58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
/******************************************************************************
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* QSkinny - Copyright (C) 2021 Uwe Rathmann
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* This file may be used under the terms of the QSkinny License, Version 1.0
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*****************************************************************************/
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#include "DiagramSegmentsNode.h"
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#include <QtMath>
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DiagramSegmentsNode::DiagramSegmentsNode()
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: m_geometry( QSGGeometry::defaultAttributes_Point2D(), 0 )
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{
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m_geometry.setDrawingMode( QSGGeometry::DrawLines );
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setGeometry( &m_geometry );
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setMaterial( &m_material );
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}
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void DiagramSegmentsNode::update( const QRectF& rect, const QColor& color,
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const QVector< QVector< QPointF > >& dataPoints, int xGridLines )
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{
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Q_UNUSED( rect )
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if( color != m_color )
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{
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m_material.setColor( color );
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m_color = color;
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markDirty( QSGNode::DirtyMaterial );
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}
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if( m_rect == rect && m_dataPoints == dataPoints && m_xGridLines == xGridLines )
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{
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return;
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}
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m_rect = rect;
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m_dataPoints = dataPoints;
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m_xGridLines = xGridLines;
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const qreal step = rect.width() / ( xGridLines - 1 );
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m_geometry.allocate( m_xGridLines * 2 );
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auto vertexData = m_geometry.vertexDataAsPoint2D();
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for( int i = 0; i < m_xGridLines; ++i )
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{
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const qreal x = i * step;
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vertexData[2 * i].x = x;
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vertexData[2 * i].y = rect.height();
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vertexData[2 * i + 1].x = x;
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vertexData[2 * i + 1].y = 0;
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}
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markDirty( QSGNode::DirtyGeometry );
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}
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