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Really simple stuff..

Started by Laroche Feb 21, 2003 at 5:38 PM 1 replies 300+ views

Original Post

Feb 21, 2003 at 5:38 PM

If a given object is facing angle R, and the user advances forward, what would be the new X,Y coordinates of the object? Somehow in my head I realize this is easy, but I just can''t seem to figure it out for some reason..

Laroche

Feb 21, 2003 at 8:38 PM

ok, figured it out on my own

heres my solution, if anyone was curious for some reason:



Position.x += sin(Direction) * Velocity;
Position.y += cos(Direction - PI) * Velocity;

rypyr

Feb 24, 2003 at 4:51 PM

You have to clarify two things in your question:

1) from what axis the angle R is made
2) whether you have a left-hand coordinate system or a right-hand coord system

For a right-hand coordinate system (+x axis goes to the right and +y axis goes up), with the angle being measured from the x-axis, the equations are:

Pos.x += cos(R) * Velocity
Pox.y += sin(R) * Velocity

If your equations work, then I guess your angle is made w.r.t the y axis and you have a left-hand coordinate system (since cos(R+PI) = -cos(R)

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