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  Game-- about collision detection(J2ME)  (Read 2441 times)
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Offline c_nick

Innocent Bystander




Java games rock!


« Posted 2004-07-13 14:36:42 »

How can let one object collision with line (use J2ME)??
Eg: Have a line which slope is 2 and the object (ball ) sleep is 5 and then fly toward to that line. how can let it reflect when the object (ball) collision with line??
Offline jherber

Junior Devvie




Java games rock!


« Reply #1 - Posted 2004-07-13 15:47:45 »

try to visualize a line perpendicular to your initial line that passes through the center of your ball.

the slope of this line is the reciprical of your initial line:
http://www.purplemath.com/modules/slope2.htm

now you have two linear equations and can look at the intersection point.  

when the distance between the intersection point and the center of the ball is <= radius of the ball, you have a collision.
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