo.clear(color='white')
gloo.set_viewport(0, 0, *self.physical_size)
self.text.draw()
def on_resize(self, event):
# Set canvas viewport and reconfigure visual transforms to match.
vp = (0, 0, self.physical_size[0], self.physical_size[1])
self.context.set_viewport(*vp)
self.text.transforms.configure(canvas=self, viewport=vp)
if __name__ == '__main__':
c = Canvas()
c.show()
def update(ev):
x = c.text.pos[:, 0]
y = 400 + (np.sin(2 * np.pi * ((x/x[-1]))+(c.n_iterations/5))*100)
color = np.ones((len(c.text_parts), 4), dtype=np.float32)
color[:, 0] = np.linspace(0, 1, len(c.text_parts))
color[:, 1] = color[::-1, 0]
color = np.roll(color, c.n_iterations // len(color), axis=0)
c.text.pos = np.c_[x, y]
c.text.color = color
c.update()
c.n_iterations += 1
timer = app.Timer()
timer.connect(update)
timer.start(0.1)
if sys.flags.interactive != 1:
app.run()
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