threejs-pathfinding-example/index.html at master · be9concepts/threejs-pathfinding-example · GitHub

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<html>
	<head>
		<title>Three.js Pathfinding Example</title>
		<style>
			body { margin: 0; }
			canvas { width: 100%; height: 100% }
		</style>
	</head>
	<body>
		<script src="js/three.min.js"></script>
		<script src="js/OrbitControls.js"></script>
		<script src="js/astar.js"></script>
		<script>
			var scene = new THREE.Scene();
			var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );
			var mouse = new THREE.Vector2();
			document.addEventListener( 'mousemove', onDocumentMouseMove, false );
			document.addEventListener( 'click', onDocumentClick, false );

			var renderer = new THREE.WebGLRenderer();
			renderer.setSize( window.innerWidth, window.innerHeight );
			document.body.appendChild( renderer.domElement );
			var grid = {};
			grid.nodes = [];
			grid.size = {
				width:10,
				height:10
			}
				var node_size = new THREE.Vector3(1,.1,1)
			grid.makeNode = function(position, dex){
				var rand = Math.floor(Math.random()*10);
				var isWall = false;
				var color = 0xff0000;
				var node_geo = new THREE.CubeGeometry(node_size.x,node_size.y,node_size.z);
				if (rand ==  0) {
					isWall = true;
					node_geo = new THREE.CubeGeometry(node_size.x,5,node_size.z);
					color = 0xafafaf;
					row.push(0);
				}
				else {
					row.push(1);
				}
				var node = new THREE.Mesh(node_geo);
				node.material.color.setHex(color);
				node.originalColor = node.material.color.getHex();
				scene.add(node);
				node.isWall = isWall;
				node.position.x = position.x + (node_size.x/2);
				node.position.y = position.y + (node_size.y/2);
				if (isWall) node.position.y = 5/2
				node.position.z = position.z + (node_size.z/2);
				node.z = dex.across;
				node.x = dex.down;
				grid.nodes.push(node);

			}
			grid.rows = [];
			var row = [];
			grid.draw = function(){
				var node_count = grid.size.width * grid.size.height;
				var index = {
					across:0,
					down:0
				}
				for (var i = 0; i < node_count; i++) {
					grid.makeNode(new THREE.Vector3((-grid.size.width/2)+(node_size.x*index.across), 0, (-grid.size.height/2)+(node_size.z*index.down)),index);
					index.across++;
					if (index.across >= grid.size.width){
						index.across = 0;
						index.down++;
						grid.rows.push(row);
						row = [];
					}
				}
				console.log(grid.rows)
			}


			grid.draw();

			// create the thing we want to move
			var geometry = new THREE.CylinderGeometry( .5,.5, 3);
			var material = new THREE.MeshBasicMaterial( {color: 0x00ff00} );
			var player = new THREE.Mesh( geometry, material );
			scene.add( player );

			player.position.x = grid.nodes[0].position.x;
			player.position.y = 1.5;
			player.position.z = grid.nodes[0].position.z;

			// create the thing we want to move to
			var geometry = new THREE.CylinderGeometry( .25,.25, 3);
			var material = new THREE.MeshBasicMaterial( {color: 0xffffff} );
			var goal = new THREE.Mesh( geometry, material );
			scene.add( goal );

			goal.position.x = grid.nodes[grid.nodes.length-1].position.x;
			goal.position.y = 1.5;
			goal.position.z = grid.nodes[grid.nodes.length-1].position.z;


			camera.position.z = 11;
			camera.position.y = 25;
			camera.lookAt(new THREE.Vector3(0,0,0))
			var controls = new THREE.OrbitControls( camera, renderer.domElement );
			var raycaster = new THREE.Raycaster();
			var animate = function () {
				controls.update(); // required if controls.enableDamping = true, or if controls.autoRotate = true
				requestAnimationFrame( animate );
				renderer.render(scene, camera);
			};


			animate();
			function onDocumentMouseMove( event ) {
				event.preventDefault();
				mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
				mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
			}
			function onDocumentClick(event){

				// raycast from camera to mouse.
				// check against nodes in grid.
				raycaster.setFromCamera( mouse, camera );
				var intersects = raycaster.intersectObjects( grid.nodes );
				if (intersects.length > 0){
					var node = intersects[0].object;
					if (!node.isWall){
						goal.position.x = node.position.x;
						goal.position.z = node.position.z;
						// make graph
						var graph = new Graph([
							grid.rows[0],grid.rows[1],grid.rows[2],grid.rows[3],grid.rows[4],grid.rows[5],grid.rows[6],grid.rows[7],grid.rows[8],grid.rows[9]
						]);

						// solve
						var start = graph.grid[0][0];
						var end = graph.grid[node.x][node.z];
						var result = astar.search(graph, start, end);
						console.log(result[0].x,result[0].y)

						// reset node colors
						for (var i = 0; i < grid.nodes.length; i++) {
							grid.nodes[i].material.color.setHex(grid.nodes[i].originalColor)
						}
						// highlight nodes in path
						for (var i = 0; i < grid.nodes.length; i++) {
							var node1 = grid.nodes[i]
							if (node1.isWall) continue;
							for (var j = 0; j < result.length; j++) {
								var resNode = result[j]
								if (node1.x == resNode.x && node1.z ==resNode.y){
									node1.material.color.setHex(0xfcbbcf)
								}
							}
						}
					}
				}
			}
		</script>
	</body>
</html>