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1 import pyglet
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2
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3 class Camera(object):
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4 """Sets the point of view for further renderers by altering the
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5 model/view matrix when it is drawn. It does not actually perform
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6 any drawing itself.
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7
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8 :param position: The position vector for the camera. Sets the center of the view.
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9 :type position: Vec2d
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10 :param angle: Camera rotation in degrees about the z-axis.
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11 :type angle: float
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12 :param zoom: Scaling vector for the coordinate axis.
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13 :type zoom: Vec2d
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14 :param relative: Flag to indicate if the camera settings are relative
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15 to the previous view state. If ``False`` the view state is reset before
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16 setting the camera view by loading the identity model/view matrix.
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17
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18 At runtime the camera may be manipulated via attributes with the
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19 same names and functions as the parameters above.
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20 """
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21
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22 def __init__(self, position=None, angle=None, zoom=None, relative=False):
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23 self.position = position
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24 self.angle = angle
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25 self.zoom = zoom
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26 self.relative = relative
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27
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28 def draw(self, gl=pyglet.gl):
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29 if not self.relative:
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30 gl.glLoadIdentity()
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31 if self.position is not None:
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32 px, py = self.position
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33 gl.glTranslatef(px, py, 0)
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34 if self.angle is not None:
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35 gl.glRotatef(self.angle, 0, 0, 1)
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36 if self.zoom is not None:
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37 sx, sy = self.zoom
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38 gl.glScalef(sx, sy ,0)
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39
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