From 88ad09d293b2f6227543b9b395314c9921356bbf Mon Sep 17 00:00:00 2001
From: Kyzentun <kyzentun@gmail.com>
Date: Wed, 12 Feb 2014 18:13:49 -0700
Subject: [PATCH] Added distort function to BitmapText.

---
 Docs/Luadoc/Lua.xml              |  2 ++
 Docs/Luadoc/LuaDocumentation.xml |  8 +++++++
 src/BitmapText.cpp               | 37 ++++++++++++++++++++++++++++++++
 src/BitmapText.h                 |  4 ++++
 4 files changed, 51 insertions(+)

diff --git a/Docs/Luadoc/Lua.xml b/Docs/Luadoc/Lua.xml
index 994dd0d681..7aeb140227 100644
--- a/Docs/Luadoc/Lua.xml
+++ b/Docs/Luadoc/Lua.xml
@@ -550,6 +550,7 @@
 			<Function name='NoStroke'/>
 			<Function name='PixelFont'/>
 			<Function name='Stroke'/>
+			<Function name='distort'/>
 			<Function name='jitter'/>
 			<Function name='maxheight'/>
 			<Function name='maxwidth'/>
@@ -558,6 +559,7 @@
 			<Function name='settextf'/>
 			<Function name='strokecolor'/>
 			<Function name='textglowmode'/>
+			<Function name='undistort'/>
 			<Function name='uppercase'/>
 			<Function name='vertspacing'/>
 			<Function name='wrapwidthpixels'/>
diff --git a/Docs/Luadoc/LuaDocumentation.xml b/Docs/Luadoc/LuaDocumentation.xml
index d40e06f3b2..1cbd8e95dd 100644
--- a/Docs/Luadoc/LuaDocumentation.xml
+++ b/Docs/Luadoc/LuaDocumentation.xml
@@ -1611,6 +1611,14 @@ save yourself some time, copy this for undocumented things:
 	<Function name='GetText' return='string' arguments=''>
 		Returns the text that is currently set.
 	</Function>
+	<Function name='distort' return='void' arguments='float distortion_percentage'>
+		Causes each character of text to be randomly distorted by
+		distortion_percentage of its size when the text is set.  The distortion
+		only changes when the text changes.
+	</Function>
+	<Function name='undistort' return='void' arguments=''>
+		Turns off distortion.
+	</Function>
 	<Function name='jitter' return='void' arguments='bool bJitter'>
 		If <code>bJitter</code> is <code>true</code>, move each character of the string around by a small random amount.
 	</Function>
diff --git a/src/BitmapText.cpp b/src/BitmapText.cpp
index 2d3998abe9..975e81bf6d 100644
--- a/src/BitmapText.cpp
+++ b/src/BitmapText.cpp
@@ -47,6 +47,8 @@ BitmapText::BitmapText()
 
 	m_bRainbowScroll = false;
 	m_bJitter = false;
+	m_fDistortion= 0.0f;
+	m_bUsingDistortion= false;
 
 	m_iWrapWidthPixels = -1;
 	m_fMaxWidth = 0;
@@ -84,6 +86,8 @@ BitmapText & BitmapText::operator=(const BitmapText &cpy)
 	CPY( m_fMaxHeight );
 	CPY( m_bRainbowScroll );
 	CPY( m_bJitter );
+	CPY( m_fDistortion );
+	CPY( m_bUsingDistortion );
 	CPY( m_iVertSpacing );
 	CPY( m_aVertices );
 	CPY( m_vpFontPageTextures );
@@ -252,6 +256,22 @@ void BitmapText::BuildChars()
 		// The amount of padding a line needs:
 		iY += iPadding;
 	}
+
+	if( m_bUsingDistortion )
+	{
+		int iSeed = lrintf( RageTimer::GetTimeSinceStartFast()*500000.0f );
+		RandomGen rnd( iSeed );
+		for(unsigned int i= 0; i < m_aVertices.size(); i+=4)
+		{
+			float w= m_aVertices[i+2].p.x - m_aVertices[i].p.x;
+			float h= m_aVertices[i+2].p.y - m_aVertices[i].p.y;
+			for(unsigned int ioff= 0; ioff < 4; ++ioff)
+			{
+				m_aVertices[i+ioff].p.x += ((rnd()%9) / 8.0f - .5f) * m_fDistortion * w;
+				m_aVertices[i+ioff].p.y += ((rnd()%9) / 8.0f - .5f) * m_fDistortion * h;
+			}
+		}
+	}
 }
 
 void BitmapText::DrawChars( bool bUseStrokeTexture )
@@ -470,6 +490,19 @@ void BitmapText::SetUppercase( bool b )
 	BuildChars();
 }
 
+void BitmapText::SetDistortion( float f )
+{
+	m_fDistortion= f;
+	m_bUsingDistortion= true;
+	BuildChars();
+}
+
+void BitmapText::UnSetDistortion()
+{
+	m_bUsingDistortion= false;
+	BuildChars();
+}
+
 void BitmapText::UpdateBaseZoom()
 {
 	if( m_fMaxWidth == 0 )
@@ -827,6 +860,8 @@ public:
 	}
 	static int rainbowscroll( T* p, lua_State *L )		{ p->SetRainbowScroll( BArg(1) ); return 0; }
 	static int jitter( T* p, lua_State *L )			{ p->SetJitter( BArg(1) ); return 0; }
+	static int distort( T* p, lua_State *L) { p->SetDistortion( FArg(1) ); return 0; }
+	static int undistort( T* p, lua_State *L) { p->UnSetDistortion(); return 0; }
 	static int GetText( T* p, lua_State *L )		{ lua_pushstring( L, p->GetText() ); return 1; }
 	static int AddAttribute( T* p, lua_State *L )
 	{
@@ -851,6 +886,8 @@ public:
 		ADD_METHOD( settext );
 		ADD_METHOD( rainbowscroll );
 		ADD_METHOD( jitter );
+		ADD_METHOD( distort );
+		ADD_METHOD( undistort );
 		ADD_METHOD( GetText );
 		ADD_METHOD( AddAttribute );
 		ADD_METHOD( ClearAttributes );
diff --git a/src/BitmapText.h b/src/BitmapText.h
index bc06c5c406..6a1fad3a00 100644
--- a/src/BitmapText.h
+++ b/src/BitmapText.h
@@ -34,6 +34,8 @@ public:
 	void SetUppercase( bool b );
 	void SetRainbowScroll( bool b )	{ m_bRainbowScroll = b; }
 	void SetJitter( bool b )	{ m_bJitter = b; }
+	void SetDistortion( float f );
+	void UnSetDistortion();
 
 	void SetHorizAlign( float f );
 
@@ -77,6 +79,8 @@ protected:
 	float		m_fMaxHeight;			// 0 = no max
 	bool		m_bRainbowScroll;
 	bool		m_bJitter;
+	bool		m_bUsingDistortion;
+	float		m_fDistortion;
 	int			m_iVertSpacing;
 
 	vector<RageSpriteVertex>	m_aVertices;