Rotation of line in c Or c++

@sumit-goel-GHakPk • Oct 25, 2024

Oct 25, 2024

1.7K

hello friends,
I have another problem that is how to rotate the line at 90 degree from the origin.
for example, i have a line x,y

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x.......................... y
and now i want to rotate this line at 90 degree as shown bellow

90
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X

rotation at 90 degree

Pls help me in solving this problem

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gaurav.bhorkar

@gauravbhorkar-Pf9kZD • Aug 17, 2010

Can you post the code you've tried so far?

Here's my suggestion,
Fix one end of the line and then change the coordinates of the other end appropriately.
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optimystix

@optimystix-4yMPKC • Aug 17, 2010

what is the problem ? just substitute the corresponding values for 90 degree in the rotational transformation matrix and solve it.
where are u facing the problem ? share with us so that we can help.
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Manish Goyal

@manish-r2Hoep • Aug 17, 2010

Try bresenham algorithm
change the coordinates of line accordingly
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sumit_goel

@sumit-goel-GHakPk • Aug 18, 2010

Hello friends
first of all i would like to thanks to all for giving response to my problem. Actually i made a table fan in c++ and i want to rotate the fan. but for this first of all i should know how to rotate the line. then i can proceed to make rotation of fan.In the above problem i simply want to ask how to rotate the line at 90 degree.I am beginner of graphics programs in c++. and also Can anyone tell me from which site i can learn simple graphics programs in c++.
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Manish Goyal

@manish-r2Hoep • Aug 18, 2010

Try this program but i have not execute this .
It will draw a line
Now for rotating it change its co-ordinates accordingly

#include  <graphics.h>
#include  <math.h>
#include <conio.h>

void main(void)
{
    int   driver = DETECT,mode;
    
    int   x=180,y=180;

    initgraph(&driver,&mode,"c:\\tc\\bgi");
    
    for(;;)
{
    
      line(360,360,x,y);
        
        
}
    getch();          
    closegraph();
}