Files
havox/projects/marching_squares.html
2026-03-16 18:03:17 +00:00

174 lines
6.3 KiB
HTML
Executable File

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0>
<script src="https://cdn.jsdelivr.net/npm/p5@1.4.0/lib/p5.min.js"></script>
</head>
<script>
var reso = 50;
var cols, rows;
var field = [];
var draw_lines = true;
function setup() {
createCanvas(800, 600);
cols = width / reso + 1;
rows = height / reso + 1;
for (var i = 0; i < cols * rows; i++)
field[i] = Math.floor(random(2));
}
function draw() {
background(100);
const cBlue = color(55, 120, 232);
const cGreen = color(146, 232, 55);
for (var i = 0; i < cols * rows; i++){
let x = i % cols;
let y = Math.floor(i / cols);
let c = field[i] ? cBlue : cGreen;
fill(c);
rect(x*reso - reso*0.5, y*reso - reso*0.5, reso, reso);
}
for (var i = 0; i < cols * rows; i++) {
if (i + cols + 1 > cols * rows){break;}
var x = (i % cols) * reso;
var y = (Math.floor(i / cols)) * reso;
const a = [x + reso * 0.5, y ];
const b = [x + reso, y + reso * 0.5];
const c = [x + reso * 0.5, y + reso ];
const d = [x, y + reso * 0.5];
var s = getState(field[i], field[i+1], field[i+cols+1], field[i+cols]);
noStroke();
switch(s) {
case 1:
fill(cGreen);
triangle(x + reso*0.5, y + reso*0.5, c[0], c[1], d[0], d[1]);
break;
case 14:
fill(cBlue);
triangle(x + reso*0.5, y + reso*0.5, c[0], c[1], d[0], d[1]);
break;
case 2:
fill(cGreen);
triangle(x + reso*0.5, y + reso*0.5, b[0], b[1], c[0], c[1]);
break;
case 13:
fill(cBlue);
triangle(x + reso*0.5, y + reso*0.5, b[0], b[1], c[0], c[1]);
break;
case 3:
fill(cBlue);
rect(d[0], d[1], reso, reso*0.5);
break;
case 12:
fill(cGreen);
rect(d[0], d[1], reso, reso*0.5);
break;
case 4:
fill(cGreen);
triangle(x + reso*0.5, y + reso*0.5, a[0], a[1], b[0], b[1]);
break;
case 11:
fill(cBlue);
triangle(x + reso*0.5, y + reso*0.5, a[0], a[1], b[0], b[1]);
break;
case 5:
fill(cBlue);
triangle(x + reso*0.5, y + reso*0.5, a[0], a[1], d[0], d[1]);
triangle(x + reso*0.5, y + reso*0.5, b[0], b[1], c[0], c[1]);
break;
case 6:
fill(cBlue);
rect(a[0], a[1], reso*0.5, reso);
break;
case 9:
fill(cGreen);
rect(a[0], a[1], reso*0.5, reso);
break;
case 7:
fill(cBlue);
triangle(x + reso*0.5, y + reso*0.5, a[0], a[1], d[0], d[1]);
break;
case 8:
fill(cGreen);
triangle(x + reso*0.5, y + reso*0.5, a[0], a[1], d[0], d[1]);
break;
case 10:
fill(cBlue);
triangle(x + reso*0.5, y + reso*0.5, a[0], a[1], b[0], b[1]);
triangle(x + reso*0.5, y + reso*0.5, c[0], c[1], d[0], d[1]);
break;
default:
break;
};
if (draw_lines) { drawLines(s, a, b, c, d); }
}
}
function getState(a,b,c,d){
return d * 1 + c * 2 + b * 4 + a * 8;
}
function drawLines(s, a, b, c, d){
stroke(232,229,55);
strokeWeight(reso * 0.1);
switch(s) {
case 1: case 14:
line(c[0], c[1], d[0], d[1]);
break;
case 2: case 13:
line(b[0], b[1], c[0], c[1]);
break;
case 3: case 12:
line(b[0], b[1], d[0], d[1]);
break;
case 4: case 11:
line(a[0], a[1], b[0], b[1]);
break;
case 5:
line(a[0], a[1], d[0], d[1]);
line(b[0], b[1], c[0], c[1]);
break;
case 6: case 9:
line(a[0], a[1], c[0], c[1]);
break;
case 7: case 8:
line(a[0], a[1], d[0], d[1]);
break;
case 10:
line(a[0], a[1], b[0], b[1]);
line(c[0], c[1], d[0], d[1]);
break;
default:
break;
};
noStroke();
}
function mousePressed(){
if (mouseButton == LEFT){
var x = Math.floor((mouseX + 0.5*reso) / reso);
var y = Math.floor((mouseY + 0.5*reso) / reso);
var i = Math.floor(y * cols + x);
field[i] = (field[i] + 1) % 2;
} else if (mouseButton == RIGHT){
draw_lines = !draw_lines;
}
}
</script>
</html>