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