stupid thing I cant work out

[FireSlash518]

I must be totally retarded...


I have two points, X1, Y1, the starting coords, and X2, Y2, the end coords. If i want to move the position of an object from start to end at a fixed speed (S), how would I do this?

Im thinking maybe I need to go back and take geometry again

[Zaei]

Init:
dist = sqrt((end_x - start_x)^2 + (end_y - start_y)^2)
time = (dist / speed)
start_time = CurrentTime
UpdateIteration:
progress_time = CurrentTime() - start_time
lerp_progress = (progress_time / time) * GlobalSpeed
if abs(1.0-lerp_progress) < 0.05 stop
current_x = start_x + (lerp_progress * (end_x - start_x))
current_y = start_y + (lerp_progress * (end_y - start_y))

Essentially, find the time it will take to arrive at the destination, given the speed, and start and end coordinates. Then, at each iteration, find how much time has passed since you started moving, and the percent of the move that is complete. Then simply compute the current position through linear interpolation.

Z.

[dafhi]

I second that, however you don't even need the distance formula!

[Zaei]

No, but then you cannot use the interpolation method. You could construct a vector for direction, and move along that vector, until you are close to the end point, but in that case you still have to evaluate the distance, except you do it once per iteration.

Z.