def set_ortho(self, extent):
design_height = 600
self.ortho_extent = extent
left = -extent * self.aspect
right = extent * self.aspect
top = extent
bottom = -extent
near = 0.0
far = 1000.0
self.projection_ortho = Matrix.from_ortho(left, right, bottom, top,
near, far)
def get_screen_view_projection(self):
design_height = 600
height = design_height
width = design_height * self.aspect
return Matrix.from_ortho(0.0, width, 0.0, height, -1.0, 1.0)