| HOpenGL Libraries (OpenGL package) | Contents | Index
Graphics.Rendering.OpenGL.GL.Rectangles |
Portability | portable
Stability | provisional
Maintainer | sven.panne@aedion.de
Description
This module corresponds to section 2.10 (Rectangles) of the OpenGL 1.5 specs.
Synopsis
class Rect a where
rect :: Vertex2 a -> Vertex2 a -> IO ()
rectv :: Ptr a -> Ptr a -> IO ()
Documentation
class Rect a where
`rect` and `rectv` support efficient specification of rectangles as two corner points. Each rectangle command takes four arguments, organized either as two consecutive pairs of (x, y) coordinates, or as two pointers to arrays, each containing an (x, y) pair. The resulting rectangle is defined in the z = 0 plane. ``rect` (`Vertex2` x1 y1) (`Vertex2` x2, y2)` is exactly equivalent to the following sequence:
        renderPrimitive Polygon $ do
            vertex (Vertex2 x1 y1)
            vertex (Vertex2 x2 y1)
            vertex (Vertex2 x2 y2)
            vertex (Vertex2 x1 y2)
Note that if the second vertex is above and to the right of the first vertex, the rectangle is constructed with a counterclockwise winding.
Methods
rect :: Vertex2 a -> Vertex2 a -> IO ()
rectv :: Ptr a -> Ptr a -> IO ()
Instances
Rect GLdouble
Rect GLfloat
Rect GLint
Rect GLshort
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