bd028579
 易尊强
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export function create(x, y) {
if (x == null) {
x = 0;
}
if (y == null) {
y = 0;
}
return [x, y];
}
export function copy(out, v) {
out[0] = v[0];
out[1] = v[1];
return out;
}
export function clone(v) {
return [v[0], v[1]];
}
export function set(out, a, b) {
out[0] = a;
out[1] = b;
return out;
}
export function add(out, v1, v2) {
out[0] = v1[0] + v2[0];
out[1] = v1[1] + v2[1];
return out;
}
export function scaleAndAdd(out, v1, v2, a) {
out[0] = v1[0] + v2[0] * a;
out[1] = v1[1] + v2[1] * a;
return out;
}
export function sub(out, v1, v2) {
out[0] = v1[0] - v2[0];
out[1] = v1[1] - v2[1];
return out;
}
export function len(v) {
return Math.sqrt(lenSquare(v));
}
export var length = len;
export function lenSquare(v) {
return v[0] * v[0] + v[1] * v[1];
}
export var lengthSquare = lenSquare;
export function mul(out, v1, v2) {
out[0] = v1[0] * v2[0];
out[1] = v1[1] * v2[1];
return out;
}
export function div(out, v1, v2) {
out[0] = v1[0] / v2[0];
out[1] = v1[1] / v2[1];
return out;
}
export function dot(v1, v2) {
return v1[0] * v2[0] + v1[1] * v2[1];
}
export function scale(out, v, s) {
out[0] = v[0] * s;
out[1] = v[1] * s;
return out;
}
export function normalize(out, v) {
var d = len(v);
if (d === 0) {
out[0] = 0;
out[1] = 0;
}
else {
out[0] = v[0] / d;
out[1] = v[1] / d;
}
return out;
}
export function distance(v1, v2) {
return Math.sqrt((v1[0] - v2[0]) * (v1[0] - v2[0])
+ (v1[1] - v2[1]) * (v1[1] - v2[1]));
}
export var dist = distance;
export function distanceSquare(v1, v2) {
return (v1[0] - v2[0]) * (v1[0] - v2[0])
+ (v1[1] - v2[1]) * (v1[1] - v2[1]);
}
export var distSquare = distanceSquare;
export function negate(out, v) {
out[0] = -v[0];
out[1] = -v[1];
return out;
}
export function lerp(out, v1, v2, t) {
out[0] = v1[0] + t * (v2[0] - v1[0]);
out[1] = v1[1] + t * (v2[1] - v1[1]);
return out;
}
export function applyTransform(out, v, m) {
var x = v[0];
var y = v[1];
out[0] = m[0] * x + m[2] * y + m[4];
out[1] = m[1] * x + m[3] * y + m[5];
return out;
}
export function min(out, v1, v2) {
out[0] = Math.min(v1[0], v2[0]);
out[1] = Math.min(v1[1], v2[1]);
return out;
}
export function max(out, v1, v2) {
out[0] = Math.max(v1[0], v2[0]);
out[1] = Math.max(v1[1], v2[1]);
return out;
}
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