Perform 2D Transformations in Rotation

Write a C Program to perform 2D Transformations in Rotation. Here’s simple Program to perform 2D Transformations in Rotation in C Programming Language.

Below is the source code for C Program to perform 2D Transformations in Rotation which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

/*  C Program to perform 2D Transformations in Rotation  */

#include<graphics.h>
#include<stdio.h>
#include<conio.h>
#include<math.h>
void rotate( int figure[], int edges, double angle, int cx, int cy ) {
        double x, y;
        angle = -1 * (angle*3.14/180);
        double cos_a = cos(angle);
        double sin_a = sin(angle);
        for (int i=0; i < edges; i++) {
                x = figure[2*i] - cx;
                y = figure[2*i+1] - cy;
                figure[2*i] = ceil( (x * cos_a) - (y * sin_a) + cx );
                figure[2*i+1] = ceil( (x * sin_a)+(y * cos_a) + cy );
        }
}
void main() {
        int figure[20], edges;
        // A Figure with Max 10 edges.
        double angle;
        int cx=0, cy=0;
        int gd = DETECT, gm;
        initgraph( &gd, &gm, "" );
        int max_y = getmaxy();
        clrscr();
        cleardevice();
        printf( "Number of edges: " );
        scanf( "%d", &edges );
        for (int i=0; i < edges; i++) {
                printf( "Enter edge (x%d,y%d) : ", i , i );
                scanf( "%d %d", &figure[2*i], &figure[2*i+1] );
        }
        figure[2*i] = figure[0];
        figure[2*i+1] = figure[1];
        edges += 1;
        printf( "Enter angle of rotation in degrees: ");
        scanf( "%lf", &angle);
        printf( "Enter the center of rotation: \n");
        printf( "cx: ");
        scanf( "%d", &cx);
        printf( "cy: ");
        scanf( "%d", &cy);
        cy = max_y - cy;
        cleardevice();
        setbkcolor(WHITE);
        setcolor(GREEN);
        setlinestyle(SOLID_LINE, 0, 3);
        drawpoly( edges, figure );
        getch();
        for (int i=0; i < edges; i++)
                        figure[2*i+1] = max_y - figure[2*i+1];
        rotate(figure,edges,angle,cx,cy);
        for (int i=0; i < edges; i++)
                        figure[2*i+1] = max_y - figure[2*i+1];
        setcolor(RED);
        drawpoly( edges, figure );
        getch();
}

Above is the source code for C Program to perform 2D Transformations in Rotation which is successfully compiled and run on Windows System.The Output of the program is shown above .

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