ffruler.h

#ifndef __FFRULER_H__
#define __FFRULER_H__
/*=============================================================================   
     Module  : ffruler.h
     Purpose : Define a free-form( multiple sections ) ruler tool module.
     Author  : Doug Ehlenberger, CNIC Mt. Sinai School of Medicine
               
==============================================================================*/
#include "viasgui.h"
#include "vectori.h"
#include "dllist.h"


DefineDll( FFRCTRLLIST, 
           Vector2i  point;, 
           vINT      pad; 
         );


typedef enum
   {
   vFFR_MODE_FIRST_CONTROL,
   vFFR_MODE_DRAG_CONTROL,
   vFFR_MODE_DRAG_RULER,
   vFFR_MODE_IDLE
   }
   vFFR_MODE_TYPE;


typedef enum
   {
   vFFR_CURSOR_STANDARD,
   vFFR_CURSOR_OVER_CONTROL,
   vFFR_CURSOR_OVER_LINE,

   vFFR_CURSOR_SENTINEL
   }
   vFFR_CURSOR_TYPE;

#define vNUM_FFR_CURSORS  ( ( vINT )vFFR_CURSOR_SENTINEL )


typedef struct tagFFRULER
   {
   HWND                 hOwner;
   HDC                  hDC;
   HPEN                 hPen;
   FFRCTRLLIST          controls;
   FFRCTRLLISTIterator  activeControl;
   vFFR_MODE_TYPE       mode;
   vFFR_CURSOR_TYPE     cursor;
   }
   FFRULER;


#define vFFR_COLOR            ( ( COLORREF )0x00808080 )

#define vFFR_CTRL_WIDTH         7
#define vFFR_CTRL_HALF_WIDTH    3
#define vFFR_CTRL_HEIGHT        vFFR_CTRL_WIDTH
#define vFFR_CTRL_HALF_HEIGHT   vFFR_CTRL_HALF_WIDTH

#define vFFR_CTRL_TOLERANCE     vFFR_CTRL_WIDTH

#define vFFR_LINE_TOLERANCE     25.0f


/* Failure could occur if not enough memory to initalize list. 
   Very unlikely since the list needs only 8 bytes! */

vBOOL CreateFreeFormRuler( FFRULER *ruler, HWND hOwner, HDC hDC );

vVOID DestroyFreeFormRuler( FFRULER *ruler );

vVOID DrawFreeFormRuler( FFRULER *ruler );
vVOID EraseFreeFormRuler( FFRULER *ruler );


typedef enum
   {
   vFFR_MOUSE_MOVE,
   vFFR_MOUSE_LBUTTONDOWN,   
   vFFR_MOUSE_LBUTTONUP,
   vFFR_MOUSE_LBUTTONDBLCLK
   }
   vFFR_MOUSE_ACTION_TYPE;


/* Returns vFALSE if memory allocation failure. */

vBOOL OnMouseFreeFormRuler
   ( 
   FFRULER                *ruler, 
   vINT                    mouseX, 
   vINT                    mouseY,
   vFFR_MOUSE_ACTION_TYPE  mouseAction
   );


vVOID SetFreeFormRulerLength( FFRULER *ruler );


#endif/* __FFRULER_H__ */

---