Culori

Cod Sursa Haskell

{-
Smooth.hs (adapted from smooth.c which is (c) Silicon Graphics, Inc.)
Copyright (c) Sven Panne 2002-2005 <svenpanne@gmail.com>
This file is part of HOpenGL and distributed under a BSD-style license
See the file libraries/GLUT/LICENSE

This program demonstrates smooth shading. A smooth shaded polygon is drawn in
a 2-D projection.
-}

import System.Exit ( exitWith, ExitCode(ExitSuccess) )
import Graphics.UI.GLUT

myInit :: IO ()
myInit = do
clearColor $= Color4 0 0 0 0
shadeModel $= Smooth

triangle :: IO ()
triangle =
— resolve overloading, not needed in “real” programs
let vertex2f = vertex :: Vertex2 GLfloat -> IO ()
color3f = color :: Color3 GLfloat -> IO ()
in renderPrimitive Triangles $ do
color3f (Color3 1 0 0)
vertex2f (Vertex2 5 5)
color3f (Color3 0 1 0)
vertex2f (Vertex2 25 5)
color3f (Color3 0 0 1)
vertex2f (Vertex2 5 25)

display :: DisplayCallback
display = do
clear [ ColorBuffer ]
triangle
flush

reshape :: ReshapeCallback
reshape size@(Size w h) = do
viewport $= (Position 0 0, size)
matrixMode $= Projection
loadIdentity
let wf = fromIntegral w
hf = fromIntegral h
if w <= h
then ortho2D 0 30 0 (30 * hf/wf)
else ortho2D 0 (30 * wf/hf) 0 30
matrixMode $= Modelview 0

keyboard :: KeyboardMouseCallback
keyboard (Char ‘\27’) Down _ _ = exitWith ExitSuccess
keyboard _ _ _ _ = return ()

main :: IO ()
main = do
(progName, _args) <- getArgsAndInitialize
initialDisplayMode $= [ SingleBuffered, RGBMode ]
initialWindowSize $= Size 500 500
initialWindowPosition $= Position 100 100
_ <- createWindow progName
myInit
displayCallback $= display
reshapeCallback $= Just reshape
keyboardMouseCallback $= Just keyboard
mainLoop