+36
-27
lines changedFilter options
+36
-27
lines changed Original file line number Diff line number Diff line change
@@ -711,6 +711,30 @@ public RopeJoint addRopeJoint(Entity e1, Entity e2, Point2D localAnchor1, Point2
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return addJoint(e1, e2, def);
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}
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/**
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* Add a prismatic joint (a slider along a given axis) between two entities.
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* More details: https://en.wikipedia.org/wiki/Prismatic_joint
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*
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* @param e1 entity1
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* @param e2 entity2
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* @param axis the axis along which to slide
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* @param limit max slide distance in pixels
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* @return joint
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*/
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public PrismaticJoint addPrismaticJoint(Entity e1, Entity e2, Point2D axis, double limit) {
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checkJointRequirements(e1, e2);
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var p1 = e1.getComponent(PhysicsComponent.class);
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var p2 = e2.getComponent(PhysicsComponent.class);
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var def = new PrismaticJointDef();
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def.initialize(p1.getBody(), p2.getBody(), p2.getBody().getWorldCenter(), toVector(axis));
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def.enableLimit = true;
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def.upperTranslation = toMetersF(limit);
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return addJoint(e1, e2, def);
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}
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/**
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* Add a joint constraining two entities with PhysicsComponent.
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* The entities must already be in the game world.
@@ -16,76 +16,61 @@
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* coincide in world space. Using local anchors and a local axis helps when saving and loading a
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* game.
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*
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* @warning at least one body should by dynamic with a non-fixed rotation.
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* @author Daniel
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* Note: at least one body should by dynamic with a non-fixed rotation.
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*
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* @author Daniel
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*/
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public class PrismaticJointDef extends JointDef<PrismaticJoint> {
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/**
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* The local anchor point relative to body1's origin.
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*/
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public final Vec2 localAnchorA;
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public final Vec2 localAnchorA = new Vec2();
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/**
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* The local anchor point relative to body2's origin.
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*/
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public final Vec2 localAnchorB;
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public final Vec2 localAnchorB = new Vec2();
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/**
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* The local translation axis in body1.
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*/
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public final Vec2 localAxisA;
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public final Vec2 localAxisA = new Vec2(1.0f, 0.0f);
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/**
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* The constrained angle between the bodies: body2_angle - body1_angle.
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*/
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public float referenceAngle;
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public float referenceAngle = 0.0f;
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/**
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* Enable/disable the joint limit.
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*/
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public boolean enableLimit;
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public boolean enableLimit = false;
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/**
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* The lower translation limit, usually in meters.
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*/
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public float lowerTranslation;
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public float lowerTranslation = 0.0f;
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/**
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* The upper translation limit, usually in meters.
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*/
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public float upperTranslation;
58 +
public float upperTranslation = 0.0f;
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/**
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* Enable/disable the joint motor.
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*/
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public boolean enableMotor;
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public boolean enableMotor = false;
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/**
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* The maximum motor torque, usually in N-m.
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*/
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public float maxMotorForce;
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public float maxMotorForce = 0.0f;
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/**
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* The desired motor speed in radians per second.
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*/
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public float motorSpeed;
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public PrismaticJointDef() {
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localAnchorA = new Vec2();
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localAnchorB = new Vec2();
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localAxisA = new Vec2(1.0f, 0.0f);
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referenceAngle = 0.0f;
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enableLimit = false;
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lowerTranslation = 0.0f;
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upperTranslation = 0.0f;
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enableMotor = false;
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maxMotorForce = 0.0f;
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motorSpeed = 0.0f;
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}
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public float motorSpeed = 0.0f;
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/**
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* Initialize the bodies, anchors, axis, and reference angle using the world anchor and world
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