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AppGameKit Classic Chat / Physics Question

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Alien Menace

AGK Developer

Years of Service

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Joined: 11th Jan 2005

Location: Earth (just visiting)

Posted: 28th Aug 2011 11:01

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Hello,

Wondering if somebody could tell me how to apply an impulse to a rotated sprite so that it moves in the direction it is pointing? How do you calculate where the impulse is suppose to originate from?

Thanks

Intel Core Duo2 Quad Q9550 @2.8 GHz - Asus P5N-D - 2x 1GB PNY GeForce GTX 460 OC SLI - 8GB RAM - Creative X-FI - Windows 7 64-bit. iPad1 16GB 3GS, iPad2 32GB WiFi, iPhone 3GS, iPhone 4

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Doz

Years of Service

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Joined: 16th Apr 2008

Location:

Posted: 28th Aug 2011 21:43

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I took out some of my variable names but this is what works for me

+ Code Snippet

if INITIAL_ANGLE => 0
            x# = - sin(INITIAL_ANGLE)
        else
            x# = sin(INITIAL_ANGLE)
        endif

        y# = cos(INITIAL_ANGLE)
  
        SetSpritePhysicsImpulse(sprite#, GetSpriteXByOffset(sprite#), GetSpriteYByOffset(sprite#), x# * velocity, y# * velocity)

Don't want to give you everything I did, but I will tell you I ended up tweaking the velocity values for x and y differently.

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AppGameKit Classic Chat / Physics Question