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#1 2011-03-04 16:43:10
Pong!
I need help on making a bounce engine for my pong game. I already used [Point in (direction)+180], but that wasn't realistic. Please help! 
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#3 2011-03-04 20:31:03
Re: Pong!
I tried [Point in direction (180)- Direction*2)] , but that didn't work very well. Can anyone help?
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#5 2011-03-05 02:09:20
- floppy_gunk
- Scratcher
- Registered: 2008-11-14
- Posts: 500+
Re: Pong!
ian528 wrote:
I tried [Point in direction (180)- Direction*2)] , but that didn't work very well. Can anyone help?
for bouncing on the paddle or ceiling, use [point in direction (180 - direction)], and for bouncing on the walls, use [point in direction (0 - direction)]
For a bounce on a 'curved' paddle, use this:
[set dir to direction]
[point towards paddle]
[turn clockwise (direction - dir) degrees]
Get it now! 
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#6 2011-03-05 09:37:35
Re: Pong!
floppy_gunk wrote:
For a bounce on a 'curved' paddle, use this:
[set dir to direction]
[point towards paddle]
[turn clockwise (direction - dir) degrees]
Well, the ceiling bounce works perfectly now, but the paddle bounce still gets way too glitchy. 
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#7 2011-03-05 10:48:11
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#8 2011-03-05 11:08:26
Re: Pong!
try [blocks]
<point in direction( (( <direction> <-> 90 ))
[/blocks]
instead
actually, never mind. Try looking at existing pong projects, like m44's one for example!
Last edited by LS97 (2011-03-05 11:14:16)
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#9 2011-03-09 21:02:34
Re: Pong!
Hey, I've run into this problem a while ago, and a solution. I, however, do know the 'math' way, but that's annoying, and confusing if you don't know trig. What I basically did for bouncing was invert the direction and add 180.
<point in direction( (( <direction> <*> -1 ))
<turn cw( 180 )degrees>
at least this was my code for my pong game.
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#10 2011-03-11 14:33:59
Re: Pong!
http://scratch.mit.ehttp://scratch.mit.edu/forums/viewtopic.php?pid=694442#req_messagedu/forums/viewtopic.php?pid=694442#req_messagehttp://scratch.mit.edu/forums/viewtopic.php?pid=694442#req_messagehttp://scratch.mit.edu/forums/viewtopic.php?pid=694442#req_message
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#12 2011-03-25 04:00:52
Re: Pong!
You can use -1 * direction for realistic reflection. Now, you can change to modifier to smaller or bigger value ... You can also made a pad of different parts (multiple Sprites), each part having different multiplier or angle addition.
Here is a link to an example:
http://scratch.mit.edu/projects/livedgim/1679156
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#14 2011-03-25 12:28:23
- skeletonxf
- Scratcher
- Registered: 2010-11-02
- Posts: 10
Re: Pong!
ian528 wrote:
I need help on making a bounce engine for my pong game. I already used [Point in (direction)+180], but that wasn't realistic. Please help!
bouncing is easy IF you do it right. If the paddle is at the bottom of the screen then when the ball hits the paddle, make it point at 0 or up and then TURN the balls x position - the paddles x position. this is very realistic.
Having [Point in (direction)+180 then turn x position - x position of paddle] is actualy the most realistic bouncing you can make with scratch, but it is glitchy
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#15 2011-05-20 03:21:56
- Darking1999
- New Scratcher
- Registered: 2011-05-20
- Posts: 1
Re: Pong!
<point in direction( <turn cw( )degrees><move( )steps>
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#16 2011-06-17 16:06:52
- Baseball132
- Scratcher
- Registered: 2011-06-10
- Posts: 1
Re: Pong!
You can try:
[Point in direction (0 - Ball Direction)] or [Point in direction (180 - Ball Direction)] with the Ball Direction being a variable that equals the direction of the ball. If the paddle is on the side of the screen use the first one and if its on the top/bottom use the second one. Hope this helps.
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#17 2011-08-09 13:09:43
- knightgamer27
- New Scratcher
- Registered: 2011-08-06
- Posts: 2
Re: Pong!
I tried making a pong game without referencing the script of other pong games. It seemed to work, so I uploaded it. Then I learned that it doesn't work correctly. Could someone take a look at it and identify the problem?
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