检查 UI 元素/RectTransform 是否重叠

问题描述

我想知道如何检查 Unity Canvas 上的两个 UI 面板是否相互重叠.

I'd like to know how I check whether two UI Panels on my Unity Canvas are overlapping each other.

目前我通过比较画布元素 Rects

Currently I am doing this by comparing the canvas elements Rects

画布设置

• 渲染模式:屏幕空间 - 相机
• 完美像素:[是]
• 渲染相机:主相机
• 平面距离:100
• 排序层:默认
• 层中的顺序:0

画布缩放器设置

• UI 缩放模式:恒定像素大小
• 比例因子:1
• 每单位参考像素:100

我用来检查的代码

[Header("Check For Overlap")]
public RectTransform PlayerBar;
public RectTransform LeftBar;
public Rect RectOne;
public Rect RectTwo;
public bool overlapping;

//Check if the two canvas element Rects overlap each other

public void CheckForOverlap()
{
    overlapping = false;
    // Convert Canvas RectTransforms to World Rects
    RectOne = GetWorldRect(LeftBar);
    RectTwo = GetWorldRect(PlayerBar);

    if (RectOne.Overlaps(RectTwo))
    {
        overlapping = true;
    }
}


public Rect GetWorldRect(RectTransform rt)
{
    //  Get World corners, take top left
    Vector3[] corners = new Vector3[4];
    rt.GetWorldCorners(corners);
    Vector3 topLeft = corners[0];

    // Rect Size ... I'm not sure if this is working correctly?
    Vector2 size = new Vector2(rt.rect.size.x, rt.rect.size.y);
    return new Rect(topLeft, size);
}

发生了什么

'Overlapping' bool 立即变为 true.

'Overlapping' bool instantly changes to true.

矩形一返回为(示例)

X -7.5，Y 2.5宽 98.5，高 164.1667

X -7.5, Y 2.5W 98.5, H 164.1667

推荐答案

将 RectTransform 转换为 Rect 然后检查它是否重叠.

Convert the RectTransform to Rect then check if it overlaps.

这是一个可以做到这一点的简单函数:

Here is a simple function that can do that:

bool rectOverlaps(RectTransform rectTrans1, RectTransform rectTrans2)
{
    Rect rect1 = new Rect(rectTrans1.localPosition.x, rectTrans1.localPosition.y, rectTrans1.rect.width, rectTrans1.rect.height);
    Rect rect2 = new Rect(rectTrans2.localPosition.x, rectTrans2.localPosition.y, rectTrans2.rect.width, rectTrans2.rect.height);

    return rect1.Overlaps(rect2);
}

用法:

public RectTransform uiRect1;
public RectTransform uiRect2;

void Update()
{
    if (rectOverlaps(uiRect1, uiRect2))
    {
        Debug.Log("Overlaps");
    }else
    {
        Debug.Log("Does not Overlap");
    }
}

更好的是，让它成为一个扩展方法:

Even better, make it an extension method:

public static class ExtensionMethod
{
    public static bool rectOverlaps(this RectTransform rectTrans1, RectTransform rectTrans2)
    {
        Rect rect1 = new Rect(rectTrans1.localPosition.x, rectTrans1.localPosition.y, rectTrans1.rect.width, rectTrans1.rect.height);
        Rect rect2 = new Rect(rectTrans2.localPosition.x, rectTrans2.localPosition.y, rectTrans2.rect.width, rectTrans2.rect.height);

        return rect1.Overlaps(rect2);
    }
}

现在你可以了

public RectTransform uiRect1;
public RectTransform uiRect2;

void Update()
{
    if (uiRect1.rectOverlaps(uiRect2))
    {

    }

    //OR

    if (uiRect2.rectOverlaps(uiRect1))
    {

    }
}

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