Program to show rotation,reflection, and shearing in 2D

//Program to show rotation,reflection, and shearing in 2D

#include

#include

#include

#include

void rotate();

void shear();

void reflect();

void main()

{

int ch;

int gd=DETECT,gm;

initgraph(&gd,&gm,"e:\\tc\\bgi");

setcolor(WHITE);

line(100,100,200,100);

line(200,100,200,300);

line(200,300,100,100);

printf("---MENU---");

printf("\n 1)Rotate\n 2)Reflect\n 3)Shear");

printf("\nEnter your choice: ");

scanf("%d",&ch);

cleardevice();

switch(ch)

{

case 1: rotate();

break;

case 2: reflect();

break;

case 3: shear();

break;

default: printf("you have enterd wrong choice");

break;

}

getch();

closegraph();

}

void rotate()

{

float theta;

int x1,x2,x3;

int y1,y2,y3;

int ax1,ax2,ax3,ay1,ay2,ay3;

int refx,refy;

printf("\nEnter the angle for rotation: ");

scanf("%f",&theta);

cleardevice();

setcolor(WHITE);

outtextxy(240,10,"ROTATE");

outtextxy(238,20,"-------");

refx=100;

refy=100;

printf("Theta=%d",(int)theta);

theta=theta*(3.14/180);

x1=100;

y1=100;

x2=200;

y2=100;

x3=200;

y3=300;

ax1=refx+(x1-refx)*cos(theta)-(y1-refy)*sin(theta);

ay1=refy+(x1-refx)*sin(theta)+(y1-refy)*cos(theta);

ax2=refx+(x2-refx)*cos(theta)-(y2-refy)*sin(theta);

ay2=refy+(x2-refx)*sin(theta)+(y2-refy)*cos(theta);

ax3=refx+(x3-refx)*cos(theta)-(y3-refy)*sin(theta);

ay3=refy+(x3-refx)*sin(theta)+(y3-refy)*cos(theta);

setcolor(BROWN);

line(100,100,200,100);

line(200,100,200,300);

line(200,300,100,100);

setcolor(WHITE);

line(ax1,ay1,ax2,ay2);

line(ax2,ay2,ax3,ay3);

line(ax3,ay3,ax1,ay1);

}

void shear()

{

float shx;

int x1,x2,x3;

int y1,y2,y3;

int ax1,ax2,ax3,ay1,ay2,ay3;

int refy;

printf("\nEnter the shear parameter : ");

scanf("%f",&shx);

cleardevice();

setcolor(WHITE);

outtextxy(240,10,"SHEAR");

outtextxy(238,20,"-------");

refy=100;

printf("shx=%f\nyref=%d",shx,refy);

x1=100;

y1=100;

x2=200;

y2=100;

x3=200;

y3=300;

ax1=x1+shx*(y1-refy);

ay1=y1;

ax2=x2+shx*(y2-refy);

ay2=y2;

ax3=x3+shx*(y3-refy);

ay3=y3;

setcolor(BROWN);

line(100,100,200,100);

line(200,100,200,300);

line(200,300,100,100);

setcolor(WHITE);

line(ax1,ay1,ax2,ay2);

line(ax2,ay2,ax3,ay3);

line(ax3,ay3,ax1,ay1);

}

void reflect()

{

int x1,x2,x3;

int y1,y2,y3;

int ax1,ax2,ax3,ay1,ay2,ay3;

int refx;

cleardevice();

setcolor(WHITE);

outtextxy(240,10,"REFLECT(about x=320)");

outtextxy(238,20,"---------------------");

refx=320;

x1=100;

y1=100;

x2=200;

y2=100;

x3=200;

y3=300;

ax1=640-x1;

ay1=y1;

ax2=640-x2;

ay2=y2;

ax3=640-x3;

ay3=y3;

setcolor(BROWN);

line(x1,y1,x2,y2);

line(x2,y2,x3,y3);

line(x3,y3,x1,y1);

setcolor(WHITE);

line(320,50,320,400);

line(ax1,ay1,ax2,ay2);

line(ax2,ay2,ax3,ay3);

line(ax3,ay3,ax1,ay1);

}