142 lines
4.5 KiB
JavaScript
142 lines
4.5 KiB
JavaScript
/**
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*
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* @param id
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* @param name
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* @param splineCurve3
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* @param accel
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* @param maxSpeed
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* @param baseOffset
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* @param maxOffset
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* @param steeringSpeed
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* @constructor
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*/
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GameLib.D3.ComponentPathFollowing = function ComponentPathFollowing(
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id,
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name,
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splineCurve3,
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accel,
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maxSpeed,
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baseOffset,
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maxOffset,
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steeringSpeed
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) {
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this.id = id || GameLib.D3.Tools.RandomId();
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if (typeof name == 'undefined') {
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name = this.constructor.name;
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}
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this.name = name;
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this.parentEntity = null;
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this.splineCurve3 = splineCurve3;
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this.maxSpeed = maxSpeed || 10.0;
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this.accel = accel || 2.0;
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this.baseOffset = baseOffset || new GameLib.D3.Vector3();
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this.maxOffset = maxOffset || new GameLib.D3.Vector3(Number.MAX_SAFE_INTEGER, Number.MAX_SAFE_INTEGER, Number.MAX_SAFE_INTEGER);
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this.steeringSpeed = steeringSpeed || 1.0;
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//#ifdef RUNTIME__
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// runtime code
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this.offset = new GameLib.D3.Vector3(); // this one is our destination offset
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this.currentOffset = new GameLib.D3.Vector3();
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this.currentPathValue = 0.0;
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this.currentSpeed = 0.0;
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this.direction = 0;
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//#endif
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GameLib.D3.Utils.Extend(GameLib.D3.ComponentPathFollowing, GameLib.D3.ComponentInterface);
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};
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//#ifdef RUNTIME__
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///////////////////////// Methods to override //////////////////////////
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GameLib.D3.ComponentPathFollowing.prototype.onUpdate = function(
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deltaTime,
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parentEntity
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) {
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if(this.splineCurve3) {
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if(this.currentPathValue >= 1 || this.currentPathValue < 0) {
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this.currentPathValue = 0;
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}
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//To maintain a constant speed, you use .getPointAt( t ) instead of .getPoint( t ).
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//http://stackoverflow.com/questions/18400667/three-js-object-following-a-spline-path-rotation-tanget-issues-constant-sp
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var position = this.splineCurve3.getPointAt(this.currentPathValue);
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var rotation = this.splineCurve3.getTangentAt(this.currentPathValue).normalize();
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// extract rotation
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var forward = new THREE.Vector3(-1, 0, 0);
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var axis = new THREE.Vector3();
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axis.crossVectors(forward, rotation).normalize();
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var radians = Math.acos(forward.dot(rotation));
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var quaternion = new THREE.Quaternion().setFromAxisAngle(axis, radians);
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{ // update current speed
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var t = deltaTime * this.accel;
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t = t * t * t * (t * (6.0 * t - 15.0) + 10.0);
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this.currentSpeed = this.currentSpeed + (this.maxSpeed * this.direction - this.currentSpeed) * t;
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}
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{ // update position
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var t = deltaTime * this.accel;
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t = t * t * t * (t * (6.0 * t - 15.0) + 10.0);
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var lerpedOffset = new THREE.Vector3(
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this.currentOffset.x,
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this.currentOffset.y,
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this.currentOffset.z
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).lerp(new THREE.Vector3(
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this.maxOffset.x * this.offset.x,
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this.maxOffset.y * this.offset.y,
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this.maxOffset.z * this.offset.z
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), t);
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this.currentOffset.x = lerpedOffset.x;
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this.currentOffset.y = lerpedOffset.y;
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this.currentOffset.z = lerpedOffset.z;
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var transformedOffset = new THREE.Vector3(
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this.baseOffset.x + lerpedOffset.x,
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this.baseOffset.y + lerpedOffset.y,
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this.baseOffset.z + lerpedOffset.z
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).applyQuaternion(quaternion);
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// apply to parent rigidbody instead of direclty to the mesh.
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parentEntity.position.x = position.x + transformedOffset.x;
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parentEntity.position.y = position.y + transformedOffset.y;
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parentEntity.position.z = position.z + transformedOffset.z;
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}
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{ // update rotation
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parentEntity.quaternion.x = quaternion.x;
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parentEntity.quaternion.y = quaternion.y;
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parentEntity.quaternion.z = quaternion.z;
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parentEntity.quaternion.w = quaternion.w;
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}
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// update current path value & check bounds
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this.currentPathValue += (this.currentSpeed);
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if(this.currentSpeed >= this.maxSpeed) {
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this.currentSpeed = this.maxSpeed;
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} else if (this.currentSpeed <= 0) {
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this.currentSpeed = 0.0;
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}
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}
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};
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//#endif
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GameLib.D3.ComponentPathFollowing.prototype.onSetParentEntity = function(
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parentScene,
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parentEntity
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) {
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if(!this.splineCurve3) {
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console.error("NO PATH GIVEN");
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}
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}; |