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 Slope Help!  (Read 1209 times) 0 Members and 1 Guest are viewing this topic.
Shin_Bet

Senior Newbie

 « Posted 2006-01-19 00:46:39 »

Hi, im making a game and i need some help in calculating some slope stuff.

i basically have two points, and i want to draw a ball travelling between the two. I used Y = mX + b...But when the X points start becoming similar this method goes to pot. It also has differnet speeds depending on where you shoot. Any help is appreciated, thanks.
noblemaster

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 « Reply #1 - Posted 2006-01-19 01:26:56 »

Your question is not so clear, but let me give it a try!

Let's assume your 2 points are given as (x0, y0) and (x1, y1).
The x and y distances are given as:
dx = x1 - x0;
dy = y1 - y0;

The total distance is (Pytagoras):
d = Math.sqrt(dx * dx + dy * dy);

So, to move with constant speed from (x0, y0) to (x1, y1) you have to
define a speed, e.g.
speed = 5;

Let's assume your current position is given as x and y. For each time step, you apply
the following transform:
x = x + dx * speed / d;
y = y + dy * speed / d;

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