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pat1926

Asteroids Clone

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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?

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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

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