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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.
# -----------------------------------------------------------------------------
"""
This example demonstrates how to draw curved lines (bezier).
"""
import sys
from vispy import app, gloo, visuals
from vispy.geometry import curves
from vispy.visuals.transforms import STTransform, NullTransform
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, title='Bezier lines example',
keys='interactive', size=(400, 750))
self.lines = [
visuals.LineVisual(curves.curve4_bezier(
(10, 0),
(50, -190),
(350, 190),
(390, 0)
), color='w', width=2, method='agg'),
visuals.LineVisual(curves.curve4_bezier(
(10, 0),
(190, -190),
(210, 190),
(390, 0)
), color='w', width=2, method='agg'),
visuals.LineVisual(curves.curve3_bezier(
(10, 0),
(30, 200),
(390, 0)
), color='w', width=2, method='agg')
]
# Translate each line visual downwards
for i, line in enumerate(self.lines):
x = 0
y = 200 * (i + 1)
line.transform = STTransform(translate=[x, y])
self.texts = [
visuals.TextVisual('Third order curve', bold=True, color='w',
font_size=14, pos=(200, 75)),
visuals.TextVisual('Quadratic curve', bold=True, color='w',
font_size=14, pos=(200, 525)),
]
for text in self.texts:
text.transform = NullTransform()
self.visuals = self.lines + self.texts
self.show()
def on_draw(self, event):
gloo.clear('black')
gloo.set_viewport(0, 0, *self.physical_size)
for visual in self.visuals:
visual.draw()
def on_resize(self, event):
vp = (0, 0, self.physical_size[0], self.physical_size[1])
self.context.set_viewport(*vp)
for visual in self.visuals:
visual.transforms.configure(canvas=self, viewport=vp)
if __name__ == '__main__':
win = Canvas()
if sys.flags.interactive != 1:
app.run()
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