116 lines
2.7 KiB
JavaScript
116 lines
2.7 KiB
JavaScript
import * as THREE from 'three';
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const HYPERPLANE = 2;
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const NODE_SIZE = 0.01;
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const LINK_SIZE = 0.01;
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class FourDShape extends THREE.Group {
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constructor(node_ms, link_ms, structure) {
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super();
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this.node_ms = node_ms;
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this.link_ms = link_ms;
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this.nodes4 = structure.nodes;
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this.nodes3 = {};
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this.links = structure.links;
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this.hyperplane = HYPERPLANE;
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this.initShapes();
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}
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// if a node/link has no label, use the 0th material
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getMaterial(entity, materials) {
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if( "label" in entity ) {
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return materials[entity.label];
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} else {
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return materials[0];
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}
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}
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makeNode(material, v3) {
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const geometry = new THREE.SphereGeometry(NODE_SIZE);
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const sphere = new THREE.Mesh(geometry, material);
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sphere.position.copy(v3);
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this.add(sphere);
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return sphere;
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}
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makeLink(material, link) {
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const n1 = this.nodes3[link.source].v3;
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const n2 = this.nodes3[link.target].v3;
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const length = n1.distanceTo(n2);
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const centre = new THREE.Vector3();
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centre.lerpVectors(n1, n2, 0.5);
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const geometry = new THREE.CylinderGeometry(LINK_SIZE, LINK_SIZE, 1);
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const cyl = new THREE.Mesh(geometry, material);
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const edge = new THREE.Group();
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edge.add(cyl);
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edge.position.copy(centre);
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edge.scale.copy(new THREE.Vector3(1, 1, length));
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edge.lookAt(n2);
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cyl.rotation.x = Math.PI / 2.0;
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this.add(edge);
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return edge;
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}
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updateLink(link) {
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const n1 = this.nodes3[link.source].v3;
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const n2 = this.nodes3[link.target].v3;
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const length = n1.distanceTo(n2);
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const centre = new THREE.Vector3();
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centre.lerpVectors(n1, n2, 0.5);
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link.object.scale.copy(new THREE.Vector3(1, 1, length));
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link.object.position.copy(centre);
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link.object.lookAt(n2);
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link.object.children[0].rotation.x = Math.PI / 2.0;
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}
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fourDtoV3(x, y, z, w, rotations) {
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const v4 = new THREE.Vector4(x, y, z, w);
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for ( const m4 of rotations ) {
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v4.applyMatrix4(m4);
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}
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const k = this.hyperplane / (this.hyperplane + v4.w);
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return new THREE.Vector3(v4.x * k, v4.y * k, v4.z * k);
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}
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initShapes() {
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for( const n of this.nodes4 ) {
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const v3 = this.fourDtoV3(n.x, n.y, n.z, n.w, []);
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const material = this.getMaterial(n, this.node_ms);
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this.nodes3[n.id] = {
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v3: v3,
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object: this.makeNode(material, v3)
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};
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}
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for( const l of this.links ) {
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const material = this.getMaterial(l, this.link_ms);
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l.object = this.makeLink(material, l);
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}
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}
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render3(rotations) {
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for( const n of this.nodes4 ) {
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const v3 = this.fourDtoV3(n.x, n.y, n.z, n.w, rotations);
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this.nodes3[n.id].v3 = v3;
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this.nodes3[n.id].object.position.copy(v3);
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// could do scaling here
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}
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for( const l of this.links ) {
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this.updateLink(l);
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}
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}
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}
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export { FourDShape }; |