MagicSetEditor2/src/gui/image_slice_window.hpp

//+----------------------------------------------------------------------------+
//| Description:  Magic Set Editor - Program to make Magic (tm) cards          |
//| Copyright:    (C) Twan van Laarhoven and the other MSE developers          |
//| License:      GNU General Public License 2 or later (see file COPYING)     |
//+----------------------------------------------------------------------------+

#pragma once

// ----------------------------------------------------------------------------- : Includes

#include <util/prec.hpp>

class ImageSlicePreview;
class ImageSliceSelector;
class wxSpinEvent;
class wxSpinCtrl;
DECLARE_POINTER_TYPE(AlphaMask);

// ----------------------------------------------------------------------------- : ImageSlice

/// Which option is just changed, and therefore more important?
enum PreferedProperty
{  PREFER_NONE
,  PREFER_WIDTH
,  PREFER_HEIGHT
};

/// A slice of an image, i.e. a selected rectangle
class ImageSlice {
public:
  ImageSlice(const Image& source, const wxSize& target_size);
  
  Image  source;    ///< The source image
  wxSize target_size;  ///< Size of the target image
  Color  background;  ///< Color for areas outside the source image
  wxRect selection;  ///< Area to slect from source
  bool allow_outside;
  bool aspect_fixed;  ///< Aspect ratio lock?
  // Filters
  bool sharpen;
  int sharpen_amount;
  
  /// Enforce relations between values
  void constrain(PreferedProperty prefer = PREFER_NONE);
  /// Attempt to center the current constraints
  void centerSelection();
  void centerSelectionHorizontally();
  void centerSelectionVertically();
  /// Get the sliced image
  Image getSlice(double scale = 1.0) const;
  
  // Zoom factor
  inline double zoomX() const { return target_size.GetWidth()  / (double)selection.width;  }
  inline double zoomY() const { return target_size.GetHeight() / (double)selection.height; }
  inline void zoomX(double zoom) { selection.width  = int(target_size.GetWidth()  / zoom); }
  inline void zoomY(double zoom) { selection.height = int(target_size.GetHeight() / zoom); }
};


// ----------------------------------------------------------------------------- : ImageSliceWindow

/// Dialog for selecting a slice of an image
class ImageSliceWindow : public wxDialog {
public:
  ImageSliceWindow(Window* parent, const Image& source, const wxSize& target_size, const AlphaMask& target_mask);
  
  /// Return the sliced image
  Image getImage(double scale) const;
  
  // --------------------------------------------------- : Data
private:
  // The slice we are extracting
  ImageSlice slice;
  // Gui items
  ImageSlicePreview*   preview;
  ImageSliceSelector*  selector;
  wxRadioBox*          size;
  wxSpinCtrl*          top, *left, *width, *height;
  wxCheckBox*          fix_aspect;
  wxSpinCtrl*          zoom, *zoom_x, *zoom_y;
  wxSizer*             zoom_sizer, *zoom_fixed, *zoom_free;
  wxCheckBox*          sharpen;
  wxSlider*            sharpen_amount;
  bool                 initialized; // is the gui initialized?
  
  // --------------------------------------------------- : Events
  DECLARE_EVENT_TABLE();
  
  void onOk                 (wxCommandEvent&);
  
  void onSize               (wxSizeEvent&);
  
  void onChangeSize         (wxCommandEvent&);
  void onChangeLeft         (wxCommandEvent&);
  void onChangeTop          (wxCommandEvent&);
  void onChangeWidth        (wxCommandEvent&);
  void onChangeHeight       (wxCommandEvent&);
  void onSelectionCenter(wxCommandEvent&);
  void onChangeFixAspect    (wxCommandEvent&);
  void onChangeZoom         (wxSpinEvent&);
  void onChangeZoomX        (wxSpinEvent&);
  void onChangeZoomY        (wxSpinEvent&);
  void onChangeSharpen      (wxCommandEvent&);
  void onChangeSharpenAmount(wxScrollEvent&);
  
  // Something changed in the selector control, update controls and selection displays
  void onSliceChange(wxCommandEvent&);
  
  // --------------------------------------------------- : Updating
  
  // The manual controls were changed
  void onUpdateFromControl(PreferedProperty prefer = PREFER_NONE);
  // Update the values in the controls
  void updateControls();
};


// ----------------------------------------------------------------------------- : ImageSlicePreview

/// A preview of the sliced image
class ImageSlicePreview : public wxControl {
public:
  ImageSlicePreview(Window* parent, int id, ImageSlice& slice, const AlphaMask& mask);
  
  /// Notify that the slice was updated
  void update();
  
  // --------------------------------------------------- : Data
private:
  Bitmap bitmap;
  ImageSlice& slice;
  const AlphaMask& mask;
  
  bool mouse_down;
  int mouseX, mouseY;     ///< starting mouse position
  wxRect start_selection; ///< selection in slice at start of dragging
  
  // --------------------------------------------------- : Events
  DECLARE_EVENT_TABLE();
  
  wxSize getBestSliceSize() const;
  wxSize DoGetBestSize() const override;
  
  void onLeftDown(wxMouseEvent&);
  void onLeftUp  (wxMouseEvent&);
  void onMotion  (wxMouseEvent&);
  void onLoseCapture(wxMouseCaptureLostEvent&);
  
  void onPaint(wxPaintEvent&);
  void draw(DC& dc);
};

// ----------------------------------------------------------------------------- : ImageSliceSelector

// A overview of the slicing of the image, allows to select the sliced area
class ImageSliceSelector : public wxControl {
public:
  ImageSliceSelector(Window* parent, int id, ImageSlice& slice);
  
  /// Notify that the slice was updated
  void update();
  
  // --------------------------------------------------- : Data
private:
  ImageSlice& slice;
  Bitmap bitmap, bitmap_no_sel;  ///< Bitmaps showing selection
  
  bool mouse_down;
  int mouseX, mouseY;      ///< starting mouse position
  int dragX,  dragY;      ///< corner that is being dragged
  wxRect start_selection;    ///< selection in slice at start of dragging
  double scaleX, scaleY;    ///< Amount the source image is scaled to fit in this control
  static const int border = 8;
  
  // --------------------------------------------------- : Events
  DECLARE_EVENT_TABLE();
  
  void onLeftDown(wxMouseEvent&);
  void onLeftUp  (wxMouseEvent&);
  void onMotion  (wxMouseEvent&);
  void onLoseCapture(wxMouseCaptureLostEvent&);
  
  void onPaint(wxPaintEvent&);
  void onSize(wxSizeEvent&);
  
  // Is the mouse on a (scale) handle?
  bool onHandle(const wxMouseEvent& ev, int dx, int dy) const;
  // Is the mouse on any handle?
  bool onAnyHandle(const wxMouseEvent& ev, int* dxOut, int* dyOut) const;
  // Return the position of a handle, dx,dy in {-1,0,1}
  wxPoint handlePos(int dx, int dy) const;
  
  void draw(DC& dc);
  // Draw a handle, dx and dy indicate the side, can be {-1,0,1}
  void drawHandle(DC& dc, int dx, int dy);
  void createBitmap();
  
  
};