spieleprogrammierer.de - Forum und Wiki zur Spieleprogrammierung und Spieleentwicklung

Javascript-Quelltext

//Update positioning
var frontWheelX = this.pos.x + this.wheelDistance/2 * Math.cos(this.rotation);
var frontWheelY = this.pos.y + this.wheelDistance/2 * Math.sin(this.rotation);

var backWheelX = this.pos.x - this.wheelDistance/2 * Math.cos(this.rotation);
var backWheelY = this.pos.y - this.wheelDistance/2 * Math.sin(this.rotation);

backWheelX += this.speed * tick * Math.cos(this.rotation);
backWheelY += this.speed * tick * Math.sin(this.rotation);

frontWheelX += this.speed * tick * Math.cos((this.steerAngle + this.rotation));
frontWheelY += this.speed * tick * Math.sin((this.steerAngle + this.rotation));

this.pos.x = (backWheelX + frontWheelX) / 2;
this.pos.y = (backWheelY + frontWheelY) / 2;

this.rotation = Math.atan2(frontWheelY - backWheelY, frontWheelX - backWheelX);

Javascript-Quelltext

      seek: function() {

            if (this.target != null) {

                this.steeringForce = _uv2.subtractVectors(this.target, this.drivingFocus);
                this.steeringForce = _uv2.normalize(this.steeringForce);
                this.steeringForce = _uv2.multiplyScalar(this.steeringForce, this.maxSpeed);
                this.steeringForce = _uv2.subtractVectors(this.steeringForce, this.velocity);

            }

        },

        arrive: function() {

            if (this.target != null) {

                this.steeringForce = _uv2.subtractVectors(this.target, this.drivingFocus);

                var distance = _uv2.length(this.steeringForce)

                if (distance > 0) {
                    var speed = distance * 1.5 * 0.5;
                    speed = Math.min(speed, this.maxSpeed);
                    this.steeringForce = _uv2.subtractVectors(_uv2.multiplyScalar(this.steeringForce, (speed/distance)), this.velocity);
                }

            }

        },

        calculateSteeringForce: function() {

            this.steeringForce = {x: 0, y: 0};
            this.arrive();

        },

        /**
         * Updates the car
         */
        update: function() {

            //Calculate steering forces
            this.calculateSteeringForce();

            //Update velocity
            this.velocity.x += this.steeringForce.x * tick;
            this.velocity.y += this.steeringForce.y * tick;

            //Check if current speed is not bigger than this.maxSpeed
            var currentSpeed = Math.sqrt(this.velocity.x * this.velocity.x + this.velocity.y * this.velocity.y);
            if (currentSpeed > this.maxSpeed) {
                this.velocity.x = this.velocity.x / currentSpeed * this.maxSpeed;
                this.velocity.y = this.velocity.y / currentSpeed * this.maxSpeed;
            }

            //Calculate new front-wheel position
            this.pos.x += this.velocity.x * tick;
            this.pos.y += this.velocity.y * tick;


        }

Quellcode

var speed = distance * 1.5 * 0.5;