QCPLineEnding
Public Types | |
enum | EndingStyle { esNone , esFlatArrow , esSpikeArrow , esLineArrow , esDisc , esSquare , esDiamond , esBar , esHalfBar , esSkewedBar } |
Public Member Functions | |
QCPLineEnding () | |
QCPLineEnding (EndingStyle style, double width=8, double length=10, bool inverted=false) | |
double | boundingDistance () const |
void | draw (QCPPainter *painter, const QCPVector2D &pos, const QCPVector2D &dir) const |
void | draw (QCPPainter *painter, const QCPVector2D &pos, double angle) const |
bool | inverted () const |
double | length () const |
double | realLength () const |
void | setInverted (bool inverted) |
void | setLength (double length) |
void | setStyle (EndingStyle style) |
void | setWidth (double width) |
EndingStyle | style () const |
double | width () const |
Protected Attributes | |
bool | mInverted |
double | mLength |
EndingStyle | mStyle |
double | mWidth |
Detailed Description
Handles the different ending decorations for line-like items.
For every ending a line-like item has, an instance of this class exists. For example, QCPItemLine has two endings which can be set with QCPItemLine::setHead and QCPItemLine::setTail.
The styles themselves are defined via the enum QCPLineEnding::EndingStyle. Most decorations can be modified regarding width and length, see setWidth and setLength. The direction of the ending decoration (e.g. direction an arrow is pointing) is controlled by the line-like item. For example, when both endings of a QCPItemLine are set to be arrows, they will point to opposite directions, e.g. "outward". This can be changed by setInverted, which would make the respective arrow point inward.
Note that due to the overloaded QCPLineEnding constructor, you may directly specify a QCPLineEnding::EndingStyle where actually a QCPLineEnding is expected, e.g.
Definition at line 1528 of file qcustomplot.h.
Member Enumeration Documentation
◆ EndingStyle
Defines the type of ending decoration for line-like items, e.g. an arrow.
The width and length of these decorations can be controlled with the functions setWidth and setLength. Some decorations like esDisc, esSquare, esDiamond and esBar only support a width, the length property is ignored.
- See also
- QCPItemLine::setHead, QCPItemLine::setTail, QCPItemCurve::setHead, QCPItemCurve::setTail, QCPAxis::setLowerEnding, QCPAxis::setUpperEnding
Enumerator | |
---|---|
esNone | No ending decoration. |
esFlatArrow | A filled arrow head with a straight/flat back (a triangle) |
esSpikeArrow | A filled arrow head with an indented back. |
esLineArrow | A non-filled arrow head with open back. |
esDisc | A filled circle. |
esSquare | A filled square. |
esDiamond | A filled diamond (45 degrees rotated square) |
esBar | A bar perpendicular to the line. |
esHalfBar | A bar perpendicular to the line, pointing out to only one side (to which side can be changed with setInverted) |
esSkewedBar | A bar that is skewed (skew controllable via setLength) |
Definition at line 1543 of file qcustomplot.h.
Constructor & Destructor Documentation
◆ QCPLineEnding() [1/2]
QCPLineEnding::QCPLineEnding | ( | ) |
Creates a QCPLineEnding instance with default values (style esNone).
Definition at line 5193 of file qcustomplot.cpp.
◆ QCPLineEnding() [2/2]
QCPLineEnding::QCPLineEnding | ( | QCPLineEnding::EndingStyle | style, |
double | width = 8, | ||
double | length = 10, | ||
bool | inverted = false ) |
Creates a QCPLineEnding instance with the specified values.
Definition at line 5204 of file qcustomplot.cpp.
Member Function Documentation
◆ boundingDistance()
double QCPLineEnding::boundingDistance | ( | ) | const |
Returns the maximum pixel radius the ending decoration might cover, starting from the position the decoration is drawn at (typically a line ending/QCPItemPosition of an item).
This is relevant for clipping. Only omit painting of the decoration when the position where the decoration is supposed to be drawn is farther away from the clipping rect than the returned distance.
Definition at line 5264 of file qcustomplot.cpp.
◆ draw() [1/2]
void QCPLineEnding::draw | ( | QCPPainter * | painter, |
const QCPVector2D & | pos, | ||
const QCPVector2D & | dir ) const |
Draws the line ending with the specified painter at the position pos. The direction of the line ending is controlled with dir.
Definition at line 5329 of file qcustomplot.cpp.
◆ draw() [2/2]
void QCPLineEnding::draw | ( | QCPPainter * | painter, |
const QCPVector2D & | pos, | ||
double | angle ) const |
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
Draws the line ending. The direction is controlled with the angle parameter in radians.
Definition at line 5450 of file qcustomplot.cpp.
◆ inverted()
|
inline |
Definition at line 1563 of file qcustomplot.h.
◆ length()
|
inline |
Definition at line 1562 of file qcustomplot.h.
◆ realLength()
double QCPLineEnding::realLength | ( | ) | const |
Starting from the origin of this line ending (which is style specific), returns the length covered by the line ending symbol, in backward direction.
For example, the esSpikeArrow has a shorter real length than a esFlatArrow, even if both have the same setLength value, because the spike arrow has an inward curved back, which reduces the length along its center axis (the drawing origin for arrows is at the tip).
This function is used for precise, style specific placement of line endings, for example in QCPAxes.
Definition at line 5299 of file qcustomplot.cpp.
◆ setInverted()
void QCPLineEnding::setInverted | ( | bool | inverted | ) |
Sets whether the ending decoration shall be inverted. For example, an arrow decoration will point inward when inverted is set to true.
Note that also the width direction is inverted. For symmetrical ending styles like arrows or discs, this doesn't make a difference. However, asymmetric styles like esHalfBar are affected by it, which can be used to control to which side the half bar points to.
Definition at line 5250 of file qcustomplot.cpp.
◆ setLength()
void QCPLineEnding::setLength | ( | double | length | ) |
Sets the length of the ending decoration, if the style supports it. On arrows, for example, the length defines the size in pointing direction.
- See also
- setWidth
Definition at line 5237 of file qcustomplot.cpp.
◆ setStyle()
void QCPLineEnding::setStyle | ( | QCPLineEnding::EndingStyle | style | ) |
Sets the style of the ending decoration.
Definition at line 5215 of file qcustomplot.cpp.
◆ setWidth()
void QCPLineEnding::setWidth | ( | double | width | ) |
Sets the width of the ending decoration, if the style supports it. On arrows, for example, the width defines the size perpendicular to the arrow's pointing direction.
- See also
- setLength
Definition at line 5226 of file qcustomplot.cpp.
◆ style()
|
inline |
Definition at line 1560 of file qcustomplot.h.
◆ width()
|
inline |
Definition at line 1561 of file qcustomplot.h.
Member Data Documentation
◆ mInverted
|
protected |
Definition at line 1581 of file qcustomplot.h.
◆ mLength
|
protected |
Definition at line 1580 of file qcustomplot.h.
◆ mStyle
|
protected |
Definition at line 1579 of file qcustomplot.h.
◆ mWidth
|
protected |
Definition at line 1580 of file qcustomplot.h.
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