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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="3D City Evolution Simulator", layout="wide") |
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st.title("3D City Evolution Simulator") |
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st.write("Watch a 3D city grow with lakes, hills, and evolving blocks") |
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max_width = min(1200, st.session_state.get('window_width', 1200)) |
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max_height = min(1600, st.session_state.get('window_height', 1600)) |
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col1, col2 = st.columns(2) |
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with col1: |
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container_width = st.slider("Container Width (px)", 300, max_width, 768, step=50) |
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with col2: |
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container_height = st.slider("Container Height (px)", 400, max_height, 1024, step=50) |
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html_code = f""" |
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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>3D City Evolution Simulator</title> |
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<style> |
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body {{ margin: 0; overflow: hidden; }} |
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#container {{ width: {container_width}px; height: {container_height}px; margin: 0 auto; }} |
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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 id="container"></div> |
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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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let baseWidth = 1.5; // Starting wider base |
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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 = baseWidth * (1 - height / maxHeight); // Narrower as it goes up |
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const floorHeight = 2 + Math.random() * 2; // Taller floors |
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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; |
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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) ? 20 : 12 |
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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); |
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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(scene) {{ |
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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) * 90; // Adjusted for 3:4 |
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const z = (Math.random() - 0.5) * 120; |
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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.getElementById('container'); |
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if (!container) {{ |
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console.error('Container not found'); |
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return; |
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}} |
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// Scene |
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scene = new THREE.Scene(); |
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scene.background = new THREE.Color(0x87CEEB); |
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// Camera with 3:4 aspect ratio |
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camera = new THREE.PerspectiveCamera(75, 3 / 4, 0.1, 1000); |
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camera.position.set(0, 50, 60); |
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// Renderer |
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renderer = new THREE.WebGLRenderer({{ antialias: true }}); |
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renderer.setSize({container_width}, {container_height}); |
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container.appendChild(renderer.domElement); |
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// Lights |
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const ambientLight = new THREE.AmbientLight(0x404040); |
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scene.add(ambientLight); |
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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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// Ground with 3:4 ratio (90x120) |
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const groundGeo = new THREE.PlaneGeometry(90, 120, 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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// 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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const lakeCenters = [new THREE.Vector2(20, 20), new THREE.Vector2(-30, 10)]; |
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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, 0.01, center.y); |
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scene.add(lake); |
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}}); |
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// Bridge |
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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 bridge = new THREE.Mesh(bridgeGeo, bridgeMat); |
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bridge.position.set(15, 0.2, 20); |
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scene.add(bridge); |
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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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// 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(scene)); |
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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, 60); |
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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 = {container_width}; |
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const height = {container_height}; |
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camera.aspect = 3 / 4; |
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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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window.onload = 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, width=container_width, height=container_height) |
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st.sidebar.title("3D 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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- **Sliders**: Adjust play area size |
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### Features: |
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- 3:4 initial play area (768x1024) |
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- Blocks (10x10 units) with up to 5 buildings |
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- Buildings start wide, grow taller with smaller floors |
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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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""") |
