【Unity3D自学记录】Unity中的物体缩放-Android和PC平台

在本文中缩放的是NGUI的Texture对象：

在一个有Collider的可以控制Texture的对象上添加如下脚本即可：


Texture是此对象的子物体，即ScaleDragTexture组件中的Image对象。

using UnityEngine;

public class ScaleDragTexture : MonoBehaviour
{
public Transform uitexture;
//当触屏点超过1个时，对图片进行放大和缩小，最小缩放比例为图片加载时大小
private float newdis; //两个手指之间的距离
private float olddis;
private float minScale = 1.0f; //放大比例
private float maxScale = 2.0f;
private float curScale = 1.0f;
private Vector3 uitextureDefaultScale;
private Vector3 uitextureCurScale;

void Update()
{
if (Application.platform == RuntimePlatform.Android)
{
//物体的缩放
if (Input.touchCount > 1)
{
this.GetComponent<UIDragObject>().enabled = false; //将DragObject脚本设置为不可用，来控制缩放的时候不进行拖拽
if (uitextureDefaultScale != this.GetComponent<UpdateImage>().uitextureDefaultScale)
{//获取图片未被拖拽时（默认状态）的缩放值
uitextureDefaultScale = uitextureCurScale = this.GetComponent<UpdateImage>().uitextureDefaultScale;
}
if (Input.GetTouch(0).phase == TouchPhase.Moved || Input.GetTouch(1).phase == TouchPhase.Moved)
{
var pos1 = Input.GetTouch(0).position;
var pos2 = Input.GetTouch(1).position;
newdis = Vector2.Distance(pos1, pos2);//获取两个触击点的距离
curScale = uitextureCurScale.x / uitextureDefaultScale.x; //获取当前的缩放比例值
if (newdis < olddis)
{//比例缩小
if (curScale > maxScale || curScale > minScale)
uitexture.localScale -= uitextureDefaultScale * Time.deltaTime;
}
if (newdis > olddis)
{//比例放大
if (curScale <= maxScale)
uitexture.localScale += uitextureDefaultScale * Time.deltaTime;
}
if (curScale < minScale)
{//当前比例小于最小值时恢复到默认缩放值
uitexture.localScale = uitextureDefaultScale;
}
uitextureCurScale = uitexture.localScale;
olddis = newdis;
}
if (curScale == minScale)
{//图片未进行缩放时，只有Y轴上可以被拖动
this.GetComponent<UIDragObject>().scale = new Vector3(0, 1, 0);
}
else
{//当图片缩放后，在X、Y轴上可以被拖动
this.GetComponent<UIDragObject>().scale = new Vector3(1, 1, 0);
}
}
else if (Input.touchCount == 1)
{
this.GetComponent<UIDragObject>().enabled = true; //将DragObject脚本设置为可用
}
}

else
{
if (Input.GetMouseButton(2)) //鼠标中键
{
this.GetComponent<UIDragObject>().enabled = false; //将DragObject脚本设置为不可用，来控制缩放的时候不进行拖拽

if (uitextureDefaultScale != this.GetComponent<UpdateImage>().uitextureDefaultScale)
{//获取图片未进行缩放时的Scale值
uitextureDefaultScale = uitextureCurScale = this.GetComponent<UpdateImage>().uitextureDefaultScale;
}
curScale = uitextureCurScale.x / uitextureDefaultScale.x; //获取当前的缩放比例值
if (Input.GetAxis("Mouse ScrollWheel") < 0)
{//比例放大
if (curScale <= maxScale)
uitexture.localScale += uitextureDefaultScale * Time.deltaTime;
}
else if (Input.GetAxis("Mouse ScrollWheel") > 0)
{//比例缩小
if (curScale > minScale || curScale > maxScale)
uitexture.localScale -= uitextureDefaultScale * Time.deltaTime;
}
if (uitexture.localScale.x < uitextureDefaultScale.x)
{//当缩放的值小于默认值时，恢复到默认值
uitexture.localScale = uitextureDefaultScale;
}
uitextureCurScale = uitexture.localScale;
if (curScale == minScale)
{//默认未进行缩放时只有Y轴上可以被拖动
this.GetComponent<UIDragObject>().scale = new Vector3(0, 1, 0);
}
else
{//缩放之后X、Y轴上可以被拖动
this.GetComponent<UIDragObject>().scale = new Vector3(1, 1, 0);
}
}
else if (Input.GetMouseButtonDown(0))
{
this.GetComponent<UIDragObject>().enabled = true; //将DragObject脚本设置为可用
}
}
}
}