#include<windows.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>
#include<GL/gl.h>
#include<GL/glu.h>
#include<GL/glut.h>
const int screenWidth = 640;
const int screenHeight = 480;
GLdouble A,B,C,D; // values for scaling and shifting
void myInit(void)
{
glClearColor(1.0, 1.0, 1.0, 0.0); //background color is white
glColor3f(0.0f, 0.0f, 0.0f); //drawing color is black
glPointSize(4.0); //a dot is 2 by 2 pixels
//glLineWidth(4.0); //a line is 4 times thicker
//initialize view (simple orthographic projection)
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0,1.0,-1.0, 1.0, -1.0, 1.0);
A = screenWidth/4.0; //Set values for scaling and shifting
B= 0.0;
C=D=screenHeight/2.0;
//set the viewing coordinates
gluOrtho2D(0.0, 640.0, 0.0, 480.0);
}
void myDisplay(void)
{
glClear(GL_COLOR_BUFFER_BIT); //clear the screen
// glRecti(10,10,150,60); //draw a rectangle with background color
/*glBegin(GL_POINTS); //draw three points
{
for(GLint x=0; x<50; x+=2){
if(x<25)
glVertex2i(100+x,x);
else
glVertex2i(x,x+100);
}
}
glEnd();*/
glBegin(GL_POLYGON); //draw lines
{
glColor3f(1.0,0.0,0.0);
glVertex2i(100,50);
glVertex2i(200,130);
glVertex2i(200,70);
// glVertex2i(200,130);
glVertex2i(500,170);
glVertex2i(300,130);
}
glEnd();
glFlush(); //send all output to display
}
int main(int argc, char** argv)
{
glutInit(&argc, argv); //initialize the toolkit
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); //set the display mode
glutInitWindowSize(640,480); //set window size
//set window position on screen
glutInitWindowPosition(100,150);
//open the screen window and set the name
glutCreateWindow(“My First Window”);
//register the callback functions
glutDisplayFunc(myDisplay);
//glutMouseFunc(myMouse);
myInit();
glutMainLoop(); //go into a perpetual loop
//fprintf(stderr, “Hello!\n”);
return 1;
}
