With this function you can find the value that equates to the position between two other values for a given percentage. So if you do, for example:
lerp(0, 10, 0.5)
you would get the return value of 5, which is 50% of the input values. You can extrapolate using this function too, by supplying a positive or negative value for the interpolation amount so that doing something like:
lerp(0, 10, 2)
will return a value of 20.
lerp(a, b, amt)
|a||The first value.|
|b||The second value.|
|amt||The amount to interpolate.|
xx = lerp(x, x + hspeed, room_speed);
yy = lerp(y, y + vspeed, room_speed);
The above code uses the linear interpolation function to predict where an instance would have moved to after one second of game time.