dialog_color_picker.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2018-2022 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
 
 
#include <dialogs/dialog_color_picker.h>
#include <cmath>
#include <algorithm>
#include <kiface_base.h>
#include <settings/app_settings.h>
#include <widgets/color_swatch.h>
#include <wx/bitmap.h>
#include <wx/dcmemory.h>
 
#define ALPHA_MAX 100 // the max value returned by the alpha (opacity) slider
 
using KIGFX::COLOR4D;
 
// Configure the spin controls contained inside the dialog
void configureSpinCtrl( wxSpinCtrl* aCtrl )
{
 wxSize textLength = aCtrl->GetTextExtent( "999" );
 wxSize ctrlSize = aCtrl->GetSizeFromTextSize( textLength );
 
 aCtrl->SetMinSize( ctrlSize );
 aCtrl->SetSize( ctrlSize );
}
 
 
DIALOG_COLOR_PICKER::DIALOG_COLOR_PICKER( wxWindow* aParent, const COLOR4D& aCurrentColor,
 bool aAllowOpacityControl,
 CUSTOM_COLORS_LIST* aUserColors,
 const COLOR4D& aDefaultColor ) :
 DIALOG_COLOR_PICKER_BASE( aParent )
{
 m_allowMouseEvents = false;
 m_allowOpacityCtrl = aAllowOpacityControl;
 m_previousColor4D = aCurrentColor;
 m_newColor4D = aCurrentColor;
 m_cursorsSize = 8; // Size of square cursors drawn on color bitmaps
 m_newColor4D.ToHSV( m_hue, m_sat, m_val, true );
 m_bitmapRGB = nullptr;
 m_bitmapHSV = nullptr;
 m_selectedCursor = nullptr;
 m_defaultColor = aDefaultColor;
 
 if( !m_allowOpacityCtrl )
 {
 m_SizerTransparency->Show( false );
 
 if( aCurrentColor != COLOR4D::UNSPECIFIED )
 {
 m_previousColor4D.a = 1.0;
 m_newColor4D.a = 1.0;
 }
 }
 
 // UNSPECIFIED is ( 0, 0, 0, 0 ) but that is unfriendly for editing because you have to notice
 // first that the value slider is all the way down before you get any color
 if( aCurrentColor == COLOR4D::UNSPECIFIED )
 m_val = 1.0;
 
 APP_SETTINGS_BASE* cfg = Kiface().KifaceSettings();
 wxASSERT( cfg );
 
 m_notebook->SetSelection( cfg->m_ColorPicker.default_tab );
 
 // Build the defined colors panel:
 initDefinedColors( aUserColors );
 
 if( aDefaultColor == COLOR4D::UNSPECIFIED )
 m_resetToDefault->SetLabel( _( "Clear Color" ) );
 
 SetupStandardButtons();
}
 
 
DIALOG_COLOR_PICKER::~DIALOG_COLOR_PICKER()
{
 APP_SETTINGS_BASE* cfg = Kiface().KifaceSettings();
 wxASSERT( cfg );
 
 cfg->m_ColorPicker.default_tab = m_notebook->GetSelection();
 
 delete m_bitmapRGB;
 delete m_bitmapHSV;
 
 for( wxStaticBitmap* swatch : m_colorSwatches )
 {
 swatch->Disconnect( wxEVT_COMMAND_BUTTON_CLICKED,
 wxMouseEventHandler( DIALOG_COLOR_PICKER::buttColorClick ),
 nullptr, this );
 }
}
 
 
void DIALOG_COLOR_PICKER::updatePreview( wxStaticBitmap* aStaticBitmap, COLOR4D& aColor4D )
{
 wxBitmap newBm = COLOR_SWATCH::MakeBitmap( aColor4D, COLOR4D::WHITE, aStaticBitmap->GetSize(),
 ConvertDialogToPixels( CHECKERBOARD_SIZE_DU ),
 aStaticBitmap->GetParent()->GetBackgroundColour() );
 aStaticBitmap->SetBitmap( newBm );
}
 
 
bool DIALOG_COLOR_PICKER::TransferDataToWindow()
{
 // Draw all bitmaps, with colors according to the color 4D
 updatePreview( m_OldColorRect, m_previousColor4D );
 SetEditVals( ALL_CHANGED, false );
 drawAll();
 
 // Configure the spin control sizes
 configureSpinCtrl( m_spinCtrlGreen );
 configureSpinCtrl( m_spinCtrlBlue );
 configureSpinCtrl( m_spinCtrlRed );
 configureSpinCtrl( m_spinCtrlHue );
 configureSpinCtrl( m_spinCtrlSaturation );
 
 m_notebook->GetPage( 0 )->Layout();
 m_notebook->GetPage( 1 )->Layout();
 
 finishDialogSettings();
 
 return true;
}
 
 
void DIALOG_COLOR_PICKER::initDefinedColors( CUSTOM_COLORS_LIST* aPredefinedColors )
{
 #define ID_COLOR_BLACK 2000 // colors_id = ID_COLOR_BLACK a ID_COLOR_BLACK + NBCOLORS-1
 
 // Colors are built from the colorRefs() table (size NBCOLORS).
 // The look is better when colorRefs() order is displayed in a grid matrix
 // of 7 row and 5 columns, first filling a row, and after the next column.
 // But the wxFlexGrid used here must be filled by columns, then next row
 // the best interval colorRefs() from a matrix row to the next row is 6
 // So when have to reorder the index used to explore colorRefs()
 int grid_col = 0;
 int grid_row = 0;
 int table_row_count = 7;
 
 wxSize swatchSize = ConvertDialogToPixels( SWATCH_SIZE_LARGE_DU );
 wxSize checkerboardSize = ConvertDialogToPixels( CHECKERBOARD_SIZE_DU );
 COLOR4D checkboardBackground = m_OldColorRect->GetParent()->GetBackgroundColour();
 
 auto addSwatch =
 [&]( int aId, COLOR4D aColor, const wxString& aColorName )
 {
 wxBitmap bm = COLOR_SWATCH::MakeBitmap( aColor, COLOR4D::WHITE, swatchSize,
 checkerboardSize, checkboardBackground );
 wxStaticBitmap* swatch = new wxStaticBitmap( m_panelDefinedColors, aId, bm );
 
 m_fgridColor->Add( swatch, 0, wxALIGN_CENTER_VERTICAL, 5 );
 
 wxStaticText* label = new wxStaticText( m_panelDefinedColors, wxID_ANY, aColorName,
 wxDefaultPosition, wxDefaultSize, 0 );
 m_fgridColor->Add( label, 1, wxALIGN_CENTER_VERTICAL | wxRIGHT, 15 );
 
 m_colorSwatches.push_back( swatch );
 
 swatch->Connect( wxEVT_LEFT_DOWN,
 wxMouseEventHandler( DIALOG_COLOR_PICKER::buttColorClick ),
 nullptr, this );
 swatch->Connect( wxEVT_LEFT_DCLICK,
 wxMouseEventHandler( DIALOG_COLOR_PICKER::colorDClick ),
 nullptr, this );
 };
 
 // If no predefined list is given, build the default predefined colors:
 if( aPredefinedColors )
 {
 for( unsigned jj = 0; jj < aPredefinedColors->size() && jj < NBCOLORS; ++jj )
 {
 CUSTOM_COLOR_ITEM* item = & *aPredefinedColors->begin() + jj;
 int butt_ID = ID_COLOR_BLACK + jj;
 
 addSwatch( butt_ID, item->m_Color, item->m_ColorName );
 m_Color4DList.push_back( item->m_Color );
 }
 }
 else
 {
 m_Color4DList.assign( NBCOLORS, COLOR4D( 0.0, 0.0, 0.0, 1.0 ) );
 
 for( int jj = 0; jj < NBCOLORS; ++jj, grid_col++ )
 {
 if( grid_col * table_row_count >= NBCOLORS )
 {
 // the current grid row is filled, and we must fill the next grid row
 grid_col = 0;
 grid_row++;
 }
 
 int ii = grid_row + ( grid_col * table_row_count ); // The index in colorRefs()
 int butt_ID = ID_COLOR_BLACK + ii;
 COLOR4D buttcolor = COLOR4D( colorRefs()[ii].m_Numcolor );
 
 addSwatch( butt_ID, buttcolor, wxGetTranslation( colorRefs()[ii].m_ColorName ) );
 m_Color4DList[ butt_ID - ID_COLOR_BLACK ] = buttcolor;
 }
 }
}
 
 
void DIALOG_COLOR_PICKER::createRGBBitmap()
{
 wxSize bmsize = m_RgbBitmap->GetSize();
 int half_size = std::min( bmsize.x, bmsize.y )/2;
 
 // We use here a Y axis from bottom to top and origin to center, So we need to map
 // coordinated to write pixel in a wxImage. MAPX and MAPY are defined above so they
 // must be undefined here to prevent compiler warnings.
#undef MAPX
#undef MAPY
#define MAPX( xx ) bmsize.x / 2 + ( xx )
#define MAPY( yy ) bmsize.y / 2 - ( yy )
 
 // Reserve room to draw cursors inside the bitmap
 half_size -= m_cursorsSize/2;
 
 COLOR4D color;
 
 // Red blue area in X Z 3d axis
 double inc = 255.0 / half_size;
 #define SLOPE_AXIS 50.0
 double slope = SLOPE_AXIS/half_size;
 color.g = 0.0;
 
 wxImage img( bmsize ); // a temporary buffer to build the color map
 
 // clear background (set the window bg color)
 wxColor bg = GetBackgroundColour();
 
 // Don't do standard-color lookups on OSX each time through the loop
 wxColourBase::ChannelType bgR = bg.Red();
 wxColourBase::ChannelType bgG = bg.Green();
 wxColourBase::ChannelType bgB = bg.Blue();
 
 for( int xx = 0; xx < bmsize.x; xx++ ) // blue axis
 {
 for( int yy = 0; yy < bmsize.y; yy++ ) // Red axis
 img.SetRGB( xx, yy, bgR, bgG, bgB );
 }
 
 // Build the palette
 for( int xx = 0; xx < half_size; xx++ ) // blue axis
 {
 color.b = inc * xx;
 
 for( int yy = 0; yy < half_size; yy++ ) // Red axis
 {
 color.r = inc * yy;
 img.SetRGB( MAPX( xx ), MAPY( yy - (slope*xx) ), color.r, color.g, color.b );
 }
 }
 
 // Red green area in y Z 3d axis
 color.b = 0.0;
 
 for( int xx = 0; xx < half_size; xx++ ) // green axis
 {
 color.g = inc * xx;
 
 for( int yy = 0; yy < half_size; yy++ ) // Red axis
 {
 color.r = inc * yy;
 img.SetRGB( MAPX( -xx ), MAPY( yy - (slope*xx) ), color.r, color.g, color.b );
 }
 }
 
 // Blue green area in x y 3d axis
 color.r = 0.0;
 
 for( int xx = 0; xx < half_size; xx++ ) // green axis
 {
 color.g = inc * xx;
 
 for( int yy = 0; yy < half_size; yy++ ) // blue axis
 {
 color.b = inc * yy;
 
 // Mapping the xx, yy color axis to draw coordinates is more tricky than previously
 // in DC coordinates:
 // the blue axis is the (0, 0) to half_size, (-yy - SLOPE_AXIS)
 // the green axis is the (0, 0) to - half_size, (-yy - SLOPE_AXIS)
 int drawX = -xx + yy;
 int drawY = - std::min( xx,yy ) * 0.9;
 img.SetRGB( MAPX( drawX ), MAPY( drawY - std::abs( slope*drawX ) ),
 color.r, color.g, color.b );
 }
 }
 
 delete m_bitmapRGB;
 m_bitmapRGB = new wxBitmap( img, 24 );
 m_RgbBitmap->SetBitmap( *m_bitmapRGB );
}
 
 
void DIALOG_COLOR_PICKER::createHSVBitmap()
{
 wxSize bmsize = m_HsvBitmap->GetSize();
 int half_size = std::min( bmsize.x, bmsize.y )/2;
 
 // We use here a Y axis from bottom to top and origin to center, So we need to map
 // coordinated to write pixel in a wxImage
 #define MAPX( xx ) bmsize.x / 2 + ( xx )
 #define MAPY( yy ) bmsize.y / 2 - ( yy )
 
 wxImage img( bmsize ); // a temporary buffer to build the color map
 
 // clear background (set the window bg color)
 wxColor bg = GetBackgroundColour();
 
 // Don't do standard-color lookups on OSX each time through the loop
 wxColourBase::ChannelType bgR = bg.Red();
 wxColourBase::ChannelType bgG = bg.Green();
 wxColourBase::ChannelType bgB = bg.Blue();
 
 for( int xx = 0; xx < bmsize.x; xx++ ) // blue axis
 {
 for( int yy = 0; yy < bmsize.y; yy++ ) // Red axis
 img.SetRGB( xx, yy, bgR, bgG, bgB );
 }
 
 // Reserve room to draw cursors inside the bitmap
 half_size -= m_cursorsSize/2;
 
 double hue, sat;
 COLOR4D color;
 int sq_radius = half_size*half_size;
 
 // Build the palette
 for( int xx = -half_size; xx < half_size; xx++ )
 {
 for( int yy = -half_size; yy < half_size; yy++ )
 {
 sat = double(xx*xx + yy*yy) / sq_radius;
 
 // sat is <= 1.0
 // any value > 1.0 is not a valid HSB color:
 if( sat > 1.0 )
 continue;
 
 // sat is the distance from center
 sat = sqrt( sat );
 hue = atan2( (double)yy, (double)xx ) * 180 / M_PI;
 
 if( hue < 0.0 )
 hue += 360.0;
 
 color.FromHSV( hue, sat, 1.0 );
 
 img.SetRGB( MAPX( xx ), MAPY( yy ), color.r*255, color.g*255, color.b*255 );
 }
 }
 
 delete m_bitmapHSV;
 m_bitmapHSV = new wxBitmap( img, 24 );
 m_HsvBitmap->SetBitmap( *m_bitmapHSV );
}
 
 
void DIALOG_COLOR_PICKER::drawRGBPalette()
{
 if( !m_bitmapRGB || m_bitmapRGB->GetSize() != m_RgbBitmap->GetSize() )
 createRGBBitmap();
 
 wxMemoryDC bitmapDC;
 wxSize bmsize = m_bitmapRGB->GetSize();
 int half_size = std::min( bmsize.x, bmsize.y )/2;
 wxBitmap newBm( *m_bitmapRGB );
 bitmapDC.SelectObject( newBm );
 
 // Use Y axis from bottom to top and origin to center
 bitmapDC.SetAxisOrientation( true, true );
#if wxCHECK_VERSION( 3, 1, 7 ) && defined( __WXMSW__)
 // For some reason, SetDeviceOrigin has changed in wxWidgets 3.1.6 or 3.1.7
 bitmapDC.SetDeviceOrigin( half_size, -half_size );
#else
 bitmapDC.SetDeviceOrigin( half_size, half_size );
#endif
 
 // Reserve room to draw cursors inside the bitmap
 half_size -= m_cursorsSize/2;
 
 // Draw the 3 RGB cursors, using white color to make them always visible:
 wxPen pen( wxColor( 255, 255, 255 ), 2 ); // use 2 pixels for pen size
 wxBrush brush( wxColor( 0, 0, 0 ), wxBRUSHSTYLE_TRANSPARENT );
 bitmapDC.SetPen( pen );
 bitmapDC.SetBrush( brush );
 int half_csize = m_cursorsSize / 2;
 
 #define SLOPE_AXIS 50.0
 double slope = SLOPE_AXIS / half_size;
 
 // Red axis cursor (Z 3Daxis):
 m_cursorBitmapRed.x = 0;
 m_cursorBitmapRed.y = m_newColor4D.r * half_size;
 bitmapDC.DrawRectangle( m_cursorBitmapRed.x - half_csize,
 m_cursorBitmapRed.y - half_csize,
 m_cursorsSize, m_cursorsSize );
 
 // Blue axis cursor (X 3Daxis):
 m_cursorBitmapBlue.x = m_newColor4D.b * half_size;
 m_cursorBitmapBlue.y = - slope*m_cursorBitmapBlue.x;
 bitmapDC.DrawRectangle( m_cursorBitmapBlue.x - half_csize,
 m_cursorBitmapBlue.y - half_csize,
 m_cursorsSize, m_cursorsSize );
 
 // Green axis cursor (Y 3Daxis):
 m_cursorBitmapGreen.x = m_newColor4D.g * half_size;
 m_cursorBitmapGreen.y = - slope * m_cursorBitmapGreen.x;
 m_cursorBitmapGreen.x = -m_cursorBitmapGreen.x;
 
 bitmapDC.DrawRectangle( m_cursorBitmapGreen.x - half_csize,
 m_cursorBitmapGreen.y - half_csize,
 m_cursorsSize, m_cursorsSize );
 
 // Draw the 3 RGB axis:
 half_size += half_size/5;
 bitmapDC.DrawLine( 0, 0, 0, half_size ); // Red axis (Z 3D axis)
 bitmapDC.DrawLine( 0, 0, half_size, - half_size*slope ); // Blue axis (X 3D axis)
 bitmapDC.DrawLine( 0, 0, -half_size, - half_size*slope ); // green axis (Y 3D axis)
 
 m_RgbBitmap->SetBitmap( newBm );
 
 /* Deselect the Tool Bitmap from DC,
 * in order to delete the MemoryDC safely without deleting the bitmap */
 bitmapDC.SelectObject( wxNullBitmap );
}
 
 
void DIALOG_COLOR_PICKER::drawHSVPalette()
{
 if( !m_bitmapHSV || m_bitmapHSV->GetSize() != m_HsvBitmap->GetSize() )
 createHSVBitmap();
 
 wxMemoryDC bitmapDC;
 wxSize bmsize = m_bitmapHSV->GetSize();
 int half_size = std::min( bmsize.x, bmsize.y ) / 2;
 wxBitmap newBm( *m_bitmapHSV );
 bitmapDC.SelectObject( newBm );
 
 // Use Y axis from bottom to top and origin to center
 bitmapDC.SetAxisOrientation( true, true );
#if wxCHECK_VERSION( 3, 1, 7 ) && defined( __WXMSW__)
 // For some reason, SetDeviceOrigin has changed in wxWidgets 3.1.6 or 3.1.7
 bitmapDC.SetDeviceOrigin( half_size, -half_size );
#else
 bitmapDC.SetDeviceOrigin( half_size, half_size );
#endif
 
 // Reserve room to draw cursors inside the bitmap
 half_size -= m_cursorsSize / 2;
 
 // Draw the HSB cursor:
 m_cursorBitmapHSV.x = cos( m_hue * M_PI / 180.0 ) * half_size * m_sat;
 m_cursorBitmapHSV.y = sin( m_hue * M_PI / 180.0 ) * half_size * m_sat;
 
 wxPen pen( wxColor( 0, 0, 0 ), 2 ); // Use 2 pixels as pensize
 wxBrush brush( wxColor( 0, 0, 0 ), wxBRUSHSTYLE_TRANSPARENT );
 bitmapDC.SetPen( pen );
 bitmapDC.SetBrush( brush );
 
 int half_csize = m_cursorsSize/2;
 bitmapDC.DrawRectangle( m_cursorBitmapHSV.x- half_csize,
 m_cursorBitmapHSV.y-half_csize,
 m_cursorsSize, m_cursorsSize );
 
 m_HsvBitmap->SetBitmap( newBm );
 
 /* Deselect the Tool Bitmap from DC,
 * in order to delete the MemoryDC safely without deleting the bitmap
 */
 bitmapDC.SelectObject( wxNullBitmap );
}
 
 
void DIALOG_COLOR_PICKER::SetEditVals( CHANGED_COLOR aChanged, bool aCheckTransparency )
{
 if( aCheckTransparency )
 {
 // If they've changed the color, they probably don't want it to remain 100% transparent,
 // and it looks like a bug when changing the color has no effect.
 if( m_newColor4D.a == 0.0 )
 m_newColor4D.a = 1.0;
 }
 
 m_sliderTransparency->SetValue( normalizeToInt( m_newColor4D.a, ALPHA_MAX ) );
 
 if( aChanged == RED_CHANGED || aChanged == GREEN_CHANGED || aChanged == BLUE_CHANGED )
 m_newColor4D.ToHSV( m_hue, m_sat, m_val, true );
 
 if( aChanged != RED_CHANGED )
 m_spinCtrlRed->SetValue( normalizeToInt( m_newColor4D.r ) );
 
 if( aChanged != GREEN_CHANGED )
 m_spinCtrlGreen->SetValue( normalizeToInt( m_newColor4D.g ) );
 
 if( aChanged != BLUE_CHANGED )
 m_spinCtrlBlue->SetValue( normalizeToInt( m_newColor4D.b ) );
 
 if( aChanged != HUE_CHANGED )
 m_spinCtrlHue->SetValue( (int)m_hue );
 
 if( aChanged != SAT_CHANGED )
 m_spinCtrlSaturation->SetValue( m_sat * 255 );
 
 if( aChanged != VAL_CHANGED )
 m_sliderBrightness->SetValue(normalizeToInt( m_val ) );
 
 if( aChanged == HEX_CHANGED )
 m_sliderTransparency->SetValue( normalizeToInt( m_newColor4D.a, ALPHA_MAX ) );
 else
 m_colorValue->ChangeValue( m_newColor4D.ToHexString() );
}
 
 
void DIALOG_COLOR_PICKER::drawAll()
{
 m_NewColorRect->Freeze(); // Avoid flicker
 m_HsvBitmap->Freeze();
 m_RgbBitmap->Freeze();
 updatePreview( m_NewColorRect, m_newColor4D );
 drawHSVPalette();
 drawRGBPalette();
 m_NewColorRect->Thaw();
 m_HsvBitmap->Thaw();
 m_RgbBitmap->Thaw();
 m_NewColorRect->Refresh();
 m_HsvBitmap->Refresh();
 m_RgbBitmap->Refresh();
}
 
 
void DIALOG_COLOR_PICKER::colorDClick( wxMouseEvent& event )
{
 wxPostEvent( this, wxCommandEvent( wxEVT_COMMAND_BUTTON_CLICKED, wxID_OK ) );
}
 
 
void DIALOG_COLOR_PICKER::buttColorClick( wxMouseEvent& event )
{
 int id = event.GetId();
 COLOR4D color( m_Color4DList[id - ID_COLOR_BLACK] );
 m_newColor4D.r = color.r;
 m_newColor4D.g = color.g;
 m_newColor4D.b = color.b;
 m_newColor4D.a = color.a;
 
 m_newColor4D.ToHSV( m_hue, m_sat, m_val, true );
 SetEditVals( ALL_CHANGED, false );
 
 drawAll();
 
 event.Skip();
}
 
 
void DIALOG_COLOR_PICKER::onRGBMouseClick( wxMouseEvent& event )
{
 m_allowMouseEvents = true;
 wxPoint mousePos = event.GetPosition();
 
 // The cursor position is relative to the m_bitmapHSV wxBitmap center
 wxSize bmsize = m_bitmapRGB->GetSize();
 int half_size = std::min( bmsize.x, bmsize.y ) / 2;
 mousePos.x -= half_size;
 mousePos.y -= half_size;
 mousePos.y = -mousePos.y; // Use the bottom to top vertical axis
 
 wxPoint dist = m_cursorBitmapRed - mousePos;
 
 if( std::abs( dist.x ) <= m_cursorsSize/2 && std::abs( dist.y ) <= m_cursorsSize/2 )
 {
 m_selectedCursor = &m_cursorBitmapRed;
 return;
 }
 
 dist = m_cursorBitmapGreen - mousePos;
 
 if( std::abs( dist.x ) <= m_cursorsSize/2 && std::abs( dist.y ) <= m_cursorsSize/2 )
 {
 m_selectedCursor = &m_cursorBitmapGreen;
 return;
 }
 
 dist = m_cursorBitmapBlue - mousePos;
 
 if( std::abs( dist.x ) <= m_cursorsSize/2 && std::abs( dist.y ) <= m_cursorsSize/2 )
 {
 m_selectedCursor = &m_cursorBitmapBlue;
 return;
 }
 
 m_selectedCursor = nullptr;
}
 
 
void DIALOG_COLOR_PICKER::onRGBMouseDrag( wxMouseEvent& event )
{
 if( !event.Dragging() || !m_allowMouseEvents )
 {
 m_selectedCursor = nullptr;
 return;
 }
 
 if( m_selectedCursor != &m_cursorBitmapRed
 && m_selectedCursor != &m_cursorBitmapGreen
 && m_selectedCursor != &m_cursorBitmapBlue )
 {
 return;
 }
 
 // Adjust the HSV cursor position to follow the mouse cursor
 // The cursor position is relative to the m_bitmapHSV wxBitmap center
 wxPoint mousePos = event.GetPosition();
 wxSize bmsize = m_bitmapRGB->GetSize();
 int half_size = std::min( bmsize.x, bmsize.y ) / 2;
 mousePos.x -= half_size;
 mousePos.y -= half_size;
 mousePos.y = -mousePos.y; // Use the bottom to top vertical axis
 
 half_size -= m_cursorsSize / 2; // the actual half_size of the palette area
 
 // Change colors according to the selected cursor:
 if( m_selectedCursor == &m_cursorBitmapRed )
 {
 if( mousePos.y >= 0 && mousePos.y <= half_size )
 m_newColor4D.r = (double)mousePos.y / half_size;
 else
 return;
 }
 
 if( m_selectedCursor == &m_cursorBitmapGreen )
 {
 mousePos.x = -mousePos.x;
 
 if( mousePos.x >= 0 && mousePos.x <= half_size )
 m_newColor4D.g = (double)mousePos.x / half_size;
 else
 return;
 }
 
 if( m_selectedCursor == &m_cursorBitmapBlue )
 {
 if( mousePos.x >= 0 && mousePos.x <= half_size )
 m_newColor4D.b = (double)mousePos.x / half_size;
 else
 return;
 }
 
 m_newColor4D.ToHSV( m_hue, m_sat, m_val, true );
 SetEditVals( ALL_CHANGED, true );
 
 drawAll();
}
 
 
void DIALOG_COLOR_PICKER::onHSVMouseClick( wxMouseEvent& event )
{
 m_allowMouseEvents = true;
 
 if( setHSvaluesFromCursor( event.GetPosition() ) )
 drawAll();
}
 
 
void DIALOG_COLOR_PICKER::onHSVMouseDrag( wxMouseEvent& event )
{
 if( !event.Dragging() || !m_allowMouseEvents )
 return;
 
 if( setHSvaluesFromCursor( event.GetPosition() ) )
 drawAll();
}
 
 
void DIALOG_COLOR_PICKER::OnColorValueText( wxCommandEvent& event )
{
 if( m_newColor4D.SetFromHexString( m_colorValue->GetValue() ) )
 {
 m_newColor4D.ToHSV( m_hue, m_sat, m_val, true );
 
 SetEditVals( HEX_CHANGED, false );
 drawAll();
 }
}
 
 
bool DIALOG_COLOR_PICKER::setHSvaluesFromCursor( const wxPoint& aMouseCursor )
{
 wxPoint mousePos = aMouseCursor;
 wxSize bmsize = m_bitmapHSV->GetSize();
 int half_size = std::min( bmsize.x, bmsize.y )/2;
 
 // Make the cursor position relative to the m_bitmapHSV wxBitmap center
 mousePos.x -= half_size;
 mousePos.y -= half_size;
 mousePos.y = -mousePos.y; // Use the bottom to top vertical axis
 
 // The HS cursor position is restricted to a circle of radius half_size
 double dist_from_centre = hypot( (double)mousePos.x, (double)mousePos.y );
 
 if( dist_from_centre > half_size )
 {
 // Saturation cannot be calculated:
 return false;
 }
 
 m_cursorBitmapHSV = mousePos;
 
 // Set saturation and hue from new cursor position:
 half_size -= m_cursorsSize / 2; // the actual half_size of the palette area
 m_sat = dist_from_centre / half_size;
 
 if( m_sat > 1.0 )
 m_sat = 1.0;
 
 m_hue = atan2( mousePos.y, mousePos.x ) / M_PI * 180.0;
 
 if( m_hue < 0 )
 m_hue += 360.0;
 
 m_newColor4D.FromHSV( m_hue, m_sat, m_val );
 SetEditVals( ALL_CHANGED, true );
 
 return true;
}
 
 
void DIALOG_COLOR_PICKER::OnChangeAlpha( wxScrollEvent& event )
{
 double alpha = (double)event.GetPosition() / ALPHA_MAX;
 m_newColor4D.a = alpha;
 m_NewColorRect->Freeze(); // Avoid flicker
 updatePreview( m_NewColorRect, m_newColor4D );
 m_NewColorRect->Thaw();
 m_NewColorRect->Refresh();
 SetEditVals( ALPHA_CHANGED, false );
}
 
 
void DIALOG_COLOR_PICKER::OnChangeEditRed( wxSpinEvent& event )
{
 double val = (double)event.GetPosition() / 255.0;
 m_newColor4D.r = val;
 SetEditVals( RED_CHANGED, true );
 
 drawAll();
}
 
 
void DIALOG_COLOR_PICKER::OnChangeEditGreen( wxSpinEvent& event )
{
 double val = (double)event.GetPosition() / 255.0;
 m_newColor4D.g = val;
 SetEditVals( GREEN_CHANGED, true );
 
 drawAll();
}
 
 
void DIALOG_COLOR_PICKER::OnChangeEditBlue( wxSpinEvent& event )
{
 double val = (double)event.GetPosition() / 255.0;
 m_newColor4D.b = val;
 SetEditVals( BLUE_CHANGED, true );
 
 drawAll();
}
 
 
void DIALOG_COLOR_PICKER::OnChangeEditHue( wxSpinEvent& event )
{
 m_hue = (double)event.GetPosition();
 
 m_newColor4D.FromHSV( m_hue, m_sat, m_val );
 
 SetEditVals( HUE_CHANGED, true );
 
 drawAll();
}
 
 
void DIALOG_COLOR_PICKER::OnChangeEditSat( wxSpinEvent& event )
{
 m_sat = (double)event.GetPosition() / 255.0;
 
 m_newColor4D.FromHSV( m_hue, m_sat, m_val );
 
 SetEditVals( SAT_CHANGED, true );
 
 drawAll();
}
 
 
void DIALOG_COLOR_PICKER::OnChangeBrightness( wxScrollEvent& event )
{
 m_val = (double)event.GetPosition() / 255.0;
 
 m_newColor4D.FromHSV( m_hue, m_sat, m_val );
 
 SetEditVals( VAL_CHANGED, true );
 
 drawAll();
}
 
 
void DIALOG_COLOR_PICKER::OnResetButton( wxCommandEvent& aEvent )
{
 m_newColor4D.r = m_defaultColor.r;
 m_newColor4D.g = m_defaultColor.g;
 m_newColor4D.b = m_defaultColor.b;
 m_newColor4D.a = m_defaultColor.a;
 
 m_newColor4D.ToHSV( m_hue, m_sat, m_val, true );
 SetEditVals( ALL_CHANGED, false );
 
 drawAll();
}