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use an es6 class for diamond_square generation

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Romain Beaumont 2015-10-26 02:03:32 +01:00
parent 1a58da904c
commit 53c2bc776d
1 changed files with 39 additions and 46 deletions
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85
src/lib/worldGenerations/diamond_square.js
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@ -2,58 +2,51 @@ var Chunk = require('prismarine-chunk')(require("../version"));
var Vec3 = require('vec3'); var Vec3 = require('vec3');
var rand = require('random-seed'); var rand = require('random-seed');
function DiamondSquare(size, roughness, seed) { class DiamondSquare {
// public fields constructor(size, roughness, seed) {
this.size = size; // public fields
this.roughness = roughness; this.size = size;
this.seed = seed; this.roughness = roughness;
var opCount = 0; this.seed = seed;
this.opCountN = 0;
// private field // private field
var data = []; this.data = [];
}
// public methods // public methods
this.value = function(x, y, v) { value(x, y, v) {
x = parseInt(x); x = parseInt(x);
y = parseInt(y); y = parseInt(y);
if (typeof(v) != 'undefined') if (typeof(v) != 'undefined')
val(x, y, v); this.val(x, y, v);
else else
return val(x, y); return this.val(x, y);
};
this.clear = function() {
data = [];
};
this.opCount = function(v) {
if (typeof(v) != 'undefined')
opCount = v;
else
return opCount;
}; };
// private methods // private methods
function val(x, y, v) { val(x, y, v) {
if (typeof(v) != 'undefined') if (typeof(v) != 'undefined')
data[x + '_' + y] = Math.max(0.0, Math.min(1.0, v)); this.data[x + '_' + y] = Math.max(0.0, Math.min(1.0, v));
else { else {
if (x <= 0 || x >= size || y <= 0 || y >= size) return 0.0; if (x <= 0 || x >= this.size || y <= 0 || y >= this.size) return 0.0;
if (data[x + '_' + y] == null) { if (this.data[x + '_' + y] == null) {
opCount++; this.opCountN++;
var base = 1; var base = 1;
while (((x & base) == 0) && ((y & base) == 0)) while (((x & base) == 0) && ((y & base) == 0))
base <<= 1; base <<= 1;
if (((x & base) != 0) && ((y & base) != 0)) if (((x & base) != 0) && ((y & base) != 0))
squareStep(x, y, base); this.squareStep(x, y, base);
else else
diamondStep(x, y, base); this.diamondStep(x, y, base);
} }
return data[x + '_' + y]; return this.data[x + '_' + y];
} }
} }
function randFromPair(x, y) { randFromPair(x, y) {
for (var i = 0; i < 80; i++) { for (var i = 0; i < 80; i++) {
var xm7 = x % 7; var xm7 = x % 7;
var xm13 = x % 13; var xm13 = x % 13;
@ -62,34 +55,34 @@ function DiamondSquare(size, roughness, seed) {
var ym105467 = y % 105467; var ym105467 = y % 105467;
var ym105943 = y % 105943; var ym105943 = y % 105943;
//y = (i < 40 ? seed : x); //y = (i < 40 ? seed : x);
y = x + seed; y = x + this.seed;
x += (xm7 + xm13 + xm1301081 + ym8461 + ym105467 + ym105943); x += (xm7 + xm13 + xm1301081 + ym8461 + ym105467 + ym105943);
} }
return (xm7 + xm13 + xm1301081 + ym8461 + ym105467 + ym105943) / 1520972.0; return (xm7 + xm13 + xm1301081 + ym8461 + ym105467 + ym105943) / 1520972.0;
} }
function displace(v, blockSize, x, y) { displace(v, blockSize, x, y) {
return (v + (randFromPair(x, y, seed) - 0.5) * blockSize * 2 / size * roughness); return (v + (this.randFromPair(x, y, this.seed) - 0.5) * blockSize * 2 / this.size * this.roughness);
} }
function squareStep(x, y, blockSize) { squareStep(x, y, blockSize) {
if (data[x + '_' + y] == null) { if (this.data[x + '_' + y] == null) {
val(x, y, this.val(x, y,
displace((val(x - blockSize, y - blockSize) + this.displace((this.val(x - blockSize, y - blockSize) +
val(x + blockSize, y - blockSize) + this.val(x + blockSize, y - blockSize) +
val(x - blockSize, y + blockSize) + this.val(x - blockSize, y + blockSize) +
val(x + blockSize, y + blockSize)) / 4, blockSize, x, y)); this.val(x + blockSize, y + blockSize)) / 4, blockSize, x, y));
} }
} }
function diamondStep(x, y, blockSize) { diamondStep(x, y, blockSize) {
if (data[x + '_' + y] == null) { if (this.data[x + '_' + y] == null) {
val(x, y, this.val(x, y,
displace((val(x - blockSize, y) + this.displace((this.val(x - blockSize, y) +
val(x + blockSize, y) + this.val(x + blockSize, y) +
val(x, y - blockSize) + this.val(x, y - blockSize) +
val(x, y + blockSize)) / 4, blockSize, x, y)); this.val(x, y + blockSize)) / 4, blockSize, x, y));
} }
} }
} }