qwt_plot_marker.cpp 7.78 KB
Newer Older
pixhawk's avatar
pixhawk committed
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

// vim: expandtab

#include <qpainter.h>
#include "qwt_painter.h"
#include "qwt_scale_map.h"
#include "qwt_plot_marker.h"
#include "qwt_symbol.h"
#include "qwt_text.h"
#include "qwt_math.h"

static const int LabelDist = 2;

class QwtPlotMarker::PrivateData
{
public:
    PrivateData():
        align(Qt::AlignCenter),
        style(NoLine),
        xValue(0.0),
        yValue(0.0)
    {
        symbol = new QwtSymbol();
    }

    ~PrivateData()
    {
        delete symbol;
    }

    QwtText label;
#if QT_VERSION < 0x040000
    int align;
#else
    Qt::Alignment align;
#endif
    QPen pen;
    QwtSymbol *symbol;
    LineStyle style;

    double xValue;
    double yValue;
};

//! Sets alignment to Qt::AlignCenter, and style to NoLine
QwtPlotMarker::QwtPlotMarker():
    QwtPlotItem(QwtText("Marker"))
{
    d_data = new PrivateData;
    setZ(30.0);
}

//! Destructor
QwtPlotMarker::~QwtPlotMarker()
{
    delete d_data;
}

//! \return QwtPlotItem::Rtti_PlotMarker
int QwtPlotMarker::rtti() const
{
    return QwtPlotItem::Rtti_PlotMarker;
}

//! Return Value
QwtDoublePoint QwtPlotMarker::value() const
{
    return QwtDoublePoint(d_data->xValue, d_data->yValue);
}

//! Return x Value
double QwtPlotMarker::xValue() const 
{ 
    return d_data->xValue; 
}

//! Return y Value
double QwtPlotMarker::yValue() const 
{ 
    return d_data->yValue; 
}

//! Set Value
void QwtPlotMarker::setValue(const QwtDoublePoint& pos)
{
    setValue(pos.x(), pos.y());
}

//! Set Value
void QwtPlotMarker::setValue(double x, double y) 
{
    if ( x != d_data->xValue || y != d_data->yValue )
    {
        d_data->xValue = x; 
        d_data->yValue = y; 
        itemChanged(); 
    }
}

//! Set X Value
void QwtPlotMarker::setXValue(double x) 
{ 
    setValue(x, d_data->yValue);
}

//! Set Y Value
void QwtPlotMarker::setYValue(double y) 
{ 
    setValue(d_data->xValue, y);
}

/*!
  \brief Draw the marker
  \param p Painter
  \param xMap x Scale Map
  \param yMap y Scale Map
  \param r Bounding rect, where to paint
*/
void QwtPlotMarker::draw(QPainter *p,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRect &r) const
{
    const int x = xMap.transform(d_data->xValue);
    const int y = yMap.transform(d_data->yValue);

    // draw lines
    if (d_data->style != NoLine)
    {
        p->setPen(d_data->pen);
        if ((d_data->style == HLine) || (d_data->style == Cross))
            QwtPainter::drawLine(p, r.left(), y, r.right(), y);
        if ((d_data->style == VLine)||(d_data->style == Cross))
            QwtPainter::drawLine(p, x, r.top(), x, r.bottom());
    }

    // draw symbol
    QSize sSym(0, 0);
    if (d_data->symbol->style() != QwtSymbol::NoSymbol)
    {
        sSym = d_data->symbol->size();
        d_data->symbol->draw(p, x, y);
    }

    // draw label
    if (!d_data->label.isEmpty())
    {
        int xlw = qwtMax(int(d_data->pen.width()), 1);
        int ylw = xlw;
        int xlw1;
        int ylw1;

        const int xLabelDist = 
            QwtPainter::metricsMap().screenToLayoutX(LabelDist);
        const int yLabelDist = 
            QwtPainter::metricsMap().screenToLayoutY(LabelDist);

        if ((d_data->style == VLine) || (d_data->style == HLine))
        {
            xlw1 = (xlw + 1) / 2 + xLabelDist;
            xlw = xlw / 2 + xLabelDist;
            ylw1 = (ylw + 1) / 2 + yLabelDist;
            ylw = ylw / 2 + yLabelDist;
        }
        else 
        {
            xlw1 = qwtMax((xlw + 1) / 2, (sSym.width() + 1) / 2) + xLabelDist;
            xlw = qwtMax(xlw / 2, (sSym.width() + 1) / 2) + xLabelDist;
            ylw1 = qwtMax((ylw + 1) / 2, (sSym.height() + 1) / 2) + yLabelDist;
            ylw = qwtMax(ylw / 2, (sSym. height() + 1) / 2) + yLabelDist;
        }

        QRect tr(QPoint(0, 0), d_data->label.textSize(p->font()));
        tr.moveCenter(QPoint(0, 0));

        int dx = x;
        int dy = y;

        if (d_data->style == VLine)
        {
            if (d_data->align & (int) Qt::AlignTop)
                dy = r.top() + yLabelDist - tr.y();
            else if (d_data->align & (int) Qt::AlignBottom)
                dy = r.bottom() - yLabelDist + tr.y();
            else
                dy = r.top() + r.height() / 2;
        }
        else
        {
            if (d_data->align & (int) Qt::AlignTop)
                dy += tr.y() - ylw1;
            else if (d_data->align & (int) Qt::AlignBottom)
                dy -= tr.y() - ylw1;
        }


        if (d_data->style == HLine)
        {
            if (d_data->align & (int) Qt::AlignLeft)
                dx = r.left() + xLabelDist - tr.x();
            else if (d_data->align & (int) Qt::AlignRight)
                dx = r.right() - xLabelDist + tr.x();
            else
                dx = r.left() + r.width() / 2;
        }
        else
        {
            if (d_data->align & (int) Qt::AlignLeft)
                dx += tr.x() - xlw1;
            else if (d_data->align & (int) Qt::AlignRight)
                dx -= tr.x() - xlw1;
        }

#if QT_VERSION < 0x040000
        tr.moveBy(dx, dy);
#else
        tr.translate(dx, dy);
#endif
        d_data->label.draw(p, tr);
    }
}

/*!
  \brief Set the line style
  \param st Line style. Can be one of QwtPlotMarker::NoLine,
    HLine, VLine or Cross
  \sa lineStyle()
*/
void QwtPlotMarker::setLineStyle(QwtPlotMarker::LineStyle st)
{
    if ( st != d_data->style )
    {
        d_data->style = st;
        itemChanged();
    }
}

/*!
  \return the line style
  \sa For a description of line styles, see QwtPlotMarker::setLineStyle()
*/
QwtPlotMarker::LineStyle QwtPlotMarker::lineStyle() const 
{ 
    return d_data->style; 
}

/*!
  \brief Assign a symbol
  \param s New symbol 
  \sa symbol()
*/
void QwtPlotMarker::setSymbol(const QwtSymbol &s)
{
    delete d_data->symbol;
    d_data->symbol = s.clone();
    itemChanged();
}

/*!
  \return the symbol
  \sa setSymbol(), QwtSymbol
*/
const QwtSymbol &QwtPlotMarker::symbol() const 
{ 
    return *d_data->symbol; 
}

/*!
  \brief Set the label
  \param label label text
  \sa label()
*/
void QwtPlotMarker::setLabel(const QwtText& label)
{
    if ( label != d_data->label )
    {
        d_data->label = label;
        itemChanged();
    }
}

/*!
  \return the label
  \sa setLabel()
*/
QwtText QwtPlotMarker::label() const 
{ 
    return d_data->label; 
}

/*!
  \brief Set the alignment of the label

  The alignment determines where the label is drawn relative to
  the marker's position.

  \param align Alignment. A combination of AlignTop, AlignBottom,
    AlignLeft, AlignRight, AlignCenter, AlgnHCenter,
    AlignVCenter.  
  \sa labelAlignment()
*/
#if QT_VERSION < 0x040000
void QwtPlotMarker::setLabelAlignment(int align)
#else
void QwtPlotMarker::setLabelAlignment(Qt::Alignment align)
#endif
{
    if ( align == d_data->align )
        return;
    
    d_data->align = align;
    itemChanged();
}

/*!
  \return the label alignment
  \sa setLabelAlignment()
*/
#if QT_VERSION < 0x040000
int QwtPlotMarker::labelAlignment() const 
#else
Qt::Alignment QwtPlotMarker::labelAlignment() const 
#endif
{ 
    return d_data->align; 
}

/*!
  \brief Specify a pen for the line.
  \param p New pen
  \sa linePen()
*/
void QwtPlotMarker::setLinePen(const QPen &p)
{
    if ( p != d_data->pen )
    {
        d_data->pen = p;
        itemChanged();
    }
}

/*!
  \return the line pen
  \sa setLinePen()
*/
const QPen &QwtPlotMarker::linePen() const 
{ 
    return d_data->pen; 
}

QwtDoubleRect QwtPlotMarker::boundingRect() const
{
    return QwtDoubleRect(d_data->xValue, d_data->yValue, 0.0, 0.0);
}