#include <qstring.h> #include <qpainter.h> #include <qwt_plot.h> #include <qwt_interval_data.h> #include <qwt_painter.h> #include <qwt_scale_map.h> #include "histogram_item.h" class HistogramItem::PrivateData { public: int attributes; QwtIntervalData data; QColor color; double reference; }; HistogramItem::HistogramItem(const QwtText &title): QwtPlotItem(title) { init(); } HistogramItem::HistogramItem(const QString &title): QwtPlotItem(QwtText(title)) { init(); } HistogramItem::~HistogramItem() { delete d_data; } void HistogramItem::init() { d_data = new PrivateData(); d_data->reference = 0.0; d_data->attributes = HistogramItem::Auto; setItemAttribute(QwtPlotItem::AutoScale, true); setItemAttribute(QwtPlotItem::Legend, true); setZ(20.0); } void HistogramItem::setBaseline(double reference) { if ( d_data->reference != reference ) { d_data->reference = reference; itemChanged(); } } double HistogramItem::baseline() const { return d_data->reference; } void HistogramItem::setData(const QwtIntervalData &data) { d_data->data = data; itemChanged(); } const QwtIntervalData &HistogramItem::data() const { return d_data->data; } void HistogramItem::setColor(const QColor &color) { if ( d_data->color != color ) { d_data->color = color; itemChanged(); } } QColor HistogramItem::color() const { return d_data->color; } QwtDoubleRect HistogramItem::boundingRect() const { QwtDoubleRect rect = d_data->data.boundingRect(); if ( !rect.isValid() ) return rect; if ( d_data->attributes & Xfy ) { rect = QwtDoubleRect( rect.y(), rect.x(), rect.height(), rect.width() ); if ( rect.left() > d_data->reference ) rect.setLeft( d_data->reference ); else if ( rect.right() < d_data->reference ) rect.setRight( d_data->reference ); } else { if ( rect.bottom() < d_data->reference ) rect.setBottom( d_data->reference ); else if ( rect.top() > d_data->reference ) rect.setTop( d_data->reference ); } return rect; } int HistogramItem::rtti() const { return QwtPlotItem::Rtti_PlotHistogram; } void HistogramItem::setHistogramAttribute(HistogramAttribute attribute, bool on) { if ( bool(d_data->attributes & attribute) == on ) return; if ( on ) d_data->attributes |= attribute; else d_data->attributes &= ~attribute; itemChanged(); } bool HistogramItem::testHistogramAttribute(HistogramAttribute attribute) const { return d_data->attributes & attribute; } void HistogramItem::draw(QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &) const { const QwtIntervalData &iData = d_data->data; painter->setPen(QPen(d_data->color)); const int x0 = xMap.transform(baseline()); const int y0 = yMap.transform(baseline()); for ( int i = 0; i < (int)iData.size(); i++ ) { if ( d_data->attributes & HistogramItem::Xfy ) { const int x2 = xMap.transform(iData.value(i)); if ( x2 == x0 ) continue; int y1 = yMap.transform( iData.interval(i).minValue()); int y2 = yMap.transform( iData.interval(i).maxValue()); if ( y1 > y2 ) qSwap(y1, y2); if ( i < (int)iData.size() - 2 ) { const int yy1 = yMap.transform(iData.interval(i+1).minValue()); const int yy2 = yMap.transform(iData.interval(i+1).maxValue()); if ( y2 == qwtMin(yy1, yy2) ) { const int xx2 = xMap.transform( iData.interval(i+1).minValue()); if ( xx2 != x0 && ( (xx2 < x0 && x2 < x0) || (xx2 > x0 && x2 > x0) ) ) { // One pixel distance between neighboured bars y2++; } } } drawBar(painter, Qt::Horizontal, QRect(x0, y1, x2 - x0, y2 - y1)); } else { const int y2 = yMap.transform(iData.value(i)); if ( y2 == y0 ) continue; int x1 = xMap.transform(iData.interval(i).minValue()); int x2 = xMap.transform(iData.interval(i).maxValue()); if ( x1 > x2 ) qSwap(x1, x2); if ( i < (int)iData.size() - 2 ) { const int xx1 = xMap.transform(iData.interval(i+1).minValue()); const int xx2 = xMap.transform(iData.interval(i+1).maxValue()); if ( x2 == qwtMin(xx1, xx2) ) { const int yy2 = yMap.transform(iData.value(i+1)); if ( yy2 != y0 && ( (yy2 < y0 && y2 < y0) || (yy2 > y0 && y2 > y0) ) ) { // One pixel distance between neighboured bars x2--; } } } drawBar(painter, Qt::Vertical, QRect(x1, y0, x2 - x1, y2 - y0) ); } } } void HistogramItem::drawBar(QPainter *painter, Qt::Orientation, const QRect& rect) const { painter->save(); const QColor color(painter->pen().color()); #if QT_VERSION >= 0x040000 const QRect r = rect.normalized(); #else const QRect r = rect.normalize(); #endif const int factor = 125; const QColor light(color.light(factor)); const QColor dark(color.dark(factor)); painter->setBrush(color); painter->setPen(Qt::NoPen); QwtPainter::drawRect(painter, r.x() + 1, r.y() + 1, r.width() - 2, r.height() - 2); painter->setBrush(Qt::NoBrush); painter->setPen(QPen(light, 2)); #if QT_VERSION >= 0x040000 QwtPainter::drawLine(painter, r.left() + 1, r.top() + 2, r.right() + 1, r.top() + 2); #else QwtPainter::drawLine(painter, r.left(), r.top() + 2, r.right() + 1, r.top() + 2); #endif painter->setPen(QPen(dark, 2)); #if QT_VERSION >= 0x040000 QwtPainter::drawLine(painter, r.left() + 1, r.bottom(), r.right() + 1, r.bottom()); #else QwtPainter::drawLine(painter, r.left(), r.bottom(), r.right() + 1, r.bottom()); #endif painter->setPen(QPen(light, 1)); #if QT_VERSION >= 0x040000 QwtPainter::drawLine(painter, r.left(), r.top() + 1, r.left(), r.bottom()); QwtPainter::drawLine(painter, r.left() + 1, r.top() + 2, r.left() + 1, r.bottom() - 1); #else QwtPainter::drawLine(painter, r.left(), r.top() + 1, r.left(), r.bottom() + 1); QwtPainter::drawLine(painter, r.left() + 1, r.top() + 2, r.left() + 1, r.bottom()); #endif painter->setPen(QPen(dark, 1)); #if QT_VERSION >= 0x040000 QwtPainter::drawLine(painter, r.right() + 1, r.top() + 1, r.right() + 1, r.bottom()); QwtPainter::drawLine(painter, r.right(), r.top() + 2, r.right(), r.bottom() - 1); #else QwtPainter::drawLine(painter, r.right() + 1, r.top() + 1, r.right() + 1, r.bottom() + 1); QwtPainter::drawLine(painter, r.right(), r.top() + 2, r.right(), r.bottom()); #endif painter->restore(); }