Computer Graphics and Multimedia lab report

SECTION-A:::::::::::::::::
PROGRAM-1::::::::::::::
Program Title:
Write a program to implement DDA line drawing algorithm.
Source Code:
#include <windows.h>
#include <gl/glut.h>
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_POINTS);
int x1 = 10, y1 = 10, x2 = 100, y2 = 100, x, y, xend, dx, dy;
float m, b;
dx = x2 -x1;
dy = y2 -y1;
m = dy / dx;
b = y1 - m*x1;
if(dx < 0) {
x = x2;
y = y2;
xend = x1;
} else {
x = x1;
y = y1;
xend = x2;
}
while(x < xend){
glVertex2i(x,y);
x = x+1;
y = m * x + b;
}
glEnd();
glFlush();
}

int main(int argc,char *argv[])
{
glutInit(&argc,argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize (500, 500);
glutInitWindowPosition (100, 100);
glutCreateWindow ("points");
glClearColor(0,0,0,0.0);
glMatrixMode (GL_PROJECTION);
gluOrtho2D (0.0, 200.0, 0.0, 150.0);
glutDisplayFunc(display);
glutMainLoop();
return 0;
}
Output:
PROGRAM-2::::::::::::::
Program Title:
Write a program to implement Bresenhams line drawing algorithm.
Source Code:

#include <GL/glut.h>
void display(void)
{
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_POINTS);
int x1 = 60, y1 = 40, x2 = 120, y2 = 120, x, y, xend, dx, dy, inc1, inc2, d;
dx = x2 -x1;
dy = y2 -y1;
inc1 = 2 * dy;
inc2 = 2 * (dy-dx);
d = inc1 - dx;
if(dx < 0) {
x = x2;
y = y2;
xend = x1;
} else {
x = x1;
y = y1;
xend = x2;
}

glVertex2i(x,y);
while(x <= xend){
if(d<0)
{
d = d + inc1;
}
else {
d = d + inc2;
y = y + 1;
}
x = x + 1;
glVertex2i(x,y);
}
glEnd();
glFlush();
}
{

glClearColor (0,0,0,0.0);
gluOrtho2D (0.0, 200.0, 0.0, 150.0);
glutMainLoop();
return 0;
}
Output:
PROGRAM-3::::::::::::::
Program Title:
Write a program to implement Bresenhams circle drawing algorithm.
Source Code:
#include <GL/glut.h>

#include<math.h>
void display(void)
{
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_POINTS);
int x, y, r= 40, h = 100, k= 80, d;
x = 0;
y = r;
d = 3 - (2*r);
while(x < y){
glVertex2i(x+h, y+k);
glVertex2i(y+h, x+k);
glVertex2i(h-y, x+k);
glVertex2i(h-x, y+k);
glVertex2i(h-x, k-y);
glVertex2i(h-y, k-x);
glVertex2i(y+h, k-x);

glVertex2i(x+h, k-y);
if (d < 0){
d = d + (4 * x) + 6;
x = x + 1;
}
else{
d = d + (4 * (x - y)) + 10;
x = x + 1;
y = y -1;
}
}
glEnd();
glFlush();
}
{
glClearColor(0,0,0,0.0);

gluOrtho2D (0.0, 200.0, 0.0, 150.0);
glutMainLoop();
return 0;
}
Output:
PROGRAM-4::::::::::::::
Program Title:
Write a program to implement midpoint ellipse drawing algorithm.
Source Code:
#include<stdio.h>
#include<conio.h>
#include<graphics.h>

void drawEllipse(float xc, float yc, float x, float y)
{
putpixel(xc+x, yc+y, RED);
putpixel(xc-x, yc+y, RED);
putpixel(xc+x, yc-y, RED);
putpixel(xc-x, yc-y, RED);
}
void ellipseMidpoint(float xc, float yc, float rx, float ry)
{
float rxSq = rx * rx;
float rySq = ry * ry;
float x = 0, y = ry, p;
float px = 0, py = 2 * rxSq * y;
drawEllipse(xc, yc, x, y);
p = rySq - (rxSq * ry) + (0.25 * rxSq);
while (px < py)
{
x++;
px = px + 2 * rySq;
if (p < 0)
p = p + rySq + px;
else
{
y--;
py = py - 2 * rxSq;
p = p + rySq + px - py;

}
}
p = rySq*(x+0.5)*(x+0.5) + rxSq*(y-1)*(y-1) - rxSq*rySq;
while (y > 0)
{
y--;
py = py - 2 * rxSq;
if (p > 0)
p = p + rxSq - py;
else
{
x++;
px = px + 2 * rySq;
p = p + rxSq - py + px;
}
}
}
int main()
{
int xc, yc, rx, ry;
int gd = DETECT, gm;
initgraph(&gd, &gm, "c:tcbgi");
printf("tttMID POINT ELLIPSE DRAWING ALGORITHMnntEnter the center coordinates of ellipse:");
scanf("%d %d",&xc,&yc);

printf("ntEnter x-radius coordinate:");
scanf("%d",&rx);
printf("ntEnter y-radius coordinate:");
scanf("%d",&ry);
ellipseMidpoint(xc, yc, rx, ry);
getch();
closegraph();
return 0;
}
Input:

Output:
PROGRAM-5::::::::::::::
Program Title:
Write a program to draw a house.
Source Code:
#include<GL/glu.h>
#include<GL/glut.h>
#include<windows.h>
void init(void)
{
glClearColor(0.0, 0.0, 0.0, 0.0);
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0.0, 200.0, 0.0, 150.0);
}

void buildHouse(void)
{
glColor3f(1.0, 0.0, 0.0);
glBegin(GL_POLYGON); //start house
glColor3f(1.0, 1.0, 0.0);
glVertex2i(50, 0);
glColor3f(0.0, 1.0, 0.0);
glVertex2i(50, 100);
glColor3f(0.0, 1.0, 1.0);
glColor3f(1.0, 1.0, 0.0);
glVertex2i(150,0);
glEnd(); //end house
glBegin(GL_POLYGON); //start window
glColor3f(0.3, 0.2, 0.0);
glVertex2i(60, 80);
glVertex2i(80, 80);
glVertex2i(80, 65);
glVertex2i(60, 65);
glEnd(); //end window
glBegin(GL_POLYGON); //start window
glColor3f(0.3, 0.2, 0.0);

glEnd(); //end window
glBegin(GL_POLYGON); //start ceiling
glColor3f(0.8, 0.0, 0.0);
glColor3f(0.5, 0.0, 0.3);
glColor3f(1.0, 0.0, 0.0);
glEnd(); //end ceiling
glBegin(GL_POLYGON); //start door
glColor3f(0.3, 0.2, 0.0);
glVertex2i(80, 0);
glVertex2i(80, 50);
glVertex2i(120,0);
glEnd(); //end door
glFlush();
}
int main(int argc, char** argv)

{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowPosition(50, 100);
glutInitWindowSize(500, 500);
glutCreateWindow("House Section OpenGL");
init();
glutDisplayFunc(buildHouse);
glutMainLoop();
return 0;
}
Output:
Hay listen carefully, don’t draw this home with your own color, just use pencil.

SECTION-B:::::::::::::::::
PROGRAM-1::::::::::::::
Program Title:
Write a program to implement Cohen Sutherland Line Clipping algorithm.
Source Code:
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include<dos.h>
typedef struct coordinate
{
int x,y;
char code[4];
}PT;
void drawwindow();
void drawline(PT p1,PT p2);
PT setcode(PT p);
int visibility(PT p1,PT p2);
PT resetendpt(PT p1,PT p2);
int main()
{
int gd=DETECT,v,gm;
PT p1,p2,p3,p4,ptemp;

printf("nEnter x1 and y1n");
scanf("%d %d",&p1.x,&p1.y);
printf("nEnter x2 and y2n");
scanf("%d %d",&p2.x,&p2.y);
initgraph(&gd,&gm,"c:turboc3bgi");
drawwindow();
delay(500);
drawline(p1,p2);
delay(500);
cleardevice();
delay(500);
p1=setcode(p1);
p2=setcode(p2);
v=visibility(p1,p2);
delay(500);
switch(v)
{
case 0: drawwindow();
delay(500);
drawline(p1,p2);
break;
case 1: drawwindow();

delay(500);
break;
case 2: p3=resetendpt(p1,p2);
p4=resetendpt(p2,p1);
drawwindow();
delay(500);
drawline(p3,p4);
break;
}
delay(5000);
closegraph();
}
void drawwindow()
{
line(150,100,450,100);
line(450,100,450,350);
line(450,350,150,350);
line(150,350,150,100);
}
void drawline(PT p1,PT p2)
{
line(p1.x,p1.y,p2.x,p2.y);
}

PT setcode(PT p) //for setting the 4 bit code
{
PT ptemp;
if(p.y<100)
ptemp.code[0]='1'; //Top
else
ptemp.code[0]='0';
if(p.y>350)
ptemp.code[1]='1'; //Bottom
else
ptemp.code[1]='0';
if(p.x>450)
ptemp.code[2]='1'; //Right
else
ptemp.code[2]='0';
if(p.x<150)
ptemp.code[3]='1'; //Left
else
ptemp.code[3]='0';
ptemp.x=p.x;
ptemp.y=p.y;

return(ptemp);
}
int visibility(PT p1,PT p2)
{
int i,flag=0;
for(i=0;i<4;i++)
{
if((p1.code[i]!='0') || (p2.code[i]!='0'))
flag=1;
}
if(flag==0)
return(0);
for(i=0;i<4;i++)
{
if((p1.code[i]==p2.code[i]) && (p1.code[i]=='1'))
flag='0';
}
if(flag==0)
return(1);
return(2);
}

PT resetendpt(PT p1,PT p2)
{
PT temp;
int x,y,i;
float m,k;
if(p1.code[3]=='1')
x=150;
if(p1.code[2]=='1')
x=450;
if((p1.code[3]=='1') || (p1.code[2]=='1'))
{
m=(float)(p2.y-p1.y)/(p2.x-p1.x);
k=(p1.y+(m*(x-p1.x)));
temp.y=k;
temp.x=x;
for(i=0;i<4;i++)
temp.code[i]=p1.code[i];
if(temp.y<=350 && temp.y>=100)
return (temp);
}

if(p1.code[0]=='1')
y=100;
if(p1.code[1]=='1')
y=350;
if((p1.code[0]=='1') || (p1.code[1]=='1'))
{
m=(float)(p2.y-p1.y)/(p2.x-p1.x);
k=(float)p1.x+(float)(y-p1.y)/m;
temp.x=k;
temp.y=y;
for(i=0;i<4;i++)
temp.code[i]=p1.code[i];
return(temp);
}
else
return(p1);
}

PROGRAM-2::::::::::::::
Program Title:
Write a program to implement Sutherland Hodgeman Polygon Clipping algorithm
Source Code:
#include<iostream>
#include<windows.h>
#include<conio.h>
#include<stdlib.h>
using namespace std;
#define round(a) ((int)(a+0.5))
int k;
float xmin,ymin,xmax,ymax,arr[20],m;
void clipl(float x1,float y1,float x2,float y2)
{
if(x2-x1)
m=(y2-y1)/(x2-x1);
else
m=100000;
if(x1 >= xmin && x2 >= xmin)
{
arr[k]=x2;
arr[k+1]=y2;
k+=2;
}
if(x1 < xmin && x2 >= xmin)
{
arr[k]=xmin;
arr[k+1]=y1+m*(xmin-x1);
arr[k+2]=x2;
arr[k+3]=y2;
k+=4;
}
if(x1 >= xmin && x2 < xmin)
{
arr[k]=xmin;
arr[k+1]=y1+m*(xmin-x1);

k+=2;
}
}
void clipt(float x1,float y1,float x2,float y2)
{
if(y2-y1)
m=(x2-x1)/(y2-y1);
else
m=100000;
if(y1 <= ymax && y2 <= ymax)
{
arr[k]=x2;
arr[k+1]=y2;
k+=2;
}
if(y1 > ymax && y2 <= ymax)
{
arr[k]=x1+m*(ymax-y1);
arr[k+1]=ymax;
arr[k+2]=x2;
arr[k+3]=y2;
k+=4;
}
if(y1 <= ymax && y2 > ymax)
{
arr[k]=x1+m*(ymax-y1);
arr[k+1]=ymax;
k+=2;
}
}
void clipr(float x1,float y1,float x2,float y2)
{
if(x2-x1)
m=(y2-y1)/(x2-x1);
else
m=100000;
if(x1 <= xmax && x2 <= xmax)
{
arr[k]=x2;
arr[k+1]=y2;

k+=2;
}
if(x1 > xmax && x2 <= xmax)
{
arr[k]=xmax;
arr[k+1]=y1+m*(xmax-x1);
arr[k+2]=x2;
arr[k+3]=y2;
k+=4;
}
if(x1 <= xmax && x2 > xmax)
{
arr[k]=xmax;
arr[k+1]=y1+m*(xmax-x1);
k+=2;
}
}
void clipb(float x1,float y1,float x2,float y2)
{
if(y2-y1)
m=(x2-x1)/(y2-y1);
else
m=100000;
if(y1 >= ymin && y2 >= ymin)
{
arr[k]=x2;
arr[k+1]=y2;
k+=2;
}
if(y1 < ymin && y2 >= ymin)
{
arr[k]=x1+m*(ymin-y1);
arr[k+1]=ymin;
arr[k+2]=x2;
arr[k+3]=y2;
k+=4;
}
if(y1 >= ymin && y2 < ymin)
{
arr[k]=x1+m*(ymin-y1);
arr[k+1]=ymin;

k+=2;
}
}
int main()
{
int gdriver=DETECT,gmode,n,poly[20], i;
float xi,yi,xf,yf,polyy[20];
//clrscr();
system("cls");
cout<<"Coordinates of rectangular clip window :nxmin,ymin :";
cin>>xmin>>ymin;
cout<<"xmax,ymax :";
cin>>xmax>>ymax;
cout<<"nnPolygon to be clipped :nNumber of sides :";
cin>>n;
cout<<"Enter the coordinates :";
for(i=0;i < 2*n;i++)
cin>>polyy[i];
polyy[i]=polyy[0];
polyy[i+1]=polyy[1];
for(i=0;i < 2*n+2;i++)
poly[i]=round(polyy[i]);
initgraph(&gdriver,&gmode,"C:TCBGI");
setcolor(RED);
rectangle(xmin,ymax,xmax,ymin);
cout<<"ttUNCLIPPED POLYGON";
setcolor(WHITE);
fillpoly(n,poly);
getch();
cleardevice();
k=0;
for(i=0;i < 2*n;i+=2)
clipl(polyy[i],polyy[i+1],polyy[i+2],polyy[i+3]);
n=k/2;
for(i=0;i < k;i++)
polyy[i]=arr[i];
polyy[i]=polyy[0];
k=0;
for(i=0;i < 2*n;i+=2)
clipt(polyy[i],polyy[i+1],polyy[i+2],polyy[i+3]);

n=k/2;
for(i=0;i < k;i++)
polyy[i]=arr[i];
polyy[i]=polyy[0];
k=0;
for(i=0;i < 2*n;i+=2)
clipr(polyy[i],polyy[i+1],polyy[i+2],polyy[i+3]);
n=k/2;
for(i=0;i < k;i++)
polyy[i]=arr[i];
polyy[i]=polyy[0];
k=0;
for(i=0;i < 2*n;i+=2)
clipb(polyy[i],polyy[i+1],polyy[i+2],polyy[i+3]);
for(i=0;i < k;i++)
poly[i]=round(arr[i]);
if(k)
fillpoly(k/2,poly);
setcolor(RED);
rectangle(xmin,ymax,xmax,ymin);
cout<<"tCLIPPED POLYGON";
getch();
closegraph();
return 0;
}
Input:

Output:
PROGRAM-3::::::::::::::
Program Title:
Write a program to implement Window to Viewport transformation.
Source Code:
#include<stdio.h>
#include<conio.h>
#include<dos.h>
#include<math.h>
int main()
{
int xwmin,ywmin,xwmax,ywmax,xv1,yv1;
int xvmin,xvmax,yvmin,yvmax,xw,yw,xv,yv;
int gd=DETECT,gm;
initgraph(&gd,&gm,"");
printf("Enter the window coordinates xwmin,xwmax,ywmin,ywmaxn");
scanf("%dt%dt%dt%d",&xwmin,&xwmax,&ywmin,&ywmax);
line(xwmin-25,xwmin-25,xwmin-25,ywmax+50);
line(xwmin-40,ywmax+25,xwmax+50,ywmax+25);
outtextxy(xwmin+5,ywmax+5,"Window");
line(xwmin,ywmin,xwmin,ywmax);
line(xwmin,ywmax,xwmax,ywmax);

line(xwmax,ywmax,xwmax,ywmin);
line(xwmax,ywmin,xwmin,ywmin);
xvmax=xwmax/2;
xvmin=xwmin/2;
yvmin=ywmin/2;
yvmax=ywmax/2;
line(xvmin+275,xvmin+275,xvmin+275,yvmax+325);
line(xvmin+255,yvmax+315,xvmax+325,yvmax+315);
outtextxy(xvmin+305,yvmax+305,"Viewport");
line(xvmin+300,yvmin+300,xvmin+300,yvmax+300);
line(xvmin+300,yvmax+300,xvmax+300,yvmax+300);
line(xvmax+300,yvmax+300,xvmax+300,yvmin+300);
line(xvmax+300,yvmin+300,xvmin+300,yvmin+300);
xw=xwmin+50;
yw=ywmin+50;
putpixel(xw,yw,4);
xv1=((xvmax-xvmin)/(xwmax-xwmin))*(xw-xwmin);
xv=xv1+xvmin;
yv1=((yvmax-yvmin)/(ywmax-ywmin))*(yw-ywmin);
yv=yv1+yvmin;
putpixel(xv+325,yv+325,2);
getch();
closegraph();
}
Input:

Output:
PROGRAM-4::::::::::::::
Program Title:
Write a program to implement the following 2D transformations:-
a) Translation
b) Scaling
c) Rotation
Source Code:
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
#include<math.h>
int main()
{
int gm;
int gd=DETECT;
int x1,x2,x3,y1,y2,y3,nx1,nx2,nx3,ny1,ny2,ny3,c;
int sx,sy,xt,yt,r;

float t;
initgraph(&gd,&gm,"c:tcbg:");
printf("t Program for basic transactions");
printf("nt Enter the points of triangle");
setcolor(1);
scanf("%d%d%d%d%d%d",&x1,&y1,&x2,&y2,&x3,&y3);
line(x1,y1,x2,y2);
line(x2,y2,x3,y3);
line(x3,y3,x1,y1);
getch();
printf("n 1.Transactionn 2.Rotationn 3.Scallingn 4.exit");
printf("Enter your choice:");
scanf("%d",&c);
switch(c)
{
case 1:
printf("n Enter the translation factor");
scanf("%d%d",&xt,&yt);
nx1=x1+xt;
ny1=y1+yt;
nx2=x2+xt;
ny2=y2+yt;
nx3=x3+xt;
ny3=y3+yt;
line(nx1,ny1,nx2,ny2);

getch();
case 2:
printf("n Enter the angle of rotation");
scanf("%d",&r);
t=3.14*r/180;
nx1=abs(x1*cos(t)-y1*sin(t));
ny1=abs(x1*sin(t)+y1*cos(t));
getch();
case 3:
printf("n Enter the scalling factor");
scanf("%d%d",&sx,&sy);
nx1=x1*sx;
ny1=y2*sy;
nx2=x2*sx;
ny2=y2*sy;
nx3=x3*sx;
ny3=y3*sy;

getch();
case 4:
break;
default:
printf("Enter the correct choice");
}
closegraph();
}
Input:

Output:
PROGRAM-5::::::::::::::
Program Title:
Write a program to draw a triangle and rotate about the pivot point.
Source Code:
#include<conio.h>
#include<stdio.h>
#include<math.h>
int main()
{
int gd=DETECT,gm;
int i,xmid,ymid,x1,y1,x2,y2,x3,y3,x,y,dy,dx,p,gap=50,temp,xr,yr;
int x1dash,y1dash,x2dash,y2dash,x3dash,y3dash;
float m;
double theta;
char str[5];
//clrscr();
initgraph(&gd,&gm,"..bgi");
printf("Enter first co-ords of the trianglen");

scanf("%d %d",&x1,&y1);
printf("Enter second co-ords of the trianglen");
scanf("%d %d",&x2,&y2);
printf("Enter third co-ords of the trianglen");
scanf("%d %d",&x3,&y3);
xmid= getmaxx()/2;
ymid= getmaxy()/2;
line(5,ymid,getmaxx()-5,ymid);
line(xmid+3,5,xmid+3,getmaxy()-5);
for( i= xmid+gap;i<getmaxx()-5;i=i+gap)
{
outtextxy(i,ymid-3,"|");
//itoa(i-xmid,str,10);
outtextxy(i,ymid+3,str);
}
for( i= ymid-gap;i>5;i=i-gap)
{
outtextxy(xmid,i,"-");
//itoa(ymid-i,str,10);
outtextxy(xmid+5,i,str);
}
for( i= xmid-gap;i>5;i=i-gap)
{
outtextxy(i,ymid-3,"|");
//itoa(-(xmid-i),str,10);
outtextxy(i-6,ymid+3,str);
}
for( i= ymid+gap;i<getmaxy()-5;i=i+gap)
{
outtextxy(xmid,i,"-");
//itoa(-(i-ymid),str,10);
outtextxy(xmid+8,i,str);
}
line(x1+xmid,ymid-y1,x2+xmid,ymid-y2);
printf("Enter the degree to rotaten");

scanf("%lf",&theta);
theta= ((float) theta *3.14f )/(float)180; // converting theta to radian
printf("Enter the arbitrary point to rotaten");
scanf("%d%d",&xr,&yr);
x1dash=xr+(x1-xr)*cos(theta)-(y1-yr)*sin(theta);
y1dash=yr+(x1-xr)*sin(theta)+(y1-yr)*cos(theta);
line(x1dash+xmid,ymid-y1dash,x2dash+xmid,ymid-y2dash);
getch();
closegraph();
}
Input:

Output:
Complete and copy them carefully, thanks you all……!!!

Computer Graphics and Multimedia lab report

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Computer Graphics and Multimedia lab report