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AppGameKit Classic Chat / AGK physics question

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shadey
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Joined: 25th Jan 2010
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Posted: 25th Jan 2013 11:57
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How would I continually apply a force to a sprite so that i could for instance keep a ball bouncing around the screen forever ?!

Hail to the king, baby!
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The Zoq2
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Joined: 4th Nov 2009
Location: Linköping, Sweden
Posted: 25th Jan 2013 12:12
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for bouncing, you could use the SetSpritePhysicsRestitution command
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Ancient Lady
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Posted: 25th Jan 2013 15:37
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Use a combination of SetSpritePhysicsFriction, SetSpritePhysicsRestitution and SetSpritePhysicsDamping

Set SetSpritePhysicsDamping to 0 to stop all 'wind' resistance (slows it down over time.

Set SetSpritePhysicsFriction to 0 to stop friction when it hits walls.

Set SetSpritePhysicsRestitution to 1 so that it keeps all of its bounce.

You can have real fun by setting SetSpritePhysicsRestitution greater than 1 and it gains energy. I nearly laughed myself silly watching my character frantically bounce between walls the first time I did this.

Cheers,
Ancient Lady
AGK Community Tester and AppGameKit Master
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Markus
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Joined: 10th Apr 2004
Location: Germany
Posted: 29th Jan 2013 23:47 Edited at: 29th Jan 2013 23:48
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(its the same as Friction=0)
if the Velocity is under a minimum you can resize the value in the
Get XY direction
x#=getspritephysicsvelocityx(Level.Ball.spr)
y#=getspritephysicsvelocityy(Level.Ball.spr)

v#=sqrt(x#*x# + y#*y#) //vector length

x#=x#*1.01
y#=y#*1.01

SetSpritePhysicsVelocity(Level.Ball.spr,x#,y#)
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