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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();
}
}
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