Computer-Graphics/DDA.c at master · cyclo-alkane/Computer-Graphics · GitHub

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//Drawing a line using DDA algorithm


#include<GL/glut.h>
#include<math.h>
#include<stdio.h>
void display()
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0.956, 0.901, 0.901);
glPointSize(5);
 float dx=0,dy=0,x0,y0,x1,y1,x=0,y=0,xin=0,yin=0,step=0,m=0,temp1=0,temp2=0;
  printf("enter the value of x0,y0: ");
  scanf("%f %f",&x0,&y0);
  printf("enter the value of x1,y1: ");
  scanf("%f %f",&x1,&y1);
  if(x0<x1){
    }else{
     temp1=x0;
     x0=x1;
     x1=temp1;
   }
   if(y0<y1){

  }else{
     temp2=y0;
     y0=y1;
     y1=temp2;
   }
    dx=x1-x0;
    dy=y1-y0;
    m=dy/dx;
    if(dx>dy){
        step=dx;
    }else{
        step=dy;
    }
    xin=dx/step;
    yin=dy/step;
    glBegin(GL_POINTS);
    glVertex2d(round(x0),round(y0));
     if(m<1 ){
        while(x<=x1){
            if(x==0){
                x=x0+xin;
                y=y0+yin;
            }else{
                x=x+xin;
                y=y+yin;
            }
            glVertex2d(round(x),round(y));
        }
    }
    else if(m>1){
        while(y<=y1){
            if(x==0){
                x=x0+xin;
                y=y0+yin;
            }else{
                x=x+xin;
                y=y+yin;
            }
           glVertex2d(round(x),round(y));
        }
    }
    else if(m==1){
        while(x<=x1|| y<=y1){
            if(x==0){
                x=x0+xin;
                y=y0+yin;
            }else{
                x=x+xin;
                y=y+yin;
            }
        glVertex2d(round(x),round(y));
        }
       }
       else if(x0==x1){
        while(y<=y1){
            if(y==0){
                x=x0+xin;
                y=y0+yin;
            }else{
                x=x+xin;
                y=y+yin;
            }
        glVertex2d(round(x),round(y));
        }
       }
    glEnd();

glFlush();
}
int main(int argc,char** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutInitWindowSize(900,900);
glutInitWindowPosition(300,500);
glutCreateWindow("Task 5");
glClearColor(0.529, 0.921, 0.972,1);
gluOrtho2D(-500,500,-500,500);
glutDisplayFunc(display);
glutMainLoop();
return 0;
}