source: ntrip/trunk/BNC/qwt/qwt_plot_renderer.cpp@ 7781

Last change on this file since 7781 was 4271, checked in by mervart, 12 years ago
File size: 22.5 KB
RevLine 
[4271]1/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2 * Qwt Widget Library
3 * Copyright (C) 1997 Josef Wilgen
4 * Copyright (C) 2002 Uwe Rathmann
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the Qwt License, Version 1.0
8 *****************************************************************************/
9
10#include "qwt_plot_renderer.h"
11#include "qwt_plot.h"
12#include "qwt_painter.h"
13#include "qwt_plot_canvas.h"
14#include "qwt_plot_layout.h"
15#include "qwt_legend.h"
16#include "qwt_legend_item.h"
17#include "qwt_dyngrid_layout.h"
18#include "qwt_scale_widget.h"
19#include "qwt_scale_engine.h"
20#include "qwt_text.h"
21#include "qwt_text_label.h"
22#include "qwt_math.h"
23#include <qpainter.h>
24#include <qpaintengine.h>
25#include <qtransform.h>
26#include <qprinter.h>
27#include <qstyle.h>
28#include <qstyleoption.h>
29#include <qimagewriter.h>
30#include <qfileinfo.h>
31#ifndef QWT_NO_SVG
32#ifdef QT_SVG_LIB
33#include <qsvggenerator.h>
34#endif
35#endif
36
37class QwtPlotRenderer::PrivateData
38{
39public:
40 PrivateData():
41 discardFlags( QwtPlotRenderer::DiscardBackground ),
42 layoutFlags( QwtPlotRenderer::DefaultLayout )
43 {
44 }
45
46 QwtPlotRenderer::DiscardFlags discardFlags;
47 QwtPlotRenderer::LayoutFlags layoutFlags;
48};
49
50static void qwtRenderBackground( QPainter *painter,
51 const QRectF &rect, const QWidget *widget )
52{
53 if ( widget->testAttribute( Qt::WA_StyledBackground ) )
54 {
55 QStyleOption opt;
56 opt.initFrom( widget );
57 opt.rect = rect.toAlignedRect();
58
59 widget->style()->drawPrimitive(
60 QStyle::PE_Widget, &opt, painter, widget);
61 }
62 else
63 {
64 const QBrush brush =
65 widget->palette().brush( widget->backgroundRole() );
66
67 painter->fillRect( rect, brush );
68 }
69}
70
71/*!
72 Constructor
73 \param parent Parent object
74*/
75QwtPlotRenderer::QwtPlotRenderer( QObject *parent ):
76 QObject( parent )
77{
78 d_data = new PrivateData;
79}
80
81//! Destructor
82QwtPlotRenderer::~QwtPlotRenderer()
83{
84 delete d_data;
85}
86
87/*!
88 Change a flag, indicating what to discard from rendering
89
90 \param flag Flag to change
91 \param on On/Off
92
93 \sa DiscardFlag, testDiscardFlag(), setDiscardFlags(), discardFlags()
94*/
95void QwtPlotRenderer::setDiscardFlag( DiscardFlag flag, bool on )
96{
97 if ( on )
98 d_data->discardFlags |= flag;
99 else
100 d_data->discardFlags &= ~flag;
101}
102
103/*!
104 Check if a flag is set.
105
106 \param flag Flag to be tested
107 \sa DiscardFlag, setDiscardFlag(), setDiscardFlags(), discardFlags()
108*/
109bool QwtPlotRenderer::testDiscardFlag( DiscardFlag flag ) const
110{
111 return d_data->discardFlags & flag;
112}
113
114/*!
115 Set the flags, indicating what to discard from rendering
116
117 \param flags Flags
118 \sa DiscardFlag, setDiscardFlag(), testDiscardFlag(), discardFlags()
119*/
120void QwtPlotRenderer::setDiscardFlags( DiscardFlags flags )
121{
122 d_data->discardFlags = flags;
123}
124
125/*!
126 \return Flags, indicating what to discard from rendering
127 \sa DiscardFlag, setDiscardFlags(), setDiscardFlag(), testDiscardFlag()
128*/
129QwtPlotRenderer::DiscardFlags QwtPlotRenderer::discardFlags() const
130{
131 return d_data->discardFlags;
132}
133
134/*!
135 Change a layout flag
136
137 \param flag Flag to change
138 \param on On/Off
139
140 \sa LayoutFlag, testLayoutFlag(), setLayoutFlags(), layoutFlags()
141*/
142void QwtPlotRenderer::setLayoutFlag( LayoutFlag flag, bool on )
143{
144 if ( on )
145 d_data->layoutFlags |= flag;
146 else
147 d_data->layoutFlags &= ~flag;
148}
149
150/*!
151 Check if a flag is set.
152
153 \param flag Flag to be tested
154 \sa LayoutFlag, setLayoutFlag(), setLayoutFlags(), layoutFlags()
155*/
156bool QwtPlotRenderer::testLayoutFlag( LayoutFlag flag ) const
157{
158 return d_data->layoutFlags & flag;
159}
160
161/*!
162 Set the layout flags
163
164 \param flags Flags
165 \sa LayoutFlag, setLayoutFlag(), testLayoutFlag(), layoutFlags()
166*/
167void QwtPlotRenderer::setLayoutFlags( LayoutFlags flags )
168{
169 d_data->layoutFlags = flags;
170}
171
172/*!
173 \return Layout flags
174 \sa LayoutFlag, setLayoutFlags(), setLayoutFlag(), testLayoutFlag()
175*/
176QwtPlotRenderer::LayoutFlags QwtPlotRenderer::layoutFlags() const
177{
178 return d_data->layoutFlags;
179}
180
181/*!
182 Render a plot to a file
183
184 The format of the document will be autodetected from the
185 suffix of the filename.
186
187 \param plot Plot widget
188 \param fileName Path of the file, where the document will be stored
189 \param sizeMM Size for the document in millimeters.
190 \param resolution Resolution in dots per Inch (dpi)
191*/
192void QwtPlotRenderer::renderDocument( QwtPlot *plot,
193 const QString &fileName, const QSizeF &sizeMM, int resolution )
194{
195 renderDocument( plot, fileName,
196 QFileInfo( fileName ).suffix(), sizeMM, resolution );
197}
198
199/*!
200 Render a plot to a file
201
202 Supported formats are:
203
204 - pdf\n
205 Portable Document Format PDF
206 - ps\n
207 Postcript
208 - svg\n
209 Scalable Vector Graphics SVG
210 - all image formats supported by Qt\n
211 see QImageWriter::supportedImageFormats()
212
213 Scalable vector graphic formats like PDF or SVG are superior to
214 raster graphics formats.
215
216 \param plot Plot widget
217 \param fileName Path of the file, where the document will be stored
218 \param format Format for the document
219 \param sizeMM Size for the document in millimeters.
220 \param resolution Resolution in dots per Inch (dpi)
221
222 \sa renderTo(), render(), QwtPainter::setRoundingAlignment()
223*/
224void QwtPlotRenderer::renderDocument( QwtPlot *plot,
225 const QString &fileName, const QString &format,
226 const QSizeF &sizeMM, int resolution )
227{
228 if ( plot == NULL || sizeMM.isEmpty() || resolution <= 0 )
229 return;
230
231 QString title = plot->title().text();
232 if ( title.isEmpty() )
233 title = "Plot Document";
234
235 const double mmToInch = 1.0 / 25.4;
236 const QSizeF size = sizeMM * mmToInch * resolution;
237
238 const QRectF documentRect( 0.0, 0.0, size.width(), size.height() );
239
240 const QString fmt = format.toLower();
241 if ( fmt == "pdf" || fmt == "ps" )
242 {
243#ifndef QT_NO_PRINTER
244 QPrinter printer;
245 printer.setFullPage( true );
246 printer.setPaperSize( sizeMM, QPrinter::Millimeter );
247 printer.setDocName( title );
248 printer.setOutputFileName( fileName );
249 printer.setOutputFormat( ( format == "pdf" )
250 ? QPrinter::PdfFormat : QPrinter::PostScriptFormat );
251 printer.setResolution( resolution );
252
253 QPainter painter( &printer );
254 render( plot, &painter, documentRect );
255#endif
256 }
257 else if ( fmt == "svg" )
258 {
259#ifndef QWT_NO_SVG
260#ifdef QT_SVG_LIB
261#if QT_VERSION >= 0x040500
262 QSvgGenerator generator;
263 generator.setTitle( title );
264 generator.setFileName( fileName );
265 generator.setResolution( resolution );
266 generator.setViewBox( documentRect );
267
268 QPainter painter( &generator );
269 render( plot, &painter, documentRect );
270#endif
271#endif
272#endif
273 }
274 else
275 {
276 if ( QImageWriter::supportedImageFormats().indexOf(
277 format.toLatin1() ) >= 0 )
278 {
279 const QRect imageRect = documentRect.toRect();
280 const int dotsPerMeter = qRound( resolution * mmToInch * 1000.0 );
281
282 QImage image( imageRect.size(), QImage::Format_ARGB32 );
283 image.setDotsPerMeterX( dotsPerMeter );
284 image.setDotsPerMeterY( dotsPerMeter );
285 image.fill( QColor( Qt::white ).rgb() );
286
287 QPainter painter( &image );
288 render( plot, &painter, imageRect );
289 painter.end();
290
291 image.save( fileName, format.toLatin1() );
292 }
293 }
294}
295
296/*!
297 \brief Render the plot to a \c QPaintDevice
298
299 This function renders the contents of a QwtPlot instance to
300 \c QPaintDevice object. The target rectangle is derived from
301 its device metrics.
302
303 \param plot Plot to be rendered
304 \param paintDevice device to paint on, f.e a QImage
305
306 \sa renderDocument(), render(), QwtPainter::setRoundingAlignment()
307*/
308
309void QwtPlotRenderer::renderTo(
310 QwtPlot *plot, QPaintDevice &paintDevice ) const
311{
312 int w = paintDevice.width();
313 int h = paintDevice.height();
314
315 QPainter p( &paintDevice );
316 render( plot, &p, QRectF( 0, 0, w, h ) );
317}
318
319/*!
320 \brief Render the plot to a QPrinter
321
322 This function renders the contents of a QwtPlot instance to
323 \c QPaintDevice object. The size is derived from the printer
324 metrics.
325
326 \param plot Plot to be rendered
327 \param printer Printer to paint on
328
329 \sa renderDocument(), render(), QwtPainter::setRoundingAlignment()
330*/
331
332#ifndef QT_NO_PRINTER
333
334void QwtPlotRenderer::renderTo(
335 QwtPlot *plot, QPrinter &printer ) const
336{
337 int w = printer.width();
338 int h = printer.height();
339
340 QRectF rect( 0, 0, w, h );
341 double aspect = rect.width() / rect.height();
342 if ( ( aspect < 1.0 ) )
343 rect.setHeight( aspect * rect.width() );
344
345 QPainter p( &printer );
346 render( plot, &p, rect );
347}
348
349#endif
350
351#ifndef QWT_NO_SVG
352#ifdef QT_SVG_LIB
353#if QT_VERSION >= 0x040500
354
355/*!
356 \brief Render the plot to a QSvgGenerator
357
358 If the generator has a view box, the plot will be rendered into it.
359 If it has no viewBox but a valid size the target coordinates
360 will be (0, 0, generator.width(), generator.height()). Otherwise
361 the target rectangle will be QRectF(0, 0, 800, 600);
362
363 \param plot Plot to be rendered
364 \param generator SVG generator
365*/
366void QwtPlotRenderer::renderTo(
367 QwtPlot *plot, QSvgGenerator &generator ) const
368{
369 QRectF rect = generator.viewBoxF();
370 if ( rect.isEmpty() )
371 rect.setRect( 0, 0, generator.width(), generator.height() );
372
373 if ( rect.isEmpty() )
374 rect.setRect( 0, 0, 800, 600 ); // something
375
376 QPainter p( &generator );
377 render( plot, &p, rect );
378}
379#endif
380#endif
381#endif
382
383/*!
384 Paint the contents of a QwtPlot instance into a given rectangle.
385
386 \param plot Plot to be rendered
387 \param painter Painter
388 \param plotRect Bounding rectangle
389
390 \sa renderDocument(), renderTo(), QwtPainter::setRoundingAlignment()
391*/
392void QwtPlotRenderer::render( QwtPlot *plot,
393 QPainter *painter, const QRectF &plotRect ) const
394{
395 int axisId;
396
397 if ( painter == 0 || !painter->isActive() ||
398 !plotRect.isValid() || plot->size().isNull() )
399 return;
400
401 if ( !( d_data->discardFlags & DiscardBackground ) )
402 qwtRenderBackground( painter, plotRect, plot );
403
404 /*
405 The layout engine uses the same methods as they are used
406 by the Qt layout system. Therefore we need to calculate the
407 layout in screen coordinates and paint with a scaled painter.
408 */
409 QTransform transform;
410 transform.scale(
411 double( painter->device()->logicalDpiX() ) / plot->logicalDpiX(),
412 double( painter->device()->logicalDpiY() ) / plot->logicalDpiY() );
413
414 painter->save();
415
416 int baseLineDists[QwtPlot::axisCnt];
417 if ( d_data->layoutFlags & FrameWithScales )
418 {
419 for ( axisId = 0; axisId < QwtPlot::axisCnt; axisId++ )
420 {
421 QwtScaleWidget *scaleWidget = plot->axisWidget( axisId );
422 if ( scaleWidget )
423 {
424 baseLineDists[axisId] = scaleWidget->margin();
425 scaleWidget->setMargin( 0 );
426 }
427 }
428 }
429 // Calculate the layout for the print.
430
431 QwtPlotLayout::Options layoutOptions =
432 QwtPlotLayout::IgnoreScrollbars | QwtPlotLayout::IgnoreFrames;
433 if ( d_data->discardFlags & DiscardLegend )
434 layoutOptions |= QwtPlotLayout::IgnoreLegend;
435
436 const QRectF layoutRect = transform.inverted().mapRect( plotRect );
437 plot->plotLayout()->activate( plot, layoutRect, layoutOptions );
438
439 painter->setWorldTransform( transform, true );
440
441 // canvas
442
443 QwtScaleMap maps[QwtPlot::axisCnt];
444 buildCanvasMaps( plot, plot->plotLayout()->canvasRect(), maps );
445 renderCanvas( plot, painter, plot->plotLayout()->canvasRect(), maps );
446
447 if ( !( d_data->discardFlags & DiscardTitle )
448 && ( !plot->titleLabel()->text().isEmpty() ) )
449 {
450 renderTitle( plot, painter, plot->plotLayout()->titleRect() );
451 }
452
453 if ( !( d_data->discardFlags & DiscardLegend )
454 && plot->legend() && !plot->legend()->isEmpty() )
455 {
456 renderLegend( plot, painter, plot->plotLayout()->legendRect() );
457 }
458
459 for ( axisId = 0; axisId < QwtPlot::axisCnt; axisId++ )
460 {
461 QwtScaleWidget *scaleWidget = plot->axisWidget( axisId );
462 if ( scaleWidget )
463 {
464 int baseDist = scaleWidget->margin();
465
466 int startDist, endDist;
467 scaleWidget->getBorderDistHint( startDist, endDist );
468
469 renderScale( plot, painter, axisId, startDist, endDist,
470 baseDist, plot->plotLayout()->scaleRect( axisId ) );
471 }
472 }
473
474
475 plot->plotLayout()->invalidate();
476
477 // reset all widgets with their original attributes.
478 if ( d_data->layoutFlags & FrameWithScales )
479 {
480 // restore the previous base line dists
481
482 for ( axisId = 0; axisId < QwtPlot::axisCnt; axisId++ )
483 {
484 QwtScaleWidget *scaleWidget = plot->axisWidget( axisId );
485 if ( scaleWidget )
486 scaleWidget->setMargin( baseLineDists[axisId] );
487 }
488 }
489
490 painter->restore();
491}
492
493/*!
494 Render the title into a given rectangle.
495
496 \param plot Plot widget
497 \param painter Painter
498 \param rect Bounding rectangle
499*/
500void QwtPlotRenderer::renderTitle( const QwtPlot *plot,
501 QPainter *painter, const QRectF &rect ) const
502{
503 painter->setFont( plot->titleLabel()->font() );
504
505 const QColor color = plot->titleLabel()->palette().color(
506 QPalette::Active, QPalette::Text );
507
508 painter->setPen( color );
509 plot->titleLabel()->text().draw( painter, rect );
510}
511
512/*!
513 Render the legend into a given rectangle.
514
515 \param plot Plot widget
516 \param painter Painter
517 \param rect Bounding rectangle
518*/
519void QwtPlotRenderer::renderLegend( const QwtPlot *plot,
520 QPainter *painter, const QRectF &rect ) const
521{
522 if ( !plot->legend() || plot->legend()->isEmpty() )
523 return;
524
525 if ( !( d_data->discardFlags & DiscardBackground ) )
526 {
527 if ( plot->legend()->autoFillBackground() ||
528 plot->legend()->testAttribute( Qt::WA_StyledBackground ) )
529 {
530 qwtRenderBackground( painter, rect, plot->legend() );
531 }
532 }
533
534 const QwtDynGridLayout *legendLayout = qobject_cast<QwtDynGridLayout *>(
535 plot->legend()->contentsWidget()->layout() );
536 if ( legendLayout == NULL )
537 return;
538
539 uint numCols = legendLayout->columnsForWidth( rect.width() );
540 QList<QRect> itemRects =
541 legendLayout->layoutItems( rect.toRect(), numCols );
542
543 int index = 0;
544
545 for ( int i = 0; i < legendLayout->count(); i++ )
546 {
547 QLayoutItem *item = legendLayout->itemAt( i );
548 QWidget *w = item->widget();
549 if ( w )
550 {
551 painter->save();
552
553 painter->setClipRect( itemRects[index] );
554 renderLegendItem( plot, painter, w, itemRects[index] );
555
556 index++;
557 painter->restore();
558 }
559 }
560}
561
562/*!
563 Render the legend item into a given rectangle.
564
565 \param plot Plot widget
566 \param painter Painter
567 \param widget Widget representing a legend item
568 \param rect Bounding rectangle
569
570 \note When widget is not derived from QwtLegendItem renderLegendItem
571 does nothing and needs to be overloaded
572*/
573void QwtPlotRenderer::renderLegendItem( const QwtPlot *plot,
574 QPainter *painter, const QWidget *widget, const QRectF &rect ) const
575{
576 if ( !( d_data->discardFlags & DiscardBackground ) )
577 {
578 if ( widget->autoFillBackground() ||
579 widget->testAttribute( Qt::WA_StyledBackground ) )
580 {
581 qwtRenderBackground( painter, rect, widget );
582 }
583 }
584
585 const QwtLegendItem *item = qobject_cast<const QwtLegendItem *>( widget );
586 if ( item )
587 {
588 const QSize sz = item->identifierSize();
589
590 const QRectF identifierRect( rect.x() + item->margin(),
591 rect.center().y() - 0.5 * sz.height(), sz.width(), sz.height() );
592
593 QwtLegendItemManager *itemManger = plot->legend()->find( item );
594 if ( itemManger )
595 {
596 painter->save();
597 painter->setClipRect( identifierRect, Qt::IntersectClip );
598 itemManger->drawLegendIdentifier( painter, identifierRect );
599 painter->restore();
600 }
601
602 // Label
603
604 QRectF titleRect = rect;
605 titleRect.setX( identifierRect.right() + 2 * item->spacing() );
606
607 painter->setFont( item->font() );
608 item->text().draw( painter, titleRect );
609 }
610}
611
612/*!
613 \brief Paint a scale into a given rectangle.
614 Paint the scale into a given rectangle.
615
616 \param plot Plot widget
617 \param painter Painter
618 \param axisId Axis
619 \param startDist Start border distance
620 \param endDist End border distance
621 \param baseDist Base distance
622 \param rect Bounding rectangle
623*/
624void QwtPlotRenderer::renderScale( const QwtPlot *plot,
625 QPainter *painter,
626 int axisId, int startDist, int endDist, int baseDist,
627 const QRectF &rect ) const
628{
629 if ( !plot->axisEnabled( axisId ) )
630 return;
631
632 const QwtScaleWidget *scaleWidget = plot->axisWidget( axisId );
633 if ( scaleWidget->isColorBarEnabled()
634 && scaleWidget->colorBarWidth() > 0 )
635 {
636 scaleWidget->drawColorBar( painter, scaleWidget->colorBarRect( rect ) );
637
638 const int off = scaleWidget->colorBarWidth() + scaleWidget->spacing();
639 if ( scaleWidget->scaleDraw()->orientation() == Qt::Horizontal )
640 baseDist += off;
641 else
642 baseDist += off;
643 }
644
645 painter->save();
646
647 QwtScaleDraw::Alignment align;
648 double x, y, w;
649
650 switch ( axisId )
651 {
652 case QwtPlot::yLeft:
653 {
654 x = rect.right() - 1.0 - baseDist;
655 y = rect.y() + startDist;
656 w = rect.height() - startDist - endDist;
657 align = QwtScaleDraw::LeftScale;
658 break;
659 }
660 case QwtPlot::yRight:
661 {
662 x = rect.left() + baseDist;
663 y = rect.y() + startDist;
664 w = rect.height() - startDist - endDist;
665 align = QwtScaleDraw::RightScale;
666 break;
667 }
668 case QwtPlot::xTop:
669 {
670 x = rect.left() + startDist;
671 y = rect.bottom() - 1.0 - baseDist;
672 w = rect.width() - startDist - endDist;
673 align = QwtScaleDraw::TopScale;
674 break;
675 }
676 case QwtPlot::xBottom:
677 {
678 x = rect.left() + startDist;
679 y = rect.top() + baseDist;
680 w = rect.width() - startDist - endDist;
681 align = QwtScaleDraw::BottomScale;
682 break;
683 }
684 default:
685 return;
686 }
687
688 scaleWidget->drawTitle( painter, align, rect );
689
690 painter->setFont( scaleWidget->font() );
691
692 QwtScaleDraw *sd = const_cast<QwtScaleDraw *>( scaleWidget->scaleDraw() );
693 const QPointF sdPos = sd->pos();
694 const double sdLength = sd->length();
695
696 sd->move( x, y );
697 sd->setLength( w );
698
699 QPalette palette = scaleWidget->palette();
700 palette.setCurrentColorGroup( QPalette::Active );
701 sd->draw( painter, palette );
702
703 // reset previous values
704 sd->move( sdPos );
705 sd->setLength( sdLength );
706
707 painter->restore();
708}
709
710/*!
711 Render the canvas into a given rectangle.
712
713 \param plot Plot widget
714 \param painter Painter
715 \param map Maps mapping between plot and paint device coordinates
716 \param canvasRect Canvas rectangle
717*/
718void QwtPlotRenderer::renderCanvas( const QwtPlot *plot,
719 QPainter *painter, const QRectF &canvasRect,
720 const QwtScaleMap *map ) const
721{
722 painter->save();
723
724 QPainterPath clipPath;
725
726 QRectF r = canvasRect.adjusted( 0.0, 0.0, -1.0, -1.0 );
727
728 if ( d_data->layoutFlags & FrameWithScales )
729 {
730 r.adjust( -1.0, -1.0, 1.0, 1.0 );
731 painter->setPen( QPen( Qt::black ) );
732
733 if ( !( d_data->discardFlags & DiscardCanvasBackground ) )
734 {
735 const QBrush bgBrush =
736 plot->canvas()->palette().brush( plot->backgroundRole() );
737 painter->setBrush( bgBrush );
738 }
739
740 QwtPainter::drawRect( painter, r );
741 }
742 else
743 {
744 if ( !( d_data->discardFlags & DiscardCanvasBackground ) )
745 {
746 qwtRenderBackground( painter, r, plot->canvas() );
747
748 if ( plot->canvas()->testAttribute( Qt::WA_StyledBackground ) )
749 {
750 // The clip region is calculated in integers
751 // To avoid too much rounding errors better
752 // calculate it in target device resolution
753 // TODO ...
754
755 int x1 = qCeil( canvasRect.left() );
756 int x2 = qFloor( canvasRect.right() );
757 int y1 = qCeil( canvasRect.top() );
758 int y2 = qFloor( canvasRect.bottom() );
759
760 clipPath = plot->canvas()->borderPath(
761 QRect( x1, y1, x2 - x1 - 1, y2 - y1 - 1 ) );
762 }
763 }
764 }
765
766 painter->restore();
767
768 painter->save();
769
770 if ( clipPath.isEmpty() )
771 painter->setClipRect( canvasRect );
772 else
773 painter->setClipPath( clipPath );
774
775 plot->drawItems( painter, canvasRect, map );
776
777 painter->restore();
778}
779
780/*!
781 Calculated the scale maps for rendering the canvas
782
783 \param plot Plot widget
784 \param canvasRect Target rectangle
785 \param maps Scale maps to be calculated
786*/
787void QwtPlotRenderer::buildCanvasMaps( const QwtPlot *plot,
788 const QRectF &canvasRect, QwtScaleMap maps[] ) const
789{
790 for ( int axisId = 0; axisId < QwtPlot::axisCnt; axisId++ )
791 {
792 maps[axisId].setTransformation(
793 plot->axisScaleEngine( axisId )->transformation() );
794
795 const QwtScaleDiv &scaleDiv = *plot->axisScaleDiv( axisId );
796 maps[axisId].setScaleInterval(
797 scaleDiv.lowerBound(), scaleDiv.upperBound() );
798
799 double from, to;
800 if ( plot->axisEnabled( axisId ) )
801 {
802 const int sDist = plot->axisWidget( axisId )->startBorderDist();
803 const int eDist = plot->axisWidget( axisId )->endBorderDist();
804 const QRectF &scaleRect = plot->plotLayout()->scaleRect( axisId );
805
806 if ( axisId == QwtPlot::xTop || axisId == QwtPlot::xBottom )
807 {
808 from = scaleRect.left() + sDist;
809 to = scaleRect.right() - eDist;
810 }
811 else
812 {
813 from = scaleRect.bottom() - eDist;
814 to = scaleRect.top() + sDist;
815 }
816 }
817 else
818 {
819 int margin = plot->plotLayout()->canvasMargin( axisId );
820 if ( axisId == QwtPlot::yLeft || axisId == QwtPlot::yRight )
821 {
822 from = canvasRect.bottom() - margin;
823 to = canvasRect.top() + margin;
824 }
825 else
826 {
827 from = canvasRect.left() + margin;
828 to = canvasRect.right() - margin;
829 }
830 }
831 maps[axisId].setPaintInterval( from, to );
832 }
833}
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