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  How to make 8 directions movements  (Read 1220 times)
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Offline Miguel Atienza

Junior Newbie

Miguel lo spagnolo

« Posted 2005-12-16 18:00:27 »

Hi, I want a suggestion for my project.

I've a ball that can move automatically on 8 directions (N,NE,E,SE,S,SW,W,NW).

I've to build an array with this directions??
Offline SluX

Junior Devvie

« Reply #1 - Posted 2005-12-17 10:31:10 »

Well u might make an array with sin and cos values for given angles. Then do the math for coordinates.

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Offline Miguel Atienza

Junior Newbie

Miguel lo spagnolo

« Reply #2 - Posted 2005-12-17 15:34:06 »

So, an array where on the first element I put (0) on the second (PI/4) on the third (PI/2) ....or what??
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Offline Maverick

Senior Newbie

« Reply #3 - Posted 2005-12-17 21:03:45 »

In an array you put the radians of the different directions like this:
North = Pi/2
East = 0
West = Pi
(you complete the rest)

then by doing:
xPos += Math.cos(array[direction]); 
yPos += Math.sin(array[direction]);  

you are moving the ball in the direction you want, and can change the direction if you please. by changing the variable direction.

Offline Jeff

JGO Coder

Got any cats?

« Reply #4 - Posted 2005-12-17 23:05:16 »

Or to save the sin/cos time, you make a 2 dimensional array with the +x and +y once using sin/cos.

After that you just add the apppropriate one to the ball's x and y for each move.

But i gotta say, this smells of homework.  Any time someone says "I have to use <random programming contruct> but it is clear they have no idea what to do with it, it stinks of an assignment..

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