Anyone know Trig?

[Elric_Soban]

I have an X,Y Coordinate, an angle, and a distance.
If i start at point X, Y, travel along the angle for the given distance, I should be able to calculate the resulting new X,Y.

ive been scouring the net for the formula, with no luck. so far i have

X2 = X + (distance * Cos(angle))
Y2 = Y + (distance * Sin(angle))

but it doesn't appear to be working.
Any help? Thanks!

Ok I have determined that infact:


X2 = cos(angle) * distance
Y2 = sin(angle) * distance

What if i have a starting point other than 0,0? How does that new co-ord fit in?

 

[Loren]

I have an X,Y Coordinate, an angle, and a distance.
If i start at point X, Y, travel along the angle for the given distance, I should be able to calculate the resulting new X,Y.

ive been scouring the net for the formula, with no luck. so far i have

X2 = X + (distance * Cos(angle))
Y2 = Y + (distance * Sin(angle))

but it doesn't appear to be working.
Any help? Thanks!

Ok I have determined that infact:


X2 = cos(angle) * distance
Y2 = sin(angle) * distance

What if i have a starting point other than 0,0? How does that new co-ord fit in?

Assuming (carefull with that),
We are talking about angle with respect to the positive X-axis, then this will be eazy peazy lemon squeezy.

What the angle is referenced from is much more important than the starting point, imho.

You will not need a formula per se, just recall the relationship between x,y,r, and theta.
change in X = r*cos(theta), change in y = r*sin(theta)
r = distance traveled.

So, plug in your distance as r, and solve. Add or subtract as appropriate with the coordinate pair that is your origin.

 

[Taylor]

I can almost balance a checkbook.