Rotate_Object_in_2D.cpp

// Write a Program to Rotate an Object in 2D plane.
#include<stdio.h>  
#include<graphics.h>  
#include<math.h>  
int main()  
{  
    int gd=0,gm,x1,y1,x2,y2;  
    double s,c, angle;  
    initgraph(&gd, &gm, "C:\\TC\\BGI");  
    setcolor(RED);  
    printf("Enter coordinates of line: ");  
    scanf("%d%d%d%d",&x1,&y1,&x2,&y2);  
    cleardevice();  
    setbkcolor(RED);  
    line(x1,y1,x2,y2);  
    getch();  
    setbkcolor(BLACK);  
    printf("Enter rotation angle: ");  
    scanf("%lf", &angle);  
    setbkcolor(BLACK);  
    c = cos(angle *3.14/180);  
    s = sin(angle *3.14/180);  
    x1 = floor(x1 * c + y1 * s);  
    y1 = floor(-x1 * s + y1 * c);  
    x2 = floor(x2 * c + y2 * s);  
    y2 = floor(-x2 * s + y2 * c);  
    cleardevice();  
    line(x1, y1 ,x2, y2);  
    int temp;
    scanf("%d", temp);
    getch();  
    closegraph();  
return 0;  
}