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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.
# vispy: gallery 2
"""
Simple demonstration of ImageVisual.
"""
import numpy as np
import vispy.app
from vispy import gloo
from vispy import visuals
from vispy.visuals.transforms import (MatrixTransform, STTransform,
arg_to_array, LogTransform,
PolarTransform, BaseTransform)
from image_visual import get_image
class Canvas(vispy.app.Canvas):
def __init__(self):
vispy.app.Canvas.__init__(self, keys='interactive', size=(800, 800))
# Create 4 copies of an image to be displayed with different transforms
image = get_image()
self.images = [visuals.ImageVisual(image, method='impostor')
for i in range(4)]
# Transform all images to a standard size / location (because
# get_image() might return unexpected sizes)
s = 100. / max(self.images[0].size)
tx = 0.5 * (100 - (self.images[0].size[0] * s))
ty = 0.5 * (100 - (self.images[0].size[1] * s))
base_tr = STTransform(scale=(s, s), translate=(tx, ty))
self.images[0].transform = (STTransform(scale=(30, 30),
translate=(600, 600)) *
SineTransform() *
STTransform(scale=(0.1, 0.1),
translate=(-5, -5)) *
base_tr)
tr = MatrixTransform()
tr.rotate(40, (0, 0, 1))
tr.rotate(30, (1, 0, 0))
tr.translate((0, -20, -60))
p = MatrixTransform()
p.set_perspective(0.5, 1, 0.1, 1000)
tr = p * tr
tr1 = (STTransform(translate=(200, 600)) *
tr *
STTransform(translate=(-50, -50)) *
base_tr)
self.images[1].transform = tr1
tr2 = (STTransform(scale=(3, -100), translate=(200, 50)) *
LogTransform((0, 2, 0)) *
STTransform(scale=(1, -0.01), translate=(-50, 1.1)) *
base_tr)
self.images[2].transform = tr2
tr3 = (STTransform(scale=(400, 400), translate=(570, 400)) *
PolarTransform() *
STTransform(scale=(np.pi/150, -0.005),
translate=(-3.3*np.pi/4., 0.7)) *
base_tr)
self.images[3].transform = tr3
text = visuals.TextVisual(
text=['logarithmic', 'polar', 'perspective', 'custom (sine)'],
pos=[(100, 20), (500, 20), (100, 410), (500, 410)],
color='k', font_size=16)
self.visuals = self.images + [text]
self.show()
def on_draw(self, ev):
gloo.clear(color='w', depth=True)
for vis in self.visuals:
vis.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)
for vis in self.visuals:
vis.transforms.configure(canvas=self, viewport=vp)
# A simple custom Transform
class SineTransform(BaseTransform):
"""
Add sine wave to y-value for wavy effect.
"""
glsl_map = """
vec4 sineTransform(vec4 pos) {
return vec4(pos.x, pos.y + sin(pos.x), pos.z, 1);
}"""
glsl_imap = """
vec4 sineTransform(vec4 pos) {
return vec4(pos.x, pos.y - sin(pos.x), pos.z, 1);
}"""
Linear = False
@arg_to_array
def map(self, coords):
ret = coords.copy()
ret[..., 1] += np.sin(ret[..., 0])
return ret
@arg_to_array
def imap(self, coords):
ret = coords.copy()
ret[..., 1] -= np.sin(ret[..., 0])
return ret
def inverse(self):
return InvSineTransform()
class InvSineTransform(BaseTransform):
glsl_map = SineTransform.glsl_imap
glsl_imap = SineTransform.glsl_map
Linear = False
map = SineTransform.imap
imap = SineTransform.map
def inverse(self):
return SineTransform()
if __name__ == '__main__':
win = Canvas()
import sys
if sys.flags.interactive != 1:
vispy.app.run()
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