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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"> | |
<title>JS Bin</title> | |
</head> | |
<body> | |
</body> | |
</html> |
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(function (w) { | |
function Vector(x, y, z) { | |
this.points = [x || 0, y || 0, z || 0]; | |
this.points._mag = Math.sqrt(this.points[0] * this.points[0] + this.points[1] * this.points[1] + this.points[2] * this.points[2]); | |
this.points.update = function () { | |
this._mag = Math.sqrt(this[0] * this[0] + this[1] * this[1] + this[2] * this[2]); | |
}; | |
this.points._angle = Math.atan2(this.points[1], this.points[0]); | |
Object.defineProperty(this.points, "angle", { | |
get: function () { | |
return this._angle; | |
}, | |
set: function (e) { | |
var smallmag = Math.sqrt(this[0] * this[0] + this[1] * this[1]); | |
this[0] = Math.cos(e) * smallmag; | |
this[1] = Math.sin(e) * smallmag; | |
this._angle = e; | |
}, | |
enumerable: true, | |
configurable: true | |
}); | |
Object.defineProperty(this.points, "mag", { | |
get: function () { | |
return this._mag; | |
}, | |
set: function (e) { | |
var ratio = e / this._mag; | |
this[0] *= ratio; | |
this[1] *= ratio; | |
this[2] *= ratio; | |
this._mag = e; | |
return this; | |
}, | |
enumerable: true, | |
configurable: true | |
}); | |
Object.defineProperty(this.points, "x", { | |
get: function () { | |
return this[0]; | |
}, | |
set: function (e) { | |
this[0] = e; | |
this.update(); | |
return this; | |
}, | |
enumerable: true, | |
configurable: true | |
}); | |
Object.defineProperty(this.points, "y", { | |
get: function () { | |
return this[1]; | |
}, | |
set: function (e) { | |
this[1] = e; | |
this.update(); | |
return this; | |
}, | |
enumerable: true, | |
configurable: true | |
}); | |
Object.defineProperty(this.points, "z", { | |
get: function () { | |
return this[2]; | |
}, | |
set: function (e) { | |
this[2] = e; | |
this.update(); | |
}, | |
enumerable: true, | |
configurable: true | |
}); | |
this.points.toString = function(){return this.join(", ");}; | |
return this.points; | |
} | |
Vector.prototype.cross = function (a, b) { | |
return vector((a.y * b.z - a.z * b.y) / (a.mag + b.mag), (a.z * b.x - a.x * b.z), (a.x * b.y - a.y * b.x)); | |
}; | |
Vector.prototype.dist = function (v1, v2) { | |
return Math.sqrt((v1.x - v2.x) * (v1.x - v2.x) + (v1.y * v2.y) * (v1.y * v2.y)); | |
}; | |
Vector.prototype.dot = function (v1, v2) { | |
return v1.x * v2.x + v1.y * v2.y + v1.z * v2.z; | |
}; | |
w.Vector = Vector.prototype; | |
w.vector = Vector; | |
})(window); | |
var a = vector(10, 3, 1); | |
var b = vector(5, 5, 5); | |
a.mag = 50; | |
b.mag = 50; | |
document.body.innerHTML += Vector.dot(a, b) / (a.mag * b.mag) + "</br>"; | |
document.body.innerHTML += a.mag + "</br>"; | |
document.body.innerHTML += b.mag + "</br>"; | |
document.body.innerHTML += Vector.cross(a, b) + "</br>"; | |
document.body.innerHTML += b + "</br>"; | |
var can = document.createElement("canvas"); | |
var c = can.getContext("2d"); | |
document.body.appendChild(can); | |
can.s = getComputedStyle(can); | |
c.translate(parseInt(can.s.width,10) / 2, parseInt(can.s.height,10) / 2); | |
c.showVectors = function(){ | |
[].slice.call(arguments,0).forEach(function(e,i,a){c.beginPath();c.moveTo(0,0);c.lineTo(e.x,e.y);c.strokeStyle = "RGB("+e.x/e.mag*255+","+e.y/e.mag*255+","+e.z/e.mag*255+")";c.stroke();c.closePath();}); | |
};c.showVectors(a,b,(Vector.cross(a,b))); |
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