まず、以下に投稿する JavaScript コードで「最大コール スタック サイズを超えました」というエラーが発生しましたが、それがどこから来ているのかわかりません。再帰的に何かを呼び出しているとは思いませんし、周りを見回してもエラーの他の原因を見つけることができませんでした。プログラムの実行にChromeを使用しており、コンソールから取得できる詳細は「Vector Vector Vector Vector Vector Vector Vector...」などだけです。これは、Vector関数が再帰的に自分自身を呼び出していることを意味すると思いますが、 、繰り返しますが、それがどこで起こっているのかわかりません。まず、Vector 関数を次に示します。
function Vector(top,left) { //a vector constructor, with all necessary vector operations
this.top = top; //the 'top' component, which points down
this.left = left; //the 'left' component, which points right
this.in = 0; //the 'in' component, which points out of the screen
this.magnitude = Math.sqrt(this.top*this.top+this.left*this.left); //the magnitude of the vector
this.reverse = new Vector(-this.top,-this.left); //the vector that points opposite of this vector
this.unit = this.Scale(1/this.magnitude); //the unit vector pointing in this vector's direction
this.Scale = Scale; //multiplying vectors by a constant
this.Add = Add; //easier vector addition
this.Subtract = Subtract; //and subtraction
this.Dot = Dot; //a dot product operation
this.Cross = Cross; //the cross product of two planar vectors; it returns the 'in' component of the resulting vector
this.Project = Project; //the projetion of the parameter vector onto this vector
function Scale(scalar) {return new Vector(scalar*this.top,scalar*this.left);}
function Add(vector) {return new Vector(this.top+vector.top,this.left+vector.left);}
function Subtract(vector) {return new Vector(this.top-vector.top,this.left-vector.left);} //the abovedescribed methods
function Dot(vector) {return this.top*vector.top+this.left*vector.left;}
function Cross(vector) {return this.top*vector.left-this.left*vector.top;}
function Project(vector) {return this.Scale(this.Dot(vector)/Math.pow(this.magnitude,2))}
}
var zeroVector = new Vector(0,0);
そして、ここに完全なコードがあります。完全に無視してかまいませんが、私には完璧に隠されている何かがあなたにとって露骨に明らかになるかもしれません。
<!DOCTYPE html>
<html>
<head>
<title>temp</title>
</head>
<body>
<canvas
id="canvas"
height="768px"
width="1366px"
style="position:fixed;top:0px;left:0px;"
/>
</body>
<script>
/*------------------------------------------------------------Composition Center--------------------------------------------------*/ {
window.onload = run; //it'll start running as soon as it's started up
var interval; //the interval variable for the 'run' function
function run() {
interval = setInterval(function() {
for (i=0; i!=0; i++) {
var Point = point;
var vPrime = zeroVector;
var netForce = zeroVector;
for (j=0; j!=0; j++) {
var Edge = edge;
updateCollision(Point,Edge);
}
updatePosition(Point);
updateVelocity(Point);
draw();
}
},16);
}
/*---------------------------------------------------------------------------------------------------------------------------------*/ }
/*-------------------------------------------------------------Physics Engine------------------------------------------------------*/ {
//--Constructors--//
function PointObject(mass,top,left) { //a point object
this.mass = mass; //mass
this.position = new Vector(top,left); //position
this.velocity = zeroVector; //velocity
this.near = nullEdge; //a memory tool which stores the edge the point is close to
}
function Rectangle(top,left,height,width) { //a rectangle that'll be solid, but not affected by gravity or anything
this.position = new Vector(top,left);
this.height = height; //self-explanatory
this.width = width;
}
function Edge(start,end) {
this.start = start; //the start point (vector)
this.end = end; //end point (vector)
this.vector = end.Subtract(start); //the vector pointing from the start to the end point of the edge
this.RUN = new Vector(this.vector.left,-this.vector.top).unit; //the RIGHT pointing UNIT NORMAL vector to the edge vector
this.rightPermeable = false; //whether or not the edge can be passed through from the right to the left
this.leftPermeable = true; //or from the left to the right
}
//--Objects--//
var base = new Rectangle(3/4*768,33,768/4,1300); //the main base solid
var point = new PointObject(1,base.position.top-201,1366/2); //the point object at the center of this whole ordeal
var edge = new Edge(new Vector(base.position.top,base.position.left+base.width),base.position); //a test edge. they'll be auto-assembled later
var nullEdge = new Edge(zeroVector,zeroVector);
var deltaT = .01; //standard time interval
//--Loop o' Physics--//
//Update Collision
function updateCollision(Point,edge) { //check if any points are crossing edges and deal with that
var startToPoint = Point.position.Subtract(edge.start); //the vector from the start point of the edge to the tested point
if (edge.rightPermeable && edge.vector.Cross(startToPoint) < 0) {return "Negatory.";} //if it could only approach from a permeable side, stop testing
if (edge.leftPermeable && edge.vector.Cross(startToPoint) > 0) {return "Negatory.";}
var projection = edge.vector.Project(startToPoint); //the projection of that vector onto the edge vector
if (projection.Dot(edge.vector) < 0) {return "Negatory.";} //if it's not pointing in the same dircetion as the edge vector, it's not gonna hit the edge
var distance = startToPoint.Subtract(projection); //the normal vector to the edge that points to the Point
var velocity = distance.Project(Point.velocity); //the component of the point's velocity orthogonal to the edge
if (distance.Dot(velocity) >= 0) {return "Negatory.";} //if the orthogonal velocity component is pointing 'to the point,' it won't collide
var specificT = distance.magnitude/velocity.magnitude; //the time it'll take for the point to hit the edge, if it continues with it's current velocity
if (deltaT <= specificT) {return "Negatory.";} //if the point can't move far enough to cover the distance, it won't collide
//at this point, the collision will happen
Point.near = edge; //have the point remember that it collided with this edge, so it won't have to be totally re-tested for normal forces
Point.position = Point.position.Add(Point.velocity.Scale(specificT)).Add(distance.Scale(.0001)); //move the point just a wee bit away from the edge
vPrime = Point.velocity.Add(velocity.reverse); //impulse away the velocity orthogonal to the edge
Point.velocity = Point.velocity.Scale(0); //zero the current velocity
}
//Update Position
function updatePosition(Point) {Point.position = Point.position.Add(Point.velocity.Scale(deltaT));} //d=vt, essentially
//Update Velocity
function updateVelocity(Point) { //via forces
var gravity = new Vector(20,0); //gravity... hobviously
netForce = netForce.Add(gravity); //add up all the current forces to get the right normal force
if (Point.near != nullEdge) { //calculating normal force, so it needs to be near an edge
var startToPoint = Point.position.Subtract(Point.near.start);
var projection = Point.near.vector.Project(startToPoint); //same stuff as earlier
var distance = startToPoint.Subtract(projection);
if (distance.magnitude <= .01) { //if it's very near to the edge
normalForce = distance.Project(netForce.reverse); //exert enough force to cancel anything going into the edge
if (normalForce.Dot(distance) > 0) {netForce = netForce.Add(normalForce);} //if it is indeed going into the edge
} else if (distance.magnitude > 1) {Point.near = nullEdge;} //it's not near the edge any more
}
Point.velocity = Point.velocity.Add(netForce.Scale(deltaT/Point.mass)); //v=at, essentially
}
/*---------------------------------------------------------------------------------------------------------------------------------*/ }
/*----------------------------------------------------Graphics----------------------------------------------------------------------*/ {
var c = document.getElementById("canvas").getContext("2d"); //the means for drawing all this
PointObject.prototype.Draw = function() { //the draw method for point objects
c.fillStyle = "#000000"; //a black square with the point at its center pixel
c.fillRect(this.position.left-2,this.position.top-2,5,5);
}
Rectangle.prototype.Draw = function() { //draw method for rectangles
c.fillStyle = "#c0c0c0"; //a grey rectangle; the position is the top left corner
c.fillRect(this.position.left,this.position.top,this.width,this.height);
}
function draw() { //draws everything
c.clearRect(0,0,1366,768); //clear the screen
base.Draw(); //paint stuff
point.Draw();
}
/*----------------------------------------------------------------------------------------------------------------------------------*/ }
/*------------------------------------------------------------Math Tools-------------------------------------------------------------*/ {
//--Vector Tools--//
function Vector(top,left) { //a vector constructor, with all necessary vector operations
this.top = top; //the 'top' component, which points down
this.left = left; //the 'left' component, which points right
this.in = 0; //the 'in' component, which points out of the screen
this.magnitude = Math.sqrt(this.top*this.top+this.left*this.left); //the magnitude of the vector
this.reverse = new Vector(-this.top,-this.left); //the vector that points opposite of this vector
this.unit = this.Scale(1/this.magnitude); //the unit vector pointing in this vector's direction
this.Scale = Scale; //multiplying vectors by a constant
this.Add = Add; //easier vector addition
this.Subtract = Subtract; //and subtraction
this.Dot = Dot; //a dot product operation
this.Cross = Cross; //the cross product of two planar vectors; it returns the 'in' component of the resulting vector
this.Project = Project; //the projetion of the parameter vector onto this vector
function Scale(scalar) {return new Vector(scalar*this.top,scalar*this.left);}
function Add(vector) {return new Vector(this.top+vector.top,this.left+vector.left);}
function Subtract(vector) {return new Vector(this.top-vector.top,this.left-vector.left);} //the abovedescribed methods
function Dot(vector) {return this.top*vector.top+this.left*vector.left;}
function Cross(vector) {return this.top*vector.left-this.left*vector.top;}
function Project(vector) {return this.Scale(this.Dot(vector)/Math.pow(this.magnitude,2))}
}
var zeroVector = new Vector(0,0);
/*-----------------------------------------------------------------------------------------------------------------------------------*/ }
</script>
</html>
とにかく、2 つ目は、Vector コンストラクターのいくつかのビットをどのように記述したかについてです。これが何らかの形でエラーを引き起こしている可能性があります。さまざまな時点で、関数のプロパティとメソッドで「new Vector()」を使用していますが、それが違法かどうかはわかりません。以前にエラーなしで実行したと思いますが、よくわかりません。
また、「マグニチュード」、「リバース」、「ユニット」のプロパティについては、メソッドと言い換えるべきでしょうか? 作成時にベクトルの大きさ/逆/単位ベクトルにロックされていると思うので、上部または左側のプロパティが変更されると、間違った値が返されます。私がまだそれらを変更していない唯一の理由は、それらがメソッドというよりもプロパティとして、単に概念的に私を襲ったからです。まだ問題は発生していません。ただ疑問に思っています。
JSFiddle などでこれが必要な場合は、喜んで対応させていただきます。