src/generic/plot.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        plot.cpp
   3 // Purpose:     wxPlotWindow
   4 // Author:      Robert Roebling
   5 // Modified by:
   6 // Created:     12/01/2000
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Robert Roebling
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "plot.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24 #include "wx/object.h"
  25 #include "wx/font.h"
  26 #include "wx/colour.h"
  27 #include "wx/settings.h"
  28 #include "wx/sizer.h"
  29 #include "wx/log.h"
  30 #include "wx/intl.h"
  31 #include "wx/dcclient.h"
  32 #endif
  33
  34 #include "wx/generic/plot.h"
  35
  36 #include <math.h>
  37
  38 //-----------------------------------------------------------------------------
  39 // wxPlotCurve
  40 //-----------------------------------------------------------------------------
  41
  42 IMPLEMENT_ABSTRACT_CLASS(wxPlotCurve, wxObject)
  43
  44 wxPlotCurve::wxPlotCurve( int offsetY, double startY, double endY )
  45 {
  46     m_offsetY = offsetY;
  47     m_startY = startY;
  48     m_endY = endY;
  49 }
  50
  51 //-----------------------------------------------------------------------------
  52 // wxPlotArea
  53 //-----------------------------------------------------------------------------
  54
  55 IMPLEMENT_DYNAMIC_CLASS(wxPlotArea, wxWindow)
  56
  57 BEGIN_EVENT_TABLE(wxPlotArea, wxWindow)
  58   EVT_PAINT(        wxPlotArea::OnPaint)
  59   EVT_LEFT_DOWN(    wxPlotArea::OnMouse)
  60 END_EVENT_TABLE()
  61
  62 wxPlotArea::wxPlotArea( wxPlotWindow *parent )
  63         : wxWindow( parent, -1, wxDefaultPosition, wxDefaultSize, wxSIMPLE_BORDER, "plotarea" )
  64 {
  65     m_owner = parent;
  66
  67     SetBackgroundColour( *wxWHITE );
  68 }
  69
  70 void wxPlotArea::OnMouse( wxMouseEvent &event )
  71 {
  72     int client_width;
  73     int client_height;
  74     GetClientSize( &client_width, &client_height);
  75     int view_x;
  76     int view_y;
  77     m_owner->GetViewStart( &view_x, &view_y );
  78     view_x *= 10;
  79     view_y *= 10;
  80
  81     int x = event.GetX();
  82     int y = event.GetY();
  83     x += view_x;
  84     y += view_y;
  85
  86     wxNode *node = m_owner->m_curves.First();
  87     while (node)
  88     {
  89         wxPlotCurve *curve = (wxPlotCurve*)node->Data();
  90
  91         double double_client_height = (double)client_height;
  92         double range = curve->GetEndY() - curve->GetStartY();
  93         double end = curve->GetEndY();
  94         wxCoord offset_y = curve->GetOffsetY();
  95
  96         double dy = (end - curve->GetY( x )) / range;
  97         wxCoord curve_y = (wxCoord)(dy * double_client_height) - offset_y - 1;
  98
  99         if ((y-curve_y < 4) && (y-curve_y > -4))
 100         {
 101             m_owner->SetCurrent( curve );
 102             return;
 103         }
 104
 105         node = node->Next();
 106     }
 107 }
 108
 109 void wxPlotArea::DeleteCurve( wxPlotCurve *curve, int from, int to )
 110 {
 111     wxClientDC dc(this);
 112     m_owner->PrepareDC( dc );
 113     dc.SetPen( *wxWHITE_PEN );
 114     DrawCurve( &dc, curve, from, to );
 115 }
 116
 117 void wxPlotArea::DrawCurve( wxDC *dc, wxPlotCurve *curve, int from, int to )
 118 {
 119     int view_x;
 120     int view_y;
 121     m_owner->GetViewStart( &view_x, &view_y );
 122     view_x *= 10;
 123
 124     if (from == -1)
 125         from = view_x;
 126
 127     int client_width;
 128     int client_height;
 129     GetClientSize( &client_width, &client_height);
 130
 131     if (to == -1)
 132         to = view_x + client_width;
 133
 134     int start_x = wxMax( from, curve->GetStartX() );
 135     int end_x = wxMin( to, curve->GetEndX() );
 136
 137     start_x = wxMax( view_x, start_x );
 138     end_x = wxMin( view_x + client_width, end_x );
 139
 140     double double_client_height = (double)client_height;
 141     double range = curve->GetEndY() - curve->GetStartY();
 142     double end = curve->GetEndY();
 143     wxCoord offset_y = curve->GetOffsetY();
 144
 145     wxCoord y=0,last_y=0;
 146     for (int x = start_x; x < end_x; x++)
 147     {
 148         double dy = (end - curve->GetY( x )) / range;
 149         y = (wxCoord)(dy * double_client_height) - offset_y - 1;
 150
 151         if (x != start_x)
 152            dc->DrawLine( x-1, last_y, x, y );
 153
 154         last_y = y;
 155     }
 156 }
 157
 158 void wxPlotArea::OnPaint( wxPaintEvent &WXUNUSED(event) )
 159 {
 160     int view_x;
 161     int view_y;
 162     m_owner->GetViewStart( &view_x, &view_y );
 163     view_x *= 10;
 164     view_y *= 10;
 165
 166     wxPaintDC dc( this );
 167     m_owner->PrepareDC( dc );
 168
 169     wxRegionIterator upd( GetUpdateRegion() );
 170
 171     while (upd)
 172     {
 173         int update_x = upd.GetX();
 174         int update_y = upd.GetY();
 175         int update_width = upd.GetWidth();
 176
 177         update_x += view_x;
 178         update_y += view_y;
 179
 180 /*
 181         if (m_owner->m_current)
 182         {
 183             dc.SetPen( *wxLIGHT_GREY_PEN );
 184             int base_line = client_height - m_owner->m_current->GetOffsetY();
 185             dc.DrawLine( update_x-1, base_line-1, update_x+update_width+2, base_line-1 );
 186         }
 187 */
 188
 189         wxNode *node = m_owner->m_curves.First();
 190         while (node)
 191         {
 192             wxPlotCurve *curve = (wxPlotCurve*)node->Data();
 193
 194             if (curve == m_owner->GetCurrent())
 195                 dc.SetPen( *wxBLACK_PEN );
 196             else
 197                 dc.SetPen( *wxLIGHT_GREY_PEN );
 198
 199             DrawCurve( &dc, curve, update_x-1, update_x+update_width+2 );
 200
 201             node = node->Next();
 202         }
 203         upd ++;
 204     }
 205 }
 206
 207 //-----------------------------------------------------------------------------
 208 // wxPlotWindow
 209 //-----------------------------------------------------------------------------
 210
 211 #define  ID_ENLARGE_100   1000
 212 #define  ID_ENLARGE_50    1001
 213 #define  ID_SHRINK_33     1002
 214 #define  ID_SHRINK_50     1003
 215
 216 #define  ID_MOVE_UP       1006
 217 #define  ID_MOVE_DOWN     1007
 218
 219
 220 IMPLEMENT_DYNAMIC_CLASS(wxPlotWindow, wxScrolledWindow)
 221
 222 BEGIN_EVENT_TABLE(wxPlotWindow, wxScrolledWindow)
 223   EVT_PAINT(                   wxPlotWindow::OnPaint)
 224   EVT_BUTTON(  ID_MOVE_UP,     wxPlotWindow::OnMoveUp)
 225   EVT_BUTTON(  ID_MOVE_DOWN,   wxPlotWindow::OnMoveDown)
 226
 227   EVT_BUTTON(  ID_ENLARGE_100, wxPlotWindow::OnEnlarge100)
 228   EVT_BUTTON(  ID_ENLARGE_50,  wxPlotWindow::OnEnlarge50)
 229   EVT_BUTTON(  ID_SHRINK_50,   wxPlotWindow::OnShrink50)
 230   EVT_BUTTON(  ID_SHRINK_33,   wxPlotWindow::OnShrink33)
 231 END_EVENT_TABLE()
 232
 233 wxPlotWindow::wxPlotWindow( wxWindow *parent, wxWindowID id, const wxPoint &pos, const wxSize &size, int flag )
 234         : wxScrolledWindow( parent, id, pos, size, flag, "plotcanvas" )
 235 {
 236     m_area = new wxPlotArea( this );
 237
 238     wxBoxSizer *mainsizer = new wxBoxSizer( wxHORIZONTAL );
 239
 240     wxBoxSizer *buttonlist = new wxBoxSizer( wxVERTICAL );
 241     buttonlist->Add( new wxButton( this, ID_ENLARGE_100, _("+ 100%") ), 0, wxEXPAND|wxALL, 5 );
 242     buttonlist->Add( new wxButton( this, ID_ENLARGE_50, _("+ 50%") ), 0, wxEXPAND|wxALL, 5 );
 243     buttonlist->Add( new wxButton( this, ID_SHRINK_33, _("- 33%") ), 0, wxEXPAND|wxALL, 5 );
 244     buttonlist->Add( new wxButton( this, ID_SHRINK_50, _("- 50%") ), 0, wxEXPAND|wxALL, 5 );
 245     buttonlist->Add( 20,20, 0 );
 246     buttonlist->Add( new wxButton( this, ID_MOVE_UP, _("Up") ), 0, wxEXPAND|wxALL, 5 );
 247     buttonlist->Add( new wxButton( this, ID_MOVE_DOWN, _("Down") ), 0, wxEXPAND|wxALL, 5 );
 248     buttonlist->Add( 20,20, 1 );
 249
 250     mainsizer->Add( buttonlist, 0, wxEXPAND );
 251
 252     mainsizer->Add( m_area, 1, wxEXPAND|wxLEFT, 50 );
 253
 254     SetAutoLayout( TRUE );
 255     SetSizer( mainsizer );
 256
 257     SetTargetWindow( m_area );
 258
 259     SetBackgroundColour( *wxWHITE );
 260
 261     m_current = (wxPlotCurve*) NULL;
 262 }
 263
 264 wxPlotWindow::~wxPlotWindow()
 265 {
 266 }
 267
 268 void wxPlotWindow::Add( wxPlotCurve *curve )
 269 {
 270     m_curves.Append( curve );
 271     if (!m_current) m_current = curve;
 272 }
 273
 274 size_t wxPlotWindow::GetCount()
 275 {
 276     return m_curves.GetCount();
 277 }
 278
 279 wxPlotCurve *wxPlotWindow::GetAt( size_t n )
 280 {
 281     wxNode *node = m_curves.Nth( n );
 282     if (!node)
 283         return (wxPlotCurve*) NULL;
 284
 285     return (wxPlotCurve*) node->Data();
 286 }
 287
 288 void wxPlotWindow::SetCurrent( wxPlotCurve* current )
 289 {
 290     m_current = current;
 291     m_area->Refresh( FALSE );
 292
 293     RedrawYAxis();
 294 }
 295
 296 wxPlotCurve *wxPlotWindow::GetCurrent()
 297 {
 298     return m_current;
 299 }
 300
 301 void wxPlotWindow::Move( wxPlotCurve* curve, int pixels_up )
 302 {
 303     m_area->DeleteCurve( curve );
 304
 305     curve->SetOffsetY( curve->GetOffsetY() + pixels_up );
 306
 307     m_area->Refresh( FALSE );
 308
 309     RedrawYAxis();
 310 }
 311
 312 void wxPlotWindow::OnMoveUp( wxCommandEvent& WXUNUSED(event) )
 313 {
 314     if (!m_current) return;
 315
 316     Move( m_current, 25 );
 317 }
 318
 319 void wxPlotWindow::OnMoveDown( wxCommandEvent& WXUNUSED(event) )
 320 {
 321     if (!m_current) return;
 322
 323     Move( m_current, -25 );
 324 }
 325
 326 void wxPlotWindow::Enlarge( wxPlotCurve *curve, double factor )
 327 {
 328     m_area->DeleteCurve( curve );
 329
 330     double range = curve->GetEndY() - curve->GetStartY();
 331     double new_range = range * factor;
 332     double middle = curve->GetEndY() - range/2;
 333     curve->SetStartY( middle - new_range / 2 );
 334     curve->SetEndY( middle + new_range / 2 );
 335
 336     m_area->Refresh( FALSE );
 337
 338     RedrawYAxis();
 339 }
 340
 341 void wxPlotWindow::OnEnlarge100( wxCommandEvent& WXUNUSED(event) )
 342 {
 343     if (!m_current) return;
 344
 345     Enlarge( m_current, 2.0 );
 346 }
 347
 348 void wxPlotWindow::OnEnlarge50( wxCommandEvent& WXUNUSED(event) )
 349 {
 350     if (!m_current) return;
 351
 352     Enlarge( m_current, 1.5 );
 353 }
 354
 355 void wxPlotWindow::OnShrink50( wxCommandEvent& WXUNUSED(event) )
 356 {
 357     if (!m_current) return;
 358
 359     Enlarge( m_current, 0.5 );
 360 }
 361
 362 void wxPlotWindow::OnShrink33( wxCommandEvent& WXUNUSED(event) )
 363 {
 364     if (!m_current) return;
 365
 366     Enlarge( m_current, 0.6666666 );
 367 }
 368
 369 void wxPlotWindow::RedrawYAxis()
 370 {
 371     int client_width;
 372     int client_height;
 373     GetClientSize( &client_width, &client_height);
 374
 375     wxPoint pos( m_area->GetPosition() );
 376
 377     wxRect rect(pos.x-45,0,45,client_height);
 378     Refresh(TRUE,&rect);
 379 }
 380
 381 void wxPlotWindow::OnPaint( wxPaintEvent &WXUNUSED(event) )
 382 {
 383     wxPaintDC dc( this );
 384
 385     if (!m_current) return;
 386
 387     int client_width;
 388     int client_height;
 389     GetClientSize( &client_width, &client_height);
 390
 391     dc.SetPen( *wxBLACK_PEN );
 392
 393     wxPoint pos( m_area->GetPosition() );
 394
 395     double range = m_current->GetEndY() - m_current->GetStartY();
 396     double offset = ((double) m_current->GetOffsetY() / (double)client_height ) * range;
 397     double start = m_current->GetStartY() - offset;
 398     double end = m_current->GetEndY() - offset;
 399     int int_log_range = (int)floor( log10( range ) );
 400     double step = 1.0;
 401     if (int_log_range > 0)
 402     {
 403         for (int i = 0; i < int_log_range; i++)
 404            step *= 10;
 405     }
 406     if (int_log_range < 0)
 407     {
 408         for (int i = 0; i < -int_log_range; i++)
 409            step /= 10;
 410     }
 411     double lower = ceil(start / step) * step;
 412     double upper = floor(end / step) * step;
 413
 414     // if too few values, shrink size
 415     int steps = (int)ceil((upper-lower)/step);
 416     if (steps < 4)
 417     {
 418         step /= 2;
 419         if (lower-step > start) lower -= step;
 420         if (upper+step < end) upper += step;
 421     }
 422
 423     // if still too few, again
 424     steps = (int)ceil((upper-lower)/step);
 425     if (steps < 4)
 426     {
 427         step /= 2;
 428         if (lower-step > start) lower -= step;
 429         if (upper+step < end) upper += step;
 430     }
 431
 432     double current = lower;
 433     while (current < upper+(step/2))
 434     {
 435         int y = (int)((m_current->GetEndY()-current) / range * (double)client_height) - 1;
 436         y -= m_current->GetOffsetY();
 437         if ((y > 10) && (y < client_height-7))
 438         {
 439             dc.DrawLine( pos.x-15, y, pos.x-7, y );
 440             wxString label;
 441             label.Printf( "%.1f", current );
 442             dc.DrawText( label, pos.x-45, y-7 );
 443         }
 444
 445         current += step;
 446     }
 447
 448     dc.DrawLine( pos.x-15, 6, pos.x-15, client_height-5 );
 449     dc.DrawLine( pos.x-19, 8, pos.x-15, 2 );
 450     dc.DrawLine( pos.x-10, 9, pos.x-15, 2 );
 451
 452 }
 453