unity代码怎么实现鼠标绘制矩形并且被框选的物体变色
时间: 2024-03-11 18:48:10 浏览: 148
实现鼠标绘制矩形的方法可以参考以下代码:
```csharp
public class DrawRectangle : MonoBehaviour
{
private Vector2 startPosition;
private Vector2 endPosition;
private bool isDrawing;
private void Update()
{
if (Input.GetMouseButtonDown(0))
{
startPosition = Input.mousePosition;
isDrawing = true;
}
else if (Input.GetMouseButtonUp(0))
{
isDrawing = false;
// 在这里获取框选的物体并改变颜色
ChangeSelectedObjectsColor();
}
if (isDrawing)
{
endPosition = Input.mousePosition;
}
}
private void OnGUI()
{
if (isDrawing)
{
Rect rect = new Rect(startPosition.x, Screen.height - startPosition.y,
endPosition.x - startPosition.x, -(endPosition.y - startPosition.y));
GUI.Box(rect, "");
}
}
private void ChangeSelectedObjectsColor()
{
// 获取屏幕坐标系下的开始点和结束点
Vector2 screenStartPosition = Camera.main.ScreenToWorldPoint(startPosition);
Vector2 screenEndPosition = Camera.main.ScreenToWorldPoint(endPosition);
// 获取框选区域的边界框
Bounds selectionBounds = new Bounds((screenStartPosition + screenEndPosition) / 2f,
new Vector3(Mathf.Abs(screenEndPosition.x - screenStartPosition.x),
Mathf.Abs(screenEndPosition.y - screenStartPosition.y), 1f));
// 获取所有被框选的物体
Collider2D[] selectedColliders = Physics2D.OverlapBoxAll(selectionBounds.center,
selectionBounds.size, 0f);
// 改变被框选物体的颜色
foreach (Collider2D selectedCollider in selectedColliders)
{
selectedCollider.GetComponent<Renderer>().material.color = Color.red;
}
}
}
```
上述代码中,首先通过监听鼠标左键按下和抬起的事件来获取框选的起点和终点,然后通过 OnGUI() 函数来绘制矩形框。在鼠标左键抬起的事件中,通过获取框选区域的边界框来获取所有被框选的物体,然后将它们的颜色改变为红色即可。注意,在获取框选区域的边界框时需要将屏幕坐标系转换为世界坐标系。
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