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- var Vector = function(x, y) {
- this.x = x || 0;
- this.y = y || 0;
- };
- // return the angle of the vector in radians
- Vector.prototype.getDirection = function() {
- return Math.atan2(this.y, this.x);
- };
- // set the direction of the vector in radians
- Vector.prototype.setDirection = function(direction) {
- var magnitude = this.getMagnitude();
- this.x = Math.cos(angle) * magnitude;
- this.y = Math.sin(angle) * magnitude;
- };
- // get the magnitude of the vector
- Vector.prototype.getMagnitude = function() {
- // use pythagoras theorem to work out the magnitude of the vector
- return Math.sqrt(this.x * this.x + this.y * this.y);
- };
- // set the magnitude of the vector
- Vector.prototype.setMagnitude = function(magnitude) {
- var direction = this.getDirection();
- this.x = Math.cos(direction) * magnitude;
- this.y = Math.sin(direction) * magnitude;
- };
- // add two vectors together and return a new one
- Vector.prototype.add = function(v2) {
- return new Vector(this.x + v2.x, this.y + v2.y);
- };
- // add a vector to this one
- Vector.prototype.addTo = function(v2) {
- this.x += v2.x;
- this.y += v2.y;
- };
- // subtract two vectors and reutn a new one
- Vector.prototype.subtract = function(v2) {
- return new Vector(this.x - v2.x, this.y - v2.y);
- };
- // subtract a vector from this one
- Vector.prototype.subtractFrom = function(v2) {
- this.x -= v2.x;
- this.y -= v2.y;
- };
- // multiply this vector by a scalar and return a new one
- Vector.prototype.multiply = function(scalar) {
- return new Vector(this.x * scalar, this.y * scalar);
- };
- // multiply this vector by the scalar
- Vector.prototype.multiplyBy = function(scalar) {
- this.x *= scalar;
- this.y *= scalar;
- };
- // scale this vector by scalar and return a new vector
- Vector.prototype.divide = function(scalar) {
- return new Vector(this.x / scalar, this.y / scalar);
- };
- // scale this vector by scalar
- Vector.prototype.divideBy = function(scalar) {
- this.x /= scalar;
- this.y /= scalar;
- };
- // Aliases
- Vector.prototype.getLength = Vector.prototype.getMagnitude;
- Vector.prototype.setLength = Vector.prototype.setMagnitude;
- Vector.prototype.getAngle = Vector.prototype.getDirection;
- Vector.prototype.setAngle = Vector.prototype.setDirection;
- // Utilities
- Vector.prototype.copy = function() {
- return new Vector(this.x, this.y);
- };
- Vector.prototype.toString = function() {
- return 'x: ' + this.x + ', y: ' + this.y;
- };
- Vector.prototype.toArray = function() {
- return [this.x, this.y];
- };
- Vector.prototype.toObject = function() {
- return {x: this.x, y: this.y};
- };
- // dot product of two vectors
- Vector.prototype.dotProduct = function(v2) {
- return this.x * v2.x + this.y *v2.y;
- }
- // normalize a given vector
- Vector.prototype.normalize = function(){
- return new Vector(this.x/(Math.sqrt(this.x * this.x + this.y * this.y)), this.y/(Math.sqrt(this.x * this.x + this.y * this.y)));
- }
- // To add
- // Scale
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