xaosview.h

另一个分形程序

// The View class for XaoS on BeOS.
// Copyright © 1997  Jens Kilian ([e-mail])
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

#ifndef XAOSVIEW_H
#define XAOSVIEW_H

#include <Bitmap.h>
#include <Font.h>
#include <OS.h>
#include <Point.h>
#include <Rect.h>
#include <SupportDefs.h>
#include <View.h>

#include "XaoSEvent.h"

class XaoSView:public BView
{
public:
  typedef BView inherited;

  // Constructor, destructor.
    XaoSView (BRect r, port_id p);
    virtual ~ XaoSView (void);

  // Hook functions.
  virtual void AttachedToWindow (void);
  virtual void Draw (BRect updateRect);
  virtual void FrameResized (float width, float height);
  virtual void ScreenChanged (BRect rect, color_space space);
  virtual void KeyDown (const char *pBytes, int32 numBytes);
  virtual void KeyUp (const char *pBytes, int32 numBytes);
  virtual void MessageReceived (BMessage * pMessage);
  virtual void MouseDown (BPoint point);
  virtual void MouseUp (BPoint point);
  virtual void MouseMoved (BPoint point, uint32 transit,
			   const BMessage * pMessage);
  virtual void WindowActivated (bool active);

  // Return the event port.
  port_id EventPort (void) const;

  // Set the screen buffer.
  void SetBuffer (BBitmap * pBuffer, int async);

  // Auxiliary functions.
  void GetTextSize (float &width, float &height);
  void DrawText (BPoint leftTop, const char *const pText, int32 length);

protected:
    BBitmap * mpBuffer;
    XaoSView (const XaoSView & orig);
    XaoSView & operator = (const XaoSView & orig);
private:

  void SendEvent (long eventCode, const XaoSEvent & event) const;
  float TextHeight (void) const;

  // Data members.
  port_id mEventPort;
  font_height mFontHeight;
  int async;
};

// Inline functions.

inline port_id
XaoSView::EventPort (void) const
{
  return mEventPort;
}

inline void
XaoSView::SendEvent (long eventCode, const XaoSEvent & event) const
{
  (void) write_port (mEventPort, eventCode, &event, sizeof (XaoSEvent));
}

inline float
XaoSView::TextHeight (void) const
{
  return mFontHeight.ascent + mFontHeight.descent + mFontHeight.leading;
}

#endif // XAOSVIEW_H