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{-
Model.hs (adapted from model.c which is (c) Silicon Graphics, Inc.)
Copyright (c) Sven Panne 2002-2005 <sven.panne@aedion.de>
This file is part of HOpenGL and distributed under a BSD-style license
See the file libraries/GLUT/LICENSE
This program demonstrates modeling transformations.
-}
import System.Exit ( exitWith, ExitCode(ExitSuccess) )
import Graphics.UI.GLUT
myInit :: IO ()
myInit = do
clearColor $= Color4 0 0 0 0
shadeModel $= Flat
drawTriangle :: IO ()
drawTriangle = do
-- resolve overloading, not needed in "real" programs
let vertex2f = vertex :: Vertex2 GLfloat -> IO ()
renderPrimitive LineLoop $ do
vertex2f (Vertex2 0 25 )
vertex2f (Vertex2 25 (-25))
vertex2f (Vertex2 (-25) (-25))
display :: DisplayCallback
display = do
clear [ ColorBuffer ]
-- resolve overloading, not needed in "real" programs
let color3f = color :: Color3 GLfloat -> IO ()
translatef = translate :: Vector3 GLfloat -> IO ()
scalef = scale :: GLfloat -> GLfloat -> GLfloat -> IO ()
rotatef = rotate :: GLfloat -> Vector3 GLfloat -> IO ()
color3f (Color3 1 1 1)
loadIdentity
color3f (Color3 1 1 1)
drawTriangle
lineStipple $= Just (1, 0xF0F0)
loadIdentity
translatef (Vector3 (-20) 0 0)
drawTriangle
lineStipple $= Just (1, 0xF00F)
loadIdentity
scalef 1.5 0.5 1.0
drawTriangle
lineStipple $= Just (1, 0x8888)
loadIdentity
rotatef 90 (Vector3 0 0 1)
drawTriangle
lineStipple $= Nothing
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 ortho (-50) 50 (-50 * hf/wf) (50 * hf/wf) (-1) 1
else ortho (-50 * wf/hf) (50 * wf/hf) (-50) 50 (-1) 1
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
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