File indexing completed on 2024-04-28 03:56:43

 /*  -*- C++ -*-
     This file is part of the KDE libraries
     SPDX-FileCopyrightText: 2003 Jason Harris <kstars@30doradus.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "kplotwidget.h"
 
 #include <math.h>
 
 #include <QHash>
 #include <QHelpEvent>
 #include <QPainter>
 #include <QToolTip>
 #include <QtAlgorithms>
 
 #include "kplotaxis.h"
 #include "kplotobject.h"
 #include "kplotpoint.h"
 
 #define XPADDING 20
 #define YPADDING 20
 #define BIGTICKSIZE 10
 #define SMALLTICKSIZE 4
 #define TICKOFFSET 0
 
 class Q_DECL_HIDDEN KPlotWidget::Private
 {
 public:
     Private(KPlotWidget *qq)
         : q(qq)
         , cBackground(Qt::black)
         , cForeground(Qt::white)
         , cGrid(Qt::gray)
         , showGrid(false)
         , showObjectToolTip(true)
         , useAntialias(false)
         , autoDelete(true)
     {
         // create the axes and setting their default properties
         KPlotAxis *leftAxis = new KPlotAxis();
         leftAxis->setTickLabelsShown(true);
         axes.insert(LeftAxis, leftAxis);
         KPlotAxis *bottomAxis = new KPlotAxis();
         bottomAxis->setTickLabelsShown(true);
         axes.insert(BottomAxis, bottomAxis);
         KPlotAxis *rightAxis = new KPlotAxis();
         axes.insert(RightAxis, rightAxis);
         KPlotAxis *topAxis = new KPlotAxis();
         axes.insert(TopAxis, topAxis);
     }
 
     ~Private()
     {
         if (autoDelete) {
             qDeleteAll(objectList);
         }
         qDeleteAll(axes);
     }
 
     KPlotWidget *q;
 
     void calcDataRectLimits(double x1, double x2, double y1, double y2);
     /**
      * @return a value indicating how well the given rectangle is
      * avoiding masked regions in the plot.  A higher returned value
      * indicates that the rectangle is intersecting a larger portion
      * of the masked region, or a portion of the masked region which
      * is weighted higher.
      * @param r The rectangle to be tested
      */
     float rectCost(const QRectF &r) const;
 
     // Colors
     QColor cBackground, cForeground, cGrid;
     // draw options
     bool showGrid;
     bool showObjectToolTip;
     bool useAntialias;
     bool autoDelete;
     // padding
     int leftPadding, rightPadding, topPadding, bottomPadding;
     // hashmap with the axes we have
     QHash<Axis, KPlotAxis *> axes;
     // List of KPlotObjects
     QList<KPlotObject *> objectList;
     // Limits of the plot area in data units
     QRectF dataRect, secondDataRect;
     // Limits of the plot area in pixel units
     QRect pixRect;
     // Array holding the mask of "used" regions of the plot
     QImage plotMask;
 };
 
 KPlotWidget::KPlotWidget(QWidget *parent)
     : QFrame(parent)
     , d(new Private(this))
 {
     setAttribute(Qt::WA_OpaquePaintEvent);
     setAttribute(Qt::WA_NoSystemBackground);
 
     d->secondDataRect = QRectF(); // default: no secondary data rect
     // sets the default limits
     d->calcDataRectLimits(0.0, 1.0, 0.0, 1.0);
 
     setDefaultPaddings();
 }
 
 KPlotWidget::~KPlotWidget() = default;
 
 QSize KPlotWidget::minimumSizeHint() const
 {
     return QSize(150, 150);
 }
 
 QSize KPlotWidget::sizeHint() const
 {
     return size();
 }
 
 void KPlotWidget::setLimits(double x1, double x2, double y1, double y2)
 {
     d->calcDataRectLimits(x1, x2, y1, y2);
     update();
 }
 
 void KPlotWidget::Private::calcDataRectLimits(double x1, double x2, double y1, double y2)
 {
     double XA1;
     double XA2;
     double YA1;
     double YA2;
     if (x2 < x1) {
         XA1 = x2;
         XA2 = x1;
     } else {
         XA1 = x1;
         XA2 = x2;
     }
     if (y2 < y1) {
         YA1 = y2;
         YA2 = y1;
     } else {
         YA1 = y1;
         YA2 = y2;
     }
 
     if (XA2 == XA1) {
         // qWarning() << "x1 and x2 cannot be equal. Setting x2 = x1 + 1.0";
         XA2 = XA1 + 1.0;
     }
     if (YA2 == YA1) {
         // qWarning() << "y1 and y2 cannot be equal. Setting y2 = y1 + 1.0";
         YA2 = YA1 + 1.0;
     }
     dataRect = QRectF(XA1, YA1, XA2 - XA1, YA2 - YA1);
 
     q->axis(LeftAxis)->setTickMarks(dataRect.y(), dataRect.height());
     q->axis(BottomAxis)->setTickMarks(dataRect.x(), dataRect.width());
 
     if (secondDataRect.isNull()) {
         q->axis(RightAxis)->setTickMarks(dataRect.y(), dataRect.height());
         q->axis(TopAxis)->setTickMarks(dataRect.x(), dataRect.width());
     }
 }
 
 void KPlotWidget::setSecondaryLimits(double x1, double x2, double y1, double y2)
 {
     double XA1;
     double XA2;
     double YA1;
     double YA2;
     if (x2 < x1) {
         XA1 = x2;
         XA2 = x1;
     } else {
         XA1 = x1;
         XA2 = x2;
     }
     if (y2 < y1) {
         YA1 = y2;
         YA2 = y1;
     } else {
         YA1 = y1;
         YA2 = y2;
     }
 
     if (XA2 == XA1) {
         // qWarning() << "x1 and x2 cannot be equal. Setting x2 = x1 + 1.0";
         XA2 = XA1 + 1.0;
     }
     if (YA2 == YA1) {
         // qWarning() << "y1 and y2 cannot be equal. Setting y2 = y1 + 1.0";
         YA2 = YA1 + 1.0;
     }
     d->secondDataRect = QRectF(XA1, YA1, XA2 - XA1, YA2 - YA1);
 
     axis(RightAxis)->setTickMarks(d->secondDataRect.y(), d->secondDataRect.height());
     axis(TopAxis)->setTickMarks(d->secondDataRect.x(), d->secondDataRect.width());
 
     update();
 }
 
 void KPlotWidget::clearSecondaryLimits()
 {
     d->secondDataRect = QRectF();
     axis(RightAxis)->setTickMarks(d->dataRect.y(), d->dataRect.height());
     axis(TopAxis)->setTickMarks(d->dataRect.x(), d->dataRect.width());
 
     update();
 }
 
 QRectF KPlotWidget::dataRect() const
 {
     return d->dataRect;
 }
 
 QRectF KPlotWidget::secondaryDataRect() const
 {
     return d->secondDataRect;
 }
 
 void KPlotWidget::addPlotObject(KPlotObject *object)
 {
     // skip null pointers
     if (!object) {
         return;
     }
     d->objectList.append(object);
     update();
 }
 
 void KPlotWidget::addPlotObjects(const QList<KPlotObject *> &objects)
 {
     bool addedsome = false;
     for (KPlotObject *o : objects) {
         if (!o) {
             continue;
         }
 
         d->objectList.append(o);
         addedsome = true;
     }
     if (addedsome) {
         update();
     }
 }
 
 QList<KPlotObject *> KPlotWidget::plotObjects() const
 {
     return d->objectList;
 }
 
 void KPlotWidget::setAutoDeletePlotObjects(bool autoDelete)
 {
     d->autoDelete = autoDelete;
 }
 
 void KPlotWidget::removeAllPlotObjects()
 {
     if (d->objectList.isEmpty()) {
         return;
     }
 
     if (d->autoDelete) {
         qDeleteAll(d->objectList);
     }
     d->objectList.clear();
     update();
 }
 
 void KPlotWidget::resetPlotMask()
 {
     d->plotMask = QImage(pixRect().size(), QImage::Format_ARGB32);
     QColor fillColor = Qt::black;
     fillColor.setAlpha(128);
     d->plotMask.fill(fillColor.rgb());
 }
 
 void KPlotWidget::resetPlot()
 {
     if (d->autoDelete) {
         qDeleteAll(d->objectList);
     }
     d->objectList.clear();
     clearSecondaryLimits();
     d->calcDataRectLimits(0.0, 1.0, 0.0, 1.0);
     KPlotAxis *a = axis(RightAxis);
     a->setLabel(QString());
     a->setTickLabelsShown(false);
     a = axis(TopAxis);
     a->setLabel(QString());
     a->setTickLabelsShown(false);
     axis(KPlotWidget::LeftAxis)->setLabel(QString());
     axis(KPlotWidget::BottomAxis)->setLabel(QString());
     resetPlotMask();
 }
 
 void KPlotWidget::replacePlotObject(int i, KPlotObject *o)
 {
     // skip null pointers and invalid indexes
     if (!o || i < 0 || i >= d->objectList.count()) {
         return;
     }
     if (d->objectList.at(i) == o) {
         return;
     }
     if (d->autoDelete) {
         delete d->objectList.at(i);
     }
     d->objectList.replace(i, o);
     update();
 }
 
 QColor KPlotWidget::backgroundColor() const
 {
     return d->cBackground;
 }
 
 QColor KPlotWidget::foregroundColor() const
 {
     return d->cForeground;
 }
 
 QColor KPlotWidget::gridColor() const
 {
     return d->cGrid;
 }
 
 void KPlotWidget::setBackgroundColor(const QColor &bg)
 {
     d->cBackground = bg;
     update();
 }
 
 void KPlotWidget::setForegroundColor(const QColor &fg)
 {
     d->cForeground = fg;
     update();
 }
 
 void KPlotWidget::setGridColor(const QColor &gc)
 {
     d->cGrid = gc;
     update();
 }
 
 bool KPlotWidget::isGridShown() const
 {
     return d->showGrid;
 }
 
 bool KPlotWidget::isObjectToolTipShown() const
 {
     return d->showObjectToolTip;
 }
 
 bool KPlotWidget::antialiasing() const
 {
     return d->useAntialias;
 }
 
 void KPlotWidget::setAntialiasing(bool b)
 {
     d->useAntialias = b;
     update();
 }
 
 void KPlotWidget::setShowGrid(bool show)
 {
     d->showGrid = show;
     update();
 }
 
 void KPlotWidget::setObjectToolTipShown(bool show)
 {
     d->showObjectToolTip = show;
 }
 
 KPlotAxis *KPlotWidget::axis(Axis type)
 {
     QHash<Axis, KPlotAxis *>::Iterator it = d->axes.find(type);
     return it != d->axes.end() ? it.value() : nullptr;
 }
 
 const KPlotAxis *KPlotWidget::axis(Axis type) const
 {
     QHash<Axis, KPlotAxis *>::ConstIterator it = d->axes.constFind(type);
     return it != d->axes.constEnd() ? it.value() : nullptr;
 }
 
 QRect KPlotWidget::pixRect() const
 {
     return d->pixRect;
 }
 
 QList<KPlotPoint *> KPlotWidget::pointsUnderPoint(const QPoint &p) const
 {
     QList<KPlotPoint *> pts;
     for (const KPlotObject *po : std::as_const(d->objectList)) {
         const auto pointsList = po->points();
         for (KPlotPoint *pp : pointsList) {
             if ((p - mapToWidget(pp->position()).toPoint()).manhattanLength() <= 4) {
                 pts << pp;
             }
         }
     }
 
     return pts;
 }
 
 bool KPlotWidget::event(QEvent *e)
 {
     if (e->type() == QEvent::ToolTip) {
         if (d->showObjectToolTip) {
             QHelpEvent *he = static_cast<QHelpEvent *>(e);
             QList<KPlotPoint *> pts = pointsUnderPoint(he->pos() - QPoint(leftPadding(), topPadding()) - contentsRect().topLeft());
             if (!pts.isEmpty()) {
                 QToolTip::showText(he->globalPos(), pts.front()->label(), this);
             }
         }
         e->accept();
         return true;
     } else {
         return QFrame::event(e);
     }
 }
 
 void KPlotWidget::resizeEvent(QResizeEvent *e)
 {
     QFrame::resizeEvent(e);
     setPixRect();
     resetPlotMask();
 }
 
 void KPlotWidget::setPixRect()
 {
     int newWidth = contentsRect().width() - leftPadding() - rightPadding();
     int newHeight = contentsRect().height() - topPadding() - bottomPadding();
     // PixRect starts at (0,0) because we will translate by leftPadding(), topPadding()
     d->pixRect = QRect(0, 0, newWidth, newHeight);
 }
 
 QPointF KPlotWidget::mapToWidget(const QPointF &p) const
 {
     float px = d->pixRect.left() + d->pixRect.width() * (p.x() - d->dataRect.x()) / d->dataRect.width();
     float py = d->pixRect.top() + d->pixRect.height() * (d->dataRect.y() + d->dataRect.height() - p.y()) / d->dataRect.height();
     return QPointF(px, py);
 }
 
 void KPlotWidget::maskRect(const QRectF &rf, float fvalue)
 {
     QRect r = rf.toRect().intersected(d->pixRect);
     int value = int(fvalue);
     QColor newColor;
     for (int ix = r.left(); ix < r.right(); ++ix) {
         for (int iy = r.top(); iy < r.bottom(); ++iy) {
             newColor = QColor(d->plotMask.pixel(ix, iy));
             newColor.setAlpha(200);
             newColor.setRed(qMin(newColor.red() + value, 255));
             d->plotMask.setPixel(ix, iy, newColor.rgba());
         }
     }
 }
 
 void KPlotWidget::maskAlongLine(const QPointF &p1, const QPointF &p2, float fvalue)
 {
     if (!d->pixRect.contains(p1.toPoint()) && !d->pixRect.contains(p2.toPoint())) {
         return;
     }
 
     int value = int(fvalue);
 
     // Determine slope and zeropoint of line
     double m = (p2.y() - p1.y()) / (p2.x() - p1.x());
     double y0 = p1.y() - m * p1.x();
     QColor newColor;
 
     // Mask each pixel along the line joining p1 and p2
     if (m > 1.0 || m < -1.0) { // step in y-direction
         int y1 = int(p1.y());
         int y2 = int(p2.y());
         if (y1 > y2) {
             y1 = int(p2.y());
             y2 = int(p1.y());
         }
 
         for (int y = y1; y <= y2; ++y) {
             int x = int((y - y0) / m);
             if (d->pixRect.contains(x, y)) {
                 newColor = QColor(d->plotMask.pixel(x, y));
                 newColor.setAlpha(100);
                 newColor.setRed(qMin(newColor.red() + value, 255));
                 d->plotMask.setPixel(x, y, newColor.rgba());
             }
         }
 
     } else { // step in x-direction
         int x1 = int(p1.x());
         int x2 = int(p2.x());
         if (x1 > x2) {
             x1 = int(p2.x());
             x2 = int(p1.x());
         }
 
         for (int x = x1; x <= x2; ++x) {
             int y = int(y0 + m * x);
             if (d->pixRect.contains(x, y)) {
                 newColor = QColor(d->plotMask.pixel(x, y));
                 newColor.setAlpha(100);
                 newColor.setRed(qMin(newColor.red() + value, 255));
                 d->plotMask.setPixel(x, y, newColor.rgba());
             }
         }
     }
 }
 
 // Determine optimal placement for a text label for point pp.  We want
 // the label to be near point pp, but we don't want it to overlap with
 // other labels or plot elements.  We will use a "downhill simplex"
 // algorithm to find a label position that minimizes the pixel values
 // in the plotMask image over the label's rect().  The sum of pixel
 // values in the label's rect is the "cost" of placing the label there.
 //
 // Because a downhill simplex follows the local gradient to find low
 // values, it can get stuck in local minima.  To mitigate this, we will
 // iteratively attempt each of the initial path offset directions (up,
 // down, right, left) in the order of increasing cost at each location.
 void KPlotWidget::placeLabel(QPainter *painter, KPlotPoint *pp)
 {
     int textFlags = Qt::TextSingleLine | Qt::AlignCenter;
 
     QPointF pos = mapToWidget(pp->position());
     if (!d->pixRect.contains(pos.toPoint())) {
         return;
     }
 
     QFontMetricsF fm(painter->font(), painter->device());
     QRectF bestRect = fm.boundingRect(QRectF(pos.x(), pos.y(), 1, 1), textFlags, pp->label());
     float xStep = 0.5 * bestRect.width();
     float yStep = 0.5 * bestRect.height();
     float maxCost = 0.05 * bestRect.width() * bestRect.height();
     float bestCost = d->rectCost(bestRect);
 
     // We will travel along a path defined by the maximum decrease in
     // the cost at each step.  If this path takes us to a local minimum
     // whose cost exceeds maxCost, then we will restart at the
     // beginning and select the next-best path.  The indices of
     // already-tried paths are stored in the TriedPathIndex list.
     //
     // If we try all four first-step paths and still don't get below
     // maxCost, then we'll adopt the local minimum position with the
     // best cost (designated as bestBadCost).
     int iter = 0;
     QList<int> TriedPathIndex;
     float bestBadCost = 10000;
     QRectF bestBadRect;
 
     // needed to halt iteration from inside the switch
     bool flagStop = false;
 
     while (bestCost > maxCost) {
         // Displace the label up, down, left, right; determine which
         // step provides the lowest cost
         QRectF upRect = bestRect;
         upRect.moveTop(upRect.top() + yStep);
         float upCost = d->rectCost(upRect);
         QRectF downRect = bestRect;
         downRect.moveTop(downRect.top() - yStep);
         float downCost = d->rectCost(downRect);
         QRectF leftRect = bestRect;
         leftRect.moveLeft(leftRect.left() - xStep);
         float leftCost = d->rectCost(leftRect);
         QRectF rightRect = bestRect;
         rightRect.moveLeft(rightRect.left() + xStep);
         float rightCost = d->rectCost(rightRect);
 
         // which direction leads to the lowest cost?
         QList<float> costList;
         costList << upCost << downCost << leftCost << rightCost;
         int imin = -1;
         for (int i = 0; i < costList.size(); ++i) {
             if (iter == 0 && TriedPathIndex.contains(i)) {
                 continue; // Skip this first-step path, we already tried it!
             }
 
             // If this first-step path doesn't improve the cost,
             // skip this direction from now on
             if (iter == 0 && costList[i] >= bestCost) {
                 TriedPathIndex.append(i);
                 continue;
             }
 
             if (costList[i] < bestCost && (imin < 0 || costList[i] < costList[imin])) {
                 imin = i;
             }
         }
 
         // Make a note that we've tried the current first-step path
         if (iter == 0 && imin >= 0) {
             TriedPathIndex.append(imin);
         }
 
         // Adopt the step that produced the best cost
         switch (imin) {
         case 0: // up
             bestRect.moveTop(upRect.top());
             bestCost = upCost;
             break;
         case 1: // down
             bestRect.moveTop(downRect.top());
             bestCost = downCost;
             break;
         case 2: // left
             bestRect.moveLeft(leftRect.left());
             bestCost = leftCost;
             break;
         case 3: // right
             bestRect.moveLeft(rightRect.left());
             bestCost = rightCost;
             break;
         case -1: // no lower cost found!
             // We hit a local minimum.  Keep the best of these as bestBadRect
             if (bestCost < bestBadCost) {
                 bestBadCost = bestCost;
                 bestBadRect = bestRect;
             }
 
             // If all of the first-step paths have now been searched, we'll
             // have to adopt the bestBadRect
             if (TriedPathIndex.size() == 4) {
                 bestRect = bestBadRect;
                 flagStop = true; // halt iteration
                 break;
             }
 
             // If we haven't yet tried all of the first-step paths, start over
             if (TriedPathIndex.size() < 4) {
                 iter = -1; // anticipating the ++iter below
                 bestRect = fm.boundingRect(QRectF(pos.x(), pos.y(), 1, 1), textFlags, pp->label());
                 bestCost = d->rectCost(bestRect);
             }
             break;
         }
 
         // Halt iteration, because we've tried all directions and
         // haven't gotten below maxCost (we'll adopt the best
         // local minimum found)
         if (flagStop) {
             break;
         }
 
         ++iter;
     }
 
     painter->drawText(bestRect, textFlags, pp->label());
 
     // Is a line needed to connect the label to the point?
     float deltax = pos.x() - bestRect.center().x();
     float deltay = pos.y() - bestRect.center().y();
     float rbest = sqrt(deltax * deltax + deltay * deltay);
     if (rbest > 20.0) {
         // Draw a rectangle around the label
         painter->setBrush(QBrush());
         // QPen pen = painter->pen();
         // pen.setStyle( Qt::DotLine );
         // painter->setPen( pen );
         painter->drawRoundedRect(bestRect, 25, 25, Qt::RelativeSize);
 
         // Now connect the label to the point with a line.
         // The line is drawn from the center of the near edge of the rectangle
         float xline = bestRect.center().x();
         if (bestRect.left() > pos.x()) {
             xline = bestRect.left();
         }
         if (bestRect.right() < pos.x()) {
             xline = bestRect.right();
         }
 
         float yline = bestRect.center().y();
         if (bestRect.top() > pos.y()) {
             yline = bestRect.top();
         }
         if (bestRect.bottom() < pos.y()) {
             yline = bestRect.bottom();
         }
 
         painter->drawLine(QPointF(xline, yline), pos);
     }
 
     // Mask the label's rectangle so other labels won't overlap it.
     maskRect(bestRect);
 }
 
 float KPlotWidget::Private::rectCost(const QRectF &r) const
 {
     if (!plotMask.rect().contains(r.toRect())) {
         return 10000.;
     }
 
     // Compute sum of mask values in the rect r
     QImage subMask = plotMask.copy(r.toRect());
     int cost = 0;
     for (int ix = 0; ix < subMask.width(); ++ix) {
         for (int iy = 0; iy < subMask.height(); ++iy) {
             cost += QColor(subMask.pixel(ix, iy)).red();
         }
     }
 
     return float(cost);
 }
 
 void KPlotWidget::paintEvent(QPaintEvent *e)
 {
     // let QFrame draw its default stuff (like the frame)
     QFrame::paintEvent(e);
     QPainter p;
 
     p.begin(this);
     p.setRenderHint(QPainter::Antialiasing, d->useAntialias);
     p.fillRect(rect(), backgroundColor());
     p.translate(leftPadding() + 0.5, topPadding() + 0.5);
 
     setPixRect();
     p.setClipRect(d->pixRect);
     p.setClipping(true);
 
     resetPlotMask();
 
     for (KPlotObject *po : std::as_const(d->objectList)) {
         po->draw(&p, this);
     }
 
     // DEBUG: Draw the plot mask
     //    p.drawImage( 0, 0, d->plotMask );
 
     p.setClipping(false);
     drawAxes(&p);
 
     p.end();
 }
 
 void KPlotWidget::drawAxes(QPainter *p)
 {
     if (d->showGrid) {
         p->setPen(gridColor());
 
         // Grid lines are placed at locations of primary axes' major tickmarks
         // vertical grid lines
         const QList<double> majMarks = axis(BottomAxis)->majorTickMarks();
         for (const double xx : majMarks) {
             double px = d->pixRect.width() * (xx - d->dataRect.x()) / d->dataRect.width();
             p->drawLine(QPointF(px, 0.0), QPointF(px, double(d->pixRect.height())));
         }
         // horizontal grid lines
         const QList<double> leftTickMarks = axis(LeftAxis)->majorTickMarks();
         for (const double yy : leftTickMarks) {
             double py = d->pixRect.height() * (1.0 - (yy - d->dataRect.y()) / d->dataRect.height());
             p->drawLine(QPointF(0.0, py), QPointF(double(d->pixRect.width()), py));
         }
     }
 
     p->setPen(foregroundColor());
     p->setBrush(Qt::NoBrush);
 
     // set small font for tick labels
     QFont f = p->font();
     int s = f.pointSize();
     f.setPointSize(s - 2);
     p->setFont(f);
 
     /*** BottomAxis ***/
     KPlotAxis *a = axis(BottomAxis);
     if (a->isVisible()) {
         // Draw axis line
         p->drawLine(0, d->pixRect.height(), d->pixRect.width(), d->pixRect.height());
 
         // Draw major tickmarks
         const QList<double> majMarks = a->majorTickMarks();
         for (const double xx : majMarks) {
             double px = d->pixRect.width() * (xx - d->dataRect.x()) / d->dataRect.width();
             if (px > 0 && px < d->pixRect.width()) {
                 p->drawLine(QPointF(px, double(d->pixRect.height() - TICKOFFSET)), //
                             QPointF(px, double(d->pixRect.height() - BIGTICKSIZE - TICKOFFSET)));
 
                 // Draw ticklabel
                 if (a->areTickLabelsShown()) {
                     QRect r(int(px) - BIGTICKSIZE, d->pixRect.height() + BIGTICKSIZE, 2 * BIGTICKSIZE, BIGTICKSIZE);
                     p->drawText(r, Qt::AlignCenter | Qt::TextDontClip, a->tickLabel(xx));
                 }
             }
         }
 
         // Draw minor tickmarks
         const QList<double> minTickMarks = a->minorTickMarks();
         for (const double xx : minTickMarks) {
             double px = d->pixRect.width() * (xx - d->dataRect.x()) / d->dataRect.width();
             if (px > 0 && px < d->pixRect.width()) {
                 p->drawLine(QPointF(px, double(d->pixRect.height() - TICKOFFSET)), //
                             QPointF(px, double(d->pixRect.height() - SMALLTICKSIZE - TICKOFFSET)));
             }
         }
 
         // Draw BottomAxis Label
         if (!a->label().isEmpty()) {
             QRect r(0, d->pixRect.height() + 2 * YPADDING, d->pixRect.width(), YPADDING);
             p->drawText(r, Qt::AlignCenter, a->label());
         }
     } // End of BottomAxis
 
     /*** LeftAxis ***/
     a = axis(LeftAxis);
     if (a->isVisible()) {
         // Draw axis line
         p->drawLine(0, 0, 0, d->pixRect.height());
 
         // Draw major tickmarks
         const QList<double> majMarks = a->majorTickMarks();
         for (const double yy : majMarks) {
             double py = d->pixRect.height() * (1.0 - (yy - d->dataRect.y()) / d->dataRect.height());
             if (py > 0 && py < d->pixRect.height()) {
                 p->drawLine(QPointF(TICKOFFSET, py), QPointF(double(TICKOFFSET + BIGTICKSIZE), py));
 
                 // Draw ticklabel
                 if (a->areTickLabelsShown()) {
                     QRect r(-2 * BIGTICKSIZE - SMALLTICKSIZE, int(py) - SMALLTICKSIZE, 2 * BIGTICKSIZE, 2 * SMALLTICKSIZE);
                     p->drawText(r, Qt::AlignRight | Qt::AlignVCenter | Qt::TextDontClip, a->tickLabel(yy));
                 }
             }
         }
 
         // Draw minor tickmarks
         const QList<double> minTickMarks = a->minorTickMarks();
         for (const double yy : minTickMarks) {
             double py = d->pixRect.height() * (1.0 - (yy - d->dataRect.y()) / d->dataRect.height());
             if (py > 0 && py < d->pixRect.height()) {
                 p->drawLine(QPointF(TICKOFFSET, py), QPointF(double(TICKOFFSET + SMALLTICKSIZE), py));
             }
         }
 
         // Draw LeftAxis Label.  We need to draw the text sideways.
         if (!a->label().isEmpty()) {
             // store current painter translation/rotation state
             p->save();
 
             // translate coord sys to left corner of axis label rectangle, then rotate 90 degrees.
             p->translate(-3 * XPADDING, d->pixRect.height());
             p->rotate(-90.0);
 
             QRect r(0, 0, d->pixRect.height(), XPADDING);
             p->drawText(r, Qt::AlignCenter, a->label()); // draw the label, now that we are sideways
 
             p->restore(); // restore translation/rotation state
         }
     } // End of LeftAxis
 
     // Prepare for top and right axes; we may need the secondary data rect
     double x0 = d->dataRect.x();
     double y0 = d->dataRect.y();
     double dw = d->dataRect.width();
     double dh = d->dataRect.height();
     if (secondaryDataRect().isValid()) {
         x0 = secondaryDataRect().x();
         y0 = secondaryDataRect().y();
         dw = secondaryDataRect().width();
         dh = secondaryDataRect().height();
     }
 
     /*** TopAxis ***/
     a = axis(TopAxis);
     if (a->isVisible()) {
         // Draw axis line
         p->drawLine(0, 0, d->pixRect.width(), 0);
 
         // Draw major tickmarks
         const QList<double> majMarks = a->majorTickMarks();
         for (const double xx : majMarks) {
             double px = d->pixRect.width() * (xx - x0) / dw;
             if (px > 0 && px < d->pixRect.width()) {
                 p->drawLine(QPointF(px, TICKOFFSET), QPointF(px, double(BIGTICKSIZE + TICKOFFSET)));
 
                 // Draw ticklabel
                 if (a->areTickLabelsShown()) {
                     QRect r(int(px) - BIGTICKSIZE, (int)-1.5 * BIGTICKSIZE, 2 * BIGTICKSIZE, BIGTICKSIZE);
                     p->drawText(r, Qt::AlignCenter | Qt::TextDontClip, a->tickLabel(xx));
                 }
             }
         }
 
         // Draw minor tickmarks
         const QList<double> minMarks = a->minorTickMarks();
         for (const double xx : minMarks) {
             double px = d->pixRect.width() * (xx - x0) / dw;
             if (px > 0 && px < d->pixRect.width()) {
                 p->drawLine(QPointF(px, TICKOFFSET), QPointF(px, double(SMALLTICKSIZE + TICKOFFSET)));
             }
         }
 
         // Draw TopAxis Label
         if (!a->label().isEmpty()) {
             QRect r(0, 0 - 3 * YPADDING, d->pixRect.width(), YPADDING);
             p->drawText(r, Qt::AlignCenter, a->label());
         }
     } // End of TopAxis
 
     /*** RightAxis ***/
     a = axis(RightAxis);
     if (a->isVisible()) {
         // Draw axis line
         p->drawLine(d->pixRect.width(), 0, d->pixRect.width(), d->pixRect.height());
 
         // Draw major tickmarks
         const QList<double> majMarks = a->majorTickMarks();
         for (const double yy : majMarks) {
             double py = d->pixRect.height() * (1.0 - (yy - y0) / dh);
             if (py > 0 && py < d->pixRect.height()) {
                 p->drawLine(QPointF(double(d->pixRect.width() - TICKOFFSET), py), //
                             QPointF(double(d->pixRect.width() - TICKOFFSET - BIGTICKSIZE), py));
 
                 // Draw ticklabel
                 if (a->areTickLabelsShown()) {
                     QRect r(d->pixRect.width() + SMALLTICKSIZE, int(py) - SMALLTICKSIZE, 2 * BIGTICKSIZE, 2 * SMALLTICKSIZE);
                     p->drawText(r, Qt::AlignLeft | Qt::AlignVCenter | Qt::TextDontClip, a->tickLabel(yy));
                 }
             }
         }
 
         // Draw minor tickmarks
         const QList<double> minMarks = a->minorTickMarks();
         for (const double yy : minMarks) {
             double py = d->pixRect.height() * (1.0 - (yy - y0) / dh);
             if (py > 0 && py < d->pixRect.height()) {
                 p->drawLine(QPointF(double(d->pixRect.width() - 0.0), py), QPointF(double(d->pixRect.width() - 0.0 - SMALLTICKSIZE), py));
             }
         }
 
         // Draw RightAxis Label.  We need to draw the text sideways.
         if (!a->label().isEmpty()) {
             // store current painter translation/rotation state
             p->save();
 
             // translate coord sys to left corner of axis label rectangle, then rotate 90 degrees.
             p->translate(d->pixRect.width() + 2 * XPADDING, d->pixRect.height());
             p->rotate(-90.0);
 
             QRect r(0, 0, d->pixRect.height(), XPADDING);
             p->drawText(r, Qt::AlignCenter, a->label()); // draw the label, now that we are sideways
 
             p->restore(); // restore translation/rotation state
         }
     } // End of RightAxis
 }
 
 int KPlotWidget::leftPadding() const
 {
     if (d->leftPadding >= 0) {
         return d->leftPadding;
     }
     const KPlotAxis *a = axis(LeftAxis);
     if (a && a->isVisible() && a->areTickLabelsShown()) {
         return !a->label().isEmpty() ? 3 * XPADDING : 2 * XPADDING;
     }
     return XPADDING;
 }
 
 int KPlotWidget::rightPadding() const
 {
     if (d->rightPadding >= 0) {
         return d->rightPadding;
     }
     const KPlotAxis *a = axis(RightAxis);
     if (a && a->isVisible() && a->areTickLabelsShown()) {
         return !a->label().isEmpty() ? 3 * XPADDING : 2 * XPADDING;
     }
     return XPADDING;
 }
 
 int KPlotWidget::topPadding() const
 {
     if (d->topPadding >= 0) {
         return d->topPadding;
     }
     const KPlotAxis *a = axis(TopAxis);
     if (a && a->isVisible() && a->areTickLabelsShown()) {
         return !a->label().isEmpty() ? 3 * YPADDING : 2 * YPADDING;
     }
     return YPADDING;
 }
 
 int KPlotWidget::bottomPadding() const
 {
     if (d->bottomPadding >= 0) {
         return d->bottomPadding;
     }
     const KPlotAxis *a = axis(BottomAxis);
     if (a && a->isVisible() && a->areTickLabelsShown()) {
         return !a->label().isEmpty() ? 3 * YPADDING : 2 * YPADDING;
     }
     return YPADDING;
 }
 
 void KPlotWidget::setLeftPadding(int padding)
 {
     d->leftPadding = padding;
 }
 
 void KPlotWidget::setRightPadding(int padding)
 {
     d->rightPadding = padding;
 }
 
 void KPlotWidget::setTopPadding(int padding)
 {
     d->topPadding = padding;
 }
 
 void KPlotWidget::setBottomPadding(int padding)
 {
     d->bottomPadding = padding;
 }
 
 void KPlotWidget::setDefaultPaddings()
 {
     d->leftPadding = -1;
     d->rightPadding = -1;
     d->topPadding = -1;
     d->bottomPadding = -1;
 }
 
 #include "moc_kplotwidget.cpp"