58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
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'''
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Mesh test
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=========
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This demonstrates the use of a mesh mode to distort an image. You should see
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a line of buttons across the bottom of a canvas. Pressing them displays
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the mesh, a small circle of points, with different mesh.mode settings.
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'''
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from kivy.uix.button import Button
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from kivy.uix.widget import Widget
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from kivy.uix.boxlayout import BoxLayout
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from kivy.app import App
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from kivy.graphics import Mesh
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from functools import partial
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from math import cos, sin, pi
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class MeshTestApp(App):
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def change_mode(self, mode, *largs):
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self.mesh.mode = mode
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def build_mesh(self):
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""" returns a Mesh of a rough circle. """
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vertices = []
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indices = []
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step = 10
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istep = (pi * 2) / float(step)
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for i in range(step):
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x = 300 + cos(istep * i) * 100
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y = 300 + sin(istep * i) * 100
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vertices.extend([x, y, 0, 0])
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indices.append(i)
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return Mesh(vertices=vertices, indices=indices)
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def build(self):
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wid = Widget()
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with wid.canvas:
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self.mesh = self.build_mesh()
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layout = BoxLayout(size_hint=(1, None), height=50)
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for mode in ('points', 'line_strip', 'line_loop', 'lines',
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'triangle_strip', 'triangle_fan'):
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button = Button(text=mode)
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button.bind(on_release=partial(self.change_mode, mode))
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layout.add_widget(button)
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root = BoxLayout(orientation='vertical')
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root.add_widget(wid)
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root.add_widget(layout)
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return root
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if __name__ == '__main__':
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MeshTestApp().run()
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