DDA.py

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

def draw_axes():
    glColor3f(1.0, 1.0, 1.0)  # White color for axes
    glBegin(GL_LINES)
    glVertex2f(-10, 0)  # x-axis
    glVertex2f(10, 0)
    glVertex2f(0, -10)  # y-axis
    glVertex2f(0, 10)
    glEnd()

def draw_points(x, y):
    glColor3f(1.0, 0.0, 0.0)  # Red color for points
    glPointSize(4)
    glBegin(GL_POINTS)
    glVertex2f(x, y)
    glEnd()

def display():
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
    glLoadIdentity()
    
    draw_axes()
    # Display a line starting from (1, 1) to (6,6)
    x1 = 1
    y1 = 1
    x2 = 3
    y2 = 7
    x = x1
    y = y1
    m = (y2-y1)/(x2-x1)
    while x <= x2 :
        draw_points(x, y)
        if m <= 1:
            x = x + 1/100
            y = y + m/100
        else:
            y = y + 1/100
            x = x + (1/m)/100
    
    glFlush()
    glutSwapBuffers()

def reshape(width, height):
    glViewport(0, 0, width, height)
    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    glOrtho(-10, 10, -10, 10, -1, 1)
    glMatrixMode(GL_MODELVIEW)


glutInit()  # Initialize GLUT
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH)
glutInitWindowSize(500, 500)
glutCreateWindow(b"Plotting with PyOpenGL")
glEnable(GL_DEPTH_TEST)
glClearColor(0.0, 0.0, 0.0, 1.0)
glutDisplayFunc(display)
glutReshapeFunc(reshape)
glutMainLoop()