1 files changed, 139 insertions, 0 deletions

diff --git a/docs/js/ValueMap.js b/docs/js/ValueMap.js
new file mode 100644
index 000000000..31ddba27e
--- /dev/null
+++ b/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();
+	}
+}