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geom/Vector.js module

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Tim Mickel 2016-01-13 16:55:55 -05:00
parent dfed05680f
commit efb1e8aee7
1 changed files with 93 additions and 93 deletions
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186
src/geom/Vector.js
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@ -1,97 +1,97 @@
Vector = function () {};
Vector.sum = function (a, b) {
var res = {};
res.x = a.x + b.x;
res.y = a.y + b.y;
return res;
};
Vector.diff = function (a, b) {
var res = {};
res.x = a.x - b.x;
res.y = a.y - b.y;
return res;
};
Vector.equal = function (a, b) {
return vlen(Vector.diff(a, b)) == 0;
};
Vector.floor = function (a) {
var res = {};
res.x = Math.floor(a.x);
res.y = Math.floor(a.y);
return res;
};
Vector.neg = function (a) {
var res = {};
res.x = -a.x;
res.y = -a.y;
return res;
};
Vector.len = function (a) {
return Math.sqrt(a.x * a.x + a.y * a.y);
};
Vector.norm = function (a) {
var len = Vector.len(a);
var res = {};
if (len == 0) {
len = 0.001;
export default class Vector {
static sum (a, b) {
var res = {};
res.x = a.x + b.x;
res.y = a.y + b.y;
return res;
}
res.x = a.x / len;
res.y = a.y / len;
return res;
};
Vector.perp = function (a) {
var res = {};
res.x = -a.y;
res.y = a.x;
return res;
};
Vector.scale = function (a, s) {
var res = {};
res.x = a.x * s;
res.y = a.y * s;
return res;
};
Vector.dot = function (a, b) {
return a.x * b.x + a.y * b.y;
};
Vector.mid = function (a, b) {
var res = {};
res.x = ((a.x + b.x) / 2);
res.y = ((a.y + b.y) / 2);
return res;
};
Vector.lineIntersect = function (v1, v2, v3, v4) {
var seg1 = Vector.diff(v2, v1);
var seg2 = Vector.diff(v4, v3);
var seg3 = Vector.diff(v1, v3);
var denom = seg2.y * seg1.x - seg2.x * seg1.y;
var numera = seg2.x * seg3.y - seg2.y * seg3.x;
var numerb = seg1.x * seg3.y - seg1.y * seg3.x;
if (denom == 0) {
return null;
static diff (a, b) {
var res = {};
res.x = a.x - b.x;
res.y = a.y - b.y;
return res;
}
var mua = numera / denom;
var mub = numerb / denom;
/* Is the intersection along the segments */
if (mua < 0 || mua > 1 || mub < 0 || mub > 1) {
return null;
static equal (a, b) {
return Vector.len(Vector.diff(a, b)) == 0;
}
var px = v1.x + mua * seg1.x;
var py = v1.y + mua * seg1.y;
return {
x: px,
y: py
};
};
static floor (a) {
var res = {};
res.x = Math.floor(a.x);
res.y = Math.floor(a.y);
return res;
}
static neg (a) {
var res = {};
res.x = -a.x;
res.y = -a.y;
return res;
}
static len (a) {
return Math.sqrt(a.x * a.x + a.y * a.y);
}
static norm (a) {
var len = Vector.len(a);
var res = {};
if (len == 0) {
len = 0.001;
}
res.x = a.x / len;
res.y = a.y / len;
return res;
}
static perp (a) {
var res = {};
res.x = -a.y;
res.y = a.x;
return res;
}
static scale (a, s) {
var res = {};
res.x = a.x * s;
res.y = a.y * s;
return res;
}
static dot (a, b) {
return a.x * b.x + a.y * b.y;
}
static mid (a, b) {
var res = {};
res.x = ((a.x + b.x) / 2);
res.y = ((a.y + b.y) / 2);
return res;
}
static lineIntersect (v1, v2, v3, v4) {
var seg1 = Vector.diff(v2, v1);
var seg2 = Vector.diff(v4, v3);
var seg3 = Vector.diff(v1, v3);
var denom = seg2.y * seg1.x - seg2.x * seg1.y;
var numera = seg2.x * seg3.y - seg2.y * seg3.x;
var numerb = seg1.x * seg3.y - seg1.y * seg3.x;
if (denom == 0) {
return null;
}
var mua = numera / denom;
var mub = numerb / denom;
/* Is the intersection along the segments */
if (mua < 0 || mua > 1 || mub < 0 || mub > 1) {
return null;
}
var px = v1.x + mua * seg1.x;
var py = v1.y + mua * seg1.y;
return {
x: px,
y: py
};
}
}