CODEWITHSUNDEEP
user-interfaceunity-game-engine
Yura Koval
Yura Koval

Reputation: 133

Unity3d. How to get screen or world position of ui element

I have UI elements (image, etc). Canvas attached to camera. There is a RectTransform, but how to convert this data to screen or world coordinates and get center point of this image?

Tried RectTransform.GetWorldCorners but it returns zero vectors.

Upvotes: 13

Views: 27162

Answers (4)

Onat Korucu
Onat Korucu

Reputation: 1042

Following Huacanacha's guidance,

Vector2 _centerPosition = _rectTransform.TransformPoint(_rectTransform.rect.center);

will give you the WorldCoordinate of the center of the image.

Upvotes: 0

Kay
Kay

Reputation: 13146

You can work with GetWorldCorners but only when using a child that has real dimensions. I got reasonable values for a child of a world space canvas.

Upvotes: 2

Huacanacha
Huacanacha

Reputation: 1161

yourRectTransform.rect.center for the centre point in local space.

yourRectTransform.TransformPoint to convert to world space.

It is odd that RectTransform.GetWorldCorners doesn't work as stated. Per one of the other answers you need to call after Awake (so layout can occur).

Upvotes: 19

alex
alex

Reputation: 71

I found that both GetWorldCorners and TransformPoint only work on Start(), not on Awake(), as if we'll have to wait for the content to be resized

    Vector3 min = referenceArea.rectTransform.TransformPoint(referenceArea.rectTransform.rect.min);
    Vector3 max = referenceArea.rectTransform.TransformPoint(referenceArea.rectTransform.rect.max);

    elementToResize.transform.localScale = new Vector3(Mathf.Abs(min.x - max.x) , Mathf.Abs(min.y - max.y), 1f);
    elementToResize.transform.position = referenceArea.rectTransform.TransformPoint(referenceArea.rectTransform.rect.center);

Upvotes: 4

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