qwt_plot_axis.cpp 15.3 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647
/* -*- 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
 *****************************************************************************/

#include "qwt_plot.h"
#include "qwt_math.h"
#include "qwt_scale_widget.h"
#include "qwt_scale_div.h"
#include "qwt_scale_engine.h"

class QwtPlot::AxisData
{
public:
    bool isEnabled;
    bool doAutoScale;

    double minValue;
    double maxValue;
    double stepSize;

    int maxMajor;
    int maxMinor;

    QwtScaleDiv scaleDiv;
    QwtScaleEngine *scaleEngine;
    QwtScaleWidget *scaleWidget;
};

//! Initialize axes
void QwtPlot::initAxesData()
{
    int axisId;

    for( axisId = 0; axisId < axisCnt; axisId++)
        d_axisData[axisId] = new AxisData;

    d_axisData[yLeft]->scaleWidget = 
        new QwtScaleWidget(QwtScaleDraw::LeftScale, this);
    d_axisData[yRight]->scaleWidget = 
        new QwtScaleWidget(QwtScaleDraw::RightScale, this);
    d_axisData[xTop]->scaleWidget = 
        new QwtScaleWidget(QwtScaleDraw::TopScale, this);
    d_axisData[xBottom]->scaleWidget = 
        new QwtScaleWidget(QwtScaleDraw::BottomScale, this);


    QFont fscl(fontInfo().family(), 10);
    QFont fttl(fontInfo().family(), 12, QFont::Bold);

    for(axisId = 0; axisId < axisCnt; axisId++)
    {
        AxisData &d = *d_axisData[axisId];

        d.scaleWidget->setFont(fscl);
        d.scaleWidget->setMargin(2);

        QwtText text = d.scaleWidget->title();
        text.setFont(fttl);
        d.scaleWidget->setTitle(text);

        d.doAutoScale = true;

        d.minValue = 0.0;
        d.maxValue = 1000.0;
        d.stepSize = 0.0;

        d.maxMinor = 5;
        d.maxMajor = 8;

        d.scaleEngine = new QwtLinearScaleEngine;

        d.scaleDiv.invalidate();
    }

    d_axisData[yLeft]->isEnabled = true;
    d_axisData[yRight]->isEnabled = false;
    d_axisData[xBottom]->isEnabled = true;
    d_axisData[xTop]->isEnabled = false;
}

void QwtPlot::deleteAxesData()
{
    for( int axisId = 0; axisId < axisCnt; axisId++)
    {
        delete d_axisData[axisId]->scaleEngine;
        delete d_axisData[axisId];
        d_axisData[axisId] = NULL;
    }
}

/*!
  \return specified axis, or NULL if axisId is invalid.
  \param axisId axis index
*/
const QwtScaleWidget *QwtPlot::axisWidget(int axisId) const
{
    if (axisValid(axisId))
        return d_axisData[axisId]->scaleWidget;

    return NULL;
}

/*!
  \return specified axis, or NULL if axisId is invalid.
  \param axisId axis index
*/
QwtScaleWidget *QwtPlot::axisWidget(int axisId)
{
    if (axisValid(axisId))
        return d_axisData[axisId]->scaleWidget;

    return NULL;
}

/*!
   Change the scale engine for an axis

  \param axisId axis index
  \param scaleEngine Scale engine

  \sa axisScaleEngine()
*/
void QwtPlot::setAxisScaleEngine(int axisId, QwtScaleEngine *scaleEngine)
{
    if (axisValid(axisId) && scaleEngine != NULL )
    {
        AxisData &d = *d_axisData[axisId];

        delete d.scaleEngine;
        d.scaleEngine = scaleEngine;

        d.scaleDiv.invalidate();

        autoRefresh();
    }
}

//! \return Scale engine for a specific axis
QwtScaleEngine *QwtPlot::axisScaleEngine(int axisId)
{
    if (axisValid(axisId))
        return d_axisData[axisId]->scaleEngine;
    else
        return NULL;
}

//! \return Scale engine for a specific axis
const QwtScaleEngine *QwtPlot::axisScaleEngine(int axisId) const
{
    if (axisValid(axisId))
        return d_axisData[axisId]->scaleEngine;
    else
        return NULL;
}
/*!
  \return \c true if autoscaling is enabled
  \param axisId axis index
*/
bool QwtPlot::axisAutoScale(int axisId) const
{
    if (axisValid(axisId))
        return d_axisData[axisId]->doAutoScale;
    else
        return false;
    
}

/*!
  \return \c true if a specified axis is enabled
  \param axisId axis index
*/
bool QwtPlot::axisEnabled(int axisId) const
{
    if (axisValid(axisId))
        return d_axisData[axisId]->isEnabled;
    else
        return false;
}

/*!
  \return the font of the scale labels for a specified axis
  \param axisId axis index
*/
QFont QwtPlot::axisFont(int axisId) const
{
    if (axisValid(axisId))
        return axisWidget(axisId)->font();
    else
        return QFont();
    
}

/*!
  \return the maximum number of major ticks for a specified axis
  \param axisId axis index
  sa setAxisMaxMajor()
*/
int QwtPlot::axisMaxMajor(int axisId) const
{
    if (axisValid(axisId))
        return d_axisData[axisId]->maxMajor;
    else
        return 0;
}

/*!
  \return the maximum number of minor ticks for a specified axis
  \param axisId axis index
  sa setAxisMaxMinor()
*/
int QwtPlot::axisMaxMinor(int axisId) const
{
    if (axisValid(axisId))
        return d_axisData[axisId]->maxMinor;
    else
        return 0;
}

/*!
  \brief Return the scale division of a specified axis

  axisScaleDiv(axisId)->lBound(), axisScaleDiv(axisId)->hBound()
  are the current limits of the axis scale.

  \param axisId axis index
  \return Scale division 

  \sa QwtScaleDiv, setAxisScaleDiv
*/
const QwtScaleDiv *QwtPlot::axisScaleDiv(int axisId) const
{
    if (!axisValid(axisId))
        return NULL;

    return &d_axisData[axisId]->scaleDiv;
}

/*!
  \brief Return the scale division of a specified axis

  axisScaleDiv(axisId)->lBound(), axisScaleDiv(axisId)->hBound()
  are the current limits of the axis scale.

  \param axisId axis index
  \return Scale division 

  \sa QwtScaleDiv, setAxisScaleDiv
*/
QwtScaleDiv *QwtPlot::axisScaleDiv(int axisId) 
{
    if (!axisValid(axisId))
        return NULL;

    return &d_axisData[axisId]->scaleDiv;
}

/*!
  \returns the scale draw of a specified axis
  \param axisId axis index
  \return specified scaleDraw for axis, or NULL if axis is invalid.
  \sa QwtScaleDraw
*/
const QwtScaleDraw *QwtPlot::axisScaleDraw(int axisId) const
{
    if (!axisValid(axisId))
        return NULL;

    return axisWidget(axisId)->scaleDraw();
}

/*!
  \returns the scale draw of a specified axis
  \param axisId axis index
  \return specified scaleDraw for axis, or NULL if axis is invalid.
  \sa QwtScaleDraw
*/
QwtScaleDraw *QwtPlot::axisScaleDraw(int axisId) 
{
    if (!axisValid(axisId))
        return NULL;

    return axisWidget(axisId)->scaleDraw();
}

/*!
   Return the step size parameter, that has been set
   in setAxisScale. This doesn't need to be the step size 
   of the current scale.

  \param axisId axis index
  \return step size parameter value

   \sa setAxisScale
*/ 
double QwtPlot::axisStepSize(int axisId) const
{
    if (!axisValid(axisId))
        return 0;

    return d_axisData[axisId]->stepSize;
}

/*!
  \return the title of a specified axis
  \param axisId axis index
*/
QwtText QwtPlot::axisTitle(int axisId) const
{
    if (axisValid(axisId))
        return axisWidget(axisId)->title();
    else
        return QwtText();
}

/*!
  \brief Enable or disable a specified axis

  When an axis is disabled, this only means that it is not
  visible on the screen. Curves, markers and can be attached
  to disabled axes, and transformation of screen coordinates
  into values works as normal.

  Only xBottom and yLeft are enabled by default.
  \param axisId axis index
  \param tf \c true (enabled) or \c false (disabled)
*/
void QwtPlot::enableAxis(int axisId, bool tf)
{
    if (axisValid(axisId) && tf != d_axisData[axisId]->isEnabled)
    {
        d_axisData[axisId]->isEnabled = tf;
        updateLayout();
    }
}

/*!
  Transform the x or y coordinate of a position in the
  drawing region into a value.
  \param axisId axis index
  \param pos position
  \warning The position can be an x or a y coordinate,
           depending on the specified axis.
*/
double QwtPlot::invTransform(int axisId, int pos) const
{
    if (axisValid(axisId))
       return(canvasMap(axisId).invTransform(pos));
    else
       return 0.0;
}


/*!
  \brief Transform a value into a coordinate in the plotting region
  \param axisId axis index
  \param value value
  \return X or y coordinate in the plotting region corresponding
          to the value.
*/
int QwtPlot::transform(int axisId, double value) const
{
    if (axisValid(axisId))
       return(canvasMap(axisId).transform(value));
    else
       return 0;
    
}

/*!
  \brief Change the font of an axis
  \param axisId axis index
  \param f font
  \warning This function changes the font of the tick labels,
           not of the axis title.
*/
void QwtPlot::setAxisFont(int axisId, const QFont &f)
{
    if (axisValid(axisId))
        axisWidget(axisId)->setFont(f);
}

/*!
  \brief Enable autoscaling for a specified axis

  This member function is used to switch back to autoscaling mode
  after a fixed scale has been set. Autoscaling is enabled by default.

  \param axisId axis index
  \sa QwtPlot::setAxisScale(), QwtPlot::setAxisScaleDiv()
*/
void QwtPlot::setAxisAutoScale(int axisId)
{
    if (axisValid(axisId) && !d_axisData[axisId]->doAutoScale )
    {
        d_axisData[axisId]->doAutoScale = true;
        autoRefresh();
    }
}

/*!
  \brief Disable autoscaling and specify a fixed scale for a selected axis.
  \param axisId axis index
  \param min
  \param max minimum and maximum of the scale
  \param stepSize Major step size. If <code>step == 0</code>, the step size is
            calculated automatically using the maxMajor setting.
  \sa setAxisMaxMajor(), setAxisAutoScale()
*/
void QwtPlot::setAxisScale(int axisId, double min, double max, double stepSize)
{
    if (axisValid(axisId))
    {
        AxisData &d = *d_axisData[axisId];

        d.doAutoScale = false;
        d.scaleDiv.invalidate();

        d.minValue = min;
        d.maxValue = max;
        d.stepSize = stepSize;
            
        autoRefresh();
    }
}

/*!
  \brief Disable autoscaling and specify a fixed scale for a selected axis.
  \param axisId axis index
  \param scaleDiv Scale division
  \sa setAxisScale(), setAxisAutoScale()
*/
void QwtPlot::setAxisScaleDiv(int axisId, const QwtScaleDiv &scaleDiv)
{
    if (axisValid(axisId))
    {
        AxisData &d = *d_axisData[axisId];

        d.doAutoScale = false;
        d.scaleDiv = scaleDiv;

        autoRefresh();
    }
}

/*!
  \brief Set a scale draw
  \param axisId axis index
  \param scaleDraw object responsible for drawing scales.

  By passing scaleDraw it is possible to extend QwtScaleDraw
  functionality and let it take place in QwtPlot. Please note
  that scaleDraw has to be created with new and will be deleted
  by the corresponding QwtScale member ( like a child object ).

  \sa QwtScaleDraw, QwtScaleWidget
  \warning The attributes of scaleDraw will be overwritten by those of the  
           previous QwtScaleDraw. 
*/

void QwtPlot::setAxisScaleDraw(int axisId, QwtScaleDraw *scaleDraw)
{
    if (axisValid(axisId))
    {
        axisWidget(axisId)->setScaleDraw(scaleDraw);
        autoRefresh();
    }
}

/*!
  Change the alignment of the tick labels
  \param axisId axis index
  \param alignment Or'd Qt::AlignmentFlags <see qnamespace.h>
  \sa QwtScaleDraw::setLabelAlignment()
*/
#if QT_VERSION < 0x040000
void QwtPlot::setAxisLabelAlignment(int axisId, int alignment)
#else
void QwtPlot::setAxisLabelAlignment(int axisId, Qt::Alignment alignment)
#endif
{
    if (axisValid(axisId))
        axisWidget(axisId)->setLabelAlignment(alignment);
}

/*!
  Rotate all tick labels
  \param axisId axis index
  \param rotation Angle in degrees. When changing the label rotation,
                  the label alignment might be adjusted too.
  \sa QwtScaleDraw::setLabelRotation(), QwtPlot::setAxisLabelAlignment
*/
void QwtPlot::setAxisLabelRotation(int axisId, double rotation)
{
    if (axisValid(axisId))
        axisWidget(axisId)->setLabelRotation(rotation);
}

/*!
  Set the maximum number of minor scale intervals for a specified axis

  \param axisId axis index
  \param maxMinor maximum number of minor steps
  \sa axisMaxMinor()
*/
void QwtPlot::setAxisMaxMinor(int axisId, int maxMinor)
{
    if (axisValid(axisId))
    {
        if ( maxMinor < 0 )
            maxMinor = 0;
        if ( maxMinor > 100 )
            maxMinor = 100;
            
        AxisData &d = *d_axisData[axisId];

        if ( maxMinor != d.maxMinor )
        {
            d.maxMinor = maxMinor;
            d.scaleDiv.invalidate();
            autoRefresh();
        }
    }
}

/*!
  Set the maximum number of major scale intervals for a specified axis

  \param axisId axis index
  \param maxMajor maximum number of major steps
  \sa axisMaxMajor()
*/
void QwtPlot::setAxisMaxMajor(int axisId, int maxMajor)
{
    if (axisValid(axisId))
    {
        if ( maxMajor < 1 )
            maxMajor = 1;
        if ( maxMajor > 1000 )
            maxMajor = 10000;
            
        AxisData &d = *d_axisData[axisId];
        if ( maxMajor != d.maxMinor )
        {
            d.maxMajor = maxMajor;
            d.scaleDiv.invalidate();
            autoRefresh();
        }
    }
}

/*!
  \brief Change the title of a specified axis
  \param axisId axis index
  \param title axis title
*/
void QwtPlot::setAxisTitle(int axisId, const QString &title)
{
    if (axisValid(axisId))
        axisWidget(axisId)->setTitle(title);
}

/*!
  \brief Change the title of a specified axis
  \param axisId axis index
  \param title axis title
*/
void QwtPlot::setAxisTitle(int axisId, const QwtText &title)
{
    if (axisValid(axisId))
        axisWidget(axisId)->setTitle(title);
}

//! Rebuild the scales
void QwtPlot::updateAxes() 
{
    // Find bounding interval of the item data
    // for all axes, where autoscaling is enabled
    
    QwtDoubleInterval intv[axisCnt];

    const QwtPlotItemList& itmList = itemList();

    QwtPlotItemIterator it;
    for ( it = itmList.begin(); it != itmList.end(); ++it )
    {
        const QwtPlotItem *item = *it;

        if ( !item->testItemAttribute(QwtPlotItem::AutoScale) )
            continue;

        if ( axisAutoScale(item->xAxis()) || axisAutoScale(item->yAxis()) )
        {
            const QwtDoubleRect rect = item->boundingRect();
            intv[item->xAxis()] |= QwtDoubleInterval(rect.left(), rect.right());
            intv[item->yAxis()] |= QwtDoubleInterval(rect.top(), rect.bottom());
        }
    }

    // Adjust scales

    for (int axisId = 0; axisId < axisCnt; axisId++)
    {
        AxisData &d = *d_axisData[axisId];

        double minValue = d.minValue;
        double maxValue = d.maxValue;
        double stepSize = d.stepSize;

        if ( d.doAutoScale && intv[axisId].isValid() )
        {
            d.scaleDiv.invalidate();

            minValue = intv[axisId].minValue();
            maxValue = intv[axisId].maxValue();

            d.scaleEngine->autoScale(d.maxMajor, 
                minValue, maxValue, stepSize);
        }
        if ( !d.scaleDiv.isValid() )
        {
            d.scaleDiv = d.scaleEngine->divideScale(
                minValue, maxValue, 
                d.maxMajor, d.maxMinor, stepSize);
        }

        QwtScaleWidget *scaleWidget = axisWidget(axisId);
        scaleWidget->setScaleDiv(
            d.scaleEngine->transformation(), d.scaleDiv);

        int startDist, endDist;
        scaleWidget->getBorderDistHint(startDist, endDist);
        scaleWidget->setBorderDist(startDist, endDist);
    }

    for ( it = itmList.begin(); it != itmList.end(); ++it )
    {
        QwtPlotItem *item = *it;
        item->updateScaleDiv( *axisScaleDiv(item->xAxis()),
            *axisScaleDiv(item->yAxis()));
    }
}