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| 1 | +import { |
| 2 | + AfterViewInit, |
| 3 | + CUSTOM_ELEMENTS_SCHEMA, |
| 4 | + Component, |
| 5 | + ElementRef, |
| 6 | + OnInit, |
| 7 | + ViewChild, |
| 8 | + computed, |
| 9 | + inject, |
| 10 | + signal, |
| 11 | +} from '@angular/core'; |
| 12 | +import { NgtArgs, NgtCanvas, NgtRenderState, NgtState, NgtStore, injectBeforeRender } from 'angular-three'; |
| 13 | +import * as THREE from 'three'; |
| 14 | + |
| 15 | +@Component({ |
| 16 | + standalone: true, |
| 17 | + templateUrl: 'scene.html', |
| 18 | + schemas: [CUSTOM_ELEMENTS_SCHEMA], |
| 19 | + imports: [NgtArgs], |
| 20 | + host: { '(document:keydown)': 'onKeyDown($event)' }, |
| 21 | +}) |
| 22 | +class SceneGraph implements OnInit, AfterViewInit { |
| 23 | + readonly Math = Math; |
| 24 | + readonly #aspect = inject(NgtStore).select('viewport', 'aspect'); |
| 25 | + |
| 26 | + readonly perspectiveAspect = computed(() => this.#aspect() / 2); |
| 27 | + readonly left = computed(() => (300 * this.#aspect()) / -2); |
| 28 | + readonly right = computed(() => (300 * this.#aspect()) / 2); |
| 29 | + |
| 30 | + readonly vertices = Array.from({ length: 10000 }, () => [ |
| 31 | + THREE.MathUtils.randFloatSpread(2000), |
| 32 | + THREE.MathUtils.randFloatSpread(2000), |
| 33 | + THREE.MathUtils.randFloatSpread(2000), |
| 34 | + ]).flat(); |
| 35 | + |
| 36 | + readonly #activeCamera = signal<THREE.Camera>(null!); |
| 37 | + readonly #activeHelper = signal<THREE.CameraHelper>(null!); |
| 38 | + |
| 39 | + @ViewChild('perspectiveCamera', { static: true }) perspectiveCamera!: ElementRef<THREE.PerspectiveCamera>; |
| 40 | + @ViewChild('orthographicCamera', { static: true }) orthographicCamera!: ElementRef<THREE.OrthographicCamera>; |
| 41 | + @ViewChild('perspectiveHelper') perspectiveHelper?: ElementRef<THREE.CameraHelper>; |
| 42 | + @ViewChild('orthographicHelper') orthographicHelper?: ElementRef<THREE.CameraHelper>; |
| 43 | + @ViewChild('cameras', { static: true }) cameraGroup!: ElementRef<THREE.Group>; |
| 44 | + @ViewChild('mesh', { static: true }) mesh!: ElementRef<THREE.Mesh>; |
| 45 | + |
| 46 | + constructor() { |
| 47 | + injectBeforeRender(this.#onBeforeRender.bind(this), { priority: 1 }); |
| 48 | + } |
| 49 | + |
| 50 | + ngOnInit() { |
| 51 | + this.#activeCamera.set(this.perspectiveCamera.nativeElement); |
| 52 | + } |
| 53 | + |
| 54 | + ngAfterViewInit() { |
| 55 | + this.#activeHelper.set(this.perspectiveHelper!.nativeElement); |
| 56 | + } |
| 57 | + |
| 58 | + onKeyDown({ key }: KeyboardEvent) { |
| 59 | + switch (key.toLowerCase()) { |
| 60 | + case 'o': |
| 61 | + this.#activeCamera.set(this.orthographicCamera.nativeElement); |
| 62 | + this.#activeHelper.set(this.orthographicHelper!.nativeElement); |
| 63 | + break; |
| 64 | + case 'p': |
| 65 | + this.#activeCamera.set(this.perspectiveCamera.nativeElement); |
| 66 | + this.#activeHelper.set(this.perspectiveHelper!.nativeElement); |
| 67 | + } |
| 68 | + } |
| 69 | + |
| 70 | + #onBeforeRender({ gl, size, camera, scene }: NgtRenderState) { |
| 71 | + if (!this.#activeCamera() || !this.#activeHelper()) return; |
| 72 | + const r = Date.now() * 0.0005; |
| 73 | + // reassign shorthands |
| 74 | + const mesh = this.mesh.nativeElement; |
| 75 | + const cameraGroup = this.cameraGroup.nativeElement; |
| 76 | + const perspectiveCamera = this.perspectiveCamera.nativeElement; |
| 77 | + const perspectiveHelper = this.perspectiveHelper?.nativeElement; |
| 78 | + const orthographicCamera = this.orthographicCamera.nativeElement; |
| 79 | + const orthographicHelper = this.orthographicHelper?.nativeElement; |
| 80 | + |
| 81 | + mesh.position.x = 700 * Math.cos(r); |
| 82 | + mesh.position.z = 700 * Math.sin(r); |
| 83 | + mesh.position.y = 700 * Math.sin(r); |
| 84 | + |
| 85 | + mesh.children[0].position.x = 70 * Math.cos(2 * r); |
| 86 | + mesh.children[0].position.y = 70 * Math.sin(r); |
| 87 | + |
| 88 | + if (perspectiveCamera && orthographicCamera && perspectiveHelper && orthographicHelper) { |
| 89 | + if (this.#activeCamera() === perspectiveCamera) { |
| 90 | + perspectiveCamera.fov = 35 + 30 * Math.sin(0.5 * r); |
| 91 | + perspectiveCamera.far = mesh.position.length(); |
| 92 | + perspectiveCamera.updateProjectionMatrix(); |
| 93 | + |
| 94 | + perspectiveHelper.update(); |
| 95 | + perspectiveHelper.visible = true; |
| 96 | + |
| 97 | + orthographicHelper.visible = false; |
| 98 | + } else { |
| 99 | + orthographicCamera.far = mesh.position.length(); |
| 100 | + orthographicCamera.updateProjectionMatrix(); |
| 101 | + |
| 102 | + orthographicHelper.update(); |
| 103 | + orthographicHelper.visible = true; |
| 104 | + |
| 105 | + perspectiveHelper.visible = false; |
| 106 | + } |
| 107 | + } |
| 108 | + |
| 109 | + cameraGroup.lookAt(mesh.position); |
| 110 | + |
| 111 | + gl.clear(); |
| 112 | + |
| 113 | + this.#activeHelper().visible = false; |
| 114 | + gl.setViewport(0, 0, size.width / 2, size.height); |
| 115 | + gl.render(scene, this.#activeCamera()); |
| 116 | + |
| 117 | + this.#activeHelper().visible = true; |
| 118 | + |
| 119 | + gl.setViewport(size.width / 2, 0, size.width / 2, size.height); |
| 120 | + gl.render(scene, camera); |
| 121 | + } |
| 122 | +} |
| 123 | + |
| 124 | +@Component({ |
| 125 | + standalone: true, |
| 126 | + templateUrl: 'index.html', |
| 127 | + imports: [NgtCanvas], |
| 128 | +}) |
| 129 | +export default class Camera { |
| 130 | + readonly scene = SceneGraph; |
| 131 | + |
| 132 | + onCreated({ gl, camera, viewport }: NgtState) { |
| 133 | + gl.autoClear = false; |
| 134 | + (camera as THREE.PerspectiveCamera).aspect = viewport.aspect / 2; |
| 135 | + } |
| 136 | +} |
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