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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,4 @@ | ||
| #root { | ||
| margin: 0 auto; | ||
| overflow-x: hidden; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,209 @@ | ||
| import React, { useState, useEffect } from 'react' | ||
| import { Container, Graphics, useApp, useTick } from '@pixi/react' | ||
| import * as PIXI from 'pixi.js' | ||
| import { ACCENT_COLOR } from '../constants' | ||
|
|
||
| interface Vector { | ||
| x: number | ||
| y: number | ||
| } | ||
|
|
||
| interface Boid { | ||
| position: Vector | ||
| velocity: Vector | ||
| } | ||
|
|
||
| const BOID_COUNT = 50 | ||
| const VIEW_RADIUS = 50 | ||
| const MAX_SPEED = 5 | ||
| const SEPARATION_DISTANCE = 50 | ||
| const ALIGNMENT_RADIUS = 50 | ||
| const COHESION_RADIUS = 50 | ||
| const BOID_SIZE = 10 | ||
|
|
||
| const Boids: React.FC = () => { | ||
| const [boids, setBoids] = useState<Boid[]>([]) | ||
|
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| const app = useApp() | ||
|
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||
| const stageMargin = 50 | ||
|
|
||
| useEffect(() => { | ||
| const initialBoids: Boid[] = new Array(BOID_COUNT).fill(null).map(() => ({ | ||
| position: { | ||
| x: Math.random() * app.screen.width, | ||
| y: Math.random() * app.screen.height, | ||
| }, | ||
| velocity: { | ||
| x: Math.random() * MAX_SPEED - MAX_SPEED / 2, | ||
| y: Math.random() * MAX_SPEED - MAX_SPEED / 2, | ||
| }, | ||
| })) | ||
|
|
||
| setBoids(initialBoids) | ||
| }, []) | ||
|
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||
| const addVectors = (v1: Vector, v2: Vector): Vector => ({ | ||
| x: v1.x + v2.x, | ||
| y: v1.y + v2.y, | ||
| }) | ||
|
|
||
| const multiplyVector = (v: Vector, scalar: number): Vector => ({ | ||
| x: v.x * scalar, | ||
| y: v.y * scalar, | ||
| }) | ||
|
|
||
| const limitVector = (v: Vector, max: number): Vector => { | ||
| const magnitude = Math.sqrt(v.x * v.x + v.y * v.y) | ||
| if (magnitude > max) { | ||
| return multiplyVector(v, max / magnitude) | ||
| } | ||
| return v | ||
| } | ||
|
|
||
| const separation = (boid: Boid, neighbors: Boid[]): Vector => { | ||
| let steer: Vector = { x: 0, y: 0 } | ||
| let total = 0 | ||
| neighbors.forEach((other) => { | ||
| const distance = Math.sqrt( | ||
| Math.pow(boid.position.x - other.position.x, 2) + | ||
| Math.pow(boid.position.y - other.position.y, 2) | ||
| ) | ||
| if (distance < SEPARATION_DISTANCE && distance > 0) { | ||
| const diff: Vector = { | ||
| x: boid.position.x - other.position.x, | ||
| y: boid.position.y - other.position.y, | ||
| } | ||
| steer = addVectors(steer, diff) | ||
| total++ | ||
| } | ||
| }) | ||
| if (total > 0) { | ||
| steer = multiplyVector(steer, 1 / total) | ||
| } | ||
| return steer | ||
| } | ||
|
|
||
| const alignment = (boid: Boid, neighbors: Boid[]): Vector => { | ||
| let averageVel: Vector = { x: 0, y: 0 } | ||
| neighbors.forEach((other) => { | ||
| averageVel = addVectors(averageVel, other.velocity) | ||
| }) | ||
| if (neighbors.length > 0) { | ||
| averageVel = multiplyVector(averageVel, 1 / neighbors.length) | ||
| return limitVector(averageVel, MAX_SPEED) | ||
| } | ||
| return boid.velocity | ||
| } | ||
|
|
||
| const cohesion = (boid: Boid, neighbors: Boid[]): Vector => { | ||
| let centerOfMass: Vector = { x: 0, y: 0 } | ||
| neighbors.forEach((other) => { | ||
| centerOfMass = addVectors(centerOfMass, other.position) | ||
| }) | ||
| if (neighbors.length > 0) { | ||
| centerOfMass = multiplyVector(centerOfMass, 1 / neighbors.length) | ||
| return { | ||
| x: centerOfMass.x - boid.position.x, | ||
| y: centerOfMass.y - boid.position.y, | ||
| } | ||
| } | ||
| return { x: 0, y: 0 } | ||
| } | ||
|
|
||
| const getNeighbors = (boid: Boid, radius: number): Boid[] => { | ||
| return boids.filter((other) => { | ||
| const distance = Math.sqrt( | ||
| Math.pow(boid.position.x - other.position.x, 2) + | ||
| Math.pow(boid.position.y - other.position.y, 2) | ||
| ) | ||
| return distance < radius && distance > 0 | ||
| }) | ||
| } | ||
|
|
||
| useTick((delta) => { | ||
| const newBoids = boids.map((boid) => { | ||
| const neighbors = getNeighbors(boid, VIEW_RADIUS) | ||
|
|
||
| // Apply behaviors | ||
| const sep = separation(boid, getNeighbors(boid, SEPARATION_DISTANCE)) | ||
| const ali = alignment(boid, getNeighbors(boid, ALIGNMENT_RADIUS)) | ||
| const coh = cohesion(boid, getNeighbors(boid, COHESION_RADIUS)) | ||
|
|
||
| // Adjust velocity | ||
| boid.velocity = addVectors(boid.velocity, sep) | ||
| boid.velocity = addVectors(boid.velocity, ali) | ||
| boid.velocity = addVectors(boid.velocity, coh) | ||
| boid.velocity = limitVector(boid.velocity, MAX_SPEED) | ||
|
|
||
| // Update position and apply wrap-around | ||
| const newPosition = { | ||
| x: boid.position.x + boid.velocity.x * delta, | ||
| y: boid.position.y + boid.velocity.y * delta, | ||
| } | ||
|
|
||
| // Wrap-around logic for x-coordinate | ||
| if (newPosition.x < -stageMargin) { | ||
| newPosition.x = app.screen.width + stageMargin | ||
| } else if (newPosition.x > app.screen.width + stageMargin) { | ||
| newPosition.x = -stageMargin | ||
| } | ||
|
|
||
| // Wrap-around logic for y-coordinate | ||
| if (newPosition.y < -stageMargin) { | ||
| newPosition.y = app.screen.height + stageMargin | ||
| } else if (newPosition.y > app.screen.height + stageMargin) { | ||
| newPosition.y = -stageMargin | ||
| } | ||
|
|
||
| return { | ||
| ...boid, | ||
| position: newPosition, | ||
| } | ||
| }) | ||
|
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| setBoids(newBoids) | ||
| }) | ||
|
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||
| const drawTriangle = ( | ||
| g: PIXI.Graphics, | ||
| x: number, | ||
| y: number, | ||
| size: number, | ||
| rotation: number | ||
| ) => { | ||
| g.drawPolygon([ | ||
| x - size, | ||
| y + size, // Left corner | ||
| x + size, | ||
| y + size, // Right corner | ||
| x, | ||
| y - size, // Top corner | ||
| ]) | ||
| g.rotation = rotation | ||
| } | ||
|
|
||
| const color = new PIXI.Color(ACCENT_COLOR) | ||
|
|
||
| return ( | ||
| <Container> | ||
| {boids.map((boid, index) => ( | ||
| <Graphics | ||
| key={index} | ||
| draw={(g) => { | ||
| g.clear() | ||
| g.beginFill(color) // Purple color | ||
| const rotation = | ||
| Math.atan2(boid.velocity.y, boid.velocity.x) + Math.PI / 2 | ||
| drawTriangle(g, 0, 0, BOID_SIZE, rotation) // Draw each boid as a triangle | ||
| g.endFill() | ||
| }} | ||
| x={boid.position.x} | ||
| y={boid.position.y} | ||
| /> | ||
| ))} | ||
| </Container> | ||
| ) | ||
| } | ||
|
|
||
| export default Boids | ||
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