/
qgshollowscalebarrenderer.cpp
183 lines (153 loc) · 7.28 KB
/
qgshollowscalebarrenderer.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/***************************************************************************
qgshollowscalebarrenderer.cpp
--------------------------------
begin : March 2020
copyright : (C) 2020 by Nyall Dawson
email : nyall dot dawson at gmail dot com
***************************************************************************/
/***************************************************************************
* *
* 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 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgshollowscalebarrenderer.h"
#include "qgsscalebarsettings.h"
#include "qgslayoututils.h"
#include "qgssymbol.h"
#include "qgsfillsymbollayer.h"
#include <QList>
#include <QPainter>
QString QgsHollowScaleBarRenderer::id() const
{
return QStringLiteral( "hollow" );
}
QString QgsHollowScaleBarRenderer::visibleName() const
{
return QObject::tr( "Hollow" );
}
int QgsHollowScaleBarRenderer::sortKey() const
{
return 8;
}
QgsHollowScaleBarRenderer *QgsHollowScaleBarRenderer::clone() const
{
return new QgsHollowScaleBarRenderer( *this );
}
void QgsHollowScaleBarRenderer::draw( QgsRenderContext &context, const QgsScaleBarSettings &settings, const ScaleBarContext &scaleContext ) const
{
if ( !context.painter() )
{
return;
}
QPainter *painter = context.painter();
const double scaledLabelBarSpace = context.convertToPainterUnits( settings.labelBarSpace(), QgsUnitTypes::RenderMillimeters );
const double scaledBoxContentSpace = context.convertToPainterUnits( settings.boxContentSpace(), QgsUnitTypes::RenderMillimeters );
const QFontMetricsF fontMetrics = QgsTextRenderer::fontMetrics( context, settings.textFormat() );
const double barTopPosition = scaledBoxContentSpace + ( settings.labelVerticalPlacement() == QgsScaleBarSettings::LabelAboveSegment ? fontMetrics.ascent() + scaledLabelBarSpace : 0 );
const double barHeight = context.convertToPainterUnits( settings.height(), QgsUnitTypes::RenderMillimeters );
painter->save();
if ( context.flags() & QgsRenderContext::Antialiasing )
painter->setRenderHint( QPainter::Antialiasing, true );
std::unique_ptr< QgsLineSymbol > lineSymbol( settings.lineSymbol()->clone() );
lineSymbol->startRender( context );
std::unique_ptr< QgsFillSymbol > fillSymbol1( settings.fillSymbol1()->clone() );
fillSymbol1->startRender( context );
std::unique_ptr< QgsFillSymbol > fillSymbol2( settings.fillSymbol2()->clone() );
fillSymbol2->startRender( context );
painter->setPen( Qt::NoPen );
painter->setBrush( Qt::NoBrush );
bool useColor = true; //alternate brush color/white
const double xOffset = firstLabelXOffset( settings, context, scaleContext );
const QList<double> positions = segmentPositions( context, scaleContext, settings );
const QList<double> widths = segmentWidths( scaleContext, settings );
// draw the fill
double minX = 0;
double maxX = 0;
QgsFillSymbol *currentSymbol = nullptr;
for ( int i = 0; i < positions.size(); ++i )
{
if ( useColor ) //alternating colors
{
currentSymbol = fillSymbol1.get();
}
else //secondary fill
{
currentSymbol = fillSymbol2.get();
}
const double thisX = context.convertToPainterUnits( positions.at( i ), QgsUnitTypes::RenderMillimeters ) + xOffset;
const double thisWidth = context.convertToPainterUnits( widths.at( i ), QgsUnitTypes::RenderMillimeters );
if ( i == 0 )
minX = thisX;
if ( i == positions.size() - 1 )
maxX = thisX + thisWidth;
QRectF segmentRect( thisX, barTopPosition, thisWidth, barHeight );
currentSymbol->renderPolygon( QPolygonF()
<< segmentRect.topLeft()
<< segmentRect.topRight()
<< segmentRect.bottomRight()
<< segmentRect.bottomLeft()
<< segmentRect.topLeft(), nullptr, nullptr, context );
useColor = !useColor;
}
// and then the lines
// note that we do this layer-by-layer, to avoid ugliness where the lines touch the outer rect
for ( int layer = 0; layer < lineSymbol->symbolLayerCount(); ++layer )
{
// horizontal lines
bool drawLine = false;
for ( int i = 0; i < positions.size(); ++i )
{
drawLine = !drawLine;
if ( !drawLine )
continue;
const double lineX = context.convertToPainterUnits( positions.at( i ), QgsUnitTypes::RenderMillimeters ) + xOffset;
const double lineLength = context.convertToPainterUnits( widths.at( i ), QgsUnitTypes::RenderMillimeters );
lineSymbol->renderPolyline( QPolygonF()
<< QPointF( lineX, barTopPosition + barHeight / 2.0 )
<< QPointF( lineX + lineLength, barTopPosition + barHeight / 2.0 ),
nullptr, context, layer );
}
// vertical lines
for ( int i = 1; i < positions.size(); ++i )
{
const double lineX = context.convertToPainterUnits( positions.at( i ), QgsUnitTypes::RenderMillimeters ) + xOffset;
lineSymbol->renderPolyline( QPolygonF()
<< QPointF( lineX, barTopPosition )
<< QPointF( lineX, barTopPosition + barHeight ),
nullptr, context, layer );
}
// outside line
lineSymbol->renderPolyline( QPolygonF()
<< QPointF( minX, barTopPosition )
<< QPointF( maxX, barTopPosition )
<< QPointF( maxX, barTopPosition + barHeight )
<< QPointF( minX, barTopPosition + barHeight )
<< QPointF( minX, barTopPosition ),
nullptr, context, layer );
}
lineSymbol->stopRender( context );
fillSymbol1->stopRender( context );
fillSymbol2->stopRender( context );
painter->restore();
//draw labels using the default method
drawDefaultLabels( context, settings, scaleContext );
}
bool QgsHollowScaleBarRenderer::applyDefaultSettings( QgsScaleBarSettings &settings ) const
{
// null the fill symbols by default
std::unique_ptr< QgsFillSymbol > fillSymbol = qgis::make_unique< QgsFillSymbol >();
std::unique_ptr< QgsSimpleFillSymbolLayer > fillSymbolLayer = qgis::make_unique< QgsSimpleFillSymbolLayer >();
fillSymbolLayer->setColor( QColor( 0, 0, 0 ) );
fillSymbolLayer->setBrushStyle( Qt::NoBrush );
fillSymbolLayer->setStrokeStyle( Qt::NoPen );
fillSymbol->changeSymbolLayer( 0, fillSymbolLayer->clone() );
settings.setFillSymbol1( fillSymbol.release() );
fillSymbol = qgis::make_unique< QgsFillSymbol >();
fillSymbolLayer->setColor( QColor( 255, 255, 255 ) );
fillSymbol->changeSymbolLayer( 0, fillSymbolLayer.release() );
settings.setFillSymbol2( fillSymbol.release() );
return true;
}