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| using UnityEngine;
using System.Collections;
public class MouseMoveCube : MonoBehaviour {
private void Start()
{
StartCoroutine(OnMouseDown());
}
private void Update()
{
ZoomCube();
}
private void ZoomCube()
{
//projection:投射方式
//zoom out
if (Input.GetAxis("Mouse ScrollWheel") < 0)
{
//Perspective：透视
if (Camera.main.fieldOfView <= 80)
{
Camera.main.fieldOfView += 2;
}
//Orthographic：正交
if (Camera.main.orthographicSize <= 18)
{
Camera.main.orthographicSize += 0.5f;
}
}
//zoom in
if (Input.GetAxis("Mouse ScrollWheel") > 0)
{
if (Camera.main.fieldOfView >= 2)
{
Camera.main.fieldOfView -= 2;
}
if (Camera.main.orthographicSize >= 1)
{
Camera.main.orthographicSize -= 0.5f;
}
}
}
IEnumerator OnMouseDown()
{
//将物体由世界坐标系转换为屏幕坐标系
Vector3 screenPostion = Camera.main.WorldToScreenPoint(transform.position);
//将鼠标屏幕坐标转为三维坐标，再算出物体位置与鼠标之间的距离(offset)
Vector3 offset = transform.position-Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y,
screenPostion.z));
while( Input.GetMouseButton(0) )
{
//当前鼠标位置
Vector3 curMousePostion = new Vector3(Input.mousePosition.x, Input.mousePosition.y,
screenPostion.z);
//将鼠标位置转换为世界位置，加上偏移量
Vector3 curPosition = Camera.main.ScreenToWorldPoint(curMousePostion) + offset;
//将当前位置赋给世界物体的位置
transform.position = curPosition;
yield return new WaitForFixedUpdate();//循环
}
}
}
|