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DarkBASIC Discussion / Does anyone know how to make a ball bounce at the right angle?

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NachoMan
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Posted: 6th May 2003 20:18
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I am making breakout and I need to know how to make the ball bounce off a surface (variable) at the right angle. How exactly do you do this? I thought using the normal would help a lot. Something like ballangle# = ballangle# - normal
would this work???
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ReD_eYe
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Posted: 6th May 2003 20:52
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take a look at this breakout game, the capitals rem's(REM) are the ones you need to see, its some code i did a while ago so some of it is abit strange, the only problem is the ball tends to bounce in exactly the same pattern so you probably need some kinda random variable to add to the angle it bou8nces off at

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Hamish McHaggis
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Posted: 6th May 2003 21:27
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If the walls are horizontal or vertical then you just need to reverse the x and y movement of the ball depending on which ball it hits...

horizontal hit = reverse y movement and keep x movement the same
vertical hit = reverse x movement and keep y movement the same

Why the hell'd you ask me for crying out loud!?!

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NachoMan
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Posted: 6th May 2003 21:46
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the problem is when i have a wobbly bat and there are different angles involved. Thnks guys!
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Hamish McHaggis
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Posted: 6th May 2003 22:19
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If you understand sin() and cos() then it shouldn't be too hard to work out. Something like...

x_move#=0-sin(paddle_angle#)*max_x_move#
y_move#=0-cos(paddle_angle#)*max_y_move#

or something like that. I can't think without trying it out.

Why the hell'd you ask me for crying out loud!?!

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Shadow Robert
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Posted: 6th May 2003 23:17
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its all simple Trig, so just get out an old gcse maths book of calculus book and look up in there...
you need to figure out first the angle of attack (where its going to hit and how many degree's it is) you all you do is mirror that angle, and your all set.
that does have something to do with CoSin however, not quite in the way that Hamish has posted.

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Hamish McHaggis
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Posted: 6th May 2003 23:23
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lol!

Why the hell'd you ask me for crying out loud!?!

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kevil
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Posted: 6th May 2003 23:28
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This works, I think.

angle#=angle of the ball movement
paddle_angle#=angle of the paddle
newangle#=wrapvalue(180.0+2.0*paddle_angle#-angle#)

Kevil

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Hell IVIonkey
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Posted: 7th May 2003 00:25
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I could be wrong, but I think it's closer to something like:

newangle# = wrapvalue( 180-(angle#-paddle_angle#) )
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