Handles.DrawWireArc

参数

描述

在3D空间中绘制圆弧。

Handles.color 和 Handles.matrix 属性可以对弧线颜色进行着色并对其位置进行额外变换。当当前GUI事件类型不是 Repaint 时，Unity 会忽略 DrawWireArc（即，不会发生任何事情）。


场景视图中的线框弧线。

using UnityEditor;
using UnityEngine;
using System.Collections;

//this class should exist somewhere in your project
public class WireArcExample : MonoBehaviour
{
    public float shieldArea;
}

// Create a 180 degrees wire arc with a ScaleValueHandle attached to the disc
// that lets you modify the "shieldArea" value in the WireArcExample
[CustomEditor(typeof(WireArcExample))]
public class DrawWireArc : Editor
{
    void OnSceneGUI()
    {
        Handles.color = Color.red;
        WireArcExample myObj = (WireArcExample)target;
        Handles.DrawWireArc(myObj.transform.position, myObj.transform.up, -myObj.transform.right, 180, myObj.shieldArea);
        myObj.shieldArea = (float)Handles.ScaleValueHandle(myObj.shieldArea, myObj.transform.position + myObj.transform.forward * myObj.shieldArea, myObj.transform.rotation, 1, Handles.ConeHandleCap, 1);
    }
}

您可以使用 HandleUtility.GetHandleSize 计算操纵器手柄的合适尺寸。

弧线 thickness 可以选择性地设置。零粗细绘制一条像素线条。较大的粗细值表示线条粗细，以UI点为单位。例如，如果显示缩放比例为200%，则粗细为1.0的线条在屏幕上可能宽两个像素（参见 EditorGUIUtility.pixelsPerPoint）。


不同粗细的弧线。

using UnityEngine;
using UnityEditor;

public class ExampleScript : MonoBehaviour
{
}

// Display arcs of various angles and thickness in the scene view
[CustomEditor(typeof(ExampleScript))]
public class ExampleEditor : Editor
{
    public void OnSceneGUI()
    {
        var t = target as ExampleScript;
        var tr = t.transform;
        var position = tr.position;
        Handles.color = Color.yellow;
        for (int i = 0; i < 10; ++i)
        {
            var center = position;
            var start = Vector3.left;
            var normal = Vector3.forward;
            var radius = 3 - i * 0.3f;
            var angle = 40 + 30 * i;
            Handles.DrawWireArc(center, normal, start, angle, radius, i);
        }
    }
}

其他资源：Handles.lineThickness、Handles.DrawLine、Handles.DrawSolidArc、Handles.DrawWireDisc。