# C Program to draw a rectangle and perform the operations.

C Program to draw a rectangle and perform the following operations.
a. Rotation about the origin followed by translation.
b. Rotation about an arbitrary point.
c. Apply X shear and Y shear on the rectangle.

```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 #include <stdio.h> #include <graphics.h> #include <stdlib.h> #include <math.h>   void draw (int r[][2]) { int i; setlinestyle (DOTTED_LINE, 0, 1); line (320, 0, 320, 480); line (0, 240, 640, 240);   setlinestyle (SOLID_LINE, 0, 1); line (320+r[0][0], 240-r[0][1], 320+r[1][0], 240-r[1][1]); line (320+r[0][0], 240-r[0][1], 320+r[3][0], 240-r[3][1]); line (320+r[1][0], 240-r[1][1], 320+r[2][0], 240-r[2][1]); line (320+r[2][0], 240-r[2][1], 320+r[3][0], 240-r[3][1]); }   void reset (int r[][2]) { int i; int val[4][2] = { { 0, 0 },{ 100, 0 },{ 100, 50 },{ 0, 50 } }; for (i=0; i<4; i++) { r[i][0] = val[i][0]; r[i][1] = val[i][1]; } }   void rotate (int r[][2], int angle) { int i; double ang_rad = (angle * M_PI) / 180; for (i=0; i<4; i++) { double xnew, ynew; xnew = r[i][0] * cos (ang_rad) - r[i][1] * sin (ang_rad); ynew = r[i][0] * sin (ang_rad) + r[i][1] * cos (ang_rad); r[i][0] = xnew; r[i][1] = ynew; } }   void shear (int r[][2], int sx, int sy) { int i; for (i=0; i<4; i++) { int xnew, ynew; xnew = r[i][0] + r[i][1] * sx; ynew = r[i][1] + r[i][0] * sy; r[i][0] = xnew; r[i][1] = ynew; } }   void translate (int r[][2], int dx, int dy) { int i; for (i=0; i<4; i++) { r[i][0] += dx; r[i][1] += dy; } }   void ini() { int gd=DETECT,gm; initgraph(&gd,&gm,"..//bgi"); } void main() {   int r[4][2],angle,dx,dy,x, y,choice;   do { clrscr(); printf("1.Rotation about the origin followed by translation\n"); printf("2.Rotation about an arbitrary point\n"); printf("3.Shear about the origin\n"); printf("4.Exit\n\n"); printf("Enter your choice: "); scanf("%d",&choice); switch(choice) { case 1: printf("Enter the rotation angle: "); scanf("%d", &angle); printf("Enter the x- and y-coordinates for translation: "); scanf("%d%d",&dx,&dy); ini(); cleardevice(); reset(r); draw(r);getch(); rotate(r, angle); cleardevice(); draw(r);getch(); translate(r,dx,dy); cleardevice(); draw(r);getch(); closegraph(); break; case 2: printf("Enter the rotation angle: "); scanf("%d",&angle); printf("Enter the x- and y-coordinates of the point: "); scanf("%d%d",&x,&y); ini(); cleardevice(); reset(r); translate(r,x,y); draw(r); putpixel(320+x,240-y,WHITE); getch(); translate(r,-x,-y); draw(r);getch(); rotate(r,angle); draw(r);getch(); translate(r,x,y); cleardevice(); draw(r); putpixel(320+x,240-y,WHITE); getch(); closegraph(); break; case 3: printf("Enter the x- and y-shears: "); scanf("%d%d",&x,&y); ini(); reset(r); draw(r);getch(); shear(r, x, y); cleardevice(); draw (r);getch(); closegraph(); break; case 4: closegraph(); } }while(choice!=4); }```

### One Response to “C Program to draw a rectangle and perform the operations.”

1. SHIVA SINGH

I want to create a database 12 coloumns and rows according to entry with a permanet which can be derived after closing the program