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Copy pathvec2.js
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535 lines (482 loc) · 16 KB
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Object.assign(pc, (function () {
'use strict';
/**
* @constructor
* @name pc.Vec2
* @classdesc A 2-dimensional vector.
* @description Creates a new Vec2 object.
* @param {Number} [x] The x value. If x is an array of length 2, the array will be used to populate all components.
* @param {Number} [y] The y value.
* @example
* var v = new pc.Vec2(1, 2);
*/
var Vec2 = function (x, y) {
if (x && x.length === 2) {
this.data = new Float32Array(x);
return;
}
this.data = new Float32Array(2);
this.data[0] = x || 0;
this.data[1] = y || 0;
};
Object.assign(Vec2.prototype, {
/**
* @function
* @name pc.Vec2#add
* @description Adds a 2-dimensional vector to another in place.
* @param {pc.Vec2} rhs The vector to add to the specified vector.
* @returns {pc.Vec2} Self for chaining.
* @example
* var a = new pc.Vec2(10, 10);
* var b = new pc.Vec2(20, 20);
*
* a.add(b);
*
* // Should output [30, 30]
* console.log("The result of the addition is: " + a.toString());
*/
add: function (rhs) {
var a = this.data,
b = rhs.data;
a[0] += b[0];
a[1] += b[1];
return this;
},
/**
* @function
* @name pc.Vec2#add2
* @description Adds two 2-dimensional vectors together and returns the result.
* @param {pc.Vec2} lhs The first vector operand for the addition.
* @param {pc.Vec2} rhs The second vector operand for the addition.
* @returns {pc.Vec2} Self for chaining.
* @example
* var a = new pc.Vec2(10, 10);
* var b = new pc.Vec2(20, 20);
* var r = new pc.Vec2();
*
* r.add2(a, b);
* // Should output [30, 30]
*
* console.log("The result of the addition is: " + r.toString());
*/
add2: function (lhs, rhs) {
var a = lhs.data,
b = rhs.data,
r = this.data;
r[0] = a[0] + b[0];
r[1] = a[1] + b[1];
return this;
},
/**
* @function
* @name pc.Vec2#clone
* @description Returns an identical copy of the specified 2-dimensional vector.
* @returns {pc.Vec2} A 2-dimensional vector containing the result of the cloning.
* @example
* var v = new pc.Vec2(10, 20);
* var vclone = v.clone();
* console.log("The result of the cloning is: " + vclone.toString());
*/
clone: function () {
return new Vec2().copy(this);
},
/**
* @function
* @name pc.Vec2#copy
* @description Copied the contents of a source 2-dimensional vector to a destination 2-dimensional vector.
* @param {pc.Vec2} rhs A vector to copy to the specified vector.
* @returns {pc.Vec2} Self for chaining.
* @example
* var src = new pc.Vec2(10, 20);
* var dst = new pc.Vec2();
*
* dst.copy(src);
*
* console.log("The two vectors are " + (dst.equals(src) ? "equal" : "different"));
*/
copy: function (rhs) {
var a = this.data,
b = rhs.data;
a[0] = b[0];
a[1] = b[1];
return this;
},
/**
* @function
* @name pc.Vec2#dot
* @description Returns the result of a dot product operation performed on the two specified 2-dimensional vectors.
* @param {pc.Vec2} rhs The second 2-dimensional vector operand of the dot product.
* @returns {Number} The result of the dot product operation.
* @example
* var v1 = new pc.Vec2(5, 10);
* var v2 = new pc.Vec2(10, 20);
* var v1dotv2 = v1.dot(v2);
* console.log("The result of the dot product is: " + v1dotv2);
*/
dot: function (rhs) {
var a = this.data,
b = rhs.data;
return a[0] * b[0] + a[1] * b[1];
},
/**
* @function
* @name pc.Vec2#equals
* @description Reports whether two vectors are equal.
* @param {pc.Vec2} rhs The vector to compare to the specified vector.
* @returns {Boolean} true if the vectors are equal and false otherwise.
* @example
* var a = new pc.Vec2(1, 2);
* var b = new pc.Vec2(4, 5);
* console.log("The two vectors are " + (a.equals(b) ? "equal" : "different"));
*/
equals: function (rhs) {
var a = this.data,
b = rhs.data;
return a[0] === b[0] && a[1] === b[1];
},
/**
* @function
* @name pc.Vec2#length
* @description Returns the magnitude of the specified 2-dimensional vector.
* @returns {Number} The magnitude of the specified 2-dimensional vector.
* @example
* var vec = new pc.Vec2(3, 4);
* var len = vec.length();
* // Should output 5
* console.log("The length of the vector is: " + len);
*/
length: function () {
var v = this.data;
return Math.sqrt(v[0] * v[0] + v[1] * v[1]);
},
/**
* @function
* @name pc.Vec2#lengthSq
* @description Returns the magnitude squared of the specified 2-dimensional vector.
* @returns {Number} The magnitude of the specified 2-dimensional vector.
* @example
* var vec = new pc.Vec2(3, 4);
* var len = vec.lengthSq();
* // Should output 25
* console.log("The length squared of the vector is: " + len);
*/
lengthSq: function () {
var v = this.data;
return v[0] * v[0] + v[1] * v[1];
},
/**
* @function
* @name pc.Vec2#lerp
* @description Returns the result of a linear interpolation between two specified 2-dimensional vectors.
* @param {pc.Vec2} lhs The 2-dimensional to interpolate from.
* @param {pc.Vec2} rhs The 2-dimensional to interpolate to.
* @param {Number} alpha The value controlling the point of interpolation. Between 0 and 1, the linear interpolant
* will occur on a straight line between lhs and rhs. Outside of this range, the linear interpolant will occur on
* a ray extrapolated from this line.
* @returns {pc.Vec2} Self for chaining.
* @example
* var a = new pc.Vec2(0, 0);
* var b = new pc.Vec2(10, 10);
* var r = new pc.Vec2();
*
* r.lerp(a, b, 0); // r is equal to a
* r.lerp(a, b, 0.5); // r is 5, 5
* r.lerp(a, b, 1); // r is equal to b
*/
lerp: function (lhs, rhs, alpha) {
var a = lhs.data,
b = rhs.data,
r = this.data;
r[0] = a[0] + alpha * (b[0] - a[0]);
r[1] = a[1] + alpha * (b[1] - a[1]);
return this;
},
/**
* @function
* @name pc.Vec2#mul
* @description Multiplies a 2-dimensional vector to another in place.
* @param {pc.Vec2} rhs The 2-dimensional vector used as the second multiplicand of the operation.
* @returns {pc.Vec2} Self for chaining.
* @example
* var a = new pc.Vec2(2, 3);
* var b = new pc.Vec2(4, 5);
*
* a.mul(b);
*
* // Should output 8, 15
* console.log("The result of the multiplication is: " + a.toString());
*/
mul: function (rhs) {
var a = this.data,
b = rhs.data;
a[0] *= b[0];
a[1] *= b[1];
return this;
},
/**
* @function
* @name pc.Vec2#mul2
* @description Returns the result of multiplying the specified 2-dimensional vectors together.
* @param {pc.Vec2} lhs The 2-dimensional vector used as the first multiplicand of the operation.
* @param {pc.Vec2} rhs The 2-dimensional vector used as the second multiplicand of the operation.
* @returns {pc.Vec2} Self for chaining.
* @example
* var a = new pc.Vec2(2, 3);
* var b = new pc.Vec2(4, 5);
* var r = new pc.Vec2();
*
* r.mul2(a, b);
*
* // Should output 8, 15
* console.log("The result of the multiplication is: " + r.toString());
*/
mul2: function (lhs, rhs) {
var a = lhs.data,
b = rhs.data,
r = this.data;
r[0] = a[0] * b[0];
r[1] = a[1] * b[1];
return this;
},
/**
* @function
* @name pc.Vec2#normalize
* @description Returns the specified 2-dimensional vector copied and converted to a unit vector.
* If the vector has a length of zero, the vector's elements will be set to zero.
* @returns {pc.Vec2} Self for chaining.
* @example
* var v = new pc.Vec2(25, 0);
*
* v.normalize();
*
* // Should output 1, 0
* console.log("The result of the vector normalization is: " + v.toString());
*/
normalize: function () {
var v = this.data;
var lengthSq = v[0] * v[0] + v[1] * v[1];
if (lengthSq > 0) {
var invLength = 1 / Math.sqrt(lengthSq);
v[0] *= invLength;
v[1] *= invLength;
}
return this;
},
/**
* @function
* @name pc.Vec2#scale
* @description Scales each component of the specified 2-dimensional vector by the supplied
* scalar value.
* @param {Number} scalar The value by which each vector component is multiplied.
* @returns {pc.Vec2} Self for chaining.
* @example
* var v = new pc.Vec2(2, 4);
*
* // Multiply by 2
* v.scale(2);
*
* // Negate
* v.scale(-1);
*
* // Divide by 2
* v.scale(0.5);
*/
scale: function (scalar) {
var v = this.data;
v[0] *= scalar;
v[1] *= scalar;
return this;
},
/**
* @function
* @name pc.Vec2#set
* @description Sets the specified 2-dimensional vector to the supplied numerical values.
* @param {Number} x The value to set on the first component of the vector.
* @param {Number} y The value to set on the second component of the vector.
* @returns {pc.Vec2} Self for chaining.
* @example
* var v = new pc.Vec2();
* v.set(5, 10);
*
* // Should output 5, 10
* console.log("The result of the vector set is: " + v.toString());
*/
set: function (x, y) {
var v = this.data;
v[0] = x;
v[1] = y;
return this;
},
/**
* @function
* @name pc.Vec2#sub
* @description Subtracts a 2-dimensional vector from another in place.
* @param {pc.Vec2} rhs The vector to add to the specified vector.
* @returns {pc.Vec2} Self for chaining.
* @example
* var a = new pc.Vec2(10, 10);
* var b = new pc.Vec2(20, 20);
*
* a.sub(b);
*
* // Should output [-10, -10]
* console.log("The result of the addition is: " + a.toString());
*/
sub: function (rhs) {
var a = this.data,
b = rhs.data;
a[0] -= b[0];
a[1] -= b[1];
return this;
},
/**
* @function
* @name pc.Vec2#sub2
* @description Subtracts two 2-dimensional vectors from one another and returns the result.
* @param {pc.Vec2} lhs The first vector operand for the addition.
* @param {pc.Vec2} rhs The second vector operand for the addition.
* @returns {pc.Vec2} Self for chaining.
* @example
* var a = new pc.Vec2(10, 10);
* var b = new pc.Vec2(20, 20);
* var r = new pc.Vec2();
*
* r.sub2(a, b);
*
* // Should output [-10, -10]
* console.log("The result of the addition is: " + r.toString());
*/
sub2: function (lhs, rhs) {
var a = lhs.data,
b = rhs.data,
r = this.data;
r[0] = a[0] - b[0];
r[1] = a[1] - b[1];
return this;
},
/**
* @function
* @name pc.Vec2#toString
* @description Converts the vector to string form.
* @returns {String} The vector in string form.
* @example
* var v = new pc.Vec2(20, 10);
* // Should output '[20, 10]'
* console.log(v.toString());
*/
toString: function () {
return '[' + this.data[0] + ', ' + this.data[1] + ']';
}
});
/**
* @field
* @type Number
* @name pc.Vec2#x
* @description The first element of the vector.
* @example
* var vec = new pc.Vec2(10, 20);
*
* // Get x
* var x = vec.x;
*
* // Set x
* vec.x = 0;
*/
Object.defineProperty(Vec2.prototype, 'x', {
get: function () {
return this.data[0];
},
set: function (value) {
this.data[0] = value;
}
});
/**
* @field
* @type Number
* @name pc.Vec2#y
* @description The second element of the vector.
* @example
* var vec = new pc.Vec2(10, 20);
*
* // Get y
* var y = vec.y;
*
* // Set y
* vec.y = 0;
*/
Object.defineProperty(Vec2.prototype, 'y', {
get: function () {
return this.data[1];
},
set: function (value) {
this.data[1] = value;
}
});
/**
* @field
* @static
* @readonly
* @type pc.Vec2
* @name pc.Vec2.ONE
* @description A constant vector set to [1, 1].
*/
Object.defineProperty(Vec2, 'ONE', {
get: (function () {
var one = new Vec2(1, 1);
return function () {
return one;
};
}())
});
/**
* @field
* @static
* @readonly
* @type pc.Vec2
* @name pc.Vec2.RIGHT
* @description A constant vector set to [1, 0].
*/
Object.defineProperty(Vec2, 'RIGHT', {
get: (function () {
var right = new Vec2(1, 0);
return function () {
return right;
};
}())
});
/**
* @field
* @static
* @readonly
* @type pc.Vec2
* @name pc.Vec2.UP
* @description A constant vector set to [0, 1].
*/
Object.defineProperty(Vec2, 'UP', {
get: (function () {
var down = new Vec2(0, 1);
return function () {
return down;
};
}())
});
/**
* @field
* @static
* @readonly
* @type pc.Vec2
* @name pc.Vec2.ZERO
* @description A constant vector set to [0, 0].
*/
Object.defineProperty(Vec2, 'ZERO', {
get: (function () {
var zero = new Vec2(0, 0);
return function () {
return zero;
};
}())
});
return {
Vec2: Vec2
};
}()));