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import streamlit as st |
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import streamlit.components.v1 as components |
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st.set_page_config(page_title="City Evolution Simulator", layout="wide") |
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st.title("City Evolution Simulator") |
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st.write("Watch a 3D city grow with lakes, hills, and evolving blocks") |
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html_code = """ |
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<!DOCTYPE html> |
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<html> |
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<head> |
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<meta charset="utf-8"> |
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<title>City Evolution Simulator</title> |
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<style> |
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body { margin: 0; overflow: hidden; } |
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canvas { width: 100%; height: 100%; display: block; } |
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.ui-panel { |
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position: absolute; |
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top: 10px; |
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right: 10px; |
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background: rgba(0,0,0,0.7); |
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padding: 15px; |
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border-radius: 5px; |
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color: white; |
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font-family: Arial, sans-serif; |
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z-index: 1000; |
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} |
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.ui-panel button { |
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margin: 5px 0; |
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padding: 5px 10px; |
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width: 100%; |
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background: #4CAF50; |
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color: white; |
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border: none; |
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border-radius: 3px; |
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cursor: pointer; |
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} |
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.ui-panel button:hover { background: #45a049; } |
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</style> |
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</head> |
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<body> |
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<div class="ui-panel"> |
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<h3>City Controls</h3> |
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<button id="evolve">Evolve City</button> |
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<button id="reset">Reset View</button> |
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<div id="stats"> |
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<p>Buildings: <span id="building-count">0</span></p> |
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<p>Blocks: <span id="block-count">0</span></p> |
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<p>Generation: <span id="generation">0</span></p> |
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</div> |
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</div> |
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<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r134/three.min.js"></script> |
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<script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/controls/OrbitControls.js"></script> |
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<script> |
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class BuildingLSystem { |
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constructor() { |
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this.axiom = "F"; |
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this.rules = { |
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"F": ["F[+F]", "F[-F]", "FF", "F"], |
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"+": ["+"], |
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"-": ["-"], |
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"[": ["["], |
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"]": ["]"] |
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}; |
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this.angle = Math.PI / 6; |
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} |
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generate() { |
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let result = this.axiom; |
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for (let i = 0; i < 2; i++) { |
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let newString = ""; |
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for (let char of result) { |
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if (this.rules[char]) { |
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const possible = this.rules[char]; |
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newString += possible[Math.floor(Math.random() * possible.length)]; |
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} else { |
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newString += char; |
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} |
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} |
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result = newString; |
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} |
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return result; |
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} |
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build(scene, basePos, maxHeight) { |
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let height = 0; |
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const stack = []; |
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let position = basePos.clone(); |
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let direction = new THREE.Vector3(0, 1, 0); |
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const structure = new THREE.Group(); |
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for (let char of this.generate()) { |
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switch(char) { |
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case 'F': |
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if (height < maxHeight) { |
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const width = 0.8 + Math.random() * 0.4; |
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const floorHeight = 1 + Math.random() * 2; |
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const geo = new THREE.BoxGeometry(width, floorHeight, width); |
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const mat = new THREE.MeshPhongMaterial({ |
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color: new THREE.Color(0.5 + Math.random() * 0.5, |
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0.5 + Math.random() * 0.5, |
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0.5 + Math.random() * 0.5) |
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}); |
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const floor = new THREE.Mesh(geo, mat); |
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floor.position.copy(position).add(new THREE.Vector3(0, floorHeight/2, 0)); |
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structure.add(floor); |
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position.y += floorHeight; |
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height += floorHeight; |
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} |
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break; |
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case '+': |
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direction.applyAxisAngle(new THREE.Vector3(0, 0, 1), this.angle); |
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break; |
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case '-': |
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direction.applyAxisAngle(new THREE.Vector3(0, 0, 1), -this.angle); |
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break; |
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case '[': |
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stack.push(position.clone()); |
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break; |
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case ']': |
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if (stack.length > 0) position = stack.pop(); |
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break; |
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} |
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} |
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return structure; |
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} |
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} |
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class CitySimulator { |
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constructor() { |
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this.blocks = []; |
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this.blockSize = 10; // 10x10 units per block |
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this.maxBuildingsPerBlock = 5; |
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this.generation = 0; |
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this.lakeCenters = [ |
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new THREE.Vector2(20, 20), |
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new THREE.Vector2(-30, 10) |
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]; |
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} |
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addBlock(scene, x, z) { |
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const block = { |
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position: new THREE.Vector2(x, z), |
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buildings: [], |
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maxHeight: this.isWaterfront(x, z) ? 15 : 8 |
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}; |
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this.blocks.push(block); |
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this.evolveBlock(scene, block, true); |
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} |
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isWaterfront(x, z) { |
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const pos = new THREE.Vector2(x, z); |
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return this.lakeCenters.some(center => |
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pos.distanceTo(center) < 15 && pos.distanceTo(center) > 5); |
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} |
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evolveBlock(scene, block, initial = false) { |
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if (block.buildings.length < this.maxBuildingsPerBlock) { |
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const lsystem = new BuildingLSystem(); |
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const gridX = Math.floor(Math.random() * 3) - 1; |
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const gridZ = Math.floor(Math.random() * 3) - 1; |
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const basePos = new THREE.Vector3( |
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block.position.x + gridX * 2, |
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this.getTerrainHeight(block.position.x, block.position.y), |
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block.position.y + gridZ * 2 |
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); |
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const building = lsystem.build(scene, basePos, block.maxHeight); |
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if (this.isWaterfront(block.position.x, block.position.y)) { |
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building.scale.set(1.5, 2, 1.5); // Lavish waterfront buildings |
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} |
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scene.add(building); |
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block.buildings.push(building); |
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} |
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} |
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evolve() { |
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this.generation++; |
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if (this.blocks.length < 20) { |
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const x = (Math.random() - 0.5) * 140; |
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const z = (Math.random() - 0.5) * 80; |
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if (!this.isInLake(x, z)) this.addBlock(scene, x, z); |
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} |
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this.blocks.forEach(block => this.evolveBlock(scene, block)); |
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this.updateStats(); |
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} |
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getTerrainHeight(x, z) { |
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return Math.sin(x * 0.05) * Math.cos(z * 0.05) * 5; |
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} |
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isInLake(x, z) { |
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const pos = new THREE.Vector2(x, z); |
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return this.lakeCenters.some(center => pos.distanceTo(center) < 10); |
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} |
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updateStats() { |
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const totalBuildings = this.blocks.reduce((sum, block) => sum + block.buildings.length, 0); |
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document.getElementById('building-count').textContent = totalBuildings; |
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document.getElementById('block-count').textContent = this.blocks.length; |
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document.getElementById('generation').textContent = this.generation; |
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} |
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} |
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let scene, camera, renderer, controls; |
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let city; |
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function init() { |
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const container = document.body; |
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scene = new THREE.Scene(); |
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scene.background = new THREE.Color(0x87CEEB); |
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// Camera with 16:9 aspect ratio |
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camera = new THREE.PerspectiveCamera(75, 16 / 9, 0.1, 1000); |
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camera.position.set(0, 50, 80); |
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renderer = new THREE.WebGLRenderer({ antialias: true }); |
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renderer.setSize(window.innerWidth, window.innerHeight * (9/16)); |
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container.appendChild(renderer.domElement); |
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// Lights |
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scene.add(new THREE.AmbientLight(0x404040)); |
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const sun = new THREE.DirectionalLight(0xffffff, 0.8); |
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sun.position.set(50, 50, 50); |
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scene.add(sun); |
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// Terrain and Lakes |
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const groundGeo = new THREE.PlaneGeometry(160, 90, 32, 32); |
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const groundMat = new THREE.MeshPhongMaterial({ color: 0x4a7043 }); |
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const ground = new THREE.Mesh(groundGeo, groundMat); |
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ground.rotation.x = -Math.PI / 2; |
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ground.position.y = -0.1; |
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scene.add(ground); |
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// Add lakes |
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const lakeGeo = new THREE.CircleGeometry(10, 32); |
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const lakeMat = new THREE.MeshPhongMaterial({ color: 0x4682b4 }); |
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city.lakeCenters.forEach(center => { |
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const lake = new THREE.Mesh(lakeGeo, lakeMat); |
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lake.rotation.x = -Math.PI / 2; |
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lake.position.set(center.x, 0, center.y); |
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scene.add(lake); |
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}); |
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// Add bridges |
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const bridgeGeo = new THREE.BoxGeometry(5, 0.2, 15); |
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const bridgeMat = new THREE.MeshPhongMaterial({ color: 0x808080 }); |
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const bridge1 = new THREE.Mesh(bridgeGeo, bridgeMat); |
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bridge1.position.set(15, 0.2, 20); |
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scene.add(bridge1); |
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// Controls |
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controls = new THREE.OrbitControls(camera, renderer.domElement); |
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controls.enableDamping = true; |
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controls.target.set(0, 0, 0); |
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// Initialize city |
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city = new CitySimulator(); |
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city.addBlock(scene, 0, 0); |
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// Events |
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window.addEventListener('resize', onWindowResize); |
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document.getElementById('evolve').addEventListener('click', () => city.evolve()); |
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document.getElementById('reset').addEventListener('click', resetView); |
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animate(); |
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} |
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function resetView() { |
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camera.position.set(0, 50, 80); |
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controls.target.set(0, 0, 0); |
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controls.update(); |
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} |
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function onWindowResize() { |
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const width = window.innerWidth; |
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const height = width * (9/16); |
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camera.aspect = 16 / 9; |
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camera.updateProjectionMatrix(); |
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renderer.setSize(width, height); |
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} |
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function animate() { |
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requestAnimationFrame(animate); |
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controls.update(); |
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renderer.render(scene, camera); |
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} |
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init(); |
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</script> |
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</body> |
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</html> |
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""" |
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components.html(html_code, height=600) |
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st.sidebar.title("City Evolution Simulator") |
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st.sidebar.write(""" |
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## How to Play |
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Watch a 3D city evolve with lakes, hills, and building blocks. |
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### Controls: |
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- **Evolve City**: Grow the city |
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- **Reset View**: Return to default view |
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- **Left-click + drag**: Rotate |
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- **Right-click + drag**: Pan |
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- **Scroll**: Zoom |
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### Features: |
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- 16:9 play area |
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- Blocks (10x10 units) with up to 5 buildings |
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- Buildings evolve floor-by-floor using L-systems |
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- Terrain with hills and lakes |
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- Waterfront properties grow larger |
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- Bridges connect land masses |
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""") |
