src/add-ons/screen_savers/butterfly/Butterfly.h

   1 /*
   2  * Copyright 2010-2011, Haiku, Inc. All Rights Reserved.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Authors:
   6  *              Geoffry Song, goffrie@gmail.com
   7  */
   8 #ifndef _BUTTERFLY_H_
   9 #define _BUTTERFLY_H_
  10
  11
  12 #include <ScreenSaver.h>
  13
  14
  15 class Butterfly : public BScreenSaver {
  16 public:
  17                                                                 Butterfly(BMessage* archive, image_id imageID);
  18
  19         virtual void                            StartConfig(BView* view);
  20         virtual status_t                        StartSaver(BView* view, bool preview);
  21         virtual void                            Draw(BView* view, int32 frame);
  22
  23 private:
  24         inline  rgb_color                       _HueToColor(float hue);
  25         inline  BPoint                          _Iterate();
  26
  27 private:
  28                         // base value for calculating the curves on each iteration
  29                         float                           fBase;
  30                         // previously calculated points
  31                         BPoint                          fLast[3];
  32                         // transformation from graph coordinates to view coordinates
  33                         float                           fScale;
  34                         BPoint                          fTrans;
  35                         // bounding box of drawn figure
  36                         BRect                           fBounds;
  37 };
  38
  39
  40 #endif  // _BUTTERFLY_H_