asgn3/camera.js at main · jasmath03/asgn3 · GitHub

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class Camera {
  constructor(canvas) {

    this.fov = 60;

    this.eye = new Vector3([16, 3, 16]);
    this.at  = new Vector3([16, 3, 15]);
    this.up  = new Vector3([0, 1, 0]);

    this.viewMatrix = new Matrix4();
    this.projectionMatrix = new Matrix4();

    this.speed = 0.5;
    this.angleSpeed = 2;

    this.canvas = canvas;

    this.updateView();
    this.updateProjection();
  }

  updateView() {
    this.viewMatrix.setLookAt(
        this.eye.elements[0], this.eye.elements[1], this.eye.elements[2],
        this.at.elements[0],  this.at.elements[1],  this.at.elements[2],
        this.up.elements[0],  this.up.elements[1],  this.up.elements[2]
    );
  }

  updateProjection() {
    this.projectionMatrix.setPerspective(
        this.fov,
        this.canvas.width / this.canvas.height,
        0.1,
        1000
    );
  }

  moveForward() {

    let fx = this.at.elements[0] - this.eye.elements[0];
    let fy = this.at.elements[1] - this.eye.elements[1];
    let fz = this.at.elements[2] - this.eye.elements[2];

    let len = Math.sqrt(fx*fx + fy*fy + fz*fz);
    fx/=len; fy/=len; fz/=len;

    this.eye.elements[0] += fx * this.speed;
    this.eye.elements[1] += fy * this.speed;
    this.eye.elements[2] += fz * this.speed;

    this.at.elements[0] += fx * this.speed;
    this.at.elements[1] += fy * this.speed;
    this.at.elements[2] += fz * this.speed;

    this.updateView();
  }

  moveBackwards() {

    let fx = this.eye.elements[0] - this.at.elements[0];
    let fy = this.eye.elements[1] - this.at.elements[1];
    let fz = this.eye.elements[2] - this.at.elements[2];

    let len = Math.sqrt(fx*fx + fy*fy + fz*fz);
    fx/=len; fy/=len; fz/=len;

    this.eye.elements[0] += fx * this.speed;
    this.eye.elements[1] += fy * this.speed;
    this.eye.elements[2] += fz * this.speed;

    this.at.elements[0] += fx * this.speed;
    this.at.elements[1] += fy * this.speed;
    this.at.elements[2] += fz * this.speed;

    this.updateView();
  }

  moveLeft() {

    let fx = this.at.elements[0] - this.eye.elements[0];
    let fy = this.at.elements[1] - this.eye.elements[1];
    let fz = this.at.elements[2] - this.eye.elements[2];

    // cross(up, forward)
    let sx = this.up.elements[1]*fz - this.up.elements[2]*fy;
    let sy = this.up.elements[2]*fx - this.up.elements[0]*fz;
    let sz = this.up.elements[0]*fy - this.up.elements[1]*fx;

    let len = Math.sqrt(sx*sx + sy*sy + sz*sz);
    sx/=len; sy/=len; sz/=len;

    this.eye.elements[0] += sx * this.speed;
    this.eye.elements[1] += sy * this.speed;
    this.eye.elements[2] += sz * this.speed;

    this.at.elements[0] += sx * this.speed;
    this.at.elements[1] += sy * this.speed;
    this.at.elements[2] += sz * this.speed;

    this.updateView();
  }

  moveRight() {

    let fx = this.at.elements[0] - this.eye.elements[0];
    let fy = this.at.elements[1] - this.eye.elements[1];
    let fz = this.at.elements[2] - this.eye.elements[2];

    // cross(forward, up)
    let sx = fy*this.up.elements[2] - fz*this.up.elements[1];
    let sy = fz*this.up.elements[0] - fx*this.up.elements[2];
    let sz = fx*this.up.elements[1] - fy*this.up.elements[0];

    let len = Math.sqrt(sx*sx + sy*sy + sz*sz);
    sx/=len; sy/=len; sz/=len;

    this.eye.elements[0] += sx * this.speed;
    this.eye.elements[1] += sy * this.speed;
    this.eye.elements[2] += sz * this.speed;

    this.at.elements[0] += sx * this.speed;
    this.at.elements[1] += sy * this.speed;
    this.at.elements[2] += sz * this.speed;

    this.updateView();
  }

  panLeft() {

    let f = new Vector3([
      this.at.elements[0]-this.eye.elements[0],
      this.at.elements[1]-this.eye.elements[1],
      this.at.elements[2]-this.eye.elements[2]
    ]);

    let rot = new Matrix4();
    rot.setRotate(this.angleSpeed, 0,1,0);

    let f2 = rot.multiplyVector3(f);

    this.at.elements[0] = this.eye.elements[0] + f2.elements[0];
    this.at.elements[1] = this.eye.elements[1] + f2.elements[1];
    this.at.elements[2] = this.eye.elements[2] + f2.elements[2];

    this.updateView();
  }

  panRight() {

    let f = new Vector3([
      this.at.elements[0]-this.eye.elements[0],
      this.at.elements[1]-this.eye.elements[1],
      this.at.elements[2]-this.eye.elements[2]
    ]);

    let rot = new Matrix4();
    rot.setRotate(-this.angleSpeed, 0,1,0);

    let f2 = rot.multiplyVector3(f);

    this.at.elements[0] = this.eye.elements[0] + f2.elements[0];
    this.at.elements[1] = this.eye.elements[1] + f2.elements[1];
    this.at.elements[2] = this.eye.elements[2] + f2.elements[2];

    this.updateView();
  }
  rotate(deltaYaw, deltaPitch) {

    this.yaw += deltaYaw;
    this.pitch += deltaPitch;

    // clamp pitch to avoid flipping
    if(this.pitch > 89) this.pitch = 89;
    if(this.pitch < -89) this.pitch = -89;

    let radYaw = this.yaw * Math.PI / 180;
    let radPitch = this.pitch * Math.PI / 180;

    let fx = Math.cos(radPitch) * Math.sin(radYaw);
    let fy = Math.sin(radPitch);
    let fz = -Math.cos(radPitch) * Math.cos(radYaw);

    this.at.elements[0] = this.eye.elements[0] + fx;
    this.at.elements[1] = this.eye.elements[1] + fy;
    this.at.elements[2] = this.eye.elements[2] + fz;

    this.updateView();
  }

}