Class CameraController

examples/hello_camera.js:5–70

import { Vector3, Matrix4, PerspectiveFov, Deg } from "./extern/gmath.bundle.js";

export class CameraController {
  speed = 0;
  isLeftPressed = false;
  isRightPressed = false;
  isForwardPressed = false;
  isBackwardPressed = false;

  constructor(speed) {
    this.speed = speed;
  }

  onEvent(event) {
    if (event.type === "windowEvent") {
      event = event.event;
      if (event.type === "keyboardInput") {
        const pressed = event.input.state === "pressed";

        switch (event.input.keyCode) {
          case 57416: // up
            this.isForwardPressed = pressed;
            break;

          case 57424: // down
            this.isBackwardPressed = pressed;
            break;

          case 57419: // left
            this.isLeftPressed = pressed;
            break;

          case 57421: // right
            this.isRightPressed = pressed;
            break;
        }
      }
    }
  }

  /** @param {Camera} camera */
  updateCamera(camera) {
    let forward = camera.target.sub(camera.eye);
    const forwardNorm = forward.normal();
    let forwardMag = forward.mag();

    if (this.isForwardPressed && forwardMag > this.speed) {
      camera.eye = camera.eye.add(forwardNorm.mul(this.speed));
    }

    if (this.isBackwardPressed) {
      camera.eye = camera.eye.sub(forwardNorm.mul(this.speed));
    }

    const right = forwardNorm.cross(camera.up);

    forward = camera.target.sub(camera.eye);
    forwardMag = forward.mag();

    if (this.isRightPressed) {