Unity-WIKI 之 DebugLine

脚本功能

在Unity中要使用画线功能，需要添加LineRenderer 组件，或打开Gizmos功能，下面这个组件为开发带来了方便

功能预览

搭建步骤

1、创建“Plugins” 文件夹

2、在“Plugins”中创建"DebugLine.cs"

3、提供两个方法：DrawLine() or DebugLine.DrawRay()

注意:场景中必须有一个相机的tag是MainCamera

组件源码

using UnityEngine;

using System.Collections;

public class UseDebugLine : MonoBehaviour {

    // Use this for initialization

    void Start () {

        DebugLine.DrawLine(new Vector3(0, 0, 0), new Vector3(5, 5, -5), Color.cyan, 4, 2);

    }

    // Update is called once per frame

    void Update () {

        DebugLine.DrawRay(transform.position, transform.forward * 10, Color.blue);

        DebugLine.DrawRay(transform.position, transform.up * 10, Color.green);

        DebugLine.DrawRay(transform.position, transform.right * 10, Color.red);

    }

}

DebugLine.cs

/* Author: Spencer Evans

 *

 * Description:

 * DebugLine.cs provides 2 useful functions for debugging : DrawLine and DrawRay. These functions are almost identical to those provided in the Unity 3D

 * engine Debug class (http://docs.unity3d.com/Documentation/ScriptReference/Debug.html), except in the following ways:

 * 1. The lines are drawn in the Game window, not the Scene editor window.

 * 2. A "width" option is provided - allowing the user to choose the width in pixels of the line drawn.

 * 3. The "depthTest" parameter in the Debug.DrawLine() and Debug.DrawRay() functions is unavailable; all lines are obscured by objects closer to the camera.

 *

 * Usage:

 * 1. Create a new folder titled "Plugins", and move it to your project's "/Assets" folder (if you haven't already).

 * 2. Create and place "DebugLine.cs" inside the "/Plugins" folder.

 * 3. Call the DebugLine.DrawLine() or DebugLine.DrawRay() functions just as you would with the Debug class.

 *

 * Notes:

 * 1. You must have a Camera in your scene tagged "MainCamera" for these debug functions to work properly.

 * 2. You do NOT need Unity Pro for this to work.

 */

using UnityEngine;

using System.Collections;

public class DebugLine : MonoBehaviour

{

    //used to make calls from both Update and FixedUpdate function properly

    public float destroy_time = float.MaxValue;

    public float fixed_destroy_time = float.MaxValue;

    //draw ray functions - http://docs.unity3d.com/Documentation/ScriptReference/Debug.DrawRay.html

    public static void DrawRay(Vector3 start, Vector3 dir)

    {

        DebugLine.DrawLine(start, start + dir, Color.white);

    }

    public static void DrawRay(Vector3 start, Vector3 dir, Color color, float duration = 0, float width = 1)

    {

        DebugLine.DrawLine(start, start + dir, color, duration, width);

    }

    //draw line functions - http://docs.unity3d.com/Documentation/ScriptReference/Debug.DrawLine.html

    public static void DrawLine(Vector3 start, Vector3 end)

    {

        DebugLine.DrawLine(start, end, Color.white);

    }

    public static void DrawLine(Vector3 start, Vector3 end, Color color, float duration = 0, float width = 1)

    {

        //early out if there is no Camera.main to calculate the width

        if (!Camera.main)

            return;

        GameObject line = new GameObject("debug_line");

        //set the params of the line renderer - http://docs.unity3d.com/Documentation/ScriptReference/LineRenderer.html

        LineRenderer lineRenderer = line.AddComponent<LineRenderer>();

        lineRenderer.material = new Material(Shader.Find("Mobile/Particles/Additive"));

        lineRenderer.SetPosition( 0, start );

        lineRenderer.SetPosition( 1, end );

        lineRenderer.SetColors( color, color );

        lineRenderer.SetWidth( DebugLine.CalcPixelHeightAtDist( (start - Camera.main.transform.position).magnitude) * width,

                               DebugLine.CalcPixelHeightAtDist( (end - Camera.main.transform.position).magnitude) * width    );

        //add the MonoBehaviour instance

        DebugLine debugLine = line.AddComponent<DebugLine>();

        //set the time to expire - default is 0 (will only draw for one update cycle)

        //use Update or FixedUpdate depending on the time of the invoking call

        if (Time.deltaTime == Time.fixedDeltaTime)

            debugLine.fixed_destroy_time = Time.fixedTime + duration;

        else    debugLine.destroy_time = Time.time + duration;

    }

    //utility function to calculate the world height of a single pixel given the following info:

    // - Camera.main.fov

    // - Camera.main.pixelHeight

    // - distance to the camera

    public static float CalcPixelHeightAtDist(float dist)

    {

        //early out if there is no Camera.main to calculate the width

        if (!Camera.main)

            return 0;

        //http://docs.unity3d.com/Documentation/Manual/FrustumSizeAtDistance.html

        float frustumHeight = 2 * dist * Mathf.Tan(Camera.main.fieldOfView * 0.5f * Mathf.Deg2Rad);

        return frustumHeight / Camera.main.pixelHeight;

    }

    //check to see if should be destroyed yet

    public void Update ()

    {

        if (Time.time > destroy_time)

            Destroy(transform.gameObject);

    }

    public void FixedUpdate ()

    {

        if (Time.fixedTime > fixed_destroy_time)

            Destroy(transform.gameObject);

    }

}

巴特西

Unity-WIKI 之 DebugLine

脚本功能

功能预览

搭建步骤

组件源码

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