Games Polyline in X2

[ilan]

In regular box2d does not support polyline bodies so you can solve it by creating multiple bodies and connect them.
But the problem is to reference an image to such a body. In spritekit it is simple but i would like to stay cross platform and wanna use X2.

what would be the best way to do that?

another problem that i am facing is the difference between a body and the size of the graphical image. Is it possible to increase the size of the image to fit the size of the body?

Thanx

 

[Erel]

Check this answer: https://www.b4x.com/android/forum/threads/xui2d-image-body-different-size.105212/post-659107

 

[ilan]

Check this answer: https://www.b4x.com/android/forum/threads/xui2d-image-body-different-size.105212/post-659107

Thanx Erel, now its clear

 

[ilan]

hi erel, i did manage to create a multiple bodies connected to each other with a WeldJoint but i dont like the physics behavior.
if a body fall on another body the bodies disconnect and connect again so you can tell it is not a single body.

in other framework i create a body with multiple fixtures (body shape in it)
this can also be done in X2 and i think this is the correct way to do that.

    Dim testbody As X2BodyWrapper
    
    Dim bd As B2BodyDef
    bd.BodyType = bd.TYPE_DYNAMIC
    bd.Position.Set(WorldWidth/2,WorldHeight/2)
    testbody = X2.CreateBodyAndWrapper(bd, Null,"testbody")
    
    Dim circle As B2CircleShape
    circle.Initialize(0.5)

    Dim poly As B2PolygonShape
    poly.Initialize
    poly.SetAsBox(1,1)
    
    testbody.Body.CreateFixture2(poly,1)
    testbody.Body.CreateFixture2(circle,1)

it acts like a single body that has a complex shape and now we can create a much complex body but what i am missing is the Position property of the BodyShape

Fixtures - Box2D tutorials - iforce2d

Shapes​

Every fixture has a shape which is used to check for collisions with other fixtures as it moves around the scene. A shape can be a circle or a polygon. Let's set up a circle shape...

1 2 3

b2CircleShape circleShape; circleShape.m_p.Set(0, 0); //position, relative to body position circleShape.m_radius = 1; //radius

m_p.Set is missing??

 

[ilan]

here you can see the behavior:

 

[Erel]

You can do it programmatically as you did.
Another option is to create a single polygon. You can create the images at runtime or prepare them upfront.