87 lines
2.5 KiB
C#
87 lines
2.5 KiB
C#
// Copyright (c) Pixel Crushers. All rights reserved.
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using UnityEngine;
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namespace PixelCrushers
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{
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/// <summary>
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/// Keeps a RectTransform's bounds in view of the main camera.
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/// Works best on world space panels.
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/// Improvements contribued by Sayezz.
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/// </summary>
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[AddComponentMenu("")] // Use wrapper.
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[RequireComponent(typeof(RectTransform))]
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public class KeepRectTransformOnscreen : MonoBehaviour
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{
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private RectTransform rectTransform;
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private float originalX = 0;
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private bool applied = false;
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private Camera mainCamera = null;
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private void Start()
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{
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rectTransform = GetComponent<RectTransform>();
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originalX = rectTransform.position.x;
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mainCamera = Camera.main;
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}
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private void OnEnable()
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{
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applied = false;
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RestoreOriginalPosition();
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}
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private void LateUpdate()
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{
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if (mainCamera == null || rectTransform == null) return;
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Vector3[] worldCorners = new Vector3[4];
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rectTransform.GetWorldCorners(worldCorners);
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// Convert position and corners to screen space:
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Vector3 pos = mainCamera.WorldToViewportPoint(rectTransform.position);
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Vector3 bottomLeft = mainCamera.WorldToViewportPoint(worldCorners[0]);
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Vector3 topRight = mainCamera.WorldToViewportPoint(worldCorners[2]);
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float offsetX = 0f;
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if (topRight.x > 1)
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{
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offsetX = topRight.x - 1;
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}
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else if (bottomLeft.x < 0)
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{
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offsetX = bottomLeft.x;
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}
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if (offsetX != 0)
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{
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pos.x = Mathf.Clamp(pos.x - offsetX, 0, 1);
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rectTransform.position = mainCamera.ViewportToWorldPoint(pos);
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applied = true;
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}
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else
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{
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if (!applied)
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{
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RestoreOriginalPosition();
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}
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}
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}
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private void RestoreOriginalPosition()
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{
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if (mainCamera == null || rectTransform == null) return;
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rectTransform.position = new Vector3(originalX, rectTransform.position.y, rectTransform.position.z);
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Vector3 pos1 = mainCamera.WorldToViewportPoint(rectTransform.position);
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rectTransform.position = mainCamera.ViewportToWorldPoint(pos1);
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}
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}
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}
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