Question

unity3D 鼠标点击拖动画线

var myColor:Color;

var firstPosition:Vector3;
var secondPosition:Vector3;
var middlePosition:Vector3;

var isClicked:boolean=false;

private var lineRenderer:LineRenderer;

function Start()
{
lineRenderer=gameObject.AddComponent(LineRenderer);
lineRenderer.material.color=myColor;
lineRenderer.SetWidth(0.1,0.1);

}

function Update()
{
var isMouseDown:boolean=Input.GetMouseButton(0);

if(isMouseDown &&!isClicked)
{
firstPosition=new Vector3(Input.mousePosition.x,Input.mousePositon.y,1);
lineRenderer.SetVertexCount(1);
lineRenderer.enabled=true;
lineRenderer.SetPosition(0,firstPosition);
isClicked=false;

}
else if(isMouseDown)
{
secondPosition=new Vector3(Input.mousePosition.x,Input.mousePositon.y,1);
lineRenderer.SetVertexCount(2);

lineRenderer.SetPosition(1,secondPosition);
}

if(Input.GetMouseButtonUp(0))
{
isClicked=false;
secondPosition=new Vector3(Input.mousePosition.x,Input.mousePositon.y,1);
lineRenderer.SetVertexCount(2);

lineRenderer.SetPosition(1,secondPosition);
}
}

这是我的代码，我估计是Update那里的点坐标没有记录下来。。可是不知道是不是……

Answer 1

using UnityEngine;
using System.Collections;
public class Test : MonoBehaviour
{
public Material mat;
public Color color = Color.red;
public Vector3 pos1;
public Vector3 pos2;
public bool isReady = false;

void Start()
{
mat.color = color;
}

void Update()
{
if (Input.GetMouseButtonDown(0))
{
pos1 = Input.mousePosition;
}
if (Input.GetMouseButtonUp(0))
{
pos2 = Input.mousePosition;
isReady = true;
}
}

void OnPostRender()
{
if (isReady)
{
GL.PushMatrix();
mat.SetPass(0);
GL.LoadOrtho();
GL.Begin(GL.LINES);
GL.Color(color);
GL.Vertex3(pos1.x/Screen.width, pos1.y/Screen.height, pos1.z);
GL.Vertex3(pos2.x / Screen.width, pos2.y / Screen.height, pos2.z);
GL.End();
GL.PopMatrix();
}
}
}

希望能够帮到你