Practical File of Computer Graphics

PRACTICAL FILE OF COMPUTER GRAPHICS

SUBMITTED TO

SUBMITTED BY

Mr. Sanjay Kataria Asst. Professor CSE Deptt.

Pankaj Gill 11/CSE/168 CSE-B


INDEX Aim

Page

1.

Write a program to draw a stick man

2

2.

Write a program to draw a rectangle using line function Write a program to draw a line using DDA’s line drawing algorithm Write a program to draw a line using Bresenham’s line drawing algorithm Write a program to draw a circle using equation of circle Write a program to draw a circle using Bresenham’s circle drawing algorithm Write a program to draw a circle using midpoint circle drawing algorithm Write a program to draw a circle using polar coordinates Write a program to fill a circle using Boundary Fill Algorithm Write a program to fill a circle using Flood Fill Algorithm Write a program for line clipping using cohenSutherland algorithm Write a program to translate a triangle about the origin Write a program to scale a triangle about a fixed point taken as one of the vertex of the triangle Write a program to rotate a triangle about a fixed point taken as one of the vertex of the triangle

4

3. 4. 5. 6 7. 8. 9. 10. 11. 12. 13.

14.

PANKAJ GILL

Remarks

6 9 12 14 17 20 23 27 30 36 39

42

1 11/CSE/168


PRACTICAL NO.1 Write a program to draw a stick man #include #include #include void main() { intgd=DETECT,gm; int x,y,r,c1; initgraph(&gd,&gm,""); circle(150,70,70); circle(120,50,10); circle(190,50,10); line(155,60,155,80); arc(155,100,180,360,20); line(130,140,130,170); line(170,140,170,170); rectangle(80,170,230,260); line(110,260,110,360); line(205,260,205,360); line(80,190,55,240); line(230,190,255,240); getch(); }

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OUTPUT

PANKAJ GILL

3 11/CSE/168


PRACTICAL NO. 2 Write a program to draw a rectangle using line function #include void main() { intgd=DETECT,gm; initgraph(&gd,&gm," "); line(100,100,100,300); line(100,100,300,100); line(100,300,300,300); line(300,100,300,300); getch(); }

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OUTPUT

PANKAJ GILL

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PRACTICAL NO. 3

Write a program to draw a line using DDA’s line drawing algorithm #include #include #include #include voidlineDDA(int,int,int,int); void main() { int x1,y1,xn,yn; intgd=DETECT,gm; initgraph(&gd,&gm,""); printf("enter the starting coordinates of the line:"); scanf("%d%d",&x1,&y1); printf("enter the ending coordinates of the line:"); scanf("%d%d",&xn,&yn); lineDDA(x1,y1,xn,yn); getch(); } voidlineDDA(int x1,int y1,int xn,intyn) { intdx,dy,m,i; m=(yn-y1)/(xn-x1); for(i=x1;i<=xn;i++)

PANKAJ GILL

6 11/CSE/168

PRACTICAL FILE OF COMPUTER GRAPHICS { if(m<=1) { dx=1; dy=(m*dx); } else { dy=1; dx=(dy/m); } x1=x1+dx; y1=y1+dy; { putpixel(x1,y1,RED); delay(20); } } }

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OUTPUT

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PROGRAM NO.4

Write a program to draw a line using Bresenham’s line drawing algorithm #include #include #include #include voidlineBres(int,int,int,int); void main() { int x1,y1,xn,yn; intgd=DETECT,gm; initgraph(&gd,&gm,""); printf("Enter the starting coordinate at line:"); scanf("%d%d", &x1, &y1); printf("Enter the ending coordinate at line:"); scanf("%d%d", &xn, &yn); lineBres(x1,y1,xn,yn); getch(); } voidlineBres(int x1,int y1,int xn,intyn) { int dx = xn-x1,dy=yn-y1; int di = 2*dy-dx; int ds = 2*dy,dt = 2*(dy-dx);

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PRACTICAL FILE OF COMPUTER GRAPHICS putpixel(x1,y1,RED); while(x1
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OUTPUT

PANKAJ GILL

11 11/CSE/168


PRACTICAL NO. 5 Write a program to draw a circle using equation of circle #include #include void main() { intgd=DETECT,gm; int x,y,r,c1; initgraph(&gd,&gm,""); circle(200,200,50); getch(); closegraph(); }

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OUTPUT

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PRACTICAL NO. 6

Write a program to draw a circle using Bresenham’s circle drawing algorithm #include #include #include #include voidcircleBres(int,int,int); voiddrawcircle(int,int,int,int); void main() { intxc,yc,r; intgd=DETECT,gm; initgraph(&gd,&gm,""); printf("Enter the centre coordinates of the circle"); scanf("%d%d",&xc,&yc); printf("Enter radius of circle:"); scanf("%d",&r); circleBres(xc,yc,r); getch(); } voidcircleBres(intxc,intyc,int r) { int x=0,y=r; int d=3-2*r;

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PRACTICAL FILE OF COMPUTER GRAPHICS while(x
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OUTPUT

PANKAJ GILL

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PRACTICAL NO. 7

Write a program to draw a circle using midpoint circle drawing algorithm #include #include #include #include voidcirclemidpoint(int,int,int); voiddrawcircle(int,int,int,int); void main() { intxc,yc,r; intgd=DETECT,gm; initgraph(&gd,&gm,""); printf("Enter center coordinates of the circle: "); scanf("%d%d",&xc,&yc); printf("Enter radius of the circle: "); scanf("%d",&r); circlemidpoint(xc,yc,r); getch(); } voidcirclemidpoint(intxc,intyc,int r) { int x=0,y=r; int p=1-r; while(x
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PRACTICAL FILE OF COMPUTER GRAPHICS p=p+2*x+1; } else { y--; p=p+2*(x-y)+1; } drawcircle(xc,yc,x,y); delay(50); } } voiddrawcircle(intxc,intyc,intx,int y) { putpixel(xc+x,yc+y,RED); putpixel(xc-x,yc+y,BLUE); putpixel(xc+x,yc-y,GREEN); putpixel(xc-x,yc-y,RED); putpixel(xc+y,yc+xGREEN); putpixel(xc-y,yc+x,YELLOW); putpixel(xc+y,yc-x, YELLOW); putpixel(xc-y,yc-x, YELLOW); }

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OUTPUT

PANKAJ GILL

19 11/CSE/168


PRACTICAL NO. 8

Write a program to draw a circle using polar coordinates #include #include #include voidacircle(inth,intk,int r); voiddpixel(intx,inty,inth,int k); void main() { intgd=DETECT,gm; initgraph(&gd,&gm,""); setbkcolor(YELLOW); acircle(100,100,100); getch(); closegraph(); } voidacircle(inth,intk,int r) { inty,x; int theta; for(theta=0;theta<=360;theta+=1) {

x=r*cos(theta); y=r*sin(theta); dpixel(x,y,h,k);

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PRACTICAL FILE OF COMPUTER GRAPHICS } } voiddpixel(intx,inty,inth,int k) { putpixel(x+h,y+k,RED); putpixel(y+h,x+k,RED); putpixel(-y+h,x+k,RED); putpixel(-x+h,y+k,RED); putpixel(-x+h,-y+k,RED); putpixel(-y+h,-x+k,RED); putpixel(y+h,-x+k,RED); putpixel(x+h,-y+k,RED); }

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OUTPUT

PANKAJ GILL

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PRACTICAL NO. 9

Write a program to fill a circle using Boundary Fill Algorithm #include #include #include voiddcircle(inth,intk,int r); voiddpixel(intx,inty,inth,int k); voidcfill(intx,int y, intfcolor, intbcolor); void main() { intgd=DETECT,gm; initgraph(&gd,&gm,""); setbkcolor(YELLOW); dcircle(30,30,27); cfill(30,30,BLUE,RED); getch(); closegraph(); } voiddcircle(inth,intk,int r) { inty,i;

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PRACTICAL FILE OF COMPUTER GRAPHICS for(i=0;i<=r;i++) { y=sqrt((r*r-(i)*(i))); dpixel(i,y,h,k); } } voiddpixel(intx,inty,inth,int k) { putpixel(x+h,y+k,RED); putpixel(y+h,x+k,RED); putpixel(-y+h,x+k,RED); putpixel(-x+h,y+k,RED); putpixel(-x+h,-y+k,RED); putpixel(-y+h,-x+k,RED); putpixel(y+h,-x+k,RED); putpixel(x+h,-y+k,RED); } voidcfill(intx,int y, intfcolor, intbcolor) { int current; current=getpixel(x,y); if(current!=bcolor&& current!=fcolor)

PANKAJ GILL

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PRACTICAL FILE OF COMPUTER GRAPHICS { putpixel(x,y,fcolor); cfill(x+1,y,BLUE,RED); cfill(x-1,y,BLUE,RED); cfill(x,y+1,BLUE,RED); cfill(x,y-1,BLUE,RED); } }

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OUTPUT

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PRACTICAL NO. 10 Write a program to fill a circle using Flood Fill Algorithm #include #include #include voiddcircle(inth,intk,int r); voiddpixel(intx,inty,inth,int k); voidffill(intx,int y, intfcolor, intbcolor); void main() { intgd=DETECT,gm; initgraph(&gd,&gm,""); setbkcolor(YELLOW); dcircle(30,30,27); ffill(30,30,YELLOW,BLACK); getch(); closegraph(); } voiddcircle(inth,intk,int r) { inty,i; for(i=0;i<=r;i++) { y=sqrt((r*r-(i)*(i))); dpixel(i,y,h,k); } }

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PRACTICAL FILE OF COMPUTER GRAPHICS voiddpixel(intx,inty,inth,int k) { putpixel(x+h,y+k,RED); putpixel(y+h,x+k,RED); putpixel(-y+h,x+k,RED); putpixel(-x+h,y+k,RED); putpixel(-x+h,-y+k,RED); putpixel(-y+h,-x+k,RED); putpixel(y+h,-x+k,RED); putpixel(x+h,-y+k,RED); } voidffill(intx,int y, intfcolor, intbcolor) { if(getpixel(x,y)==bcolor) { putpixel(x,y,fcolor); ffill(x+1,y,YELLOW,BLACK); ffill(x-1,y,YELLOW,BLACK); ffill(x,y+1,YELLOW,BLACK); ffill(x,y-1,YELLOW,BLACK); } }

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OUTPUT

PANKAJ GILL

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PROGRAM NO. 11

Write a program for line clipping using cohen Sutherland algorithm #include #include #include typedef unsigned intoutcode; enum { TOP=0x1, BOTTOM=0x2, RIGHT=0x4, LEFT=0x8 }; voidlineclip(x0,y0,x1,y1,xwmin,ywmin,xwmax,ywmax ) float x0,y0,x1,y1,xwmin,ywmin,xwmax,ywmax; { intgd,gm; outcode code0,code1,codeout; int accept = 0, done=0; code0 = calcode(x0,y0,xwmin,ywmin,xwmax,ywmax); code1 = calcode(x1,y1,xwmin,ywmin,xwmax,ywmax); do{ if(!(code0 | code1)) { accept =1 ; done =1; } else if(code0 & code1) done = 1; else

PANKAJ GILL

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PRACTICAL FILE OF COMPUTER GRAPHICS { floatx,y; codeout = code0 ? code0 : code1; if(codeout& TOP) { x = x0 + (x1-x0)*(ywmax-y0)/(y1-y0); y = ywmax; } else if(codeout& BOTTOM) { x = x0 + (x1-x0)*(ywmin-y0)/(y1-y0); y = ywmin; } else if ( codeout& RIGHT) { y = y0+(y1-y0)*(xwmax-x0)/(x1-x0); x = xwmax; } else { y = y0 + (y1-y0)*(xwmin-x0)/(x1-x0); x = xwmin; } if(codeout == code0)

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PRACTICAL FILE OF COMPUTER GRAPHICS { x0 = x; y0 = y; code0=calcode(x0,y0,xwmin,ywmin,xwmax,ywma x); } else { x1 = x; y1 = y; code1 = calcode(x1,y1,xwmin,ywmin,xwmax,ywmax); } } } while( done == 0); if(accept) line(x0,y0,x1,y1); rectangle(xwmin,ywmin,xwmax,ywmax); getch(); } intcalcode (x,y,xwmin,ywmin,xwmax,ywmax) floatx,y,xwmin,ywmin,xwmax,ywmax; { int code =0; if(y>ywmax) code |=TOP; else if( y
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PRACTICAL FILE OF COMPUTER GRAPHICS else if(x >xwmax) code |= RIGHT; else if ( x
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PRACTICAL FILE OF COMPUTER GRAPHICS clrscr(); lineclip(x1,y1,x2,y2,xwmin,ywmin,xwmax,ywmax ); getch(); closegraph(); }

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OUTPUT

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PRACTICAL NO. 12 Write a program to translate a triangle about the origin #include #include #include #include #include voidRectAngle(intx,inty,intHeight,int Width); void Translate(intx,inty,intHeight,int Width); void main() { intgd=DETECT,gm; intx,y,Height,Width; initgraph(&gd,&gm," "); printf("Enter the First point for the Rectangle:"); scanf("%d%d",&x,&y); printf("Enter the Height&Width for the Rectangle:"); scanf("%d%d",&Height,&Width); RectAngle(x,y,Height,Width); getch(); cleardevice(); Translate(x,y,Height,Width); RectAngle(x,y,Height,Width); getch();

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PRACTICAL FILE OF COMPUTER GRAPHICS } voidRectAngle(intx,inty,intHeight,int Width) { line(x,y,x+Width,y); line(x,y,x,y+Height); line(x+Width,y,x+Width,y+Height); line(x,y+Height,x+Width,y+Height); } void Translate(intx,inty,intHeight,int Width) { intNewx,Newy,a,b; printf("Enter the Transaction coordinates"); scanf("%d%d",&Newx,&Newy); cleardevice(); a=x+Newx; b=y+Newy; RectAngle(a,b,Height,Width); }

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OUTPUT

PANKAJ GILL

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PRACTICAL NO. 13

Write a program to scale a triangle about a fixed point taken as one of the vertex of the triangle #include #include #include void main() { int x1,y1,x2,y2,x3,y3,x4,y4; intsx,sy; int poly[8]; intgd=DETECT,gm; initgraph(&gd,&gm,""); cleardevice(); printf("Enter the first coordinates of triangle: "); scanf("%d%d",&x1,&y1); printf("Enter the second coordinates of triangle: "); scanf("%d%d",&x2,&y2); printf("Enter the third coordinates of triangle: "); scanf("%d%d",&x3,&y3); poly[0]=x1; poly[1]=y1; poly[2]=x2; poly[3]=y2; poly[4]=x3; poly[5]=y3; poly[6]=x1; poly[7]=y1; cleardevice(); drawpoly(4,poly); getch(); printf("Enter the scaling factors: ");

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PRACTICAL FILE OF COMPUTER GRAPHICS scanf("%d%d",&sx,&sy); x4=sx*x1-x1; y4=sy*y1-y1; x1=sx*x1-x4; y1=sy*y1-y4; x2=sx*x2-x4; y2=sy*y2-y4; x3=sx*x3-x4; y3=sy*y3-y4; poly[0]=x1; poly[1]=y1; poly[2]=x2; poly[3]=y2; poly[4]=x3; poly[5]=y3; poly[6]=x1; poly[7]=y1; getch(); cleardevice(); drawpoly(4,poly);2 getch(); closegraph(); }

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OUTPUT

After Scaling

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Program No. 14

Write a program to rotate a triangle about a fixed point taken as one of the vertex of the triangle #include #include #include #include #include void TriAngle(int x1,int y1,int x2,int y2,int x3,int y3); void Rotate(int x1,int y1,int x2,int y2,int x3,int y3); void main() { intgd=DETECT,gm; int x1,y1,x2,y2,x3,y3; initgraph(&gd,&gm," "); printf("Enter the 1st point for the triangle: "); scanf("%d%d",&x1,&y1); printf("Enter the 2nd point for the triangle: "); scanf("%d%d",&x2,&y2); printf("Enter the 3rd point for the triangle: "); scanf("%d%d",&x3,&y3); TriAngle(x1,y1,x2,y2,x3,y3); getch(); cleardevice(); Rotate(x1,y1,x2,y2,x3,y3); setcolor(5); TriAngle(x1,y1,x2,y2,x3,y3); getch(); } voidTriAngle(int x1,int y1,int x2,int y2,int x3,int y3) {

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PRACTICAL FILE OF COMPUTER GRAPHICS line(x1,y1,x2,y2); line(x2,y2,x3,y3); line(x3,y3,x1,y1); } void Rotate(int x1,int y1,int x2,int y2,int x3,int y3) { int x,y,a1,b1,a2,b2,a3,b3; float Angle; printf("Enter the angle for rotation: "); scanf("%f",&Angle); cleardevice(); Angle=(Angle*3.14)/180; a1=x2+(x1-x2)*cos(Angle)-(y1-y2)*sin(Angle); b1=y2+(x1-x2)*sin(Angle)+(y1-y2)*cos(Angle); a2=x2+(x2-x2)*cos(Angle)-(y2-y2)*sin(Angle); b2=y2+(x2-x2)*sin(Angle)+(y2-y2)*cos(Angle); a3=x2+(x3-x2)*cos(Angle)-(y3-y2)*sin(Angle); b3=y2+(x3-x2)*sin(Angle)+(y3-y2)*cos(Angle); printf("Rotated: "); TriAngle(a1,b1,a2,b2,a3,b3); }

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OUTPUT

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Practical File of Computer Graphics

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