Box2d如何创建滑块平台

Question

如何在Box2d中创建滑块平台？我可以像音量控制器一样从一侧移动到另一侧的平台。

Answer 1

b2PrismaticJointDef jointDef; 
    jointDef.Initialize(fixture->GetBody(), groundBody, fixture->GetBody()->GetWorldCenter(), b2Vec2(0.5f,0.0f)); 
    jointDef.maxMotorForce = 500.0; 
    jointDef.enableMotor = true; 
    jointDef.lowerTranslation = -2.5f; 
    jointDef.upperTranslation = 2.5f; 
    jointDef.enableLimit = true;