Unity UGUI 螢幕座標轉換

unity的recttransformutility函式裡面提供了常用的座標系之間的轉換關係。

因為recttransformutility裡面提供的函式是環形結構，所以螢幕座標，ugui座標，世界座標三者之間可以相互轉換。

由於函式都需要用到場景相機和ugui相機，所以定義兩個相機變數。

/// /// 場景相機

/// 
public static camera scencecamera;
/// /// ugui相機
/// 
public static camera uguicamera;

worldtoscreenpoint

/// /// 世界座標轉螢幕座標

/// 
/// 
/// 
public static vector2 worldtoscreenpoint(vector3 worldpoint)
/// /// 世界座標轉螢幕座標
/// 
/// 
/// 
/// 
public static vector2 worldtoscreenpoint(camera cam, vector3 worldpoint)

screenpointtoworldpointinrectangle

/// /// 螢幕座標轉世界座標

/// 
/// 
/// 
/// 
/// 
public static bool screenpointtoworldpointinrectangle(recttransform rect, vector2 screenpoint, out vector3 worldpoint)
/// /// 螢幕座標轉世界座標
/// 
/// 
/// 
/// 
/// 
/// 
public static bool screenpointtoworldpointinrectangle(recttransform rect, vector2 screenpoint, camera cam, out vector3 worldpoint)

screenpointtolocalpointinrectangle

/// /// 螢幕座標轉某個recttransform下的localposition座標

/// 
/// 
/// 
/// 
/// 
public static bool screenpointtolocalpointinrectangle(recttransform rect, vector2 screenpoint, out vector2 localpoint)
/// /// 螢幕座標轉某個recttransform下的localposition座標
/// 
/// 
/// 
/// 
/// 
/// 
public static bool screenpointtolocalpointinrectangle(recttransform rect, vector2 screenpoint, camera cam, out vector2 localpoint)

ugui座標->世界座標->螢幕座標

世界座標->螢幕座標-> ugui座標

using unityengine;

public class transformutility
/// /// 世界座標轉螢幕座標
/// 
/// 
/// 
/// 
public static vector2 worldtoscreenpoint(camera cam, vector3 worldpoint)
#endregion
#region 螢幕座標轉世界座標
/// /// 螢幕座標轉世界座標
/// 
/// 
/// 
/// 
/// 
public static bool screenpointtoworldpointinrectangle(recttransform rect, vector2 screenpoint, out vector3 worldpoint)
/// /// 螢幕座標轉世界座標
/// 
/// 
/// 
/// 
/// 
/// 
public static bool screenpointtoworldpointinrectangle(recttransform rect, vector2 screenpoint, camera cam, out vector3 worldpoint)
#endregion
#region 螢幕座標轉ugui座標
/// /// 螢幕座標轉某個recttransform下的localposition座標
/// 
/// 
/// 
/// 
/// 
public static bool screenpointtolocalpointinrectangle(recttransform rect, vector2 screenpoint, out vector2 localpoint)
/// /// 螢幕座標轉某個recttransform下的localposition座標
/// 
/// 
/// 
/// 
/// 
/// 
public static bool screenpointtolocalpointinrectangle(recttransform rect, vector2 screenpoint, camera cam, out vector2 localpoint)
#endregion
}

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