diff --git a/include/ZE_ZConfigFile.h b/include/ZE_ZConfigFile.h
index e0a1e09..18e4201 100644
--- a/include/ZE_ZConfigFile.h
+++ b/include/ZE_ZConfigFile.h
@@ -13,7 +13,7 @@
 File: Types/ZE_ZConfigFile.h <br>
 Description: Header file for ZEngine INI-Style Config Files.<br>
 Author(s): James Turk <br>
-$Id: ZE_ZConfigFile.h,v 1.5 2002/12/29 06:50:19 cozman Exp $<br>
+$Id: ZE_ZConfigFile.h,v 1.6 2003/01/16 05:46:39 cozman Exp $<br>
 
     \file ZE_ZConfigFile.h
     \brief Definition file for ZConfigFile.
@@ -84,7 +84,7 @@ class ZConfigFile : public ZObject
             \param str The string to get a clean version of.
             \return Cleaned string.
         **/
-        string CleanString(string str);
+        string CleanString(string str)  const;
         
         /*!
             \brief Check if a section exists.
@@ -93,7 +93,7 @@ class ZConfigFile : public ZObject
             \param sec Section to check for.
             \return bool, true if section exists in file.
         **/
-        bool Exists(string sec);
+        bool Exists(string sec) const;
 
         /*!
             \brief Check if a variable exists.
@@ -103,7 +103,7 @@ class ZConfigFile : public ZObject
             \param var Variable to check for.
             \return bool, true if section exists in file.
         **/
-        bool Exists(string sec, string var);
+        bool Exists(string sec, string var) const;
 
         /*!
             \brief Internal function to set variables.
@@ -124,7 +124,7 @@ class ZConfigFile : public ZObject
             \param defVal Value to return if variable doesnt exist.
             \return Value of variable.
         **/
-        string GetVariable(string sec, string var, string defVal);
+        string GetVariable(string sec, string var, string defVal) const;
 
     public:
 
@@ -167,7 +167,7 @@ class ZConfigFile : public ZObject
             \param defVal Value to return if var does not exist within section.
             \return Contents of the variable in integer format.
         **/
-        int GetInt(string section, string var, int defVal);
+        int GetInt(string section, string var, int defVal) const;
 
         /*!
             \brief Get value in boolean format from file.
@@ -179,7 +179,7 @@ class ZConfigFile : public ZObject
             \param defVal Value to return if var does not exist within section.
             \return Contents of the variable in boolean format.
         **/
-        bool GetBool(string section, string var, bool defVal);
+        bool GetBool(string section, string var, bool defVal) const;
 
         /*!
             \brief Get value in string format from file.
@@ -190,7 +190,7 @@ class ZConfigFile : public ZObject
             \param defVal Value to return if var does not exist within section.
             \return Contents of the variable in string format.
         **/
-        string GetString(string section, string var, string defVal);
+        string GetString(string section, string var, string defVal) const;
 
         /*!
             \brief Set value in integer format in file.
diff --git a/include/ZE_ZError.h b/include/ZE_ZError.h
index f188552..b11cb49 100755
--- a/include/ZE_ZError.h
+++ b/include/ZE_ZError.h
@@ -13,7 +13,7 @@
 File: ZE_ZError.h <br>
 Description: Header file for ZEngine Error Object. <br>
 Author(s): James Turk <br>
-$Id: ZE_ZError.h,v 1.3 2003/01/16 05:06:54 cozman Exp $<br>
+$Id: ZE_ZError.h,v 1.4 2003/01/16 05:46:39 cozman Exp $<br>
 
     \file ZE_ZError.h
     \brief Definition file for ZError.
@@ -109,14 +109,14 @@ class ZError
             Access ZErrorCode of the ZError object.
             \return The error ZErrorCode.
         **/
-        ZErrorCode Code();
+        ZErrorCode Code() const;
 
         /*!
             \brief Get formatted string for log file.
 
             Return the string to be written to the logfile.  Called by ZEngine in LogError.
         **/
-        string LogString();
+        string LogString() const;
 };
 
 }
diff --git a/include/ZE_ZFont.h b/include/ZE_ZFont.h
index 0606af9..1ae234d 100644
--- a/include/ZE_ZFont.h
+++ b/include/ZE_ZFont.h
@@ -13,7 +13,7 @@
 File: ZE_ZFont.h <br>
 Description: Header file for core ZEngine Font Object. <br>
 Author(s): James Turk <br>
-$Id: ZE_ZFont.h,v 1.3 2002/12/29 06:50:19 cozman Exp $<br>
+$Id: ZE_ZFont.h,v 1.4 2003/01/16 05:46:39 cozman Exp $<br>
 
     \file ZE_ZFont.h
     \brief Definition file for ZFont.
@@ -105,7 +105,7 @@ class ZFont : public ZObject
             \param text String to write.
             \param image ZImage to draw to.
         **/
-        void DrawText(string text, ZImage &image);
+        void DrawText(string text, ZImage &image) const;
 
         /*!
             \brief Draws a string with a colored background to a ZImage.
@@ -114,7 +114,7 @@ class ZFont : public ZObject
             \param text String to write.
             \param image ZImage to draw to.
         **/
-        void DrawShadedText(string text, ZImage &image);
+        void DrawShadedText(string text, ZImage &image) const;
 
         /*!
             \brief Set Text rColor.
@@ -164,7 +164,7 @@ class ZFont : public ZObject
             Check if file is loaded and pointer to data is non-NULL.
             \return Loaded or Unloaded state of data.
         **/
-        bool IsLoaded();
+        bool IsLoaded() const;
 
         /*!
             \brief Get Bold Setting.
@@ -172,7 +172,7 @@ class ZFont : public ZObject
             Check if font output is currently bold.
             \return True or False state of bold.
         **/
-        bool IsBold();
+        bool IsBold() const;
 
         /*!
             \brief Get Italic Setting.
@@ -180,7 +180,7 @@ class ZFont : public ZObject
             Check if font output is currently italic.
             \return True or False state of italic.
         **/
-        bool IsItalic();
+        bool IsItalic() const;
 
         /*!
             \brief Get Underlined Setting.
@@ -188,7 +188,7 @@ class ZFont : public ZObject
             Check if font output is currently underline.
             \return True or False state of underline.
         **/
-        bool IsUnderlined();
+        bool IsUnderlined() const;
 
         /*!
             \brief Get Height of Font.
@@ -196,7 +196,7 @@ class ZFont : public ZObject
             Check font height as reported by SDL_ttf.
             \return Height of font.
         **/
-        int Height();
+        int Height() const;
 
         /*!
             \brief Get Line Skip for Font.
@@ -204,7 +204,7 @@ class ZFont : public ZObject
             Check font line skip as reported by SDL_ttf.
             \return Recommended Line Skip of font.
         **/
-        int LineSkip();
+        int LineSkip() const;
 
         /*!
             \brief Get String Width.
@@ -213,7 +213,7 @@ class ZFont : public ZObject
             \param text String to get width of.
             \return Width of String in Current font.
         **/
-        int StringWidth(string text);
+        int StringWidth(string text) const;
 
         /*!
             \brief Get String Height.
@@ -222,7 +222,7 @@ class ZFont : public ZObject
             \param text String to get height of.
             \return Height of String in Current font.
         **/
-        int StringHeight(string text);
+        int StringHeight(string text) const;
 };
 
 }
diff --git a/include/ZE_ZImage.h b/include/ZE_ZImage.h
index 1cd78c5..0b5d7fd 100644
--- a/include/ZE_ZImage.h
+++ b/include/ZE_ZImage.h
@@ -13,7 +13,7 @@
 File: ZE_ZImage.h <br>
 Description: Header file for core ZEngine Image and Texture Object. <br>
 Author(s): James Turk, Gamer Tazar <br>
-$Id: ZE_ZImage.h,v 1.7 2002/12/29 07:22:02 cozman Exp $<br>
+$Id: ZE_ZImage.h,v 1.8 2003/01/16 05:46:39 cozman Exp $<br>
 
     \file ZE_ZImage.h
     \brief Definition file for ZImage.
@@ -193,7 +193,7 @@ class ZImage : public ZObject
             OpenGL related bind call, only available in case you want to bind image in 3D.
             Draw uses this but the average user should never need to call this.
         **/
-        void Bind();
+        void Bind() const;
 
         /*!
             \brief Draw Image to Screen.
@@ -202,7 +202,7 @@ class ZImage : public ZObject
             \param x X coord to draw Image to.
             \param y Y coord to draw Image to.
         **/
-        void Draw(float x, float y);
+        void Draw(float x, float y) const;
 
         /*!
             \brief Draw Image rotated to screen.
@@ -212,7 +212,7 @@ class ZImage : public ZObject
             \param y Y coord to draw Image to.
             \param angle Angle in degrees to rotate image.
         **/
-        void DrawRotated(int x, int y, float angle);
+        void DrawRotated(int x, int y, float angle) const;
 
         /////////////
         //Accessors//
@@ -224,14 +224,14 @@ class ZImage : public ZObject
             Check if surface is a valid GL texture. (does not detect surface loss)
             \return Loaded or Unloaded state of data.
         **/
-        bool IsLoaded();
+        bool IsLoaded() const;
 
         /*!
             \brief Get SDL_Surface.
             Get SDL_Surface pointer to actual image data.
             \return SDL_Surface* of rImage.
         **/
-        SDL_Surface *Surface();
+        SDL_Surface *Surface() const;
 
         /*!
             \brief Get Width.
@@ -239,7 +239,7 @@ class ZImage : public ZObject
             Get Current Width of Image.
             \return Image Width.
         **/
-        int Width();
+        int Width() const;
 
         /*!
             \brief Get Height.
@@ -247,7 +247,7 @@ class ZImage : public ZObject
             Get Current Height of Image.
             \return Image Height.
         **/
-        int Height();
+        int Height() const;
 };
 
 }
diff --git a/include/ZE_ZMusic.h b/include/ZE_ZMusic.h
index 1483944..f701292 100644
--- a/include/ZE_ZMusic.h
+++ b/include/ZE_ZMusic.h
@@ -13,7 +13,7 @@
 File: ZE_ZMusic.h <br>
 Description: Header file for core ZEngine Music Wrapper Object. <br>
 Author(s): James Turk <br>
-$Id: ZE_ZMusic.h,v 1.3 2002/12/29 06:50:19 cozman Exp $<br>
+$Id: ZE_ZMusic.h,v 1.4 2003/01/16 05:46:39 cozman Exp $<br>
 
     \file ZE_ZMusic.h
     \brief Definition file for ZMusic.
@@ -99,28 +99,28 @@ class ZMusic : public ZObject
             \param loopNum Number of times to loop song, defaults to zero.
             \param fadeTime Milliseconds to fade to full volume, defaults to zero for no fade.
         **/
-        void Play(int loopNum=0, int fadeTime=0);
+        void Play(int loopNum=0, int fadeTime=0) const;
 
         /*!
             \brief Pause music.
 
             Pause currently playing music.
         **/
-        void Pause();
+        void Pause() const;
 
         /*!
             \brief Unpause music.
 
             Unpause currently paused music.
         **/
-        void Unpause();
+        void Unpause() const;
 
         /*!
             \brief Rewind music.
 
             Rewind music to beginning.
         **/
-        void Rewind();
+        void Rewind() const;
 
         /*!
             \brief Stop music.
@@ -128,7 +128,7 @@ class ZMusic : public ZObject
             Stop currently playing music, if fadeTime is not zero, fade out over specified time.
             \param fadeTime Milliseconds to fade out over, defaults to zero for immediate stop.
         **/
-        void Stop(int fadeTime=0);
+        void Stop(int fadeTime=0) const;
 
         /*!
             \brief Change Volume.
@@ -148,7 +148,7 @@ class ZMusic : public ZObject
             Check if file is loaded and pointer to data is non-NULL.
             \return Loaded or Unloaded state of data.
         **/
-        bool IsLoaded();
+        bool IsLoaded() const;
 
         /*!
             \brief Check if music is Playing.
@@ -156,7 +156,7 @@ class ZMusic : public ZObject
             Check if music is playing, specifically if it is not stopped. (Paused state should be checked for by IsPaused)
             \return Playing / Not Playing State of Music.
         **/
-        bool IsPlaying();
+        bool IsPlaying() const;
 
         /*!
             \brief Check if music is Paused.
@@ -164,7 +164,7 @@ class ZMusic : public ZObject
             Check if music is "playing" but currently paused.
             \return Paused / Not Paused State of Music.
         **/
-        bool IsPaused();
+        bool IsPaused() const;
 
         /*!
             \brief Find Current Volume of Music.
@@ -172,7 +172,7 @@ class ZMusic : public ZObject
             Get current volume of music represented as a value from 0-128.
             \return Volume of music, 0-128.
         **/
-        int Volume();
+        int Volume() const;
 };
 
 
diff --git a/include/ZE_ZRect.h b/include/ZE_ZRect.h
index 6a93d3d..7322638 100644
--- a/include/ZE_ZRect.h
+++ b/include/ZE_ZRect.h
@@ -13,7 +13,7 @@
 File: ZE_ZRect.h <br>
 Description: Header file for core ZEngine Rectangle Object. <br>
 Author(s): James Turk <br>
-$Id: ZE_ZRect.h,v 1.4 2002/12/29 06:50:19 cozman Exp $<br>
+$Id: ZE_ZRect.h,v 1.5 2003/01/16 05:46:39 cozman Exp $<br>
 
     \file ZE_ZRect.h
     \brief Definition file for ZRect.
@@ -102,7 +102,7 @@ class ZRect
             \param blue Blue component of color (0-255).
             \param alpha Alpha component of color (0-255).
         **/
-        void Draw(Uint8 red, Uint8 green, Uint8 blue, Uint8 alpha=255);
+        void Draw(Uint8 red, Uint8 green, Uint8 blue, Uint8 alpha=255) const;
 
         /*!
             \brief Changes the location of the rectangle.
diff --git a/include/ZE_ZSound.h b/include/ZE_ZSound.h
index aa377a9..bf8e2ab 100644
--- a/include/ZE_ZSound.h
+++ b/include/ZE_ZSound.h
@@ -13,7 +13,7 @@
 File: ZE_ZSound.h <br>
 Description: Header file for core ZEngine Sound Wrapper Object. <br>
 Author(s): James Turk <br>
-$Id: ZE_ZSound.h,v 1.3 2002/12/29 06:50:19 cozman Exp $<br>
+$Id: ZE_ZSound.h,v 1.4 2003/01/16 05:46:39 cozman Exp $<br>
 
     \file ZE_ZSound.h
     \brief Definition file for ZSound.
@@ -108,14 +108,14 @@ class ZSound : public ZObject
 
             Pause currently playing sound.
         **/
-        void Pause();
+        void Pause() const;
 
         /*!
             \brief Unpause sound.
 
             Unpause currently playing sound.
         **/
-        void Unpause();
+        void Unpause() const;
 
         /*!
             \brief Stop sound.
@@ -123,7 +123,7 @@ class ZSound : public ZObject
             Stop currently playing sound, if fadeTime is not zero, fade out over specified time.
             \param fadeTime Milliseconds to fade out over, defaults to zero for immediate stop.
         **/
-        void Stop(int fadeTime=0);
+        void Stop(int fadeTime=0) const;
 
         /*!
             \brief Change Volume.
@@ -143,7 +143,7 @@ class ZSound : public ZObject
             Check if file is loaded and pointer to data is non-NULL.
             \return Loaded or Unloaded state of data.
         **/
-        bool IsLoaded();
+        bool IsLoaded() const;
 
         /*!
             \brief Check if sound is Playing.
@@ -151,7 +151,7 @@ class ZSound : public ZObject
             Check if sound is playing, specifically if it is not stopped. (Paused state should be checked for by IsPaused)
             \return Playing / Not Playing State of sound.
         **/
-        bool IsPlaying();
+        bool IsPlaying() const;
 
         /*!
             \brief Check if sound is Paused.
@@ -159,7 +159,7 @@ class ZSound : public ZObject
             Check if sound is "playing" but currently paused.
             \return Paused / Not Paused State of Sound.
         **/
-        bool IsPaused();
+        bool IsPaused() const;
 
         /*!
             \brief Find Current Volume of Sound Channel.
@@ -167,7 +167,7 @@ class ZSound : public ZObject
             Get current volume of sound channel represented as a value from 0-128.
             \return Volume of sound channel, 0-128.
         **/
-        int Volume();
+        int Volume() const;
 };
 
 
diff --git a/include/ZE_ZTimer.h b/include/ZE_ZTimer.h
index a0b934b..f212ecd 100644
--- a/include/ZE_ZTimer.h
+++ b/include/ZE_ZTimer.h
@@ -13,7 +13,7 @@
 File: ZE_ZTimer.h <br>
 Description: Header file for core ZEngine Timer Object. <br>
 Author(s): James Turk <br>
-$Id: ZE_ZTimer.h,v 1.3 2002/12/29 06:50:19 cozman Exp $<br>
+$Id: ZE_ZTimer.h,v 1.4 2003/01/16 05:46:39 cozman Exp $<br>
 
     \file ZE_ZTimer.h
     \brief Definition file for ZTimer.
@@ -52,7 +52,7 @@ class ZTimer : public ZObject
             Protected method to get time from whichever timer is parent.
             \return Time on parent timer.
         **/
-        Uint32 GetParentTime();
+        Uint32 GetParentTime() const;
 
     public:
 
@@ -91,7 +91,7 @@ class ZTimer : public ZObject
             Get current time accounting for time paused.
             \return Current Timer Time.
         **/
-        Uint32 GetTime();
+        Uint32 GetTime() const;
 
         /*!
             \brief Get paused state.
@@ -99,7 +99,7 @@ class ZTimer : public ZObject
             Find out paused state of timer.
             \return Paused state for timer.
         **/
-        bool IsPaused();
+        bool IsPaused() const;
 };
 
 }
diff --git a/src/ZE_ZConfigFile.cpp b/src/ZE_ZConfigFile.cpp
index 941a268..9c14afb 100644
--- a/src/ZE_ZConfigFile.cpp
+++ b/src/ZE_ZConfigFile.cpp
@@ -13,7 +13,7 @@
 File: ZE_ZConfigFile.cpp <br>
 Description: Implementation source file for ZConfigFile, the ZEngine INI-Style Config File. <br>
 Author(s): James Turk <br>
-$Id: ZE_ZConfigFile.cpp,v 1.3 2002/12/29 06:52:07 cozman Exp $<br>
+$Id: ZE_ZConfigFile.cpp,v 1.4 2003/01/16 05:45:58 cozman Exp $<br>
 
     \file ZE_ZConfigFile.cpp
     \brief Source file for ZConfigFile.
@@ -26,7 +26,7 @@ $Id: ZE_ZConfigFile.cpp,v 1.3 2002/12/29 06:52:07 cozman Exp $<br>
 namespace ZE
 {
 
-string ZConfigFile::CleanString(string str)
+string ZConfigFile::CleanString(string str)  const
 {
     string tmpStr;
     bool inQuotes = false;
@@ -46,9 +46,9 @@ string ZConfigFile::CleanString(string str)
     return tmpStr;
 }
 
-bool ZConfigFile::Exists(string sec)
+bool ZConfigFile::Exists(string sec) const
 {
-    list<ZCF_Section>::iterator secIter;
+    list<ZCF_Section>::const_iterator secIter;
 
     sec = CleanString(sec);
 
@@ -60,10 +60,10 @@ bool ZConfigFile::Exists(string sec)
     return false;
 }
 
-bool ZConfigFile::Exists(string sec, string var)
+bool ZConfigFile::Exists(string sec, string var) const
 {
-    list<ZCF_Section>::iterator secIter;
-    list<ZCF_Variable>::iterator varIter;
+    list<ZCF_Section>::const_iterator secIter;
+    list<ZCF_Variable>::const_iterator varIter;
 
     sec = CleanString(sec);
     var = CleanString(var);
@@ -126,10 +126,10 @@ void ZConfigFile::SetVariable(string sec, string var, string val)
     }
 }
 
-string ZConfigFile::GetVariable(string sec, string var, string defVal)
+string ZConfigFile::GetVariable(string sec, string var, string defVal) const
 {
-    list<ZCF_Section>::iterator secIter;
-    list<ZCF_Variable>::iterator varIter;
+    list<ZCF_Section>::const_iterator secIter;
+    list<ZCF_Variable>::const_iterator varIter;
 
     sec = CleanString(sec);
     var = CleanString(var);
@@ -199,7 +199,7 @@ void ZConfigFile::Process(string filename)
     cfile.close();
 }
 
-int ZConfigFile::GetInt(string section, string var, int defVal)
+int ZConfigFile::GetInt(string section, string var, int defVal) const
 {
     string val;
     char tmp[20];
@@ -218,7 +218,7 @@ int ZConfigFile::GetInt(string section, string var, int defVal)
         return atoi(val.c_str());
 }
 
-bool ZConfigFile::GetBool(string section, string var, bool defVal)
+bool ZConfigFile::GetBool(string section, string var, bool defVal) const
 {
     string val,tmp;
 
@@ -238,7 +238,7 @@ bool ZConfigFile::GetBool(string section, string var, bool defVal)
         return defVal;
 }
 
-string ZConfigFile::GetString(string section, string var, string defVal)
+string ZConfigFile::GetString(string section, string var, string defVal) const
 {
     string val;
 
diff --git a/src/ZE_ZError.cpp b/src/ZE_ZError.cpp
index e6c70b5..6e1cd49 100755
--- a/src/ZE_ZError.cpp
+++ b/src/ZE_ZError.cpp
@@ -13,7 +13,7 @@
 File: ZE_ZError.cpp <br>
 Description: Implementation source file for core ZEngine Error Object. <br>
 Author(s): James Turk <br>
-$Id: ZE_ZError.cpp,v 1.1 2003/01/15 05:40:09 cozman Exp $<br>
+$Id: ZE_ZError.cpp,v 1.2 2003/01/16 05:45:58 cozman Exp $<br>
 
     \file ZE_ZError.cpp
     \brief Source file for ZError.
@@ -53,12 +53,12 @@ void ZError::Create(ZErrorCode code, string desc, string file, int line)
     rLine = line;
 }
 
-ZErrorCode ZError::Code()
+ZErrorCode ZError::Code() const
 {
     return rCode;
 }
 
-string ZError::LogString()
+string ZError::LogString() const
 {
     string msg;
     
diff --git a/src/ZE_ZFont.cpp b/src/ZE_ZFont.cpp
index 0cec38b..ca740e1 100644
--- a/src/ZE_ZFont.cpp
+++ b/src/ZE_ZFont.cpp
@@ -13,7 +13,7 @@
 File: ZE_ZFont.cpp <br>
 Description: Implementation source file for core ZEngine Font Object. <br>
 Author(s): James Turk <br>
-$Id: ZE_ZFont.cpp,v 1.4 2003/01/13 06:00:38 cozman Exp $<br>
+$Id: ZE_ZFont.cpp,v 1.5 2003/01/16 05:45:58 cozman Exp $<br>
 
     \file ZE_ZFont.cpp
     \brief Source file for ZFont.
@@ -60,12 +60,12 @@ void ZFont::Release()
     FreeFont(rFont);
 }
 
-void ZFont::DrawText(string text, ZImage &image)
+void ZFont::DrawText(string text, ZImage &image) const
 {
     image.Attach(TTF_RenderText_Solid(rFont, text.c_str(), rColor));
 }
 
-void ZFont::DrawShadedText(string text, ZImage &image)
+void ZFont::DrawShadedText(string text, ZImage &image) const
 {
     image.Attach(TTF_RenderText_Shaded(rFont, text.c_str(), rColor, rBGColor));
 }
@@ -108,12 +108,12 @@ void ZFont::Resize(int size)
     Open(rFilename,size);
 }
 
-bool ZFont::IsLoaded()
+bool ZFont::IsLoaded() const
 {
     return rFont != NULL;
 }
 
-bool ZFont::IsBold()
+bool ZFont::IsBold() const
 {
     if(rFont)
         return (TTF_GetFontStyle(rFont) & TTF_STYLE_BOLD) > 0;
@@ -124,7 +124,7 @@ bool ZFont::IsBold()
     }
 }
 
-bool ZFont::IsItalic()
+bool ZFont::IsItalic() const
 {
     if(rFont)
         return (TTF_GetFontStyle(rFont) & TTF_STYLE_ITALIC) > 0;
@@ -135,7 +135,7 @@ bool ZFont::IsItalic()
     }
 }
 
-bool ZFont::IsUnderlined()
+bool ZFont::IsUnderlined() const
 {
     if(rFont)
         return (TTF_GetFontStyle(rFont) & TTF_STYLE_UNDERLINE) > 0;
@@ -146,7 +146,7 @@ bool ZFont::IsUnderlined()
     }
 }
 
-int ZFont::Height()
+int ZFont::Height() const
 {
     if(rFont)
         return TTF_FontHeight(rFont);
@@ -157,7 +157,7 @@ int ZFont::Height()
     }
 }
 
-int ZFont::LineSkip()
+int ZFont::LineSkip() const
 {
     if(rFont)
         return TTF_FontLineSkip(rFont);
@@ -168,7 +168,7 @@ int ZFont::LineSkip()
     }
 }
 
-int ZFont::StringWidth(string text)
+int ZFont::StringWidth(string text) const
 {
     int w,h;
 
@@ -184,7 +184,7 @@ int ZFont::StringWidth(string text)
     }
 }
 
-int ZFont::StringHeight(string text)
+int ZFont::StringHeight(string text) const
 {
     int w,h;
 
diff --git a/src/ZE_ZImage.cpp b/src/ZE_ZImage.cpp
index 380c4a8..b44aff2 100644
--- a/src/ZE_ZImage.cpp
+++ b/src/ZE_ZImage.cpp
@@ -13,7 +13,7 @@
 File: ZE_ZImage.cpp <br>
 Description: Implementation source file for core ZEngine Image or Texture Object. <br>
 Author(s): James Turk, Gamer Tazar <br>
-$Id: ZE_ZImage.cpp,v 1.14 2003/01/13 06:00:38 cozman Exp $<br>
+$Id: ZE_ZImage.cpp,v 1.15 2003/01/16 05:45:58 cozman Exp $<br>
 
     \file ZE_ZImage.cpp
     \brief Source file for ZImage.
@@ -189,7 +189,7 @@ void ZImage::Resize(unsigned int width, unsigned int height)
     rHeight = height;
 }
 
-void ZImage::Bind()
+void ZImage::Bind() const
 {
     if(!rTexID)
         rEngine->ReportError(ZERR_NOIMAGE,"Bind");
@@ -197,7 +197,7 @@ void ZImage::Bind()
         glBindTexture(GL_TEXTURE_2D, rTexID);
 }
 
-void ZImage::Draw(float x, float y)
+void ZImage::Draw(float x, float y) const
 {
     Bind();
 
@@ -209,7 +209,7 @@ void ZImage::Draw(float x, float y)
     glEnd();
 }
 
-void ZImage::DrawRotated(int x, int y, float angle)
+void ZImage::DrawRotated(int x, int y, float angle) const
 {
     float cX,cY; //center variables
 
@@ -229,22 +229,22 @@ void ZImage::DrawRotated(int x, int y, float angle)
     glPopMatrix();
 }
 
-bool ZImage::IsLoaded()
+bool ZImage::IsLoaded() const
 {
     return glIsTexture(rTexID) == GL_TRUE;
 }
 
-SDL_Surface* ZImage::Surface()
+SDL_Surface* ZImage::Surface() const
 {
     return rImage;
 }
 
-int ZImage::Width()
+int ZImage::Width() const
 {
     return rWidth;
 }
 
-int ZImage::Height()
+int ZImage::Height() const
 {
     return rHeight;
 }
diff --git a/src/ZE_ZMusic.cpp b/src/ZE_ZMusic.cpp
index 6d36683..d92aed2 100644
--- a/src/ZE_ZMusic.cpp
+++ b/src/ZE_ZMusic.cpp
@@ -13,7 +13,7 @@
 File: ZE_ZMusic.cpp <br>
 Description: Implementation source file for core ZEngine Music Object. <br>
 Author(s): James Turk <br>
-$Id: ZE_ZMusic.cpp,v 1.4 2003/01/13 06:00:38 cozman Exp $<br>
+$Id: ZE_ZMusic.cpp,v 1.5 2003/01/16 05:45:58 cozman Exp $<br>
 
     \file ZE_ZMusic.cpp
     \brief Source file for ZMusic.
@@ -58,7 +58,7 @@ void ZMusic::Release()
     FreeMusic(rMusic);
 }
 
-void ZMusic::Play(int loopNum, int fadeTime)
+void ZMusic::Play(int loopNum, int fadeTime) const
 {
     if(Mix_PlayingMusic())    //stop currently playing music
         Mix_HaltMusic();
@@ -74,7 +74,7 @@ void ZMusic::Play(int loopNum, int fadeTime)
         rEngine->ReportError(ZERR_NOMUSIC, "Play");
 }
 
-void ZMusic::Pause()
+void ZMusic::Pause() const
 {
     if(rMusic)
         Mix_PauseMusic();
@@ -82,7 +82,7 @@ void ZMusic::Pause()
         rEngine->ReportError(ZERR_NOMUSIC, "Pause");
 }
 
-void ZMusic::Unpause()
+void ZMusic::Unpause() const
 {
     if(rMusic)
         Mix_ResumeMusic();
@@ -90,7 +90,7 @@ void ZMusic::Unpause()
         rEngine->ReportError(ZERR_NOMUSIC, "Unpause");
 }
 
-void ZMusic::Rewind()
+void ZMusic::Rewind() const
 {
     if(rMusic)
         Mix_RewindMusic();
@@ -98,7 +98,7 @@ void ZMusic::Rewind()
         rEngine->ReportError(ZERR_NOMUSIC, "Rewind");
 }
 
-void ZMusic::Stop(int fadeTime)
+void ZMusic::Stop(int fadeTime) const
 {
     if(rMusic)
     {
@@ -119,12 +119,12 @@ void ZMusic::SetVolume(int volume)
         rEngine->ReportError(ZERR_NOMUSIC, "SetVolume");
 }
 
-bool ZMusic::IsLoaded()
+bool ZMusic::IsLoaded() const
 {
     return rMusic != NULL;
 }
 
-bool ZMusic::IsPlaying()
+bool ZMusic::IsPlaying() const
 {
     if(rMusic)
         return Mix_PlayingMusic() > 0;
@@ -135,7 +135,7 @@ bool ZMusic::IsPlaying()
     }
 }
 
-bool ZMusic::IsPaused()
+bool ZMusic::IsPaused() const
 {
     if(rMusic)
         return Mix_PausedMusic() > 0;
@@ -146,7 +146,7 @@ bool ZMusic::IsPaused()
     }
 }
 
-int ZMusic::Volume()
+int ZMusic::Volume() const
 {
     if(rMusic)
         return Mix_VolumeMusic(-1);
diff --git a/src/ZE_ZRect.cpp b/src/ZE_ZRect.cpp
index 0d1f9f8..4aff8c4 100644
--- a/src/ZE_ZRect.cpp
+++ b/src/ZE_ZRect.cpp
@@ -13,7 +13,7 @@
 File: ZE_ZRect.cpp <br>
 Description: Implementation source file for core ZEngine Rectangle Object. <br>
 Author(s): James Turk <br>
-$Id: ZE_ZRect.cpp,v 1.6 2003/01/08 06:07:07 cozman Exp $<br>
+$Id: ZE_ZRect.cpp,v 1.7 2003/01/16 05:45:58 cozman Exp $<br>
 
     \file ZE_ZRect.cpp
     \brief Source file for ZRect.
@@ -86,7 +86,7 @@ bool ZRect::operator<(const ZRect &rhs) const
     }
 }
 
-void ZRect::Draw(Uint8 red, Uint8 green, Uint8 blue, Uint8 alpha)
+void ZRect::Draw(Uint8 red, Uint8 green, Uint8 blue, Uint8 alpha) const
 {
     glBindTexture(GL_TEXTURE_2D,0); //reset to blank texture
     glColor4ub(red,green,blue,alpha);
diff --git a/src/ZE_ZSound.cpp b/src/ZE_ZSound.cpp
index 19acae1..2968b52 100644
--- a/src/ZE_ZSound.cpp
+++ b/src/ZE_ZSound.cpp
@@ -13,7 +13,7 @@
 File: ZE_ZSound.cpp <br>
 Description: Implementation source file for core ZEngine Sound Object. <br>
 Author(s): James Turk <br>
-$Id: ZE_ZSound.cpp,v 1.4 2003/01/13 06:00:38 cozman Exp $<br>
+$Id: ZE_ZSound.cpp,v 1.5 2003/01/16 05:45:58 cozman Exp $<br>
 
     \file ZE_ZSound.cpp
     \brief Source file for ZSound.
@@ -77,7 +77,7 @@ void ZSound::Play(int loopNum, int fadeTime)
         rEngine->ReportError(ZERR_NOSOUND, "Play");
 }
 
-void ZSound::Pause()
+void ZSound::Pause() const
 {
     if(rSound && rChannelID >= 0)
         Mix_Pause(rChannelID);
@@ -85,7 +85,7 @@ void ZSound::Pause()
         rEngine->ReportError(ZERR_NOSOUND, "Pause");
 }
 
-void ZSound::Unpause()
+void ZSound::Unpause() const
 {
     if(rSound && rChannelID >= 0)
         Mix_Resume(rChannelID);
@@ -93,7 +93,7 @@ void ZSound::Unpause()
         rEngine->ReportError(ZERR_NOSOUND, "Unpause");
 }
 
-void ZSound::Stop(int fadeTime)
+void ZSound::Stop(int fadeTime) const
 {
     if(rSound && rChannelID >= 0)
     {
@@ -114,12 +114,12 @@ void ZSound::SetVolume(int volume)
         rEngine->ReportError(ZERR_NOSOUND, "SetVolume");
 }
 
-bool ZSound::IsLoaded()
+bool ZSound::IsLoaded() const
 {
     return rSound != NULL;
 }
 
-bool ZSound::IsPlaying()
+bool ZSound::IsPlaying() const
 {
     if(rSound && rChannelID >= 0)
         return Mix_Playing(rChannelID) > 0;
@@ -131,7 +131,7 @@ bool ZSound::IsPlaying()
     }
 }
 
-bool ZSound::IsPaused()
+bool ZSound::IsPaused() const
 {
     if(rSound && rChannelID >= 0)
         return Mix_Paused(rChannelID) > 0;
@@ -142,7 +142,7 @@ bool ZSound::IsPaused()
     }
 }
 
-int ZSound::Volume()
+int ZSound::Volume() const
 {
     if(rSound)
         return Mix_VolumeChunk(rSound,-1);
diff --git a/src/ZE_ZTimer.cpp b/src/ZE_ZTimer.cpp
index d23e072..d1e36d1 100644
--- a/src/ZE_ZTimer.cpp
+++ b/src/ZE_ZTimer.cpp
@@ -13,7 +13,7 @@
 File: ZE_ZTimer.cpp <br>
 Description: Implementation source file for core ZEngine Timer Object. <br>
 Author(s): James Turk <br>
-$Id: ZE_ZTimer.cpp,v 1.3 2002/12/29 06:52:07 cozman Exp $<br>
+$Id: ZE_ZTimer.cpp,v 1.4 2003/01/16 05:45:58 cozman Exp $<br>
 
     \file ZE_ZTimer.cpp
     \brief Source file for ZTimer.
@@ -26,7 +26,7 @@ $Id: ZE_ZTimer.cpp,v 1.3 2002/12/29 06:52:07 cozman Exp $<br>
 namespace ZE
 {
 
-Uint32 ZTimer::GetParentTime()
+Uint32 ZTimer::GetParentTime() const
 {
     if(rUseZEngine)
         return rEngine->GetTime();
@@ -65,7 +65,7 @@ void ZTimer::Unpause()
     }
 }
 
-Uint32 ZTimer::GetTime()
+Uint32 ZTimer::GetTime() const
 {
     if(rPaused)
         return GetParentTime() - (rPausedTime +  (GetParentTime() - rLastPause));
@@ -73,7 +73,7 @@ Uint32 ZTimer::GetTime()
         return GetParentTime() - rPausedTime;
 }
 
-bool ZTimer::IsPaused()
+bool ZTimer::IsPaused() const
 {
     return rPaused;
 }