git.r.bdr.sh - rbdr/lissajous/blob - lib/systems/camera_rotator.js

   1 import { mat4, vec3 } from 'gl-matrix';
   2 import { System } from '@serpentity/serpentity';
   3 import Cameras from '../nodes/cameras';
   4
   5 export default class CameraRotator extends System {
   6
   7   constructor() {
   8
   9     super();
  10   }
  11
  12   added(engine){
  13
  14     this.cameras = engine.getNodes(Cameras);
  15   }
  16
  17   removed(){
  18
  19     delete this.cameras;
  20   }
  21
  22   update(dt){
  23
  24     for (const camera of this.cameras) {
  25
  26       let rotationMatrix = mat4.create();
  27       mat4.rotateY(rotationMatrix, rotationMatrix, camera.angle.yaw);
  28       mat4.rotateX(rotationMatrix, rotationMatrix, camera.angle.pitch);
  29       mat4.rotateZ(rotationMatrix, rotationMatrix, camera.angle.roll);
  30
  31       let eye = vec3.fromValues(0, 0, camera.radius.radius);
  32       vec3.transformMat4(eye, eye, rotationMatrix);
  33
  34       camera.position.x = eye[0];
  35       camera.position.y = eye[1];
  36       camera.position.z = eye[2];
  37
  38       let up = vec3.fromValues(0, 1, 0);
  39       vec3.transformMat4(up, up, rotationMatrix);
  40       camera.up.x = up[0];
  41       camera.up.y = up[1];
  42       camera.up.z = up[2];
  43
  44       camera.angle.pitch = (camera.angle.pitch + camera.velocity.x * dt / 500 + 2 * Math.PI) % (2 * Math.PI);
  45       camera.angle.yaw = (camera.angle.yaw + camera.velocity.y * dt / 500 + 2 * Math.PI) % (2 * Math.PI);
  46       camera.angle.roll = (camera.angle.roll + camera.velocity.z * dt / 500 + 2 * Math.PI) % (2 * Math.PI);
  47     }
  48   }
  49 };