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Much improved legend rendering

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This commit is contained in:
Gaute Lindkvist
2020-01-07 09:26:39 +01:00
parent 185b26514b
commit 7bd62052ca
10 changed files with 100 additions and 108 deletions
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74
ApplicationCode/UserInterface/RiuAbstractLegendFrame.cpp
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@@ -17,8 +17,13 @@
/////////////////////////////////////////////////////////////////////////////////
#include "RiuAbstractLegendFrame.h"
#include "RiaApplication.h"
#include "RiaFontCache.h"
#include "RiaPreferences.h"
#include <QPaintEvent>
#include <QPainter>
#include <QTextDocument>
#include <cmath>
@@ -76,7 +81,7 @@ QSize RiuAbstractLegendFrame::minimumSizeHint() const
QFontMetrics fontMetrics( this->font() );
QRect titleRect = fontMetrics.boundingRect( QRect( 0, 0, 200, 200 ), Qt::AlignLeft, m_title );
int preferredContentHeight = titleRect.height() + 2 * layout.lineSpacing;
int preferredContentHeight = titleRect.height() + 2.25 * layout.lineSpacing;
int preferredHeight = preferredContentHeight + layout.margins.top() + layout.margins.bottom();
int titleWidth = titleRect.width() + layout.margins.left() + layout.margins.right();
@@ -98,21 +103,37 @@ QSize RiuAbstractLegendFrame::minimumSizeHint() const
//--------------------------------------------------------------------------------------------------
void RiuAbstractLegendFrame::renderTo( QPainter* painter, const QRect& targetRect )
{
QFont font = this->font();
font.setPointSize( RiaApplication::instance()->preferences()->defaultPlotFontSize() );
this->setFont( font );
LayoutInfo layout( QSize( targetRect.width(), targetRect.height() ) );
layoutInfo( &layout );
painter->save();
painter->translate( targetRect.topLeft() );
QPoint titlePos( layout.margins.left(), layout.margins.top() );
QFontMetrics fontMetrics( this->font() );
QRect boundingRect = fontMetrics.boundingRect( targetRect, Qt::AlignLeft, m_title );
boundingRect.moveTo( titlePos );
painter->drawText( boundingRect, m_title );
painter->setFont( this->font() );
std::vector<std::pair<QPoint, QString>> visibleTickLabels = visibleLabels( layout );
QPoint titlePos( layout.margins.left(), layout.margins.top() );
{
painter->save();
QTextDocument td;
td.setDefaultFont( this->font() );
td.setHtml( m_title );
td.drawContents( painter );
painter->restore();
}
std::vector<std::pair<QRect, QString>> visibleTickLabels = visibleLabels( layout );
for ( auto tickLabel : visibleTickLabels )
{
painter->drawText( tickLabel.first, tickLabel.second );
painter->save();
painter->translate( tickLabel.first.topLeft() );
QTextDocument td;
td.setDefaultFont( this->font() );
td.setPlainText( tickLabel.second );
td.drawContents( painter );
painter->restore();
}
// Render color bar as one colored rectangle per color interval
@@ -139,43 +160,22 @@ void RiuAbstractLegendFrame::paintEvent( QPaintEvent* e )
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
std::vector<std::pair<QPoint, QString>> RiuAbstractLegendFrame::visibleLabels( const LayoutInfo& layout ) const
std::vector<std::pair<QRect, QString>> RiuAbstractLegendFrame::visibleLabels( const LayoutInfo& layout ) const
{
const int textX = layout.tickEndX + layout.tickTextLeadSpace;
std::vector<std::pair<QRect, QString>> visibleTickLabels;
const double overlapTolerance = 1.2 * layout.charHeight;
int lastVisibleTextY = 0;
std::vector<std::pair<QPoint, QString>> visibleTickLabels;
QRect lastRect;
int numLabels = labelCount();
for ( int i = 0; i < numLabels; i++ )
{
int textY = labelPixelPosY( layout, i );
QRect rect = labelRect( layout, i );
// Always draw first and last tick label. For all others, skip drawing if text ends up
// on top of the previous label.
if ( i != 0 && i != ( numLabels - 1 ) )
{
if ( std::fabs( static_cast<double>( textY - lastVisibleTextY ) ) < overlapTolerance )
{
continue;
}
// Make sure it does not overlap the last tick as well
if ( !lastRect.isEmpty() && rect.intersects( lastRect ) ) continue;
int lastTickY = layout.colorBarRect.bottom();
if ( std::fabs( static_cast<double>( lastTickY - textY ) ) < overlapTolerance )
{
continue;
}
}
QString valueString = label( numLabels - i - 1 );
QPoint pos( textX, textY );
lastVisibleTextY = textY;
visibleTickLabels.push_back( {pos, valueString} );
QString valueString = label( i );
lastRect = rect;
visibleTickLabels.push_back( {rect, valueString} );
}
return visibleTickLabels;
}