Skip to content

Instantly share code, notes, and snippets.

@Svastikkka

Svastikkka/Ellipse.c

Last active November 18, 2018 01:48
Show Gist options
  • Save Svastikkka/7c1a1b2db782eb159b0f7bbde21bfcf1 to your computer and use it in GitHub Desktop.
Save Svastikkka/7c1a1b2db782eb159b0f7bbde21bfcf1 to your computer and use it in GitHub Desktop.
Download ZIP
Computer Graphics sample projects written in c using OpenGl
Raw
circle.c
#include<GL/glut.h>
#include<GL/gl.h>
#include<math.h>
void init(){
glClearColor(1.0,1.0,1.0,1.0);
glMatrixMode(GL_PROJECTION);
gluOrtho2D(-100.0,100.0,-100.0,100.0);
}
void points(int xc,int yc,int x,int y)
{
glColor3f(0.5,0.5,0.5);
glVertex2i(xc+x,yc+y);
glColor3f(1.0,0.0,1.0);
glVertex2i(xc-x,yc+y);
glColor3f(0.0,0.0,1.0);
glVertex2i(xc+x,yc-y);
glColor3f(0.0,1.0,0.0);
glVertex2i(xc-x,yc-y);
glColor3f(0.0,1.0,1.0);
glVertex2i(xc+y,yc+x);
glColor3f(0.0,0.0,0.0);
glVertex2i(xc-y,yc+x);
glColor3f(1.0,1.0,0.0);
glVertex2i(xc+y,yc-x);
glColor3f(1.0,0.0,0.0);
glVertex2i(xc-y,yc-x);
}
void circle(int ra)
{
int x=0;
int y=ra;
int p=1-ra;
while(x<=y)
{
x++;
p=p+2*x+1;
if(p>0)
{
y--;
p=p-2*y;
}
points(0,0,x,y);
}
}
void midpointcircle(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glPointSize(2.0);
glBegin(GL_POINTS);
glColor3f(0.0,1.0,0.0);
circle(25);
circle(50);
glEnd();
glLineWidth(1.0);
glBegin(GL_LINES);
// this is create a vertical line
glVertex2i(-20,-52);
glVertex2i(20,-52);
// this is create a horizontal line
glVertex2i(-20,-52);
glVertex2i(-20,-80);
glVertex2i(20,-52);
glVertex2i(20,-80);
// this is create a vertical line
glVertex2i(-40,-80);
glVertex2i(40,-80);
// this is create a horizontal line
glVertex2i(-40,-80);
glVertex2i(-40,-100);
// this is create a vertical line
glVertex2i(-40,-100);
glVertex2i(40,-100);
// this is create a horizontal line
glVertex2i(40,-80);
glVertex2i(40,-100);
glEnd();
glFlush();
}
int main(int argc, char**argv)
{
glutInit(&argc,argv);
glutInitWindowPosition(20,20);
glutInitWindowSize(512,512);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutCreateWindow(" Manshu Sharma ' s circle");
glutDisplayFunc(midpointcircle);
glutMainLoop();
return 0;
}
Raw
clock.c
#include<GL/glut.h>
#include<GL/gl.h>
#include<math.h>
void init()
{
glClearColor(100.0,100.0,100.0,100.0);
glMatrixMode(GL_PROJECTION);
gluOrtho2D(-100.0,100.0,-100.0,100.0);
}
void watch()
{
glClear(GL_COLOR_BUFFER_BIT);
float x1=0.0,y1=0.0,r=80.0,angle,x2,y2;
glBegin(GL_TRIANGLE_FAN);
glColor3f(6.0,6.0,6.0);
glLineWidth(10.0);
glVertex2f(x1,y1);
for(angle=0;angle<=360;angle++)
{
x2=x1+r*cos(angle);
y2=y1+r*sin(angle);
glVertex2f(x2,y2);
}
glEnd();
glBegin(GL_LINE_LOOP);
glColor3f(0.0,0.0,0.0);
glVertex2i(-5,65);
glVertex2i(-5,75);
glEnd();
glBegin(GL_LINES);
glColor3f(0.0,0.0,0.0);
glVertex2i(0,75);
glVertex2i(5,75);
glVertex2i(5,75);
glVertex2i(5,70);
glVertex2i(5,70);
glVertex2i(0,70);
glVertex2i(0,70);
glVertex2i(0,65);
glVertex2i(0,65);
glVertex2i(5,65);
glEnd();
glBegin(GL_LINES);
glColor3f(0.0,0.0,0.0);
glVertex2i(65,5);
glVertex2i(75,5);
glVertex2i(75,5);
glVertex2i(75,-5);
glVertex2i(75,-5);
glVertex2i(65,-5);
glVertex2i(67,0);
glVertex2i(75,0);
glEnd();
glBegin(GL_LINES);
glColor3f(0.0,0.0,0.0);
glVertex2i(-5,-65);
glVertex2i(5,-65);
glVertex2i(-5,-65);
glVertex2i(-5,-75);
glVertex2i(-5,-75);
glVertex2i(5,-75);
glVertex2i(5,-75);
glVertex2i(5,-70);
glVertex2i(5,-70);
glVertex2i(-5,-70);
glEnd();
glBegin(GL_LINES);
glColor3f(0.0,0.0,0.0);
glVertex2i(-75,5);
glVertex2i(-65,5);
glVertex2i(-65,5);
glVertex2i(-65,-5);
glVertex2i(-65,-5);
glVertex2i(-75,-5);
glVertex2i(-75,5);
glVertex2i(-75,0);
glVertex2i(-75,0);
glVertex2i(-65,0);
glEnd();
glBegin(GL_LINES);
glColor3f(0.0,0.0,0.0);
glVertex2i(0,0);
glVertex2i(0,60);
glVertex2i(0,0);
glVertex2i(-35,0);
glVertex2i(0,0);
glVertex2i(30,45);
glEnd();
glFlush();
}
int main(int argc,char **argv)
{
glutInit(&argc,argv);
glutInitWindowPosition(20,20);
glutInitWindowSize(200,200);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutCreateWindow("Manshu'S clock");
init();
glutDisplayFunc(watch);
glutMainLoop();
return 0;
}
Raw
Ellipse.c
/*
*this program is design by manshu sharma as help to other students you can copy this and display as your project
*step1 :- int rx=80, ry=20, xc=0, yc=ry;// radius x ,radius y center of x = 0 center of y = radius of y
*step2 :- float p=(ry*ry)-(rx*rx*ry)+((0.25)*(rx*rx));
*step3 :- apply a while loop with condition (2*ry*ry*xc)<=(2*rx*rx*yc)
*step4 :- In that while loop apply two conditions p<0
*step5 :- while((2*ry*ry*xc)<=(2*rx*rx*yc)){
* if(p<0){
* xc++;
* p=p+(2*ry*ry*xc)+(3*ry*ry);
* }
* else{
* xc++;
* yc--;
*
* p=p+((2*ry*ry*xc)+(3*ry*ry))-((2*rx*rx*yc)+(2*rx*rx));
* }
* glVertex2i(xc,yc);
* glVertex2i(xc,-yc);
* glVertex2i(-xc,yc);
* glVertex2i(-xc,-yc);
* }
*step6 :- apply a 2 while loop with condition yc!=0
*step7 :-
*/
#include<GL/glut.h>
#include<GL/gl.h>
#include<math.h>
void init(void)
{
glClearColor(1.0,1.0,1.0,0.0);
glMatrixMode(GL_PROJECTION);
gluOrtho2D(-100.0,100.0,-100.0,100.0);
}
void ellipsefunc()
{
int rx=80, ry=20, xc=0, yc=ry;// radius x ,radius y center of x = 0 center of y = radius of y
float p=(ry*ry)-(rx*rx*ry)+((0.25)*(rx*rx)); //formula 1
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0.0,0.0,1.0);
glPointSize(2.0);
glBegin(GL_POINTS);
while((2*ry*ry*xc)<=(2*rx*rx*yc)){
if(p<0){
xc++;
p=p+(2*ry*ry*xc)+(3*ry*ry);
}
else{
xc++;
yc--;
p=p+((2*ry*ry*xc)+(3*ry*ry))-((2*rx*rx*yc)+(2*rx*rx));
}
glVertex2i(xc,yc);
glVertex2i(xc,-yc);
glVertex2i(-xc,yc);
glVertex2i(-xc,-yc);
}
float p1 = (ry*ry*(xc+0.5)*(xc+0.5))+(rx*rx*(yc-1)*(yc-1))-(rx*rx*ry*ry*ry);//formula 2
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0,0.0,0.0);
glPointSize(2.0);
glBegin(GL_POINTS);
while(yc!=0){
if(p1>0){
yc--;
p1=p1-((2*rx*rx*yc)-(2*rx*rx))+(rx*rx);
}
else{
yc--;
xc++;
p1=p1-((2*rx*rx*yc)+(2*rx*rx))+(rx*rx)-((2*ry*ry*xc)-(2*ry*ry));
}
glVertex2i(xc,yc);
glVertex2i(xc,-yc);
glVertex2i(-xc,yc);
glVertex2i(-xc,-yc);
}
glEnd();
glFlush();
}
int main(int argc ,char **argv)
{
glutInit(&argc, argv);
glutInitWindowPosition(2,2);
glutInitWindowSize(700,700);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutCreateWindow(" Manshu's Ellipse");
init();
glutDisplayFunc(ellipsefunc);
glutMainLoop();
return 0;
}
@Svastikkka
Copy link
Author

Computer Graphics sample projects written in c using OpenGl

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment