CameraTransform.java

package com.javamarcher.ecs.component;

import org.joml.Vector3f;
import at.fhooe.mtd.ecs.Component;

/**
 * Own transform implementation for the camera position and especially rotation handling.
 */
public class CameraTransform extends Component {
	// X Axis rotation
	private float pitch = 0f;
	
	// Y Axis rotation
	private float yaw = 90f;
	
	public Vector3f position = new Vector3f(0, 0, 0);
	public Vector3f forward = new Vector3f(0, 0, 1);
	public Vector3f right = new Vector3f(1, 0, 0);
	public Vector3f up = new Vector3f(0, 1, 0);
	
	public CameraTransform() {
		updateCameraVectors();
	}
	
	public void translate(Vector3f translation) {
		position.add(translation);
	}

	public void processMouseMovement(float xOffset, float yOffset) {
		yaw += xOffset;
		pitch += yOffset;
		
		// Constrain bounds
		if(pitch > 89.0f) {
			pitch = 89.0f;
		}
		if(pitch < -89.0f) {
			pitch = -89.0f;
		}
		
		updateCameraVectors();
	}
	
	private void updateCameraVectors() {
		final Vector3f front = new Vector3f();
		front.x = (float) (Math.cos(Math.toRadians(yaw)) * Math.cos(Math.toRadians(pitch)));
		front.y = (float) Math.sin(Math.toRadians(pitch));
		front.z = (float) (Math.sin(Math.toRadians(yaw)) * Math.cos(Math.toRadians(pitch)));
		
		forward.set(front.normalize());
		
		// Calculate right and up vector
		right.set(new Vector3f(front).cross(Transformation.LOCAL_UP));
		up.set(new Vector3f(right).cross(forward).normalize());
	}

	public float getPitch() {
		return pitch;
	}

	public void setPitch(float pitch) {
		this.pitch = pitch;
		updateCameraVectors();
	}

	public float getYaw() {
		return yaw;
	}

	public void setYaw(float yaw) {
		this.yaw = yaw;
		updateCameraVectors();
	}
}