/usr/share/kivy-examples/canvas/mesh_manipulation.py is in python-kivy-examples 1.9.0-3build1.
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Mesh Manipulation Example
=========================
This demonstrates creating a mesh and using it to deform the texture (the
kivy log). You should see the kivy logo with a five sliders to right.
The sliders change the mesh points' x and y offsets, radius, and a
'wobble' deformation's magnitude and speed.
This example is developed in gabriel's blog post at
http://kivy.org/planet/2014/01/kivy-image-manipulations-with-mesh-and-textures/
'''
from kivy.app import App
from kivy.lang import Builder
from kivy.core.image import Image as CoreImage
from kivy.properties import ListProperty, ObjectProperty, NumericProperty
from kivy.clock import Clock
from kivy.core.window import Window
from math import sin, cos, pi
kv = '''
BoxLayout:
Widget:
canvas:
Color:
rgba: 1, 1, 1, 1
Mesh:
vertices: app.mesh_points
indices: range(len(app.mesh_points) // 4)
texture: app.mesh_texture
mode: 'triangle_fan'
BoxLayout:
orientation: 'vertical'
size_hint_x: None
width: 100
Slider:
value: app.offset_x
on_value: app.offset_x = args[1]
min: -1
max: 1
Slider:
value: app.offset_y
on_value: app.offset_y = args[1]
min: -1
max: 1
Slider:
value: app.radius
on_value: app.radius = args[1]
min: 10
max: 1000
Slider:
value: app.sin_wobble
on_value: app.sin_wobble = args[1]
min: -50
max: 50
Slider:
value: app.sin_wobble_speed
on_value: app.sin_wobble_speed = args[1]
min: 0
max: 50
step: 1
'''
class MeshBallApp(App):
mesh_points = ListProperty([])
mesh_texture = ObjectProperty(None)
radius = NumericProperty(500)
offset_x = NumericProperty(.5)
offset_y = NumericProperty(.5)
sin_wobble = NumericProperty(0)
sin_wobble_speed = NumericProperty(0)
def build(self):
self.mesh_texture = CoreImage('data/logo/kivy-icon-512.png').texture
Clock.schedule_interval(self.update_points, 0)
return Builder.load_string(kv)
def update_points(self, *args):
""" replace self.mesh_points based on current slider positions.
Called continuously by a timer because this only sample code.
"""
points = [Window.width / 2, Window.height / 2, .5, .5]
i = 0
while i < 2 * pi:
i += 0.01 * pi
points.extend([
Window.width / 2 + cos(i) * (self.radius + self.sin_wobble
* sin(i * self.sin_wobble_speed)),
Window.height / 2 + sin(i) * (self.radius + self.sin_wobble
* sin(i * self.sin_wobble_speed)),
self.offset_x + sin(i),
self.offset_y + cos(i)])
self.mesh_points = points
if __name__ == '__main__':
MeshBallApp().run()
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