Rotation of a Line C++ Code

Learn here Rotation of a Line C++ Code.

#include<stdio.h>

#include<graphics.h>

#include<math.h>

#define PI acos(-1)

int main()

{

int gd=0,gm,x1,y1,x2,y2;

double s,c, angle;

initgraph(&gd, &gm, "");

printf("Enter coordinates of line: ");

scanf("%d%d%d%d",&x1,&y1,&x2,&y2);

cleardevice();

line(x1,y1,x2,y2);

//getch();

printf("Enter rotation angle: ");

scanf("%lf", &angle);

c = cos(angle * PI /180);

s = sin(angle * PI /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);

printf("%d %d %d %d", x1, y1, x2, y2);

cleardevice();

line(x1, y1,x2, y2);

getch();

closegraph();

return 0;

}

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