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import { mat4, vec3 } from 'gl-matrix';
import { System } from '@serpentity/serpentity';
import Cameras from '../nodes/cameras';
/**
* Rotates the camera around a "sphere"
*/
export default class CameraRotator extends System {
constructor() {
super();
}
added(engine){
this.cameras = engine.getNodes(Cameras);
}
removed(){
delete this.cameras;
}
update(dt){
for (const camera of this.cameras) {
let rotationMatrix = mat4.create();
mat4.rotateY(rotationMatrix, rotationMatrix, camera.angle.yaw);
mat4.rotateX(rotationMatrix, rotationMatrix, camera.angle.pitch);
mat4.rotateZ(rotationMatrix, rotationMatrix, camera.angle.roll);
let eye = vec3.fromValues(0, 0, camera.radius.radius);
vec3.transformMat4(eye, eye, rotationMatrix);
camera.position.x = eye[0];
camera.position.y = eye[1];
camera.position.z = eye[2];
let up = vec3.fromValues(0, 1, 0);
vec3.transformMat4(up, up, rotationMatrix);
camera.up.x = up[0];
camera.up.y = up[1];
camera.up.z = up[2];
camera.angle.pitch = (camera.angle.pitch + camera.velocity.x * dt / 500 + 2 * Math.PI) % (2 * Math.PI);
camera.angle.yaw = (camera.angle.yaw + camera.velocity.y * dt / 500 + 2 * Math.PI) % (2 * Math.PI);
camera.angle.roll = (camera.angle.roll + camera.velocity.z * dt / 500 + 2 * Math.PI) % (2 * Math.PI);
}
}
};
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