Add NoteFieldPositioning. This handles translating from the origin

of a note field to the position of each track.  (No new functionality yet.)

stepmania/src/NoteFieldPositioning.cpp

@@ -0,0 +1,94 @@
+#include "global.h"
+#include "NoteFieldPositioning.h"
+#include "Actor.h"
+#include "RageDisplay.h"
+#include "RageUtil.h"
+#include "RageMath.h"
+#include "RageLog.h"
+
+
+NoteFieldPositioning::NoteFieldPositioning()
+{
+	/* Note: while Actor class is usually the base class of something that
+	 * renders something to screen, all Actor itself does is store location and
+	 * effect state and handle tweening between them.  These actors do this
+	 * without actually rendering anything; we only use them for their render
+	 * state. */
+	for( int t=0; t<MAX_NOTE_TRACKS; t++ )
+	{
+		m_Position[t] = new Actor;
+		m_bPerspective[t] = false;
+		m_PerspPosition[t] = new Actor;
+	}
+
+	Init();
+}
+
+NoteFieldPositioning::~NoteFieldPositioning()
+{
+	for( int t=0; t<MAX_NOTE_TRACKS; t++ )
+	{
+		delete m_Position[t];
+		delete m_PerspPosition[t];
+	}
+}
+
+void NoteFieldPositioning::Init()
+{
+	for( int t=0; t<MAX_NOTE_TRACKS; t++ )
+	{
+		m_Position[t]->Reset();
+	}
+}
+/*
+void NoteFieldPositioning::LoadFromFile(CString fn)
+{
+	Init();
+
+}
+*/
+void NoteFieldPositioning::LoadFromStyleDef(const StyleDef *s, PlayerNumber pn)
+{
+	Init();
+
+	for( int t=0; t<MAX_NOTE_TRACKS; t++ )
+	{
+		/* Set up the normal position of each track. */
+		const float fPixelXOffsetFromCenter = s->m_ColumnInfo[pn][t].fXOffset;
+		m_Position[t]->SetX(fPixelXOffsetFromCenter);
+	}
+}
+
+void NoteFieldPositioning::Update(float fDeltaTime)
+{
+	for( int t=0; t<MAX_NOTE_TRACKS; t++ )
+	{
+		m_Position[t]->Update(fDeltaTime);
+		m_PerspPosition[t]->Update(fDeltaTime);
+	}
+}
+
+void NoteFieldPositioning::BeginDrawTrack(int tn)
+{
+	m_Position[tn]->BeginDraw();
+
+	if(m_bPerspective[tn])
+	{
+		DISPLAY->EnterPerspective(45);
+	}
+	
+//	m_PerspPosition[tn]->BeginDraw();
+}
+
+void NoteFieldPositioning::EndDrawTrack(int tn)
+{
+	m_PerspPosition[tn]->EndDraw();
+
+	if(m_bPerspective[tn])
+	{
+		DISPLAY->ExitPerspective();
+	}
+
+//	m_Position[tn]->EndDraw();
+}
+