Listing 6: myCanvasPane class definition header

//================================================================
//  drawcnv.h 
//  Copyright (C) 1995  Bruce E. Wampler
//================================================================
#ifndef DRAWCANVAS_H
#define DRAWCANVAS_H
#include <v/include/vcanvas.h>  // derive from vCanvas
#include <v/include/vpen.h>     // contain a vPen

typedef struct point        // simple struct for points
  {
    int x;  int y;          // coordinates
    vPen pPen;              // pen to use
  } point;

class myCanvasPane : public vCanvasPane
  {
  public:           //--------------------------------- public
    myCanvasPane();
    virtual ~myCanvasPane();

    // Methods we will override.

    virtual void Clear();
    virtual void MouseDown(int X, int Y, int button);
    virtual void MouseUp(int X, int Y, int button);
    virtual void MouseMove(int x, int y, int button);
    virtual void Redraw(int x, int y, int w, int h);
    virtual void myCanvasPane::Resize(int w, int h);

    // New methods for this class
    int Read(char* name);
    int Save(char* name);

  protected:        //------------------------------ protected

  private:          //-------------------------------- private
    int _mouseDown;                 // state of mouse
    int _begx;  int _begy;  int _curx;  int _cury;  // coords
    point *_pt;                     // for point list
    int _nextpt;                    // next free point
  };
#endif
/* End of File */