Page 165 - DCAP313_LAB_ON_COMPUTER_GRAPHICS

Unit 10: Shearing

Rotations around the x, y and z axes are called principal rotations. Rotation around any axis Notes
can be performed by taking a rotation around the x axis, followed by a rotation around the y
axis, and followed by a rotation around the z axis. That is to say, any spatial rotation can be
decomposed into a combination of principal rotations.
2D Rotation Program Using C Programming
#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<process.h>
#include<math.h>
void Triangle(int x1,int y1,int x2,int y2,int x3,int y3);
void Rotate(int x1,int y1,int x2,int y2,int x3,int y3);
void main ()
{
int gd=DETECT,gm;
int x1,y1,x2,y2,x3,y3;
initgraph(&gd,&gm, “”);
printf(“Enter the 1st point for the triangle:”);
scanf(“%d%d”,&x1,&y1);
printf(“Enter the 2nd point for the triangle:”);
scanf(“%d%d”,&x2,&y2);
printf(“Enter the 3rd point for the triangle:”);
scanf(“%d%d”,&x3,&y3);
TriAngle(x1,y1,x2,y2,x3,y3);
getch();
cleardevice();
Rotate(x1,y1,x2,y2,x3,y3);
setcolor(1);
TriAngle(x1,y1,x2,y2,x3,y3);
getch();
}
void TriAngle(int x1,int y1,int x2,int y2,int x3,int y3)
{
line(x1,y1,x2,y2);
line(x2,y2,x3,y3);
line(x3,y3,x1,y1);
}
void Rotate(int x1,int y1,int x2,int y2,int x3,int y3)
{
int x,y,a1,b1,a2,b2,a3,b3,p=x2,q=y2;
float Angle;
printf(“Enter the angle for rotation:”);

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