"""Test simple functions (i.e. no pointers involved)"""
from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *
import time
start = time.time()

window = None

def drawText( value, x,y,  windowHeight, windowWidth, step = 18 ):
	"""Draw the given text at given 2D position in window
	"""
	glMatrixMode(GL_PROJECTION);
	# For some reason the GL_PROJECTION_MATRIX is overflowing with a single push!
	# glPushMatrix()
	matrix = glGetDouble( GL_PROJECTION_MATRIX )
	
	glLoadIdentity();
	glOrtho(0.0, windowHeight or 32, 0.0, windowWidth or 32, -1.0, 1.0)
	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glLoadIdentity();
	glRasterPos2i(x, y);
	lines = 0
	for character in value:
		if character == '\n':
			glRasterPos2i(x, y-(lines*18))
		else:
			glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, ord(character));
	glPopMatrix();
	glMatrixMode(GL_PROJECTION);
	# For some reason the GL_PROJECTION_MATRIX is overflowing with a single push!
	# glPopMatrix();
	glLoadMatrixd( matrix ) # should have un-decorated alias for this...
	
	glMatrixMode(GL_MODELVIEW);

def display():
	glutSetWindow(window);
	glClearColor (0.0, 0.0, (time.time()%1.0)/1.0, 0.0)
	glClear (GL_COLOR_BUFFER_BIT)
	drawText( 'hello', 20,20, size[0],size[1] )
	#glutBitmapCharacter( GLUT_BITMAP_8_BY_13, ord('a'))
	glutSolidTeapot( .2 )
	glFlush ()
	glutSwapBuffers()

size = (250,250)

def reshape( *args ):
	print 'reshape', args
	global size 
	size = args
	display()

def ontimer( *args ):
	print 'timer', args, '@time', time.time()-start
	glutTimerFunc( 1000, ontimer, 24 )

def idle():
	if time.time()-start < 10:
		glutSetWindow(window)
		glutPostRedisplay()
	else:
		glutDestroyWindow( window )
		print 'window destroyed'
		import sys
		sys.exit( 0 )

def testFunction( name ):
	def onevent( *args ):
		print '%s -> %s'%(name, ", ".join( [str(a) for a in args ]))
	return onevent

if __name__ == "__main__":
	import sys
	newArgv = glutInit(sys.argv)
	print 'newArguments', newArgv
	glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGB )
	glutInitWindowSize(250, 250)
	glutInitWindowPosition(100, 100)
	window = glutCreateWindow("hello")
	print 'window', repr(window)
	glutDisplayFunc(display)
	glutReshapeFunc(reshape)
	glutMouseFunc(testFunction( 'Mouse' ))
	glutEntryFunc(testFunction( 'Entry' ))
	glutKeyboardFunc( testFunction( 'Keyboard' ))
	glutKeyboardUpFunc( testFunction( 'KeyboardUp' ))
	glutMotionFunc( testFunction( 'Motion' ))
	glutPassiveMotionFunc( testFunction( 'PassiveMotion' ))
	glutVisibilityFunc( testFunction( 'Visibility' ))
	glutWindowStatusFunc( testFunction( 'WindowStatus' ))
	glutSpecialFunc( testFunction( 'Special' ))
	glutSpecialUpFunc( testFunction( 'SpecialUp' ))
	glutTimerFunc( 1000, ontimer, 23 )
	
	glutIdleFunc( idle )
	glutMainLoop()
