我要评论本文实例为大家分享了unity实现车方向盘转动效果的具体代码，供大家参考，具体内容如下
效果：
c#脚本如下：
using system;
using system.collections;
using system.collections.generic;
using unityengine;
using unityengine.eventsystems;
public class newbehaviourscript : monobehaviour, idraghandler,ibegindraghandler,ienddraghandler
{
/// <summary>
/// 需要旋转的模型
/// </summary>
public transform model;
/// <summary>
/// 父物体的recttransform
/// </summary>
public recttransform parentrect;
/// <summary>
/// 旋转的ui
/// </summary>
public recttransform img;
/// <summary>
/// 摄像机
/// </summary>
public camera cam;
/// <summary>
/// 是否在拖拽
/// </summary>
private bool drag = false;
/// <summary>
/// 初始角度
/// </summary>
private float originangle = 0;
/// <summary>
/// 自身角度
/// </summary>
private float selfangle1 = 0;
/// <summary>
/// 上一次和当前的角度
/// </summary>
private float lastangle = 0f;
private float currentangle = 0f;
/// <summary>
/// 上一次和当前的位置
/// </summary>
private vector2 currentpos;
private vector2 lastpos;
public void onbegindrag(pointereventdata eventdata)
{
drag = true;
originangle = getangle(eventdata.position);
selfangle1 = (img.transform as recttransform).eulerangles.z;
}
public void ondrag(pointereventdata eventdata)
{
if (drag)
{
lastangle = currentangle;
currentangle = getangle(eventdata.position);
float val = touchjudge(currentpos, ref lastpos, vector2.zero);
if (val > 0f && val <180f)
{
img.eulerangles = new vector3(0f,0f, -currentangle + originangle + selfangle1);
model.eulerangles = new vector3(0f, 0f, -currentangle + originangle + selfangle1);
}
}
}
public void onenddrag(pointereventdata eventdata)
{
drag = false;
}
/// <summary>
/// 将屏幕坐标转成ui坐标
/// </summary>
/// <param name="pos1"></param>
/// <returns></returns>
float getangle(vector2 pos1) {
vector2 pos;
recttransformutility.screenpointtolocalpointinrectangle(parentrect, pos1, cam, out pos);
currentpos = pos;
return mathf.atan2(pos.x, pos.y) * mathf.rad2deg;
}
/// <summary>
/// 判断顺时针还是逆时针旋转
/// </summary>
/// <param name="current"></param>
/// <param name="last"></param>
/// <param name="anchor"></param>
/// <returns></returns>
private float touchjudge(vector2 current, ref vector2 last, vector2 anchor)
{
vector2 lastdir = (last - anchor).normalized;
vector2 currentdir = (current - anchor).normalized;
float lastdot = vector2.dot(vector2.right, lastdir);
float currentdot = vector2.dot(vector2.right, currentdir);
float lastangle = last.y < anchor.y
? mathf.acos(lastdot) * mathf.rad2deg
: -mathf.acos(lastdot) * mathf.rad2deg;
float currentangle = current.y < anchor.y
? mathf.acos(currentdot) * mathf.rad2deg
: -mathf.acos(currentdot) * mathf.rad2deg;
last = current;
return currentangle - lastangle;
}
}
canvas设置如下：
脚本赋值如下：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。
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