Unity3D笔记 切水果二 刀光剑影

一、步骤一创建一个空GameObject、js

二、代码

#pragma strict
var myColor:Color;
var firstPosition:Vector3;//鼠标点击的第一个点
var secondPosition:Vector3;//鼠标放开的位置
var middlePosition:Vector3;
var isClick:boolean=false;
private var lineRenderer:LineRenderer;

function Start () {
    lineRenderer=gameObject.AddComponent(LineRenderer);
    lineRenderer.material.color=myColor;
    lineRenderer.SetWidth(0.1,0.1);//设置宽度 起点宽度和终点宽度 function SetWidth (start : float, end : float) : void
}

function Update () {
    var isMouseDown=Input.GetMouseButton(0);//获取按钮
    if(isMouseDown&&!isClick){
        firstPosition=Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x,Input.mousePosition.y,1));
        lineRenderer.SetVertexCount(1);//设置线段数
        lineRenderer.enabled=true;
        lineRenderer.SetPosition(0,firstPosition);
        isClick=true;
    }
    if(isMouseDown){
        secondPosition=Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x,Input.mousePosition.y,1));
        lineRenderer.SetVertexCount(2);
        lineRenderer.SetPosition(1,secondPosition);
    }
    if(Input.GetMouseButtonUp(0)){
        isClick=false;
        secondPosition=Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x,Input.mousePosition.y,1));
        lineRenderer.SetVertexCount(2);
        lineRenderer.SetPosition(1,secondPosition);
    }
}

三、实现划线功能

四、实现刀光剑影

编辑好位置

调用刀光剑影

最终代码

#pragma strict
//var myColor:Color;
var firstPosition:Vector3;//鼠标点击的第一个点
var secondPosition:Vector3;//鼠标放开的位置
var middlePosition:Vector3;
var isClick:boolean=false;

var myRay:GameObject;
private var rayGameObject:GameObject;

//private var lineRenderer:LineRenderer;

//function Start () {
//    lineRenderer=gameObject.AddComponent(LineRenderer);
//    lineRenderer.material.color=myColor;
//    lineRenderer.SetWidth(0.1,0.1);//设置宽度 起点宽度和终点宽度 function SetWidth (start : float, end : float) : void
//}

function Update () {
    var isMouseDown=Input.GetMouseButton(0);//获取按钮
    if(isMouseDown&&!isClick){
        firstPosition=Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x,Input.mousePosition.y,1));
        //lineRenderer.SetVertexCount(1);//设置线段数
        //lineRenderer.enabled=true;
        //lineRenderer.SetPosition(0,firstPosition);
        isClick=true;
    }
    if(isMouseDown){
        secondPosition=Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x,Input.mousePosition.y,1));
        //lineRenderer.SetVertexCount(2);
        //lineRenderer.SetPosition(1,secondPosition);
    }
    if(Input.GetMouseButtonUp(0)){
        isClick=false;
        secondPosition=Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x,Input.mousePosition.y,1));
        //lineRenderer.SetVertexCount(2);
        //lineRenderer.SetPosition(1,secondPosition);

        middlePosition=(firstPosition+secondPosition)/2.0;
        var angle:float=Mathf.Atan((secondPosition.y-firstPosition.y)/(secondPosition.x-firstPosition.x));
        rayGameObject=Instantiate(myRay,middlePosition,Quaternion.AngleAxis(angle*100/3.14,Vector3.forward));
        Destroy(rayGameObject,1.0);
    }

}