import sys
import time
from OpenGL.GLUT import *
from OpenGL.GL import *
from OpenGL.GLU import *

def drawBitmapString(text, font=GLUT_BITMAP_TIMES_ROMAN_24):
    for c in text:
        glutBitmapCharacter(font, ord(c))


buttonMinX = 10
buttonMinY = 25
buttonMaxX = 170
buttonMaxY = 80
buttonPressed = 0

def draw():
	global buttonPressed, buttonMinX, buttonMinY, buttonMaxX, buttonMaxY
	glClear(GL_COLOR_BUFFER_BIT)
	glLoadIdentity()
	if buttonPressed:
		glColor3f(1, 0, 0)
	else:
		glColor3f(0, 1, 1)
	glRectf(buttonMinX, buttonMinY, buttonMaxX, buttonMaxY)
	glColor3f(0.4, 0.2, 0.5)
	glRasterPos2f(buttonMinX+10, buttonMinY+10)
	drawBitmapString("Click Me")
	glutSwapBuffers()

def mouseButton(button, state, x, y):
	global buttonPressed, buttonMinX, buttonMinY, buttonMaxX, buttonMaxY
	y = glutGet(GLUT_WINDOW_HEIGHT) - y
	if (button == GLUT_LEFT_BUTTON) and (state == GLUT_DOWN):
		if (x >= buttonMinX) and (x <= buttonMaxX) and \
		   (y >= buttonMinY) and (y <= buttonMaxY):
				buttonPressed = not buttonPressed
				glutPostRedisplay()

def keyboard(key, x, y):
	if key == chr(27):
		sys.exit(0)

def reshape(width, height):
    glViewport(0, 0, width, height)
    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    glOrtho(0, width, 0, height, -100, 100)
    glMatrixMode(GL_MODELVIEW)


glutInit([])
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB)
glutInitWindowSize(400, 400)
glutInitWindowPosition(0,0)
glutCreateWindow(sys.argv[0])
glutReshapeFunc(reshape)
reshape(400,400)
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutMouseFunc(mouseButton)
glutMainLoop()