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SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Objectcom.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.gui.QPainterPath
public class QPainterPath
The QPainterPath class provides a container for painting operations, enabling graphical shapes to be constructed and reused.
A painter path is an object composed of a number of graphical building blocks, such as rectangles, ellipses, lines, and curves. Building blocks can be joined in closed subpaths, for example as a rectangle or an ellipse. A closed path has coinciding start and end points. Or they can exist independently as unclosed subpaths, such as lines and curves.
A QPainterPath object can be used for filling, outlining, and clipping. To generate fillable outlines for a given painter path, use the QPainterPathStroker class. The main advantage of painter paths over normal drawing operations is that complex shapes only need to be created once; then they can be drawn many times using only calls to the QPainter::drawPath() function.
QPainterPath provides a collection of functions that can be used to obtain information about the path and its elements. In addition it is possible to reverse the order of the elements using the toReversed function. There are also several functions to convert this painter path object into a polygon representation.
A QPainterPath object can be constructed as an empty path, with a given start point, or as a copy of another QPainterPath object. Once created, lines and curves can be added to the path using the lineTo, arcTo, cubicTo and quadTo functions. The lines and curves stretch from the currentPosition to the position passed as argument.
The currentPosition of the QPainterPath object is always the end position of the last subpath that was added (or the initial start point). Use the moveTo function to move the currentPosition without adding a component. The moveTo function implicitly starts a new subpath, and closes the previous one. Another way of starting a new subpath is to call the closeSubpath function which closes the current path by adding a line from the currentPosition back to the path's start position. Note that the new path will have (0, 0) as its initial currentPosition.
QPainterPath class also provides several convenience functions to add closed subpaths to a painter path: addEllipse, addPath, addRect, addRegion and addText. The addPolygon function adds an unclosed subpath. In fact, these functions are all collections of moveTo, lineTo and cubicTo operations.
In addition, a path can be added to the current path using the connectPath function. But note that this function will connect the last element of the current path to the first element of given one by adding a line.
Below is a code snippet that shows how a QPainterPath object can be used:
![]() | QPainterPath path; path.addRect(20, 20, 60, 60); path.moveTo(0, 0); path.cubicTo(99, 0, 50, 50, 99, 99); path.cubicTo(0, 99, 50, 50, 0, 0); QPainter painter(this); painter.fillRect(0, 0, 100, 100, Qt::white); painter.setPen(QPen(QColor(79, 106, 25), 1, Qt::SolidLine, Qt::FlatCap, Qt::MiterJoin)); painter.setBrush(QColor(122, 163, 39)); painter.drawPath(path); |
The painter path is initially empty when constructed. We first add a rectangle, which is a closed subpath. Then we add two bezier curves which together form a closed subpath even though they are not closed individually. Finally we draw the entire path. The path is filled using the default fill rule, Qt::OddEvenFill. Qt provides two methods for filling paths:
![]() | ![]() |
Qt::OddEvenFill | Qt::WindingFill |
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See the Qt::FillRule documentation for the definition of the rules. A painter path's currently set fill rule can be retrieved using the fillRule function, and altered using the setFillRule function.
The QPainterPath class provides a collection of functions that returns information about the path and its elements.
The currentPosition function returns the end point of the last subpath that was added (or the initial start point). The elementAt function can be used to retrieve the various subpath elements, the number of elements can be retrieved using the elementCount function, and the isEmpty function tells whether this QPainterPath object contains any elements at all.
The controlPointRect function returns the rectangle containing all the points and control points in this path. This function is significantly faster to compute than the exact boundingRect which returns the bounding rectangle of this painter path with floating point precision.
Finally, QPainterPath provides the contains function which can be used to determine whether a given point or rectangle is inside the path, and the intersects function which determines if any of the points inside a given rectangle also are inside this path.
For compatibility reasons, it might be required to simplify the representation of a painter path: QPainterPath provides the toFillPolygon, toFillPolygons and toSubpathPolygons functions which convert the painter path into a polygon. The toFillPolygon returns the painter path as one single polygon, while the two latter functions return a list of polygons.
The toFillPolygons and toSubpathPolygons functions are provided because it is usually faster to draw several small polygons than to draw one large polygon, even though the total number of points drawn is the same. The difference between the two is the number of polygons they return: The toSubpathPolygons creates one polygon for each subpath regardless of intersecting subpaths (i.e. overlapping bounding rectangles), while the toFillPolygons functions creates only one polygon for overlapping subpaths.
The toFillPolygon and toFillPolygons functions first convert all the subpaths to polygons, then uses a rewinding technique to make sure that overlapping subpaths can be filled using the correct fill rule. Note that rewinding inserts additional lines in the polygon so the outline of the fill polygon does not match the outline of the path.
Qt provides the Painter Paths Example and the Vector Deformation Demo which are located in Qt's example and demo directories respectively.
The Painter Paths Example shows how painter paths can be used to build complex shapes for rendering and lets the user experiment with the filling and stroking. The Vector Deformation Demo shows how to use QPainterPath to draw text.
![]() | ![]() |
Painter Paths Example | Vector Deformation Demo |
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Paths Example
Nested Class Summary | |
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static class |
QPainterPath.ElementType
This enum describes the types of elements used to connect vertices in subpaths. |
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
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QSignalEmitter.Signal0, QSignalEmitter.Signal1<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I> |
Constructor Summary | |
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QPainterPath()
Constructs an empty QPainterPath object. |
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QPainterPath(QPainterPath other)
Creates a QPainterPath object that is a copy of the given other. |
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QPainterPath(QPointF startPoint)
Creates a QPainterPath object with the given startPoint as its current position. |
Method Summary | |
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void |
addEllipse(double x,
double y,
double w,
double h)
Creates an ellipse within the bounding rectangle defined by its top-left corner at (x, y), w and h, and adds it to the painter path as a closed subpath. |
void |
addEllipse(QRectF rect)
Creates an ellipse within the the specified rect and adds it to the painter path as a closed subpath. |
void |
addPath(QPainterPath path)
Adds the given path to this path as a closed subpath. |
void |
addPolygon(QPolygonF polygon)
Adds the given polygon to the path as an (unclosed) subpath. |
void |
addRect(double x,
double y,
double w,
double h)
Adds a rectangle at position (x, y), with the given w and h, as a closed subpath. |
void |
addRect(QRectF rect)
Adds the given rect to this path as a closed subpath. |
void |
addRegion(QRegion region)
Adds the given region to the path by adding each rectangle in the region as a separate closed subpath. |
void |
addRoundRect(double x,
double y,
double w,
double h,
int roundness)
Adds a rounded rectangle to the path, defined by the coordinates x and y with the specified w and h. |
void |
addRoundRect(double x,
double y,
double w,
double h,
int xRnd,
int yRnd)
Adds a rectangle with rounded corners to the path. |
void |
addRoundRect(QRectF rect,
int roundness)
Adds a rounded rectangle, rect, to the path. |
void |
addRoundRect(QRectF rect,
int xRnd,
int yRnd)
Adds a rectangle rect with rounded corners to the path. |
void |
addText(double x,
double y,
QFont f,
java.lang.String text)
Adds the given text to this path as a set of closed subpaths created from the f supplied. |
void |
addText(QPointF point,
QFont f,
java.lang.String text)
Adds the given text to this path as a set of closed subpaths created from the f supplied. |
double |
angleAtPercent(double t)
Returns the angle perpendicular to the slope of the path at the percentage t. |
void |
arcMoveTo(double x,
double y,
double w,
double h,
double angle)
Creates a move to that lies on the arc that occupies the QRectF(x, y, w, h) at angle. |
void |
arcMoveTo(QRectF rect,
double angle)
Creates a move to that lies on the arc that occupies the given rect at angle. |
void |
arcTo(double x,
double y,
double w,
double h,
double startAngle,
double arcLength)
Creates an arc that occupies the rectangle QRectF(x, y, w, h), beginning at the specified startAngle and extending arcLength degrees counter-clockwise. |
void |
arcTo(QRectF rect,
double startAngle,
double arcLength)
Creates an arc that occupies the given rect, beginning at the specified startAngle and extending arcLength degrees counter-clockwise. |
QRectF |
boundingRect()
Returns the bounding rectangle of this painter path as a rectangle with floating point precision. |
void |
closeSubpath()
Closes the current subpath by drawing a line to the beginning of the subpath, automatically starting a new path. |
void |
connectPath(QPainterPath path)
Connects the given path to this path by adding a line from the last element of this path to the first element of the given path. |
boolean |
contains(QPainterPath p)
Returns true if the given path p is contained within the current path. |
boolean |
contains(QPointF pt)
Returns true if the given pt is inside the path, otherwise returns false. |
boolean |
contains(QRectF rect)
Returns true if the given rect is inside the path, otherwise returns false. |
QRectF |
controlPointRect()
Returns the rectangle containing all the points and control points in this path. |
void |
cubicTo(double ctrlPt1x,
double ctrlPt1y,
double ctrlPt2x,
double ctrlPt2y,
double endPtx,
double endPty)
Adds a cubic Bezier curve between the current position and the end point (endPtx, endPty) with control points specified by (ctrlPt1x, ctrlPt1y) and (ctrlPt2x, ctrlPt2y). |
void |
cubicTo(QPointF ctrlPt1,
QPointF ctrlPt2,
QPointF endPt)
Adds a cubic Bezier curve between the current position and the given endPt using the control points specified by ctrlPt1, and ctrlPt2. |
QPointF |
currentPosition()
Returns the current position of the path. |
QPainterPath_Element |
elementAt(int i)
Returns the element at the given i in the painter path. |
int |
elementCount()
Returns the number of path elements in the painter path. |
boolean |
equals(java.lang.Object other)
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Qt.FillRule |
fillRule()
Returns the painter path's currently set fill rule. |
static QPainterPath |
fromNativePointer(QNativePointer nativePointer)
This function returns the QPainterPath instance pointed to by nativePointer |
QPainterPath |
intersected(QPainterPath r)
Returns a path which is the intersection of this path and r. |
boolean |
intersects(QPainterPath p)
Returns true if the current path intersects at any point the given path p. |
boolean |
intersects(QRectF rect)
Returns true if any point in the given rect intersects the path; otherwise returns false. |
boolean |
isEmpty()
Returns true if there are no elements in this path, otherwise returns false. |
double |
length()
Returns the length of the current path. |
void |
lineTo(double x,
double y)
Draws a line from the current position to the point (x, y). |
void |
lineTo(QPointF p)
Adds a straight line from the current position to the given p. |
void |
moveTo(double x,
double y)
Moves the current position to (x, y) and starts a new subpath, implicitly closing the previous path. |
void |
moveTo(QPointF p)
Moves the current point to the given p, implicitly starting a new subpath and closing the previous one. |
static QNativePointer |
nativePointerArray(QPainterPath[] array)
This function returns a QNativePointer that is pointing to the specified QPainterPath array. |
double |
percentAtLength(double t)
Returns percentage of the whole path at the specified length t. |
QPointF |
pointAtPercent(double t)
Returns the point at at the percentage t of the current path. |
void |
quadTo(double ctrlPtx,
double ctrlPty,
double endPtx,
double endPty)
Adds a quadratic Bezier curve between the current point and the endpoint (endPtx, endPty) with the control point specified by (ctrlPtx, ctrlPty). |
void |
quadTo(QPointF ctrlPt,
QPointF endPt)
Adds a quadratic Bezier curve between the current position and the given endPt with the control point specified by ctrlPt. |
void |
readFrom(QDataStream arg__1)
Reads a QPainterPath from arg__1. |
void |
setElementPositionAt(int i,
double x,
double y)
Sets the x and y coordinate of the element at index i to x and y. |
void |
setFillRule(Qt.FillRule fillRule)
Sets the fill rule of the painter path to the given fillRule. |
double |
slopeAtPercent(double t)
Returns the slope of the path at the percentage t. |
QPainterPath |
subtracted(QPainterPath r)
Returns a path which is r subtracted from this path. |
QPainterPath |
subtractedInverted(QPainterPath r)
Returns a path which is this path subtracted from r. |
QPolygonF |
toFillPolygon()
Equivalent to toFillPolygon(QMatrix()). |
QPolygonF |
toFillPolygon(QMatrix matrix)
This is an overloaded member function, provided for convenience. |
QPolygonF |
toFillPolygon(QTransform matrix)
Converts the path into a polygon using the QTransform matrix, and returns the polygon. |
java.util.List<QPolygonF> |
toFillPolygons()
This is an overloaded method provided for convenience. |
java.util.List<QPolygonF> |
toFillPolygons(QMatrix matrix)
Converts the path into a list of polygons using the QMatrix matrix, and returns the list. |
java.util.List<QPolygonF> |
toFillPolygons(QTransform matrix)
Converts the path into a list of polygons using the QTransform matrix, and returns the list. |
QPainterPath |
toReversed()
Creates and returns a reversed copy of the path. |
java.util.List<QPolygonF> |
toSubpathPolygons()
This is an overloaded method provided for convenience. |
java.util.List<QPolygonF> |
toSubpathPolygons(QMatrix matrix)
Converts the path into a list of polygons using the QMatrix matrix, and returns the list. |
java.util.List<QPolygonF> |
toSubpathPolygons(QTransform matrix)
Converts the path into a list of polygons using the QTransform matrix, and returns the list. |
QPainterPath |
united(QPainterPath r)
Returns a path which is the union of this path and r. |
void |
writeTo(QDataStream arg__1)
Writes thisQPainterPath to arg__1. |
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
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blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread |
Methods inherited from class java.lang.Object |
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clone, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Constructor Detail |
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public QPainterPath(QPainterPath other)
Creates a QPainterPath object that is a copy of the given other.
public QPainterPath(QPointF startPoint)
Creates a QPainterPath object with the given startPoint as its current position.
public QPainterPath()
Constructs an empty QPainterPath object.
Method Detail |
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public final void addEllipse(QRectF rect)
Creates an ellipse within the the specified rect and adds it to the painter path as a closed subpath.
The ellipse is composed of a clockwise curve, starting and finishing at zero degrees (the 3 o'clock position).
![]() | QLinearGradient myGradient; QPen myPen; QRectF boundingRectangle; QPainterPath myPath; myPath.addEllipse(boundingRectangle); QPainter painter(this); painter.setBrush(myGradient); painter.setPen(myPen); painter.drawPath(myPath); |
public final void addEllipse(double x, double y, double w, double h)
Creates an ellipse within the bounding rectangle defined by its top-left corner at (x, y), w and h, and adds it to the painter path as a closed subpath.
public final void addPath(QPainterPath path)
Adds the given path to this path as a closed subpath.
public final void addPolygon(QPolygonF polygon)
Adds the given polygon to the path as an (unclosed) subpath.
Note that the current position after the polygon has been added, is the last point in polygon. To draw a line back to the first point, use the closeSubpath function.
![]() | QLinearGradient myGradient; QPen myPen; QPolygonF myPolygon; QPainterPath myPath; myPath.addPolygon(myPolygon); QPainter painter(this); painter.setBrush(myGradient); painter.setPen(myPen); painter.drawPath(myPath); |
public final void addRect(double x, double y, double w, double h)
Adds a rectangle at position (x, y), with the given w and h, as a closed subpath.
public final void addRect(QRectF rect)
Adds the given rect to this path as a closed subpath.
The rect is added as a clockwise set of lines. The painter path's current position after the rect has been added is at the top-left corner of the rectangle.
![]() | QLinearGradient myGradient; QPen myPen; QRectF myRectangle; QPainterPath myPath; myPath.addRect(myRectangle); QPainter painter(this); painter.setBrush(myGradient); painter.setPen(myPen); painter.drawPath(myPath); |
public final void addRegion(QRegion region)
Adds the given region to the path by adding each rectangle in the region as a separate closed subpath.
public final void addRoundRect(QRectF rect, int roundness)
Adds a rounded rectangle, rect, to the path.
The roundness argument specifies uniform roundness for the rectangle. Vertical and horizontal roundness factors will be adjusted accordingly to act uniformly around both axes. Use this method if you want a rectangle equally rounded across both the X and Y axis.
public final void addRoundRect(QRectF rect, int xRnd, int yRnd)
Adds a rectangle rect with rounded corners to the path.
The xRnd and yRnd arguments specify how rounded the corners should be. 0 is angled corners, 99 is maximum roundedness.
A filled rectangle has a size of r.size(). A stroked rectangle has a size of r.size() plus the pen width.
public final void addRoundRect(double x, double y, double w, double h, int roundness)
Adds a rounded rectangle to the path, defined by the coordinates x and y with the specified w and h.
The roundness argument specifies uniform roundness for the rectangle. Vertical and horizontal roundness factors will be adjusted accordingly to act uniformly around both axes. Use this method if you want a rectangle equally rounded across both the X and Y axis.
public final void addRoundRect(double x, double y, double w, double h, int xRnd, int yRnd)
Adds a rectangle with rounded corners to the path. The rectangle is constructed from x, y, and the width and height w and h.
The xRnd and yRnd arguments specify how rounded the corners should be. 0 is angled corners, 99 is maximum roundedness.
public final void addText(QPointF point, QFont f, java.lang.String text)
Adds the given text to this path as a set of closed subpaths created from the f supplied. The subpaths are positioned so that the left end of the text's baseline lies at the specified point.
![]() | QLinearGradient myGradient; QPen myPen; QFont myFont; QPointF baseline(x, y); QPainterPath myPath; myPath.addText(baseline, myFont, tr("Qt")); QPainter painter(this); painter.setBrush(myGradient); painter.setPen(myPen); painter.drawPath(myPath); |
public final void addText(double x, double y, QFont f, java.lang.String text)
Adds the given text to this path as a set of closed subpaths created from the f supplied. The subpaths are positioned so that the left end of the text's baseline lies at the point specified by (x, y).
public final double angleAtPercent(double t)
Returns the angle perpendicular to the slope of the path at the percentage t. The angle is constructed with the reference frame of the horizontal (x) axis and the left side of the path (left as defined by the direction of the path). The argument t has to be between 0 and 1.
Note that similarly to the other percent methods, the percentage measurment is not linear with regards to the length if curves are present in the path. When curves are present the percentage argument is mapped to the t parameter of the Bezier equations.
public final void arcMoveTo(double x, double y, double w, double h, double angle)
Creates a move to that lies on the arc that occupies the QRectF(x, y, w, h) at angle.
public final void arcMoveTo(QRectF rect, double angle)
Creates a move to that lies on the arc that occupies the given rect at angle.
Angles are specified in degrees. Clockwise arcs can be specified using negative angles.
public final void arcTo(QRectF rect, double startAngle, double arcLength)
Creates an arc that occupies the given rect, beginning at the specified startAngle and extending arcLength degrees counter-clockwise.
Angles are specified in degrees. Clockwise arcs can be specified using negative angles.
Note that this function connects the starting point of the arc to the current position if they are not already connected. After the arc has been added, the current position is the last point in arc. To draw a line back to the first point, use the closeSubpath function.
![]() | QLinearGradient myGradient; QPen myPen; QPointF center, startPoint; QPainterPath myPath; myPath.moveTo(center); myPath.arcTo(boundingRect, startAngle, sweepLength); QPainter painter(this); painter.setBrush(myGradient); painter.setPen(myPen); painter.drawPath(myPath); |
public final void arcTo(double x, double y, double w, double h, double startAngle, double arcLength)
Creates an arc that occupies the rectangle QRectF(x, y, w, h), beginning at the specified startAngle and extending arcLength degrees counter-clockwise.
public final QRectF boundingRect()
Returns the bounding rectangle of this painter path as a rectangle with floating point precision.
public final void closeSubpath()
Closes the current subpath by drawing a line to the beginning of the subpath, automatically starting a new path. The current point of the new path is (0, 0).
If the subpath does not contain any elements, this function does nothing.
public final void connectPath(QPainterPath path)
Connects the given path to this path by adding a line from the last element of this path to the first element of the given path.
public final boolean contains(QRectF rect)
Returns true if the given rect is inside the path, otherwise returns false.
public final boolean contains(QPainterPath p)
Returns true if the given path p is contained within the current path.
public final boolean contains(QPointF pt)
Returns true if the given pt is inside the path, otherwise returns false.
public final QRectF controlPointRect()
Returns the rectangle containing all the points and control points in this path.
This function is significantly faster to compute than the exact boundingRect, and the returned rectangle is always a superset of the rectangle returned by boundingRect.
public final void cubicTo(QPointF ctrlPt1, QPointF ctrlPt2, QPointF endPt)
Adds a cubic Bezier curve between the current position and the given endPt using the control points specified by ctrlPt1, and ctrlPt2.
After the curve is added, the current position is updated to be at the end point of the curve.
![]() | QLinearGradient myGradient; QPen myPen; QPainterPath myPath; myPath.cubicto(c1, c2, endPoint); QPainter painter(this); painter.setBrush(myGradient); painter.setPen(myPen); painter.drawPath(myPath); |
public final void cubicTo(double ctrlPt1x, double ctrlPt1y, double ctrlPt2x, double ctrlPt2y, double endPtx, double endPty)
Adds a cubic Bezier curve between the current position and the end point (endPtx, endPty) with control points specified by (ctrlPt1x, ctrlPt1y) and (ctrlPt2x, ctrlPt2y).
public final QPointF currentPosition()
Returns the current position of the path.
public final QPainterPath_Element elementAt(int i)
Returns the element at the given i in the painter path.
public final int elementCount()
Returns the number of path elements in the painter path.
public final Qt.FillRule fillRule()
Returns the painter path's currently set fill rule.
public final QPainterPath intersected(QPainterPath r)
Returns a path which is the intersection of this path and r.
public final boolean intersects(QRectF rect)
Returns true if any point in the given rect intersects the path; otherwise returns false.
There is an intersection if any of the lines making up the rectangle crosses a part of the path or if any part of the rectangle overlaps with any area enclosed by the path. This function respects the current fillRule to determine what is considered inside the path.
public final boolean intersects(QPainterPath p)
Returns true if the current path intersects at any point the given path p. The intersection will return false if the path is fully contained within this path (use contains to check for that case).
public final boolean isEmpty()
Returns true if there are no elements in this path, otherwise returns false.
public final double length()
Returns the length of the current path.
public final void lineTo(QPointF p)
Adds a straight line from the current position to the given p. After the line is drawn, the current position is updated to be at the end point of the line.
public final void lineTo(double x, double y)
Draws a line from the current position to the point (x, y).
public final void moveTo(QPointF p)
Moves the current point to the given p, implicitly starting a new subpath and closing the previous one.
public final void moveTo(double x, double y)
Moves the current position to (x, y) and starts a new subpath, implicitly closing the previous path.
public final void writeTo(QDataStream arg__1)
public final void readFrom(QDataStream arg__1)
public final double percentAtLength(double t)
Returns percentage of the whole path at the specified length t.
Note that similarly to other percent methods, the percentage measurment is not linear with regards to the length, if curves are present in the path. When curves are present the percentage argument is mapped to the t parameter of the Bezier equations.
public final QPointF pointAtPercent(double t)
Returns the point at at the percentage t of the current path. The argument t has to be between 0 and 1.
Note that similarly to other percent methods, the percentage measurment is not linear with regards to the length, if curves are present in the path. When curves are present the percentage argument is mapped to the t parameter of the Bezier equations.
public final void quadTo(double ctrlPtx, double ctrlPty, double endPtx, double endPty)
Adds a quadratic Bezier curve between the current point and the endpoint (endPtx, endPty) with the control point specified by (ctrlPtx, ctrlPty).
public final void quadTo(QPointF ctrlPt, QPointF endPt)
Adds a quadratic Bezier curve between the current position and the given endPt with the control point specified by ctrlPt.
After the curve is added, the current point is updated to be at the end point of the curve.
public final void setElementPositionAt(int i, double x, double y)
Sets the x and y coordinate of the element at index i to x and y.
public final void setFillRule(Qt.FillRule fillRule)
Sets the fill rule of the painter path to the given fillRule. Qt provides two methods for filling paths:
![]() | ![]() |
Qt::OddEvenFill (default) | Qt::WindingFill |
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public final double slopeAtPercent(double t)
Returns the slope of the path at the percentage t. The argument t has to be between 0 and 1.
Note that similarly to other percent methods, the percentage measurment is not linear with regards to the length, if curves are present in the path. When curves are present the percentage argument is mapped to the t parameter of the Bezier equations.
public final QPainterPath subtracted(QPainterPath r)
Returns a path which is r subtracted from this path.
public final QPainterPath subtractedInverted(QPainterPath r)
Returns a path which is this path subtracted from r.
public final QPolygonF toFillPolygon()
Equivalent to toFillPolygon(QMatrix()).
public final QPolygonF toFillPolygon(QMatrix matrix)
public final QPolygonF toFillPolygon(QTransform matrix)
Converts the path into a polygon using the QTransform matrix, and returns the polygon.
The polygon is created by first converting all subpaths to polygons, then using a rewinding technique to make sure that overlapping subpaths can be filled using the correct fill rule.
Note that rewinding inserts addition lines in the polygon so the outline of the fill polygon does not match the outline of the path.
public final java.util.List<QPolygonF> toFillPolygons()
public final java.util.List<QPolygonF> toFillPolygons(QMatrix matrix)
The function differs from the toFillPolygon() function in that it creates several polygons. It is provided because it is usually faster to draw several small polygons than to draw one large polygon, even though the total number of points drawn is the same.
The toFillPolygons() function differs from the toSubpathPolygons() function in that it create only polygon for subpaths that have overlapping bounding rectangles.
Like the toFillPolygon() function, this function uses a rewinding technique to make sure that overlapping subpaths can be filled using the correct fill rule. Note that rewinding inserts addition lines in the polygons so the outline of the fill polygon does not match the outline of the path.
public final java.util.List<QPolygonF> toFillPolygons(QTransform matrix)
Converts the path into a list of polygons using the QTransform matrix, and returns the list.
The function differs from the toFillPolygon function in that it creates several polygons. It is provided because it is usually faster to draw several small polygons than to draw one large polygon, even though the total number of points drawn is the same.
The toFillPolygons function differs from the toSubpathPolygons function in that it create only polygon for subpaths that have overlapping bounding rectangles.
Like the toFillPolygon function, this function uses a rewinding technique to make sure that overlapping subpaths can be filled using the correct fill rule. Note that rewinding inserts addition lines in the polygons so the outline of the fill polygon does not match the outline of the path.
public final QPainterPath toReversed()
Creates and returns a reversed copy of the path.
It is the order of the elements that is reversed: If a QPainterPath is composed by calling the moveTo, lineTo and cubicTo functions in the specified order, the reversed copy is composed by calling cubicTo, lineTo and moveTo.
public final java.util.List<QPolygonF> toSubpathPolygons()
public final java.util.List<QPolygonF> toSubpathPolygons(QMatrix matrix)
This function creates one polygon for each subpath regardless of intersecting subpaths (i.e. overlapping bounding rectangles). To make sure that such overlapping subpaths are filled correctly, use the toFillPolygons() function instead.
public final java.util.List<QPolygonF> toSubpathPolygons(QTransform matrix)
Converts the path into a list of polygons using the QTransform matrix, and returns the list.
This function creates one polygon for each subpath regardless of intersecting subpaths (i.e. overlapping bounding rectangles). To make sure that such overlapping subpaths are filled correctly, use the toFillPolygons function instead.
public final QPainterPath united(QPainterPath r)
Returns a path which is the union of this path and r.
public static QPainterPath fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.public static QNativePointer nativePointerArray(QPainterPath[] array)
array
- the array that the returned pointer will point to.
public boolean equals(java.lang.Object other)
equals
in class java.lang.Object
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