How would you move an object in straight line pixel by pixel from location to another

[Tsun]

I have an object, and I want to move it from one point to another. I want to move it one pixel at a time in a fast loop, and so that it goes in a straight line from point A to point B. I want to add an action every time it moves a pixel, so that's why pixel by pixel.

I suppose this requires some kind of mathematical calculation, but I can't figure it out. I tried calculating some kind of ratio, as in for example "move it in X axis every 0.25 times and move in Y the rest", but it becomes difficult since the point B might be either in negative or positive X or Y axis.

Any ideas?

[nivram]

You know how a player pushes a box? Can you somehow translate that?

Just a thought,
Marv

[DistantJ]

Well if you're doing a horizontal or vertical line it's straight up add/subtract 1 to X/Y but I'm sure you already know that. What you need is to move it diagonally, right?

Look up Sine and Cosine, there's a trigonometry tutorial floating around, might be on Marv's site.

[Tsun]

Is it possible to use sine/cosine to move it that way?

I want to add an action every time it moves one pixel, for example launch a bullet. Easy enough until you need to move in diagonal angles different from 45° divisions.

[Tsun]

After a lot of guessing and experimenting, I managed to do it, and there is yet another app that even the developer would have trouble replicating. :P

[DistantJ]

You basically use trig to work out how much to move horizontally and vertically, so you treat it like you're finding out the sides of a triangle when you know the hypotenuse length.