Box2D PrismaticJoint

  • hello i want to make a side way car game but i am struggling with the suspension i want the physics behaviours to feel like the second example at the link below

    <font color=red>emanueleferonato DOT com/2009/04/06/two-ways-to-make-box2d-cars/</font>

    i downlanded some example and behaviors in tutorial section but no luck until i find out that i need a prismatic joint so i tried to ("hack") the official physics behaviours by adding this code i just figured out:

              var B2PrismaticJointDef = function( bA , bB , anchorA , anchorB , axis) {//me
    [code]
                  ?this.type = B2Joint.e_revoluteJoint ;
                  ?this.localAnchorA = new B2Vec2() ;
                  ?this.localAnchorB = new B2Vec2() ;
                  ?this.localAxisA   = new B2Vec2();//me
                  ?this.userData = null ;
                  ?if( bA !== undefined ){this.bodyA = bA ;}
    
                  ?if( bB !== undefined ){this.bodyB = bB ;}
    
                  ?if( anchorA !== undefined){this.localAnchorA.SetV(anchorA) ;}
    
                  ?if( anchorB !== undefined){this.localAnchorB.SetV(anchorB) ;}
    
                 if( axis !== undefined ){this.localAxisA.SetV(axis) ;}//me
    
                  ?
                  ?//me
    
                  ?this.enableLimit=false;
    
                  ?this.enableMotor=false;
    
                  ?this.lowerTranslation=0.0;
    
                  ?this.maxMotorForce=0.0;
    
                  ?this.motorSpeed=0.0;
    
                  ?this.referenceAngle=0.0;
    
                  ?this.upperTranslation=0.0;
    
                  ?//me
              };
    
              B2RevoluteJointDef.prototype.Initialize = function (bA, bB, anchor,axis) {
    
                  ?this.bodyA = bA;
    
                  ?this.bodyB = bB;
    
                  ?this.localAnchorA = this.bodyA.GetLocalPoint(anchor);
    
                  ?this.localAnchorB = this.bodyB.GetLocalPoint(anchor);
    
                  ?this.referenceAngle = this.bodyB.GetAngle() -this.bodyA.GetAngle();
    
                  this.localAxisA = this.bodyA.GetLocalAxis(axis);
              };
    
         Box2D.Dynamics.Joints.b2PrismaticJointDef = b2PrismaticJointDef ;
    

    in runtime.js

    "still also need to add some code to the edit.js"

    <img src="smileys/smiley18.gif" border="0" align="middle" />

    WEL it didnt work <img src="smileys/smiley19.gif" border="0" align="middle" /> what am i doing wrong please help me evry one<img src="smileys/smiley9.gif" border="0" align="middle" />

    ps:excuse my english and thank you in advance

  • Try Construct 3

    Develop games in your browser. Powerful, performant & highly capable.

    Try Now Construct 3 users don't see these ads
Jump to:
Active Users
There are 1 visitors browsing this topic (0 users and 1 guests)