Rotation can be defined as moving an object in a circular path at a given angle theta.
If there is a positive angle, it would rotate in anticlockwise whereas if it appears to a negative angle, the object would rotate in clockwise. Here’s is C program to rotate a line in computer Graphics. The below program is rotation program in C.
Program:
#include<graphics.h> #include<stdio.h> #include<conio.h> #include<math.h> void main() { int gd=DETECT,gm; int pivot_x,pivot_y,x,y; double degree,radian; int rotated_point_x,rotated_point_y; initgraph(&gd,&gm,"C://TURBOC3//BGI"); cleardevice(); printf("\t\t*********** ROTATION *********** \n"); printf("\n Enter an initial coordinates of the line = "); scanf("%d %d",&pivot_x,&pivot_y); printf("\n Enter a final coordinates of the line = "); scanf("%d %d",&x,&y); line(pivot_x,pivot_y,x,y); printf("\n\n Now, Enter a degree = "); scanf("%lf",°ree); radian=degree*0.01745; rotated_point_x=(int)(pivot_x +((x-pivot_x)*cos(radian)-(y-pivot_y)*sin(radian))); rotated_point_y=(int)(pivot_y +((x-pivot_x)*sin(radian)+(y-pivot_y)*cos(radian))); setcolor(RED); line(pivot_x,pivot_y,rotated_point_x,rotated_point_y); getch(); closegraph(); }
Output:
Rotation by 30
Rotation by 90
This post was last modified on August 20, 2022