summaryrefslogtreecommitdiffstats
path: root/dev-docs/js/ValueMap.js
diff options
context:
space:
mode:
authorWilliam 'psyFi' Hatcher <william@hatcher.work>2017-08-13 13:32:12 +0200
committerTiger Wang <ziwei.tiger@outlook.com>2017-08-13 13:32:12 +0200
commit0cd8482f07aadab6de27aa7395de5408737093ad (patch)
treef6809d1a12db5ed885a98f260bdf95a21e3c2343 /dev-docs/js/ValueMap.js
parentReplaced includes with forward declarations (diff)
downloadcuberite-0cd8482f07aadab6de27aa7395de5408737093ad.tar
cuberite-0cd8482f07aadab6de27aa7395de5408737093ad.tar.gz
cuberite-0cd8482f07aadab6de27aa7395de5408737093ad.tar.bz2
cuberite-0cd8482f07aadab6de27aa7395de5408737093ad.tar.lz
cuberite-0cd8482f07aadab6de27aa7395de5408737093ad.tar.xz
cuberite-0cd8482f07aadab6de27aa7395de5408737093ad.tar.zst
cuberite-0cd8482f07aadab6de27aa7395de5408737093ad.zip
Diffstat (limited to 'dev-docs/js/ValueMap.js')
-rw-r--r--dev-docs/js/ValueMap.js139
1 files changed, 139 insertions, 0 deletions
diff --git a/dev-docs/js/ValueMap.js b/dev-docs/js/ValueMap.js
new file mode 100644
index 000000000..31ddba27e
--- /dev/null
+++ b/dev-docs/js/ValueMap.js
@@ -0,0 +1,139 @@
+
+const g_DistanceBetweenSquares = 0;//.01;
+const g_Colors = [
+ "#0000FF",
+ "#00FF00",
+ "#FF0000",
+ "#FF00FF",
+ "#00FFFF",
+ "#FFFF00",
+ "#000000",
+ "#9BADFF"
+]
+
+class ValueMap {
+ constructor() {
+ this.values = new Uint8Array(4 * 4);
+ this.sizeX = 4;
+ this.sizeZ = 4;
+ this.reset();
+ }
+
+
+ reset() {
+ this.sizeX = 4;
+ this.sizeZ = 4;
+ this.values = new Uint8Array(this.sizeX * this.sizeZ);
+
+ for (let x = 0; x < this.sizeX; x++)
+ {
+ for (let z = 0; z < this.sizeZ; z++)
+ {
+ this.values[x + this.sizeZ * z] = Math.floor(Math.random() * 8);
+ }
+ }
+ }
+
+
+ chooseRandomNumber() {
+ let numArguments = arguments.length;
+ return arguments[Math.floor(Math.random() * arguments.length)];
+ }
+
+
+ smooth() {
+ let sizeZ = this.sizeZ - 2;
+ let sizeX = this.sizeX - 2;
+ let cache = new Uint8Array((this.sizeX - 2) * (this.sizeZ - 2));
+ for (let z = 0; z < sizeZ; z++)
+ {
+ for (let x = 0; x < sizeX; x++)
+ {
+ let val = this.values[x + 1 + (z + 1) * this.sizeX];
+ let above = this.values[x + 1 + z * this.sizeX];
+ let below = this.values[x + 1 + (z + 2) * this.sizeX];
+ let left = this.values[x + (z + 1) * this.sizeX];
+ let right = this.values[x + 2 + (z + 1) * this.sizeX];
+
+ if ((left == right) && (above == below))
+ {
+ if (Math.random() < 0.5)
+ {
+ val = left;
+ }
+ else
+ {
+ val = below;
+ }
+ }
+ else
+ {
+ if (left == right)
+ {
+ val = left;
+ }
+ if (above == below)
+ {
+ val = above;
+ }
+ }
+ cache[x + z * sizeX] = val;
+ }
+ }
+ this.values = cache;
+ this.sizeX -= 2;
+ this.sizeZ -= 2;
+ }
+
+
+ zoom() {
+ let lowStepX = (this.sizeX - 1) * 2;
+ let lowStepZ = (this.sizeZ - 1) * 2;
+ let cache = new Uint8Array(lowStepX * lowStepZ);
+ for (let z = 0; z < this.sizeZ - 1; z++)
+ {
+ let idx = (z * 2) * lowStepX;
+ let PrevZ0 = this.values[z * this.sizeX];
+ let PrevZ1 = this.values[(z + 1) * this.sizeX];
+
+ for (let x = 0; x < this.sizeX - 1; x++)
+ {
+ let ValX1Z0 = this.values[x + 1 + z * this.sizeX];
+ let ValX1Z1 = this.values[x + 1 + (z + 1) * this.sizeX];
+ cache[idx] = PrevZ0;
+ cache[idx + lowStepX] = this.chooseRandomNumber(PrevZ0, PrevZ1);
+ cache[idx + 1] = this.chooseRandomNumber(PrevZ0, ValX1Z0);
+ cache[idx + 1 + lowStepX] = this.chooseRandomNumber(PrevZ0, ValX1Z0, PrevZ1, ValX1Z1);
+ idx += 2;
+ PrevZ0 = ValX1Z0;
+ PrevZ1 = ValX1Z1;
+ }
+ }
+ this.values = cache;
+ this.sizeX = lowStepX;
+ this.sizeZ = lowStepZ;
+ }
+
+
+ visualize(context, canvas) {
+ context.clearRect(0, 0, canvas.width, canvas.height);
+ const squareSizeX = canvas.width / (this.sizeX - 1) - g_DistanceBetweenSquares;
+ const squareSizeY = canvas.height / (this.sizeZ - 1) - g_DistanceBetweenSquares;
+ for (let x = 0; x < this.sizeX - 1; x++)
+ {
+ for (let y = 0; y < this.sizeZ - 1; y++)
+ {
+ let renderX = canvas.width / (this.sizeX - 1) * x + g_DistanceBetweenSquares;
+ let renderY = canvas.height / (this.sizeZ - 1) * y + g_DistanceBetweenSquares;
+ context.fillStyle = g_Colors[this.values[x + y * this.sizeZ]];
+ context.fillRect(renderX, renderY, squareSizeX, squareSizeY);
+ }
+ }
+
+ context.save();
+ context.globalCompositeOperation = 'difference';
+ context.fillStyle = 'white';
+ context.fillText("Size: " + (this.sizeX - 1) + "x" + (this.sizeZ - 1), 5, 10);
+ context.restore();
+ }
+}