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// A utility library for vector (coordinate) operations.
exports.mult = function(vec, scal){
for (let i = 0; i < vec.length; i++)
vec[i] = scal*vec[i];
return vec;
}
exports.elem = function(orig, vec, op){
if (orig.length > vec.length) throw "Vector length mismatch";
if (orig.length && isNaN(orig[0])) throw "orig vec has a NaN";
if (vec.length && isNaN(vec[0])) throw "new vec has a NaN";
let comb = [];
for (let i = 0; i < orig.length; i++){
comb.push(op(vec[i],orig[i]));
}
return comb;
}
exports.equals = function(orig, vec){
for (let i = 0; i < orig.length; i++){
if (orig[i] != vec[i]) return false;
}
return true;
}
exports.add = function(orig, vec){
return exports.elem(orig, vec, (a,b) => a+b);
}
exports.sub = function(orig, vec){
return exports.elem(orig, vec, (a,b) => a-b);
}
exports.dot = function(orig,vec){
return exports.elem(orig, vec, (a,b) => a*b);
}
exports.tileToChar = function(orig){
return exports.dot(orig, [8,16]);
}
exports.charToTile = function(orig){
return exports.dot(orig, [1/8, 1/16]).map(a => Math.floor(a));
}
exports.norm = function(orig){
let sum = orig.reduce( (acc, cur) => acc+cur );
return exports.dot(orig, 1/sum);
}
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