src/common/graphcmn.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/graphcmn.cpp
   3 // Purpose:     graphics context methods common to all platforms
   4 // Author:      Stefan Csomor
   5 // Modified by:
   6 // Created:
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Stefan Csomor
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #if defined(__BORLANDC__)
  16     #pragma hdrstop
  17 #endif
  18
  19 #if wxUSE_GRAPHICS_CONTEXT
  20
  21 #include "wx/graphics.h"
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/icon.h"
  25     #include "wx/bitmap.h"
  26     #include "wx/dcmemory.h"
  27     #include "wx/region.h"
  28     #include "wx/log.h"
  29 #endif
  30
  31 #if !defined(wxMAC_USE_CORE_GRAPHICS_BLEND_MODES)
  32 #define wxMAC_USE_CORE_GRAPHICS_BLEND_MODES 0
  33 #endif
  34
  35 //-----------------------------------------------------------------------------
  36 // constants
  37 //-----------------------------------------------------------------------------
  38
  39 static const double RAD2DEG = 180.0 / M_PI;
  40
  41 //-----------------------------------------------------------------------------
  42 // Local functions
  43 //-----------------------------------------------------------------------------
  44
  45 static inline double DegToRad(double deg)
  46 {
  47     return (deg * M_PI) / 180.0;
  48 }
  49
  50 //-----------------------------------------------------------------------------
  51
  52 //-----------------------------------------------------------------------------
  53 // wxGraphicsObject
  54 //-----------------------------------------------------------------------------
  55
  56 IMPLEMENT_DYNAMIC_CLASS(wxGraphicsObject, wxObject)
  57
  58 wxGraphicsObjectRefData::wxGraphicsObjectRefData( wxGraphicsRenderer* renderer )
  59 {
  60     m_renderer = renderer;
  61 }
  62 wxGraphicsObjectRefData::wxGraphicsObjectRefData( const wxGraphicsObjectRefData* data )
  63 {
  64     m_renderer = data->m_renderer;
  65 }
  66 wxGraphicsRenderer* wxGraphicsObjectRefData::GetRenderer() const
  67 {
  68     return m_renderer ;
  69 }
  70
  71 wxGraphicsObjectRefData* wxGraphicsObjectRefData::Clone() const
  72 {
  73     return new wxGraphicsObjectRefData(this);
  74 }
  75
  76 wxGraphicsObject::wxGraphicsObject()
  77 {
  78 }
  79
  80 wxGraphicsObject::wxGraphicsObject( wxGraphicsRenderer* renderer )
  81 {
  82     SetRefData( new wxGraphicsObjectRefData(renderer));
  83 }
  84
  85 wxGraphicsObject::~wxGraphicsObject()
  86 {
  87 }
  88
  89 bool wxGraphicsObject::IsNull() const
  90 {
  91     return m_refData == NULL;
  92 }
  93
  94 wxGraphicsRenderer* wxGraphicsObject::GetRenderer() const
  95 {
  96     return ( IsNull() ? NULL : GetGraphicsData()->GetRenderer() );
  97 }
  98
  99 wxGraphicsObjectRefData* wxGraphicsObject::GetGraphicsData() const
 100 {
 101     return (wxGraphicsObjectRefData*) m_refData;
 102 }
 103
 104 wxObjectRefData* wxGraphicsObject::CreateRefData() const
 105 {
 106     wxLogDebug(wxT("A Null Object cannot be changed"));
 107     return NULL;
 108 }
 109
 110 wxObjectRefData* wxGraphicsObject::CloneRefData(const wxObjectRefData* data) const
 111 {
 112     const wxGraphicsObjectRefData* ptr = (const wxGraphicsObjectRefData*) data;
 113     return ptr->Clone();
 114 }
 115
 116 //-----------------------------------------------------------------------------
 117 // pens etc.
 118 //-----------------------------------------------------------------------------
 119
 120 IMPLEMENT_DYNAMIC_CLASS(wxGraphicsPen, wxGraphicsObject)
 121 IMPLEMENT_DYNAMIC_CLASS(wxGraphicsBrush, wxGraphicsObject)
 122 IMPLEMENT_DYNAMIC_CLASS(wxGraphicsFont, wxGraphicsObject)
 123 WXDLLIMPEXP_DATA_CORE(wxGraphicsPen) wxNullGraphicsPen;
 124 WXDLLIMPEXP_DATA_CORE(wxGraphicsBrush) wxNullGraphicsBrush;
 125 WXDLLIMPEXP_DATA_CORE(wxGraphicsFont) wxNullGraphicsFont;
 126
 127 IMPLEMENT_ABSTRACT_CLASS(wxGraphicsRenderer, wxObject)
 128 IMPLEMENT_ABSTRACT_CLASS(wxGraphicsMatrix, wxGraphicsObject)
 129 IMPLEMENT_ABSTRACT_CLASS(wxGraphicsPath, wxGraphicsObject)
 130
 131 wxPoint2DDouble wxGraphicsPath::GetCurrentPoint()
 132 {
 133     wxDouble x,y;
 134     GetCurrentPoint(x,y);
 135     return wxPoint2DDouble(x,y);
 136 }
 137
 138 void wxGraphicsPath::MoveToPoint( const wxPoint2DDouble& p)
 139 {
 140     MoveToPoint( p.m_x , p.m_y);
 141 }
 142
 143 void wxGraphicsPath::AddLineToPoint( const wxPoint2DDouble& p)
 144 {
 145     AddLineToPoint( p.m_x , p.m_y);
 146 }
 147
 148 void wxGraphicsPath::AddCurveToPoint( const wxPoint2DDouble& c1, const wxPoint2DDouble& c2, const wxPoint2DDouble& e)
 149 {
 150     AddCurveToPoint(c1.m_x, c1.m_y, c2.m_x, c2.m_y, e.m_x, e.m_y);
 151 }
 152
 153 void wxGraphicsPath::AddArc( const wxPoint2DDouble& c, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise)
 154 {
 155     AddArc(c.m_x, c.m_y, r, startAngle, endAngle, clockwise);
 156 }
 157
 158 wxRect2DDouble wxGraphicsPath::GetBox()
 159 {
 160         wxDouble x,y,w,h;
 161         GetBox(&x,&y,&w,&h);
 162         return wxRect2DDouble( x,y,w,h );
 163 }
 164
 165 //
 166 // Emulations
 167 //
 168
 169 void wxGraphicsPath::AddQuadCurveToPoint( wxDouble cx, wxDouble cy, wxDouble x, wxDouble y )
 170 {
 171     // calculate using degree elevation to a cubic bezier
 172     wxPoint2DDouble c1;
 173     wxPoint2DDouble c2;
 174
 175     wxPoint2DDouble start = GetCurrentPoint();
 176     wxPoint2DDouble end(x,y);
 177     wxPoint2DDouble c(cx,cy);
 178     c1 = wxDouble(1/3.0) * start + wxDouble(2/3.0) * c;
 179     c2 = wxDouble(2/3.0) * c + wxDouble(1/3.0) * end;
 180     AddCurveToPoint(c1.m_x,c1.m_y,c2.m_x,c2.m_y,x,y);
 181 }
 182
 183 void wxGraphicsPath::AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h )
 184 {
 185     MoveToPoint(x,y);
 186     AddLineToPoint(x,y+h);
 187     AddLineToPoint(x+w,y+h);
 188     AddLineToPoint(x+w,y);
 189     CloseSubpath();
 190 }
 191
 192 void wxGraphicsPath::AddCircle( wxDouble x, wxDouble y, wxDouble r )
 193 {
 194     MoveToPoint(x+r,y);
 195     AddArc( x,y,r,0,2*M_PI,false);
 196     CloseSubpath();
 197 }
 198
 199 void wxGraphicsPath::AddEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h)
 200 {
 201     wxDouble rw = w/2;
 202     wxDouble rh = h/2;
 203     wxDouble xc = x + rw;
 204     wxDouble yc = y + rh;
 205     wxGraphicsMatrix* m = GetRenderer()->CreateMatrix();
 206     m->Translate(xc,yc);
 207     m->Scale(rw/rh,1.0);
 208     wxGraphicsPath* p = GetRenderer()->CreatePath();
 209     p->AddCircle(0,0,rh);
 210     p->Transform(m);
 211     AddPath(p);
 212     delete p;
 213     delete m;
 214 }
 215
 216 void wxGraphicsPath::AddRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius)
 217 {
 218     if ( radius == 0 )
 219         AddRectangle(x,y,w,h);
 220     else
 221     {
 222         MoveToPoint( x + w, y + h / 2);
 223         AddArcToPoint(x + w, y + h, x + w / 2, y + h, radius);
 224         AddArcToPoint(x, y + h, x, y + h / 2, radius);
 225         AddArcToPoint(x, y , x + w / 2, y, radius);
 226         AddArcToPoint(x + w, y, x + w, y + h / 2, radius);
 227         CloseSubpath();
 228     }
 229 }
 230
 231 // draws a an arc to two tangents connecting (current) to (x1,y1) and (x1,y1) to (x2,y2), also a straight line from (current) to (x1,y1)
 232 void wxGraphicsPath::AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r )
 233 {
 234     wxPoint2DDouble current = GetCurrentPoint();
 235     wxPoint2DDouble p1(x1,y1);
 236     wxPoint2DDouble p2(x2,y2);
 237
 238     wxPoint2DDouble v1 = current - p1;
 239     v1.Normalize();
 240     wxPoint2DDouble v2 = p2 - p1;
 241     v2.Normalize();
 242
 243     wxDouble alpha = v1.GetVectorAngle() - v2.GetVectorAngle();
 244
 245     if ( alpha < 0 )
 246         alpha = 360 + alpha;
 247     // TODO obtuse angles
 248
 249     alpha = DegToRad(alpha);
 250
 251     wxDouble dist = r / sin(alpha/2) * cos(alpha/2);
 252     // calculate tangential points
 253     wxPoint2DDouble t1 = dist*v1 + p1;
 254     wxPoint2DDouble t2 = dist*v2 + p1;
 255
 256     wxPoint2DDouble nv1 = v1;
 257     nv1.SetVectorAngle(v1.GetVectorAngle()-90);
 258     wxPoint2DDouble c = t1 + r*nv1;
 259
 260     wxDouble a1 = v1.GetVectorAngle()+90;
 261     wxDouble a2 = v2.GetVectorAngle()-90;
 262
 263     AddLineToPoint(t1);
 264     AddArc(c.m_x,c.m_y,r,DegToRad(a1),DegToRad(a2),true);
 265     AddLineToPoint(p2);
 266 }
 267
 268 //-----------------------------------------------------------------------------
 269 // wxGraphicsContext Convenience Methods
 270 //-----------------------------------------------------------------------------
 271
 272 IMPLEMENT_ABSTRACT_CLASS(wxGraphicsContext, wxObject)
 273
 274
 275 wxGraphicsContext::wxGraphicsContext(wxGraphicsRenderer* renderer) : wxGraphicsObject(renderer)
 276 {
 277 }
 278
 279 wxGraphicsContext::~wxGraphicsContext()
 280 {
 281 }
 282
 283 // sets the pen
 284 void wxGraphicsContext::SetPen( const wxGraphicsPen& pen )
 285 {
 286     m_pen = pen;
 287 }
 288
 289 void wxGraphicsContext::SetPen( const wxPen& pen )
 290 {
 291     if ( pen.GetStyle() == wxTRANSPARENT )
 292         SetPen( wxNullGraphicsPen );
 293     else
 294         SetPen( CreatePen( pen ) );
 295 }
 296
 297 // sets the brush for filling
 298 void wxGraphicsContext::SetBrush( const wxGraphicsBrush& brush )
 299 {
 300     m_brush = brush;
 301 }
 302
 303 void wxGraphicsContext::SetBrush( const wxBrush& brush )
 304 {
 305     if ( brush.GetStyle() == wxTRANSPARENT )
 306         SetBrush( wxNullGraphicsBrush );
 307     else
 308         SetBrush( CreateBrush( brush ) );
 309 }
 310
 311 // sets the brush for filling
 312 void wxGraphicsContext::SetFont( const wxGraphicsFont& font )
 313 {
 314     m_font = font;
 315 }
 316
 317 void wxGraphicsContext::SetFont( const wxFont& font, const wxColour& colour )
 318 {
 319     if ( font.Ok() )
 320         SetFont( CreateFont( font, colour ) );
 321     else
 322         SetFont( wxNullGraphicsFont );
 323 }
 324
 325 void wxGraphicsContext::DrawPath( const wxGraphicsPath *path, int fillStyle )
 326 {
 327     FillPath( path , fillStyle );
 328     StrokePath( path );
 329 }
 330
 331 void wxGraphicsContext::DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle )
 332 {
 333     Translate(x,y);
 334     Rotate( -angle );
 335     DrawText( str , 0, 0 );
 336     Rotate( angle );
 337     Translate(-x,-y);
 338 }
 339
 340 void wxGraphicsContext::StrokeLine( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2)
 341 {
 342     wxGraphicsPath* path = CreatePath();
 343     path->MoveToPoint(x1, y1);
 344     path->AddLineToPoint( x2, y2 );
 345     StrokePath( path );
 346     delete path;
 347 }
 348
 349 void wxGraphicsContext::DrawRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h)
 350 {
 351     wxGraphicsPath* path = CreatePath();
 352     path->AddRectangle( x , y , w , h );
 353     DrawPath( path );
 354     delete path;
 355 }
 356
 357 void wxGraphicsContext::DrawEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h)
 358 {
 359     wxGraphicsPath* path = CreatePath();
 360     path->AddEllipse(x,y,w,h);
 361     DrawPath(path);
 362     delete path;
 363 }
 364
 365 void wxGraphicsContext::DrawRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius)
 366 {
 367     wxGraphicsPath* path = CreatePath();
 368     path->AddRoundedRectangle(x,y,w,h,radius);
 369     DrawPath(path);
 370     delete path;
 371 }
 372
 373 void wxGraphicsContext::StrokeLines( size_t n, const wxPoint2DDouble *points)
 374 {
 375     wxASSERT(n > 1);
 376     wxGraphicsPath* path = CreatePath();
 377     path->MoveToPoint(points[0].m_x, points[0].m_y);
 378     for ( size_t i = 1; i < n; ++i)
 379         path->AddLineToPoint( points[i].m_x, points[i].m_y );
 380     StrokePath( path );
 381     delete path;
 382 }
 383
 384 void wxGraphicsContext::DrawLines( size_t n, const wxPoint2DDouble *points, int fillStyle)
 385 {
 386     wxASSERT(n > 1);
 387     wxGraphicsPath* path = CreatePath();
 388     path->MoveToPoint(points[0].m_x, points[0].m_y);
 389     for ( size_t i = 1; i < n; ++i)
 390         path->AddLineToPoint( points[i].m_x, points[i].m_y );
 391     DrawPath( path , fillStyle);
 392     delete path;
 393 }
 394
 395 void wxGraphicsContext::StrokeLines( size_t n, const wxPoint2DDouble *beginPoints, const wxPoint2DDouble *endPoints)
 396 {
 397     wxASSERT(n > 0);
 398     wxGraphicsPath* path = CreatePath();
 399     for ( size_t i = 0; i < n; ++i)
 400     {
 401         path->MoveToPoint(beginPoints[i].m_x, beginPoints[i].m_y);
 402         path->AddLineToPoint( endPoints[i].m_x, endPoints[i].m_y );
 403     }
 404     StrokePath( path );
 405     delete path;
 406 }
 407
 408 // create a 'native' matrix corresponding to these values
 409 wxGraphicsMatrix* wxGraphicsContext::CreateMatrix( wxDouble a, wxDouble b, wxDouble c, wxDouble d,
 410     wxDouble tx, wxDouble ty)
 411 {
 412     return GetRenderer()->CreateMatrix(a,b,c,d,tx,ty);
 413 }
 414
 415 wxGraphicsPath * wxGraphicsContext::CreatePath()
 416 {
 417     return GetRenderer()->CreatePath();
 418 }
 419
 420 wxGraphicsPen wxGraphicsContext::CreatePen(const wxPen& pen)
 421 {
 422     return GetRenderer()->CreatePen(pen);
 423 }
 424
 425 wxGraphicsBrush wxGraphicsContext::CreateBrush(const wxBrush& brush )
 426 {
 427     return GetRenderer()->CreateBrush(brush);
 428 }
 429
 430 // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
 431 wxGraphicsBrush wxGraphicsContext::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 432                                                    const wxColour&c1, const wxColour&c2)
 433 {
 434     return GetRenderer()->CreateLinearGradientBrush(x1,y1,x2,y2,c1,c2);
 435 }
 436
 437 // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
 438 // with radius r and color cColor
 439 wxGraphicsBrush wxGraphicsContext::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 440                                                    const wxColour &oColor, const wxColour &cColor)
 441 {
 442     return GetRenderer()->CreateRadialGradientBrush(xo,yo,xc,yc,radius,oColor,cColor);
 443 }
 444
 445 // sets the font
 446 wxGraphicsFont wxGraphicsContext::CreateFont( const wxFont &font , const wxColour &col )
 447 {
 448     return GetRenderer()->CreateFont(font,col);
 449 }
 450
 451 wxGraphicsContext* wxGraphicsContext::Create( const wxWindowDC& dc)
 452 {
 453     return wxGraphicsRenderer::GetDefaultRenderer()->CreateContext(dc);
 454 }
 455
 456 wxGraphicsContext* wxGraphicsContext::CreateFromNative( void * context )
 457 {
 458     return wxGraphicsRenderer::GetDefaultRenderer()->CreateContextFromNativeContext(context);
 459 }
 460
 461 wxGraphicsContext* wxGraphicsContext::CreateFromNativeWindow( void * window )
 462 {
 463     return wxGraphicsRenderer::GetDefaultRenderer()->CreateContextFromNativeWindow(window);
 464 }
 465
 466 wxGraphicsContext* wxGraphicsContext::Create( wxWindow* window )
 467 {
 468     return wxGraphicsRenderer::GetDefaultRenderer()->CreateContext(window);
 469 }
 470
 471 #endif // wxUSE_GRAPHICS_CONTEXT