How to convert camera screen boundary to global position?

Question

I am trying to spawn enemies at the edge of the camera. But I do not know how to get the edges of the camera as positions. I can get the middle of the screen using Camera.GetCameraScreenCenter() and the size of the camera viewport with Camera.GetViewport().Size. But since the viewport is in pixels, I do not know how to offset the screen center by 2D units.

Comments

I think when working in 2d the pixels are the units, unless you have done scaling to your nodes.

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@magicalogic using your insight, I was able to solve this. If you write your comment as a post, I can mark it as best answer.

Answer 1

just add / subtract half the size to the center to get the edges.

Answer 2

The below code is how I achieved computing camera center and edge position calculations, maybe it can help you:

func computeScreenCenter():

    var minPos = computeMinimumPointBoundary()

    var maxPos = computeMaximumPointBoundary()

    var screenRect = Rect2(minPos,Vector2())

    screenRect = screenRect.expand(maxPos)

    return calculate_center(screenRect)



func computeMinimumPointBoundary():

    # Get view rectangle

    var ctrans = getcanvastransform()

    var minpos = (-ctrans.getorigin() / ctrans.getscale())

    return minpos

func computeMaximumPointBoundary():

    # Get view rectangle

    var ctrans = getcanvastransform()

    var minpos = -ctrans.getorigin() / ctrans.getscale()

    var viewsize = getviewportrect().size / ctrans.getscale()

    var maxpos = minpos + viewsize

    return max_pos

func calculate_center(rect):

    return Vector2(

            rect.position.x + rect.size.x/2,

            rect.position.y + rect.size.y/2)

Answer 3

When working in 2d the pixels are the units, unless you have done scaling to your nodes.