I have a code that moves an entity along a pre defined path. It works fine but could be better. Essentially, I need the entity to move along a path that is calculated from the entity's starting x and y positions to its ending x,y positions. The entity should gradually increase/decrease its x/y movement based on this result. I tried to use some basic algebra to get this result but , it wont work. I would like for the formula/code to calculate the length of the hypotenuse using a percentage scale so I only need to adjust a speed skill/variable during runtime. Any ideas???

Okaaaayyyy, maybe it would be a bit better if I drew a picture...



As you can see, I have two positions which will be stored in vectors. During runtime, I need the entity to move smoothly to the defined vector position. In this case, I use a right triangle as the example. The hypotenuse is colored red to show the line I would like the entity to move on. I assume the same effect could be created using a point&click style movement so I'll do some research.

why not use vec_diff?

as painkiller said, you can use vec diff, to calculate the direction of the movement
then you normalize that direction to the speed you want the entity to move.
the following frames, you add the resulting vector to the position of your entity

like this:

vec_diff(vec_result,vec_start,vec_end);
vec_normalize(vec_result,speed);
while(vec_dist(my,x,vec_end) > speed)
{
vec_add(my.s,resultvec);
wait(1);
}

it isn't tested, and also it doesn't work with the time_step variable.
I hope this helps!

You see, this is why the manual needs a better search engine. I never even knew about that function Thanks for the help guys, I'll look into how this is used and attempt to properly place this function in my code (not Roel's example, just the vec_diff command in general).