joint wheel to body - GameCreators Forum

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Behdadsoft

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Location: Tehran-Iran

Posted: 28th Nov 2014 10:57

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Hi.

I wrote code that the wheel can rotate and move to left and right with arrow keys. now I want joint a body to wheel like a car but when do it, the wheel don't move and rotate.

I attached My Project.

Please Guide Me.

Thanks.

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CJB

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Location: Essex, UK

Posted: 28th Nov 2014 18:33

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You have welded the wheel to the body, hence it won't move. You need to create a revolute join so the wheel can revolve

Uzmadesign

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Behdadsoft

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Posted: 28th Nov 2014 19:52 Edited at: 28th Nov 2014 20:15

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Thanks, I fix it.

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Behdadsoft

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Posted: 28th Nov 2014 20:23 Edited at: 2nd Dec 2014 10:57

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when I joint wheels to body my result is similar this picture:

how can make it?

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easter bunny

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Posted: 29th Nov 2014 00:44

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Can you please post the code you're using?

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"When you've finished 90% of your game, you only have 90% left"

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Behdadsoft

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Posted: 29th Nov 2014 08:32 Edited at: 29th Nov 2014 08:34

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Quote: "Can you please post the code you're using?
"

sure.

rem Landscape App
SetDisplayAspect( 4.0/3.0 )

Wheel=CreateSprite(LoadImage("wheel.png"))
SetSpriteSize(Wheel,10,-1)
SetSpritePosition(wheel,21,90)
setSpriteShapeCircle (wheel,0,0,5)
SetSpritePhysicsOn (wheel,2)

Wheel2=CreateSprite(LoadImage("wheel.png"))
SetSpriteSize(Wheel2,10,-1)
SetSpritePosition(wheel2,40,90)
setSpriteShapeCircle (wheel2,0,0,5)
SetSpritePhysicsOn (wheel2,2)

body = CreateSprite(LoadImage("moving.png"))
SetSpriteSize (body,30,-1)
SetSpritePosition(body,20,80)
SetSpriteDepth (body,1)
SetSpritePhysicsOn(body,2)

CreateRevoluteJoint ( 1, body, wheel, 26, 96.5, 0 )
CreateRevoluteJoint ( 2, body, wheel2, 45.6, 96.5, 0 )

//SetPhysicsDebugOn ()

do
	//check left key
    if getrawkeyState(37)=1
        SetSpritePhysicsVelocity (wheel,-5,GetSpritePhysicsVelocityY(wheel))

//Check right key
	elseif getrawkeyState(39)=1
        SetSpritePhysicsVelocity (wheel,5,GetSpritePhysicsVelocityY(wheel))
    else
        SetSpritePhysicsVelocity (wheel,0,GetSpritePhysicsVelocityY(wheel))
    endif

Sync()
loop

+ Code Snippet

rem Landscape App
SetDisplayAspect( 4.0/3.0 )

Wheel=CreateSprite(LoadImage("wheel.png"))
SetSpriteSize(Wheel,10,-1)
SetSpritePosition(wheel,21,90)
setSpriteShapeCircle (wheel,0,0,5)
SetSpritePhysicsOn (wheel,2)

Wheel2=CreateSprite(LoadImage("wheel.png"))
SetSpriteSize(Wheel2,10,-1)
SetSpritePosition(wheel2,40,90)
setSpriteShapeCircle (wheel2,0,0,5)
SetSpritePhysicsOn (wheel2,2)

body = CreateSprite(LoadImage("moving.png"))
SetSpriteSize (body,30,-1)
SetSpritePosition(body,20,80)
SetSpriteDepth (body,1)
SetSpritePhysicsOn(body,2)

CreateRevoluteJoint ( 1, body, wheel, 26, 96.5, 0 )
CreateRevoluteJoint ( 2, body, wheel2, 45.6, 96.5, 0 )

//SetPhysicsDebugOn ()

do
	//check left key
    if getrawkeyState(37)=1
        SetSpritePhysicsVelocity (wheel,-5,GetSpritePhysicsVelocityY(wheel))

	//Check right key
	elseif getrawkeyState(39)=1
        SetSpritePhysicsVelocity (wheel,5,GetSpritePhysicsVelocityY(wheel))
    else
        SetSpritePhysicsVelocity (wheel,0,GetSpritePhysicsVelocityY(wheel))
    endif

 Sync()
loop

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Behdadsoft

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Posted: 30th Nov 2014 08:18

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any idea?

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Behdadsoft

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Posted: 30th Nov 2014 14:03 Edited at: 30th Nov 2014 14:12

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I think if use half shape box, make half body sprite move down, but I don't know how can resize shape box.

like this picture.

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Behdadsoft

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Posted: 1st Dec 2014 08:08

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can anyone help me?

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CJB

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Location: Essex, UK

Posted: 1st Dec 2014 10:04

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Just create the revolute joint higher up.

Uzmadesign

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baxslash

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Posted: 1st Dec 2014 11:18

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Try using "SetSpritePositionByOffset" for positioning the wheels (this command uses the centre of the sprite by default). Then create the joint at the same point. It's much easier to position sprites using an offset in my experience.

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Behdadsoft

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Posted: 2nd Dec 2014 10:54

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Quote: "Just create the revolute joint higher up.
"

Thanks CJB for your idea.

Quote: "
Try using "SetSpritePositionByOffset" for positioning the wheels (this command uses the centre of the sprite by default). Then create the joint at the same point. It's much easier to position sprites using an offset in my experience."

Thanks baxslash. yes Use SetSpritePositionByOffset is very easy and fix my Problem.

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baxslash

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Posted: 2nd Dec 2014 11:18

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Glad to help

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AppGameKit Classic Chat / joint wheel to body