如何在适用于 Android 的 Box2d 中使用棱柱关节
我是 Box2d 的新手,遇到的情况是我有两个主体。一种是静态的,另一种是动态的。我希望我的动态身体向下移动并返回并沿着同一条线撞击另一个身体。经过一些初步研究后,我考虑使用棱柱形接头。我研究了一些示例并在 onLoadScene() 中编写了一段代码。但什么都没有动。代码如下:
@Override
public Scene onLoadScene()
{
.....
PrismaticJointDef prismaticJointDef = new PrismaticJointDef();
prismaticJointDef.initialize(bdy_holder, bdy_spring, bdy_holder.getWorldCenter(), new Vector2(1.0f, 0.0f));
prismaticJointDef.lowerTranslation = -5.0f;
prismaticJointDef.upperTranslation = 2.5f;
prismaticJointDef.enableLimit = true;
prismaticJointDef.maxMotorForce = 200.0f;
prismaticJointDef.motorSpeed = 10.0f;
prismaticJointDef.enableMotor = true;
prismaticJointDef.collideConnected = true;
prismatic_Joint = (PrismaticJoint)this.mPhysicsWorld.createJoint(prismaticJointDef);
}
现在我认为当我运行应用程序时,主体应该移动,但它们没有移动。我是全新的,无法弄清楚确切的问题。请指导我找到问题、解决方案和正确的使用示例。谢谢。
I am new to Box2d and have a situation where I have two bodies. One is static and the other is dynamic. I want my dynamic body to go down wards and come back and hit the other body along same line. I thought to use prismatic joint after some initial study. I have looked into some example and written a piece of code in onLoadScene(). But nothing is moving. Here is the code:
@Override
public Scene onLoadScene()
{
.....
PrismaticJointDef prismaticJointDef = new PrismaticJointDef();
prismaticJointDef.initialize(bdy_holder, bdy_spring, bdy_holder.getWorldCenter(), new Vector2(1.0f, 0.0f));
prismaticJointDef.lowerTranslation = -5.0f;
prismaticJointDef.upperTranslation = 2.5f;
prismaticJointDef.enableLimit = true;
prismaticJointDef.maxMotorForce = 200.0f;
prismaticJointDef.motorSpeed = 10.0f;
prismaticJointDef.enableMotor = true;
prismaticJointDef.collideConnected = true;
prismatic_Joint = (PrismaticJoint)this.mPhysicsWorld.createJoint(prismaticJointDef);
}
Now I think the bodies should be moving when I run the application, but they are not movng. I am totally new and can't figure out the exact problem. Kindly guide me to the problem, solution and proper example of using this. Thanks.
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