black-hole-renderer/Camera.js at master · peabrainiac/black-hole-renderer

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import Matrix3f from "./gl/Matrix3f.js";

import Matrix4f from "./gl/Matrix4f.js";

import Vector3f from "./gl/Vector3f.js";

import InputHandler from "./InputHandler.js";

export default class Camera{

/**

* @param {InputHandler} inputHandler

constructor(inputHandler){

this._position = new Vector3f(0,0,-2);

this._rotation = new Matrix3f();

this._inputHandler = inputHandler;

}

/**

* @param {number} deltaT time since last frame in seconds

update(deltaT){

deltaT *= 0.25;

let rx = this._inputHandler.getMouseDeltaX()/500;

let ry = this._inputHandler.getMouseDeltaY()/500;

let dx = 2*(+this._inputHandler.keys.d-(+this._inputHandler.keys.a))*deltaT;

let dy = 2*(+this._inputHandler.keys.space-(+this._inputHandler.keys.shift))*deltaT;

let dz = 2*(+this._inputHandler.keys.w-(+this._inputHandler.keys.s))*deltaT;

this._rotation.rotateExp(ry,rx,0);

this._position.add(this._rotation.mulVec(new Vector3f(dx,dy,dz)));

}

get viewMatrix(){

// computes the inverse assuming `_rotation` is in fact a rotation matrix.

let rotationInverse = this._rotation.getTranspose();

return Matrix4f.transformationMatrix(rotationInverse,rotationInverse.mulVec(this._position).scale(-1));

}

get position(){

return this._position;

}