QCPLabelPainterPrivate
Public Types | |
enum | AnchorMode { amRectangular, amSkewedUpright, amSkewedRotated } |
enum | AnchorReferenceType { artNormal, artTangent } |
enum | AnchorSide { asLeft, asRight, asTop, asBottom, asTopLeft, asTopRight, asBottomRight, asBottomLeft } |
Public Member Functions | |
QCPLabelPainterPrivate (QCustomPlot *parentPlot) | |
bool | abbreviateDecimalPowers () const |
AnchorMode | anchorMode () const |
QPointF | anchorReference () const |
AnchorReferenceType | anchorReferenceType () const |
AnchorSide | anchorSide () const |
int | cacheSize () const |
void | clearCache () |
QColor | color () const |
void | drawTickLabel (QCPPainter *painter, const QPointF &tickPos, const QString &text) |
QFont | font () const |
QChar | multiplicationSymbol () const |
int | padding () const |
double | rotation () const |
void | setAbbreviateDecimalPowers (bool enabled) |
void | setAnchorMode (AnchorMode mode) |
void | setAnchorReference (const QPointF &pixelPoint) |
void | setAnchorReferenceType (AnchorReferenceType type) |
void | setAnchorSide (AnchorSide side) |
void | setCacheSize (int labelCount) |
void | setColor (const QColor &color) |
void | setFont (const QFont &font) |
void | setMultiplicationSymbol (QChar symbol) |
void | setPadding (int padding) |
void | setRotation (double rotation) |
void | setSubstituteExponent (bool enabled) |
bool | substituteExponent () const |
Static Public Attributes | |
static const QChar | SymbolCross |
static const QChar | SymbolDot |
Protected Member Functions | |
void | analyzeFontMetrics () |
void | applyAnchorTransform (LabelData &labelData) const |
QByteArray | cacheKey (const QString &text, const QColor &color, double rotation, AnchorSide side) const |
CachedLabel * | createCachedLabel (const LabelData &labelData) const |
virtual void | drawLabelMaybeCached (QCPPainter *painter, const QFont &font, const QColor &color, const QPointF &pos, AnchorSide side, double rotation, const QString &text) |
void | drawText (QCPPainter *painter, const QPointF &pos, const LabelData &labelData) const |
virtual QByteArray | generateLabelParameterHash () const |
QPointF | getAnchorPos (const QPointF &tickPos) |
LabelData | getTickLabelData (const QFont &font, const QColor &color, double rotation, AnchorSide side, const QString &text) const |
AnchorSide | rotationCorrectedSide (AnchorSide side, double rotation) const |
AnchorSide | skewedAnchorSide (const QPointF &tickPos, double sideExpandHorz, double sideExpandVert) const |
Protected Attributes | |
bool | mAbbreviateDecimalPowers |
AnchorMode | mAnchorMode |
QPointF | mAnchorReference |
AnchorReferenceType | mAnchorReferenceType |
AnchorSide | mAnchorSide |
QRect | mAxisSelectionBox |
QColor | mColor |
QFont | mFont |
QCache< QString, CachedLabel > | mLabelCache |
QByteArray | mLabelParameterHash |
QRect | mLabelSelectionBox |
int | mLetterCapHeight |
int | mLetterDescent |
QChar | mMultiplicationSymbol |
int | mPadding |
QCustomPlot * | mParentPlot |
double | mRotation |
bool | mSubstituteExponent |
QRect | mTickLabelsSelectionBox |
Detailed Description
(Private)
This is a private class and not part of the public QCustomPlot interface.
Definition at line 1535 of file qcustomplot.h.
Member Enumeration Documentation
◆ AnchorMode
TODO
Definition at line 1542 of file qcustomplot.h.
◆ AnchorReferenceType
TODO
Definition at line 1551 of file qcustomplot.h.
◆ AnchorSide
TODO
Definition at line 1559 of file qcustomplot.h.
Constructor & Destructor Documentation
◆ QCPLabelPainterPrivate()
|
explicit |
Constructs a QCPLabelPainterPrivate instance. Make sure to not create a new instance on every redraw, to utilize the caching mechanisms.
the parentPlot does not take ownership of the label painter. Make sure to delete it appropriately.
Definition at line 5466 of file qcustomplot.cpp.
Member Function Documentation
◆ clearCache()
void QCPLabelPainterPrivate::clearCache | ( | ) |
Returns the size ("margin" in QCPAxisRect context, so measured perpendicular to the axis backbone direction) needed to fit the axis.
Clears the internal label cache. Upon the next draw, all labels will be created new. This method is called automatically if any parameters have changed that invalidate the cached labels, such as font, color, etc. Usually you won't need to call this method manually.
Definition at line 5621 of file qcustomplot.cpp.
◆ createCachedLabel()
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protected |
Simulates the steps done by placeTickLabel by calculating bounding boxes of the text label to be drawn, depending on number format etc. Since only the largest tick label is wanted for the margin calculation, the passed tickLabelsSize is only expanded, if it's currently set to a smaller width/height.
Definition at line 5939 of file qcustomplot.cpp.
◆ drawLabelMaybeCached()
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protectedvirtual |
Draws a single tick label with the provided painter, utilizing the internal label cache to significantly speed up drawing of labels that were drawn in previous calls. The tick label is always bound to an axis, the distance to the axis is controllable via distanceToAxis in pixels. The pixel position in the axis direction is passed in the position parameter. Hence for the bottom axis, position would indicate the horizontal pixel position (not coordinate), at which the label should be drawn.
In order to later draw the axis label in a place that doesn't overlap with the tick labels, the largest tick label size is needed. This is acquired by passing a tickLabelsSize to the drawTickLabel calls during the process of drawing all tick labels of one axis. In every call, tickLabelsSize is expanded, if the drawn label exceeds the value tickLabelsSize currently holds.
The label is drawn with the font and pen that are currently set on the painter. To draw superscripted powers, the font is temporarily made smaller by a fixed factor (see getTickLabelData).
Definition at line 5665 of file qcustomplot.cpp.
◆ drawText()
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protected |
This is a placeTickLabel helper function.
Draws the tick label specified in labelData with painter at the pixel positions x and y. This function is used by placeTickLabel to create new tick labels for the cache, or to directly draw the labels on the QCustomPlot surface when label caching is disabled, i.e. when QCP::phCacheLabels plotting hint is not set.
Definition at line 5767 of file qcustomplot.cpp.
◆ generateLabelParameterHash()
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protectedvirtual |
Returns a hash that allows uniquely identifying whether the label parameters have changed such that the cached labels must be refreshed (clearCache). It is used in draw. If the return value of this method hasn't changed since the last redraw, the respective label parameters haven't changed and cached labels may be used.
Definition at line 5633 of file qcustomplot.cpp.
◆ getTickLabelData()
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protected |
This is a placeTickLabel helper function.
Transforms the passed text and font to a tickLabelData structure that can then be further processed by getTickLabelDrawOffset and drawTickLabel. It splits the text into base and exponent if necessary (member substituteExponent) and calculates appropriate bounding boxes.
Definition at line 5819 of file qcustomplot.cpp.
The documentation for this class was generated from the following files:
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