Camera bounds with zoomable camera

Questions & Answers
1

I’m making a top-down 2D shooter and I have a camera control script that allows you to zoom in and out with the scroll wheel. But I need to add bounds to the camera. This is what I have at the moment.

void CameraZoom()
	{
		zoom -= Input.GetAxis("Mouse ScrollWheel") * zoomSensitivity;
		zoom = Mathf.Clamp(zoom, zoomMin, zoomMax);
		cam.orthographicSize = Mathf.Lerp(cam.orthographicSize, zoom, Time.deltaTime * zoomSpeed);
		CalculateCameraBounds();
	}

	void CalculateCameraBounds()
	{
		vertBounds = cam.orthographicSize;
		horzBounds = vertBounds * cam.aspect;

		minX = horzBounds - mapX / 2.0f;
		maxX = mapX / 2.0f - horzBounds;
		minY = vertBounds - mapY / 2.0f;
		maxY = mapY / 2.0f - vertBounds;
	}

	void CameraFollow()
	{
		Vector3 targetPosition = new Vector3(target.position.x, target.position.y, transform.position.z);

		Vector3 boundPosition = new Vector3(
			Mathf.Clamp(targetPosition.x, maxX, minX),
			Mathf.Clamp(targetPosition.y, minY, maxY),
			transform.position.z);

		transform.position = Vector3.Lerp(transform.position, boundPosition, smoothing);
	}

This works for bounding the camera’s Y position,. but doesn’t for the X. It just makes the minX and maxX values larger, unlike the the minY and maxY values getting smaller like I want. I’m pretty sure I know the issue lies here:

vertBounds = cam.orthographicSize;
horzBounds = vertBounds * cam.aspect;

As I zoom the camera out, the orthographic size gets larger, which is then being multiplied by the aspect , thus making the horizontal bounds larger rather than smaller. I’m aware of this and have spent hours trying to figure out a way to change it up so that doesn’t happen, but nothing comes to mind. Would appreciate any ideas or solutions.

2

After staring at this for several hours, I finally managed to figure this out and it was VERY simple.

minX = horzBounds - mapX / 2.0f;
maxX = mapX / 2.0f - horzBounds;

Here I was dividing the mapX by two. but what I should have been doing was MULTIPLYING it by 2.

minX = horzBounds - mapX * 2.0f;
maxX = mapX * 2.0f - horzBounds;

This change has made it work properly assuming I have the mapX set properly.