HandleUtility.DistanceToCone

参数

返回

float Distance from mouse to cone in pixels.

描述

Returns the distance in pixels from the mouse pointer to a cone.

Calculates the screen space distance from the mouse pointer to a cone at given world space position with the given rotation and size.

Returns zero when mouse pointer is directly over the cone.

使用当前摄像机确定距离。

using UnityEngine;
using UnityEditor;

public class ExampleScript : MonoBehaviour
{
}

// Displays cone in scene view, and distance from mouse
// to the cone.
[CustomEditor(typeof(ExampleScript))]
public class ExampleEditor : Editor
{
    public void OnSceneGUI()
    {
        var t = target as ExampleScript;
        var tr = t.transform;
        var position = tr.position;
        var rotation = tr.rotation;
        var size = 1.0f;
        // draw a cone in scene
        Handles.color = Color.yellow;
        Handles.ConeHandleCap(0, position, rotation, size, Event.current.type);
        // calculate distance from mouse to cone, and display it
        var distance = HandleUtility.DistanceToCone(position, rotation, size);
        GUI.color = Color.black;
        Handles.Label(position, distance.ToString("F0"));
        // make scene view repaint on mouse move
        if (Event.current.type == EventType.MouseMove)
            Event.current.Use();
    }
}

.

See Also: DistanceToCircle, DistanceToCube, DistanceToLine.