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# Show color quad Image

Create a new drawing using triangle_strip

    from vispy import app, gloo
    from vispy.gloo import Program

    vertex = """
        attribute vec4 color;
        attribute vec2 position;
        varying vec4 v_color;
        void main()
        {
            gl_Position = vec4(position, 0.0, 1.0);
            v_color = color;
        } """

    fragment = """
        varying vec4 v_color;
        void main()
        {
            gl_FragColor = v_color;
        } """

    class Canvas(app.Canvas):
        def __init__(self):
            super().__init__(size=(512, 512), title='Colored quad',
                             keys='interactive')

            # Build program
            self.program = Program(vertex, fragment, count=4)

            # Set uniforms and attributes
            self.program['color'] = [(1, 0, 0, 1), (0, 1, 0, 1),
                                     (0, 0, 1, 1), (1, 1, 0, 1)]
            self.program['position'] = [(-1, -1), (-1, +1),
                                        (+1, -1), (+1, +1)]

            gloo.set_viewport(0, 0, *self.physical_size)

            self.show()

        def on_draw(self, event):
            gloo.clear()
            self.program.draw('triangle_strip')

        def on_resize(self, event):
            gloo.set_viewport(0, 0, *event.physical_size)

    c = Canvas()

    if __name__ == '__main__':
        app.run()

Total running time of the script: (0 minutes 0.505 seconds)

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