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Asteroids Clone

Started by pat1926 Jan 14, 2004 at 10:51 PM 1 replies 350+ views

Original Post

pat1926

Jan 14, 2004 at 10:51 PM

I was just wondering how you have the same effect as Asteroids, where the ship will pass from one edge of the screen and appears at the other. I would like the object to be half drawn on one side and the rest drawn on the other as it passes over. Is there a way to do this?

FReY

Jan 15, 2004 at 2:24 AM

When you update your ships position do a check like this.



// defines for a 640 x 480 screen

#define SCREEN_LEFT_COORD    (0)
#define SCREEN_RIGHT_COORD   (640)
#define SCREEN_TOP_COORD     (0)
#define SCREEN_BOTTOM_COORD  (480)


if (shipx < SCREEN_LEFT_COORD)
  shipx += SCREEN_RIGHT_COORD;
if (shipx > SCREEN_RIGHT_COORD)
  shipx -= SCREEN_LEFT_COORD;

if (shipy < SCREEN_TOP_COORD)
  shipy += SCREEN_BOTTOM_COORD;
if (shipy > SCREEN_BOTTOM_COORD)
  shipy -= SCREEN_TOP_COORD;

So you just check if the ship is outside your screen boundary and if it is, add the width of the screen onto it''s coordinate.

Hope that helped,
FReY

constans

Jan 15, 2004 at 3:25 AM

I could put a question which is related with "wrapping". Should i clip the part which is out of sight? Or is it ok without clipping?

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