let grid = null; const LIFE_SPAN = 500; const BRANCH_RATE = 0.01; const N_START = 700; const FULL_TIME = 2000; const NONE = 0; const LIVE = 1; const DEAD = 2; const PATH = 3; const FEED = 4; function setup() { frameRate(30); createCanvas(1408, 448); let d = 2; grid = new Grid(d); grid.setCore(); pixelDensity(1); }; function draw() { if (frameCount % FULL_TIME === 0) { grid = new Grid(grid.d); grid.setCore(); } let time = frameCount % FULL_TIME; background(0); noStroke(); for (let i = 0; i < grid.squares.length; i++) { for (let j = 0; j < grid.squares[i].length; j++) { let sq = grid.getSquare(i, j); if (sq.state === NONE) { continue; } if (sq.state === DEAD) { continue; } if (sq.state === FEED) { continue; } let alpha; if (time < 1000) { alpha = 255; } else { alpha = (FULL_TIME - 10 - time) / (FULL_TIME - 1000) * 255; } let c = color(red(sq.color), green(sq.color), blue(sq.color), alpha); fill(c); square(i * sq.d, j * sq.d, sq.d); } } //noLoop(); //let n = frameCount; //textSize(32); //fill(0); //text(n, 10, height - 20); grid.update(); }; function mousePressed() { //grid.update(); }; class Square { constructor(d, col, state = NONE, direction = 0, age = 0) { this.d = d; this.color = col || color(0, 0, 0); this.direction = direction; this.age = age; this.state = state; // "none", "live", "dead", "path", "feed" this.parent_sq = null; } } class Grid { constructor(d) { this.d = d; this.squares = []; this.nH = int(height / d); this.nW = int(width / d); for (let i = 0; i < this.nW; i++) { let row = []; for (let j = 0; j < this.nH; j++) { row.push(new Square(d)); } this.squares.push(row); } } setCore() { let colors = [ color(200, 200, 200), color(230, 230, 200), color(200, 230, 230), ]; for (let i = 0; i < N_START; i++) { let x = int(random(this.nW)); let y = int(random(this.nH)); let sq = this.getSquare(x, y); sq.color = random(colors); sq.direction = random(TWO_PI); sq.state = LIVE; } let totalCells = this.nW * this.nH; let feedCells = Math.floor(totalCells * 0.001); let noiseScale = 0.005; for (let count = 0; count < feedCells; count++) { let x, y; let attempts = 0; do { x = int(random(this.nW)); y = int(random(this.nH)); attempts++; } while (attempts < 100 && noise(x * noiseScale, y * noiseScale) < 0.5); if (x >= 0 && x < this.nW && y >= 0 && y < this.nH) { let sq = this.getSquare(x, y); sq.color = color(100, 255, 100); sq.direction = random(TWO_PI); sq.state = FEED; } } this.createU(this.nW / 4, this.nH / 2, 120); this.createN(this.nW * 3/4, this.nH / 2, 120); } createU(centerX, centerY, size) { let thickness = Math.max(2, Math.floor(size / 8)); // 線の太さ let width = Math.floor(size * 0.7); // U字の幅 let height = Math.floor(size * 0.8); // U字の高さ let radius = width / 2; // 下部の半円の半径 this.createRectangle(centerX - width/2 + thickness/2, centerY - radius/2, thickness, height - radius); this.createRectangle(centerX + width/2 - thickness/2, centerY - radius/2, thickness, height - radius); let semicircleY = centerY + height/2 - radius; this.createSemicircle(centerX, semicircleY, radius, radius - thickness, 0, PI); } createN(centerX, centerY, size) { let thickness = Math.max(2, Math.floor(size / 8)); // 線の太さ let width = Math.floor(size * 0.7); // N字の幅 let height = Math.floor(size * 0.8); // N字の高さ let radius = width / 2; // 上部の半円の半径 this.createRectangle(centerX - width/2 + thickness/2, centerY + radius/2, thickness, height - radius); this.createRectangle(centerX + width/2 - thickness/2, centerY + radius/2, thickness, height - radius); let semicircleY = centerY - height/2 + radius; this.createSemicircle(centerX, semicircleY, radius, radius - thickness, PI, TWO_PI); } createRectangle(centerX, centerY, width, height) { for (let x = centerX - width/2; x <= centerX + width/2; x++) { for (let y = centerY - height/2; y <= centerY + height/2; y++) { if (x >= 0 && x < this.nW && y >= 0 && y < this.nH) { let sq = this.getSquare(x, y); sq.color = color(100, 255, 100); sq.direction = random(TWO_PI); sq.state = FEED; } } } } createSemicircle(centerX, centerY, outerRadius, innerRadius, startAngle, endAngle) { for (let x = centerX - outerRadius; x <= centerX + outerRadius; x++) { for (let y = centerY - outerRadius; y <= centerY + outerRadius; y++) { let distance = dist(x, y, centerX, centerY); let angle = atan2(y - centerY, x - centerX); if (angle < 0) angle += TWO_PI; // 距離が内側と外側の半径の間にあり、指定された角度範囲内にある場合 if (distance <= outerRadius && distance >= innerRadius && angle >= startAngle && angle <= endAngle && x >= 0 && x < this.nW && y >= 0 && y < this.nH) { let sq = this.getSquare(x, y); sq.color = color(100, 255, 100); sq.direction = random(TWO_PI); sq.state = FEED; } } } } update() { let newStates = []; // あるていど疎。ゆるやかなカーブを描く let theta1 = PI / 4; let theta2 = PI / 4; for (let i = 0; i < this.squares.length; i++) { for (let j = 0; j < this.squares[i].length; j++) { let sq = this.getSquare(i, j); switch (sq.state) { case NONE: continue; case LIVE: let age = sq.age + 1; if (age > LIFE_SPAN) { if (this.hasChild(i, j)) { newStates.push({ i: i, j: j, state: PATH, color: sq.color, direction: sq.direction, parent_sq: sq.parent_sq, age: age }); } else { newStates.push({ i: i, j: j, state: DEAD, color: sq.color, direction: sq.direction, age: 0 }); } } else { let direction = sq.direction; if (random() < BRANCH_RATE) { let side = this.compareSides(i, j); if (side > 0) { direction = this.getLeftSideDirection(direction); } else if (side < 0) { direction = this.getRightSideDirection(direction); } else { direction += random(-theta2, theta2); } } newStates.push({ i: i, j: j, state: LIVE, color: sq.color, direction: direction, parent_sq: sq.parent_sq, age: age }); let count = this.getNeighborCount(i, j); if (count > 0 && count < 3) { let neighborCoord = this.getForwardNeighborCoord(i, j); if (neighborCoord) { let neighbor = this.getSquare(neighborCoord.x, neighborCoord.y); if (neighbor && neighbor.state === NONE) { let direction = sq.direction; newStates.push({ i: neighborCoord.x, j: neighborCoord.y, state: LIVE, color: sq.color, direction: sq.direction + random(-theta1, theta1), parent_sq: sq, age: 0 }); } if (neighbor && neighbor.state === FEED) { newStates.push({ i: neighborCoord.x, j: neighborCoord.y, state: FEED, color: neighbor.color, direction: sq.direction + random(-theta1, theta1), parent_sq: sq, age: 0 }); } } } } break; case PATH: if (this.hasChild(i, j)) { let hasFeedChild = false; for (let child of this.getChildren(i, j)) { if (child.state === FEED) { newStates.push({ i: i, j: j, state: FEED, color: child.color, direction: sq.direction, parent_sq: sq.parent_sq, age: 0 }); hasFeedChild = true; break; } } if (!hasFeedChild) { newStates.push({ i: i, j: j, state: PATH, color: sq.color, direction: sq.direction, parent_sq: sq.parent_sq, age: sq.age }); } } else { newStates.push({ i: i, j: j, state: DEAD, color: sq.color, direction: sq.direction, age: sq.age }); } break; case DEAD: if (random() < 0.1) { newStates.push({ i: i, j: j, state: LIVE, color: sq.color, direction: random(TWO_PI), age: 0 }); } else { newStates.push({ i: i, j: j, state: NONE, }); } break; case FEED: continue; default: console.error("Unknown state:", sq.state); } } } for (let state of newStates) { let sq = this.getSquare(state.i, state.j); sq.state = state.state; sq.color = state.color; sq.direction = state.direction; sq.age = state.age || 0; sq.parent_sq = state.parent_sq || null; } } getSquare(i, j) { return this.squares[i][j]; } getForwardNeighbor(i, j) { let sq = this.getSquare(i, j); let direction = sq.direction % TWO_PI; let n = floor(direction / (PI / 4)); if (n == 0) return this.getSquare(i + 1, j); if (n == 1) return this.getSquare(i + 1, j - 1); if (n == 2) return this.getSquare(i, j - 1); if (n == 3) return this.getSquare(i - 1, j - 1); if (n == 4) return this.getSquare(i - 1, j); if (n == 5) return this.getSquare(i - 1, j + 1); if (n == 6) return this.getSquare(i, j + 1); if (n == 7) return this.getSquare(i + 1, j + 1); } getForwardNeighborCoord(i, j) { let sq = this.getSquare(i, j); let direction = (sq.direction % TWO_PI + TWO_PI) % TWO_PI; let n = floor(direction / (PI / 4)); let x, y; if (n == 0) { x = i + 1; y = j; } else if (n == 1) { x = i + 1; y = j - 1; } else if (n == 2) { x = i; y = j - 1; } else if (n == 3) { x = i - 1; y = j - 1; } else if (n == 4) { x = i - 1; y = j; } else if (n == 5) { x = i - 1; y = j + 1; } else if (n == 6) { x = i; y = j + 1; } else if (n == 7) { x = i + 1; y = j + 1; } if (x < 0 || x >= this.nW || y < 0 || y >= this.nH) return null; return { x: x, y: y }; } getNeighborCount(i, j) { let count = 0; let neighbors = this.getNeighbors(i, j); for (let n of neighbors) { if (n.state === LIVE) count++; } return count; } getNeighbors(i, j) { let neighbors = []; for (let di = -1; di <= 1; di++) { for (let dj = -1; dj <= 1; dj++) { if (di === 0 && dj === 0) continue; if (i + di < 0 || i + di >= this.nW || j + dj < 0 || j + dj >= this.nH) continue; neighbors.push(this.getSquare(i + di, j + dj)); } } return neighbors; } hasChild(i, j) { let neighbors = this.getNeighbors(i, j); for (let n of neighbors) { if (n.parent_sq && n.parent_sq === this.getSquare(i, j) && n.state !== DEAD && n.state !== NONE) { return true; } } return false; } getChildren(i, j) { let children = []; let neighbors = this.getNeighbors(i, j); for (let n of neighbors) { if (n.parent_sq && n.parent_sq === this.getSquare(i, j) && n.state !== DEAD && n.state !== NONE) { children.push(n); } } return children; } getRightSideDirection(direction) { return (direction + PI / 2) % TWO_PI; } getLeftSideDirection(direction) { return (direction - PI / 2 + TWO_PI) % TWO_PI; } getSideNeighbors(i, j, direction, isRight) { let sideDirection = isRight ? this.getRightSideDirection(direction) : this.getLeftSideDirection(direction); let neighbors = []; // 3つの角度範囲をチェック（前方、横、斜め後方） for (let angleOffset of [-PI/4, 0, PI/4]) { let checkDirection = (sideDirection + angleOffset + TWO_PI) % TWO_PI; let n = floor(checkDirection / (PI / 4)); let x, y; if (n == 0) { x = i + 1; y = j; } else if (n == 1) { x = i + 1; y = j - 1; } else if (n == 2) { x = i; y = j - 1; } else if (n == 3) { x = i - 1; y = j - 1; } else if (n == 4) { x = i - 1; y = j; } else if (n == 5) { x = i - 1; y = j + 1; } else if (n == 6) { x = i; y = j + 1; } else if (n == 7) { x = i + 1; y = j + 1; } if (x >= 0 && x < this.nW && y >= 0 && y < this.nH) { neighbors.push(this.getSquare(x, y)); } } return neighbors; } compareSides(i, j) { let sq = this.getSquare(i, j); let direction = sq.direction; let rightNeighbors = this.getSideNeighbors(i, j, direction, true); let leftNeighbors = this.getSideNeighbors(i, j, direction, false); let rightCount = 0; let leftCount = 0; for (let neighbor of rightNeighbors) { if (neighbor.state === LIVE || neighbor.state === PATH) { rightCount++; } } for (let neighbor of leftNeighbors) { if (neighbor.state === LIVE || neighbor.state === PATH) { leftCount++; } } // 右側が多い場合は1、左側が多い場合は-1、同じ場合は0を返す if (rightCount > leftCount) return 1; if (leftCount > rightCount) return -1; return 0; } }

slime mold in a grid