KChart

KChartPolarGrid.cpp
1 /*
2  * SPDX-FileCopyrightText: 2001-2015 Klaralvdalens Datakonsult AB. All rights reserved.
3  *
4  * This file is part of the KD Chart library.
5  *
6  * SPDX-License-Identifier: GPL-2.0-or-later
7  */
8 
9 #include "KChartPolarGrid.h"
10 
11 #include "KChartPaintContext.h"
12 #include "KChartPolarDiagram.h"
13 #include "KChartPieDiagram.h"
14 #include "KChartPrintingParameters.h"
15 #include "KChartMath_p.h"
16 
17 #include <QPainter>
18 
19 using namespace KChart;
20 
21 
22 DataDimensionsList PolarGrid::calculateGrid(
23  const DataDimensionsList& rawDataDimensions ) const
24 {
25  qDebug("Calling PolarGrid::calculateGrid()");
26  Q_ASSERT_X( rawDataDimensions.count() == 2, "PolarGrid::calculateGrid",
27  "calculateGrid() expects a list with exactly two entries." );
28  Q_ASSERT_X( dynamic_cast< PolarCoordinatePlane* >( mPlane ), "PolarGrid::calculateGrid",
29  "PaintContext::calculatePlane() called, but no polar plane set." );
30 
32 
33  //FIXME(khz): do the real calculation
34 
35  l = rawDataDimensions;
36 
37  return l;
38 }
39 
40 
42 {
43 // if ( d->coordinateTransformations.size () <= 0 ) return;
44 
45  const QBrush backupBrush( context->painter()->brush() );
46  context->painter()->setBrush( QBrush() );
47  PolarCoordinatePlane* plane = dynamic_cast<PolarCoordinatePlane*>(context->coordinatePlane());
48  Q_ASSERT_X ( plane, "PolarGrid::drawGrid",
49  "Bad function call: PaintContext::coodinatePlane() NOT a polar plane." );
50 
51  const GridAttributes gridAttrsCircular( plane->gridAttributes( true ) );
52  const GridAttributes gridAttrsSagittal( plane->gridAttributes( false ) );
53 
54  //qDebug() << "OK:";
55  if ( !gridAttrsCircular.isGridVisible() && !gridAttrsSagittal.isGridVisible() ) return;
56  //qDebug() << "A";
57 
58  // FIXME: we paint the rulers to the settings of the first diagram for now:
59  AbstractPolarDiagram* dgr = dynamic_cast<AbstractPolarDiagram*> (plane->diagrams().first() );
60  Q_ASSERT ( dgr ); // only polar diagrams are allowed here
61 
62 
63  // Do not draw a grid for pie diagrams
64  if ( dynamic_cast<PieDiagram*> (plane->diagrams().first() ) ) return;
65 
66 
67  context->painter()->setPen ( PrintingParameters::scalePen( QColor ( Qt::lightGray ) ) );
68  const qreal min = dgr->dataBoundaries().first.y();
69  QPointF origin = plane->translate( QPointF( min, 0 ) ) + context->rectangle().topLeft();
70  //qDebug() << "origin" << origin;
71 
72  const qreal r = qAbs( min ) + dgr->dataBoundaries().second.y(); // use the full extents
73 
74  if ( gridAttrsSagittal.isGridVisible() ) {
75  const int numberOfSpokes = ( int ) ( 360 / plane->angleUnit() );
76  for ( int i = 0; i < numberOfSpokes ; ++i ) {
77  context->painter()->drawLine( origin, plane->translate( QPointF( r - qAbs( min ), i ) ) + context->rectangle().topLeft() );
78  }
79  }
80 
81  if ( gridAttrsCircular.isGridVisible() )
82  {
83  const qreal startPos = plane->startPosition();
84  plane->setStartPosition( 0.0 );
85  const int numberOfGridRings = ( int )dgr->numberOfGridRings();
86  for ( int j = 0; j < numberOfGridRings; ++j ) {
87  const qreal rad = min - ( ( j + 1) * r / numberOfGridRings );
88 
89  if ( rad == 0 )
90  continue;
91 
92  QRectF rect;
93  QPointF topLeftPoint;
94  QPointF bottomRightPoint;
95 
96  topLeftPoint = plane->translate( QPointF( rad, 0 ) );
97  topLeftPoint.setX( plane->translate( QPointF( rad, 90 / plane->angleUnit() ) ).x() );
98  bottomRightPoint = plane->translate( QPointF( rad, 180 / plane->angleUnit() ) );
99  bottomRightPoint.setX( plane->translate( QPointF( rad, 270 / plane->angleUnit() ) ).x() );
100 
101  rect.setTopLeft( topLeftPoint + context->rectangle().topLeft() );
102  rect.setBottomRight( bottomRightPoint + context->rectangle().topLeft() );
103 
104  context->painter()->drawEllipse( rect );
105  }
106  plane->setStartPosition( startPos );
107  }
108  context->painter()->setBrush( backupBrush );
109 }
const QPair< QPointF, QPointF > dataBoundaries() const
Return the bottom left and top right data point, that the diagram will display (unless the grid adjus...
void drawLine(const QLineF &line)
void drawGrid(PaintContext *context) override
Doing the actual drawing.
int count(const T &value) const const
qreal x() const const
Stores information about painting diagrams.
void setPen(const QColor &color)
void drawEllipse(const QRectF &rectangle)
QPointF topLeft() const const
void setBrush(const QBrush &brush)
const QPointF translate(const QPointF &diagramPoint) const override
Translate the given point in value space coordinates to a position in pixel space.
T & first()
const QBrush & brush() const const
void setTopLeft(const QPointF &position)
qreal startPosition() const
Retrieve the rotation of the coordinate plane.
A set of attributes controlling the appearance of grids.
void setX(qreal x)
const GridAttributes gridAttributes(bool circular) const
Base class for diagrams based on a polar coordinate system.
lightGray
Global namespace.
void setBottomRight(const QPointF &position)
void setStartPosition(qreal degrees)
Specify the rotation of the coordinate plane.
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