QStringList GraphicsScene::positionHasChangedPointIdentifiers () const
{
LOG4CPP_INFO_S ((*mainCat)) << "GraphicsScene::positionHasChangedPointIdentifiers";
QStringList movedIds;
const QList<QGraphicsItem*> &items = QGraphicsScene::items();
QList<QGraphicsItem*>::const_iterator itr;
for (itr = items.begin(); itr != items.end(); itr++) {
const QGraphicsItem *item = *itr;
// Skip the image and only keep the Points
bool isPoint = (item->data (DATA_KEY_GRAPHICS_ITEM_TYPE).toInt () == GRAPHICS_ITEM_TYPE_POINT);
if (isPoint) {
QString identifier = item->data (DATA_KEY_IDENTIFIER).toString ();
bool positionHasChanged = item->data (DATA_KEY_POSITION_HAS_CHANGED).toBool ();
LOG4CPP_DEBUG_S ((*mainCat)) << "GraphicsScene::positionHasChangedPointIdentifiers"
<< " identifier=" << identifier.toLatin1().data()
<< " positionHasChanged=" << (positionHasChanged ? "yes" : "no");
if (isPoint && positionHasChanged) {
// Add Point to the list
movedIds << item->data(DATA_KEY_IDENTIFIER).toString ();
}
}
}
return movedIds;
}
void DigitizeStateSelect::handleContextMenuEventAxis34 (CmdMediator *cmdMediator,
const QString &pointIdentifier)
{
LOG4CPP_DEBUG_S ((*mainCat)) << "DigitizeStateSelect::handleContextMenuEventAxis34";
QPointF posScreen = cmdMediator->document().positionScreen (pointIdentifier);
QPointF posGraphBefore = cmdMediator->document().positionGraph (pointIdentifier);
bool isXOnly = cmdMediator->document().isXOnly (pointIdentifier);
// Ask user for coordinates
double x = posGraphBefore.x();
double y = posGraphBefore.y();
DlgEditPointAxis *dlg = new DlgEditPointAxis (context().mainWindow(),
cmdMediator->document().modelCoords(),
cmdMediator->document().modelGeneral(),
context().mainWindow().modelMainWindow(),
context().mainWindow().transformation(),
cmdMediator->document().documentAxesPointsRequired(),
isXOnly,
&x,
&y);
int rtn = dlg->exec ();
QPointF posGraphAfter = dlg->posGraph (isXOnly); // This call returns new values for isXOnly and the graph position
delete dlg;
if (rtn == QDialog::Accepted) {
// User wants to edit this axis point, but let's perform sanity checks first
bool isError;
QString errorMessage;
context().mainWindow().cmdMediator()->document().checkEditPointAxis(pointIdentifier,
posScreen,
posGraphAfter,
isError,
errorMessage);
if (isError) {
QMessageBox::warning (0,
engaugeWindowTitle(),
errorMessage);
} else {
// Create a command to edit the point
CmdEditPointAxis *cmd = new CmdEditPointAxis (context().mainWindow(),
cmdMediator->document(),
pointIdentifier,
posGraphBefore,
posGraphAfter,
isXOnly);
context().appendNewCmd(cmdMediator,
cmd);
}
}
}
QVariant CurveNameList::data (const QModelIndex &index,
int role) const
{
LOG4CPP_DEBUG_S ((*mainCat)) << "CurveNameList::data"
<< " isRoot=" << (index.isValid () ? "no" : "yes")
<< " role=" << roleAsString (role).toLatin1 ().data ();
if (!index.isValid ()) {
// Root item
return QVariant ();
}
int row = index.row ();
if (row < 0 || row >= m_modelCurvesEntries.count ()) {
return QVariant();
}
if ((role != Qt::DisplayRole) &&
(role != Qt::EditRole)) {
return QVariant();
}
CurveNameListEntry curvesEntry (m_modelCurvesEntries.at (row));
if (index.column () == 0) {
return curvesEntry.curveNameCurrent();
} else if (index.column () == 1) {
return curvesEntry.curveNameOriginal();
} else if (index.column () == 2) {
return curvesEntry.numPoints ();
} else {
ENGAUGE_ASSERT (false);
return curvesEntry.curveNameOriginal(); // Default if asserts are disabled
}
}
void FormatCoordsUnits::formattedToUnformatted (const QString &xThetaFormatted,
const QString &yRadiusFormatted,
const DocumentModelCoords &modelCoords,
double &xThetaUnformatted,
double &yRadiusUnformatted) const
{
LOG4CPP_DEBUG_S ((*mainCat)) << "FormatCoordsUnits::formattedToUnformatted";
FormatCoordsUnitsStrategyNonPolarTheta formatNonPolarTheta;
FormatCoordsUnitsStrategyPolarTheta formatPolarTheta;
if (modelCoords.coordsType() == COORDS_TYPE_CARTESIAN) {
xThetaUnformatted = formatNonPolarTheta.formattedToUnformatted (xThetaFormatted,
modelCoords.coordUnitsX(),
modelCoords.coordUnitsDate(),
modelCoords.coordUnitsTime());
yRadiusUnformatted = formatNonPolarTheta.formattedToUnformatted (yRadiusFormatted,
modelCoords.coordUnitsY(),
modelCoords.coordUnitsDate(),
modelCoords.coordUnitsTime());
} else {
xThetaUnformatted = formatPolarTheta.formattedToUnformatted (xThetaFormatted,
modelCoords.coordUnitsTheta());
yRadiusUnformatted = formatNonPolarTheta.formattedToUnformatted (yRadiusFormatted,
modelCoords.coordUnitsRadius(),
modelCoords.coordUnitsDate(),
modelCoords.coordUnitsTime());
}
}
void DigitizeStatePointMatch::createTemporaryPoint (CmdMediator *cmdMediator,
const QPoint &posScreen)
{
LOG4CPP_DEBUG_S ((*mainCat)) << "DigitizeStatePointMatch::createTemporaryPoint";
GeometryWindow *NULL_GEOMETRY_WINDOW = nullptr;
const DocumentModelPointMatch &modelPointMatch = cmdMediator->document().modelPointMatch();
// Get point style for current graph, and then override with candidate color
const CurveStyles &curveStyles = cmdMediator->document().modelCurveStyles();
PointStyle pointStyle = curveStyles.pointStyle (activeCurve());
pointStyle.setPaletteColor (modelPointMatch.paletteColorCandidate());
// Temporary point that user can see while DlgEditPoint is active
GraphicsPoint *point = context().mainWindow().scene().createPoint(Point::temporaryPointIdentifier (),
pointStyle,
posScreen,
NULL_GEOMETRY_WINDOW);
context().mainWindow().scene().removeTemporaryPointIfExists(); // Only one temporary point at a time is allowed
context().mainWindow().scene().addTemporaryPoint (Point::temporaryPointIdentifier(),
point);
m_posCandidatePoint = posScreen;
}
int CurveNameList::rowCount (const QModelIndex & /* parent */) const
{
int count = m_modelCurvesEntries.count ();
LOG4CPP_DEBUG_S ((*mainCat)) << "CurveNameList::rowCount count=" << count;
return count;
}
void DigitizeStateContext::setDragMode (QGraphicsView::DragMode dragMode)
{
LOG4CPP_DEBUG_S ((*mainCat)) << "DigitizeStateContext::setDragMode";
if (m_imageIsLoaded) {
m_view.setDragMode (dragMode);
}
}
GridLineFactory::GridLineFactory(QGraphicsScene &scene,
const DocumentModelCoords &modelCoords) :
m_scene (scene),
m_pointRadius (0.0),
m_modelCoords (modelCoords),
m_isChecker (false)
{
LOG4CPP_DEBUG_S ((*mainCat)) << "GridLineFactory::GridLineFactory";
}
QCursor DigitizeStateAxis::cursor() const
{
LOG4CPP_DEBUG_S ((*mainCat)) << "DigitizeStateAxis::cursor";
CursorFactory cursorFactory;
QCursor cursor = cursorFactory.generate (context().cmdMediator().document().modelDigitizeCurve());
return cursor;
}
QStandardItem *CurveNameList::item(int row, int column) const
{
LOG4CPP_DEBUG_S ((*mainCat)) << "CurveNameList::item"
<< " row=" << row;
ENGAUGE_ASSERT (row < rowCount ());
return QStandardItemModel::item (row, column);
}
bool CurveNameList::setData (const QModelIndex &index,
const QVariant &value,
int role)
{
LOG4CPP_DEBUG_S ((*mainCat)) << "CurveNameList::setData"
<< " row=" << index.row()
<< " value=" << value.toString().toLatin1().data()
<< " role=" << roleAsString (role).toLatin1().data();
bool success;
if (role == Qt::EditRole) {
// Each curve name must be unique
if (curveNameIsAcceptable (value.toString(),
index.row())) {
// Curve name is fine
QModelIndex idxOld = QStandardItemModel::index (index.row(), CURVE_NAME_LIST_COLUMN_CURRENT);
// Old and new curve names
QString curveCurrentOld = data (idxOld).toString ();
QString curveCurrentNew = value.toString ();
// Remove old entry after saving original curve name
QString curveOriginal;
if (m_currentCurveToOriginalCurve.contains (curveCurrentOld)) {
// Remember old original curve name
curveOriginal = m_currentCurveToOriginalCurve [curveCurrentOld];
// Remove old entry
m_currentCurveToOriginalCurve.remove (curveCurrentOld);
// Add new entry
m_currentCurveToOriginalCurve [curveCurrentNew] = curveOriginal;
}
success = QStandardItemModel::setData (index,
value,
role);
} else {
// Curve name is unacceptable
success = false;
}
} else {
// For non-edits, this method just calls the superclass method
success = QStandardItemModel::setData (index,
value,
role);
}
return success;
}
void Checker::bindItemToScene(QGraphicsItem *item) const
{
LOG4CPP_DEBUG_S ((*mainCat)) << "Checker::bindItemToScene";
item->setOpacity (CHECKER_OPACITY);
item->setZValue (Z_VALUE_IN_FRONT);
item->setToolTip (QObject::tr ("Axes checker. If this does not align with the axes, then the axes points should be checked"));
m_scene.addItem (item);
}
QGraphicsItem *GridLineFactory::lineItem (const QPointF &posStartScreen,
const QPointF &posEndScreen) const
{
LOG4CPP_DEBUG_S ((*mainCat)) << "GridLineFactory::lineItem"
<< " posStartScreen=" << QPointFToString (posStartScreen).toLatin1().data()
<< " posEndScreen=" << QPointFToString (posEndScreen).toLatin1().data();
return new QGraphicsLineItem (QLineF (posStartScreen,
posEndScreen));
}
int FormatCoordsUnitsStrategyAbstractBase::precisionDigitsForRawNumber (double valueUnformatted,
double valueUnformattedOther,
bool isXTheta,
const DocumentModelGeneral &modelGeneral,
const Transformation &transformation) const
{
LOG4CPP_DEBUG_S ((*mainCat)) << "FormatCoordsUnitsStrategyAbstractBase::precisionDigitsForRawNumber";
const double PIXEL_SHIFT = 1;
const int DEFAULT_PRECISION = 5; // Precision used before transformation is available. Equal or greater than x/y pixel counts
if (transformation.transformIsDefined()) {
// Measure the resolution if the point is moved some number of pixels in screen coordinates
QPointF posGraph;
if (isXTheta) {
posGraph = QPointF (valueUnformatted,
valueUnformattedOther);
} else {
posGraph = QPointF (valueUnformattedOther,
valueUnformatted);
}
QPointF posScreen, posScreenShifted, posGraphShifted;
transformation.transformRawGraphToScreen (posGraph,
posScreen);
posScreenShifted = posScreen + QPointF (PIXEL_SHIFT, PIXEL_SHIFT);
transformation.transformScreenToRawGraph (posScreenShifted,
posGraphShifted);
double xResolutionPerPixel = (posGraphShifted.x() - posGraph.x()) / PIXEL_SHIFT;
double yResolutionPerPixel = (posGraphShifted.y() - posGraph.y()) / PIXEL_SHIFT;
double resolutionPerPixel = (isXTheta ? xResolutionPerPixel : yResolutionPerPixel);
// Compute number of digits ahead of the decimal point (any single decimal place would work but the decimal point is easiest)
int powerValue = qFloor (qLn (qAbs (valueUnformatted)) / qLn (10.0));
int powerResolution = qFloor (qLn (qAbs (resolutionPerPixel)) / qLn (10.0));
int numberDigitsForResolution = powerValue - powerResolution + 1 + modelGeneral.extraPrecision();
return numberDigitsForResolution + 1; // Add one just to be safe
} else {
return DEFAULT_PRECISION;
}
}
void GraphicsLinesForCurves::updateAfterCommand (GraphicsScene &scene,
const CurveStyles &curveStyles,
const QString &curveName,
const Point &point)
{
LOG4CPP_DEBUG_S ((*mainCat)) << "GraphicsLinesForCurves::updateAfterCommand"
<< " point=" << point.identifier().toLatin1().data()
<< " curveCount=" << m_graphicsLinesForCurve.count();
ENGAUGE_ASSERT (m_graphicsLinesForCurve.contains (curveName));
m_graphicsLinesForCurve [curveName]->updateAfterCommand (scene,
curveStyles.pointStyle(curveName),
point);
}
GridLineFactory::GridLineFactory(QGraphicsScene &scene,
int pointRadius,
const QList<Point> &pointsToIsolate,
const DocumentModelCoords &modelCoords) :
m_scene (scene),
m_pointRadius (pointRadius),
m_pointsToIsolate (pointsToIsolate),
m_modelCoords (modelCoords),
m_isChecker (true)
{
LOG4CPP_DEBUG_S ((*mainCat)) << "GridLineFactory::GridLineFactory"
<< " pointRadius=" << pointRadius
<< " pointsToIsolate=" << pointsToIsolate.count();
}
void DigitizeStateAxis::createTemporaryPoint (const QPointF &posScreen)
{
LOG4CPP_DEBUG_S ((*mainCat)) << "DigitizeStateAxis::createTemporaryPoint";
// Temporary point that user can see while DlgEditPoint is active
const Curve &curveAxes = context().cmdMediator().curveAxes();
PointStyle pointStyleAxes = curveAxes.curveStyle().pointStyle();
GraphicsPoint *point = context().mainWindow().scene().createPoint(Point::temporaryPointIdentifier (),
pointStyleAxes,
posScreen);
context().mainWindow().scene().addTemporaryPoint (Point::temporaryPointIdentifier(),
point);
}
QVariant GraphicsPointEllipse::itemChange(GraphicsItemChange change,
const QVariant &value)
{
if (change == QGraphicsItem::ItemPositionHasChanged) {
LOG4CPP_DEBUG_S ((*mainCat)) << "GraphicsPointEllipse::itemChange"
<< " identifier=" << data (DATA_KEY_IDENTIFIER).toString().toLatin1().data()
<< " positionHasChanged";
setData (DATA_KEY_POSITION_HAS_CHANGED, QVariant (true));
}
return QGraphicsEllipseItem::itemChange(change,
value);
}
CallbackSearchReturn CallbackDocumentHash::callback (const QString &curveName,
const Point &point)
{
// LOG4CPP_DEBUG_S is below
// Capture all important information about the point into the hash. A single string representing all of the point's details is
// created, which can be logged, and then that string is added to the hash
QString details;
details += curveName.toLatin1();
details += " " + point.identifier ();
details += " " + QPointFToString (point.posScreen());
if (point.hasOrdinal ()) {
details += " " + QString::number (point.ordinal ());
}
if (point.isAxisPoint()) {
if (m_documentAxesPointsRequired == DOCUMENT_AXES_POINTS_REQUIRED_3) {
// Axis point has one or coordinate
if (point.isXOnly()) {
details += " " + QString::number (point.posGraph().x());
} else {
details += " " + QString::number (point.posGraph().y());
}
} else {
// Axis point has two coordinates
details += " " + QPointFToString (point.posGraph());
}
}
LOG4CPP_DEBUG_S ((*mainCat)) << "CallbackDocumentHash::callback details=" << details.toLatin1().data();
// Add details to hash
m_documentHash.addData (details.toLatin1());
return CALLBACK_SEARCH_RETURN_CONTINUE;
}
void DigitizeStateAxis::createTemporaryPoint (CmdMediator *cmdMediator,
const QPointF &posScreen)
{
LOG4CPP_DEBUG_S ((*mainCat)) << "DigitizeStateAxis::createTemporaryPoint";
GeometryWindow *NULL_GEOMETRY_WINDOW = nullptr;
// Temporary point that user can see while DlgEditPointAxis is active
const Curve &curveAxes = cmdMediator->curveAxes();
PointStyle pointStyleAxes = curveAxes.curveStyle().pointStyle();
GraphicsPoint *point = context().mainWindow().scene().createPoint(Point::temporaryPointIdentifier (),
pointStyleAxes,
posScreen,
NULL_GEOMETRY_WINDOW);
context().mainWindow().scene().addTemporaryPoint (Point::temporaryPointIdentifier(),
point);
}
void FormatCoordsUnits::unformattedToFormatted (double xThetaUnformatted,
double yRadiusUnformatted,
const DocumentModelCoords &modelCoords,
QString &xThetaFormatted,
QString &yRadiusFormatted,
const Transformation &transformation) const
{
LOG4CPP_DEBUG_S ((*mainCat)) << "FormatCoordsUnits::unformattedToFormatted";
FormatCoordsUnitsStrategyNonPolarTheta formatNonPolarTheta;
FormatCoordsUnitsStrategyPolarTheta formatPolarTheta;
if (modelCoords.coordsType() == COORDS_TYPE_CARTESIAN) {
xThetaFormatted = formatNonPolarTheta.unformattedToFormatted (xThetaUnformatted,
modelCoords.coordUnitsX(),
modelCoords.coordUnitsDate(),
modelCoords.coordUnitsTime(),
IS_X_THETA,
transformation,
yRadiusUnformatted);
yRadiusFormatted = formatNonPolarTheta.unformattedToFormatted (yRadiusUnformatted,
modelCoords.coordUnitsY(),
modelCoords.coordUnitsDate(),
modelCoords.coordUnitsTime(),
IS_NOT_X_THETA,
transformation,
xThetaUnformatted);
} else {
xThetaFormatted = formatPolarTheta.unformattedToFormatted (xThetaUnformatted,
modelCoords.coordUnitsTheta(),
transformation,
yRadiusUnformatted);
yRadiusFormatted = formatNonPolarTheta.unformattedToFormatted (yRadiusUnformatted,
modelCoords.coordUnitsRadius(),
modelCoords.coordUnitsDate(),
modelCoords.coordUnitsTime(),
IS_NOT_X_THETA,
transformation,
xThetaUnformatted);
}
}
void GridLineFactory::finishActiveGridLine (const QPointF &posStartScreen,
const QPointF &posEndScreen,
double yFrom,
double yTo,
const Transformation &transformation,
GridLine &gridLine) const
{
LOG4CPP_DEBUG_S ((*mainCat)) << "GridLineFactory::finishActiveGridLine"
<< " posStartScreen=" << QPointFToString (posStartScreen).toLatin1().data()
<< " posEndScreen=" << QPointFToString (posEndScreen).toLatin1().data()
<< " yFrom=" << yFrom
<< " yTo=" << yTo;
QGraphicsItem *item;
if ((m_modelCoords.coordsType() == COORDS_TYPE_POLAR) &&
(yFrom == yTo)) {
// Linear cartesian radius
double radiusLinearCartesian = yFrom;
if (m_modelCoords.coordScaleYRadius() == COORD_SCALE_LOG) {
radiusLinearCartesian = transformation.logToLinearRadius(yFrom,
m_modelCoords.originRadius());
} else {
radiusLinearCartesian -= m_modelCoords.originRadius();
}
// Draw along an arc since this is a side of constant radius, and we have polar coordinates
item = ellipseItem (transformation,
radiusLinearCartesian,
posStartScreen,
posEndScreen);
} else {
// Draw straight line
item = lineItem (posStartScreen,
posEndScreen);
}
gridLine.add (item);
bindItemToScene (item);
}
void CurveNameList::setItem(int row,
int column,
QStandardItem *item)
{
// LOG4CPP is below
ENGAUGE_ASSERT (column == CURVE_NAME_LIST_COLUMN_CURRENT);
QString before = currentCurvesAsString ();
QStandardItemModel::setItem (row,
column,
item);
QString after = currentCurvesAsString ();
LOG4CPP_DEBUG_S ((*mainCat)) << "CurveNameList::setItem"
<< " row=" << row
<< " before=" << before.toLatin1().data()
<< " after=" << after.toLatin1().data();
}
bool CurveNameList::removeRows (int row,
int count,
const QModelIndex &parent)
{
// LOG4CPP is below
bool skip = (count != 1 || row < 0 || row > rowCount () || parent.isValid());
QString before, after;
if (!skip) {
before = currentCurvesAsString ();
// As documented for QAbstractItemModel, beginRemoveRows "emits the rowsAboutToBeRemoved() signal which connected views
// (or proxies) must handle before the data is removed. Otherwise, the views may end up in an invalid state."
beginRemoveRows (QModelIndex (),
row,
row + count - 1);
// We do not call QStandardItemModel::removeRow or QAbstractItemModel::removeRow here since that leads to an infinite loop when it calls this method
for (int rowRemove = row; rowRemove < row + count; rowRemove++) {
QStandardItemModel::removeRows (row,
count,
parent);
}
endRemoveRows ();
after = currentCurvesAsString ();
}
LOG4CPP_DEBUG_S ((*mainCat)) << "CurveNameList::removeRows"
<< " row=" << row
<< " count=" << count
<< " isRoot=" << (parent.isValid () ? "no" : "yes")
<< " skip=" << (skip ? "yes" : "no")
<< " before=" << before.toLatin1().data()
<< " after=" << after.toLatin1().data();
return true;
}
void DigitizeStatePointMatch::popCandidatePoint (CmdMediator *cmdMediator)
{
LOG4CPP_DEBUG_S ((*mainCat)) << "DigitizeStatePointMatch::popCandidatePoint";
if (m_candidatePoints.count() > 0) {
// Pop next point from list onto screen
QPoint posScreen = m_candidatePoints.first();
m_candidatePoints.pop_front ();
createTemporaryPoint(cmdMediator,
posScreen);
} else {
// No more points. Inform user
QMessageBox::information (nullptr,
QObject::tr ("Point Match"),
QObject::tr ("There are no more matching points"));
}
}
bool CurveNameList::removeRows (int row,
int count,
const QModelIndex &parent)
{
bool skip = (count != 1 || row < 0 || row > rowCount () || parent.isValid());
LOG4CPP_DEBUG_S ((*mainCat)) << "CurveNameList::removeRows"
<< " row=" << row
<< " count=" << count
<< " isRoot=" << (parent.isValid () ? "no" : "yes")
<< " skip=" << (skip ? "yes" : "no");
bool success = false;
beginRemoveRows (QModelIndex (),
row,
row + count - 1);
m_modelCurvesEntries.removeAt (row);
endRemoveRows ();
return success;
}
void CurveNameList::insertRow (int row,
const QString &curveCurrent,
const QString &curveOriginal,
unsigned int pointCount)
{
LOG4CPP_DEBUG_S ((*mainCat)) << "CurveNameList::insertRow"
<< " row=" <<row
<< " curveCurrent=" << curveCurrent.toLatin1().data()
<< " curveOriginal=" << curveOriginal.toLatin1().data()
<< " points=" << pointCount;
QStandardItem *item = new QStandardItem (curveCurrent);
QStandardItemModel::insertRow (row, item);
// Documentation for QAbstractItemModels says beginInsertRows/endInsertRows send off a rowsAboutToBeInserted signal
beginInsertRows (QModelIndex (),
row,
row);
m_currentCurveToOriginalCurve [curveCurrent] = curveOriginal;
m_originalCurveToPointCount [curveOriginal] = pointCount;
endInsertRows ();
}
FormatCoordsUnits::FormatCoordsUnits()
{
LOG4CPP_DEBUG_S ((*mainCat)) << "FormatCoordsUnits::FormatCoordsUnits";
}
QCursor DigitizeStateSegment::cursor(CmdMediator * /* cmdMediator */) const
{
LOG4CPP_DEBUG_S ((*mainCat)) << "DigitizeStateSegment::cursor";
return QCursor (Qt::ArrowCursor);
}
GridLine *GridLineFactory::createGridLine (double xFrom,
double yFrom,
double xTo,
double yTo,
const Transformation &transformation)
{
LOG4CPP_DEBUG_S ((*mainCat)) << "GridLineFactory::createGridLine"
<< " xFrom=" << xFrom
<< " yFrom=" << yFrom
<< " xTo=" << xTo
<< " yTo=" << yTo;
GridLine *gridLine = new GridLine ();
// Originally a complicated algorithm tried to intercept a straight line from (xFrom,yFrom) to (xTo,yTo). That did not work well since:
// 1) Calculations for mostly orthogonal cartesian coordinates worked less well with non-orthogonal polar coordinates
// 2) Ambiguity in polar coordinates between the shorter and longer paths between (theta0,radius) and (theta1,radius)
//
// Current algorithm breaks up the interval between (xMin,yMin) and (xMax,yMax) into many smaller pieces and stitches the
// desired pieces together. For straight lines in linear graphs this algorithm is very much overkill, but there is no significant
// penalty and this approach works in every situation
// Should give single-pixel resolution on most images, and 'good enough' resolution on extremely large images
const int NUM_STEPS = 1000;
bool stateSegmentIsActive = false;
QPointF posStartScreen (0, 0);
// Loop through steps. Final step i=NUM_STEPS does final processing if a segment is active
for (int i = 0; i <= NUM_STEPS; i++) {
double s = (double) i / (double) NUM_STEPS;
// Interpolate coordinates assuming normal linear scaling
double xGraph = (1.0 - s) * xFrom + s * xTo;
double yGraph = (1.0 - s) * yFrom + s * yTo;
// Replace interpolated coordinates using log scaling if appropriate, preserving the same ranges
if (m_modelCoords.coordScaleXTheta() == COORD_SCALE_LOG) {
xGraph = qExp ((1.0 - s) * qLn (xFrom) + s * qLn (xTo));
}
if (m_modelCoords.coordScaleYRadius() == COORD_SCALE_LOG) {
yGraph = qExp ((1.0 - s) * qLn (yFrom) + s * qLn (yTo));
}
QPointF pointScreen;
transformation.transformRawGraphToScreen (QPointF (xGraph, yGraph),
pointScreen);
double distanceToNearestPoint = minScreenDistanceFromPoints (pointScreen);
if ((distanceToNearestPoint < m_pointRadius) ||
(i == NUM_STEPS)) {
// Too close to point, so point is not included in side. Or this is the final iteration of the loop
if (stateSegmentIsActive) {
// State transition
finishActiveGridLine (posStartScreen,
pointScreen,
yFrom,
yTo,
transformation,
*gridLine);
stateSegmentIsActive = false;
}
} else {
// Outside point, so include point in side
if (!stateSegmentIsActive) {
// State transition
stateSegmentIsActive = true;
posStartScreen = pointScreen;
}
}
}
return gridLine;
}