QPainterPath¶
The QPainterPath
class provides a container for painting operations, enabling graphical shapes to be constructed and reused. More…
Synopsis¶
Functions¶
def
__add__
(other)def
__and__
(other)def
__eq__
(other)def
__iadd__
(other)def
__iand__
(other)def
__ior__
(other)def
__isub__
(other)def
__mul__
(m)def
__ne__
(other)def
__or__
(other)def
__sub__
(other)def
addEllipse
(center, rx, ry)def
addEllipse
(rect)def
addEllipse
(x, y, w, h)def
addPath
(path)def
addPolygon
(polygon)def
addRect
(rect)def
addRect
(x, y, w, h)def
addRegion
(region)def
addRoundedRect
(rect, xRadius, yRadius[, mode=Qt.AbsoluteSize])def
addRoundedRect
(x, y, w, h, xRadius, yRadius[, mode=Qt.AbsoluteSize])def
addText
(point, f, text)def
addText
(x, y, f, text)def
angleAtPercent
(t)def
arcMoveTo
(rect, angle)def
arcMoveTo
(x, y, w, h, angle)def
arcTo
(rect, startAngle, arcLength)def
arcTo
(x, y, w, h, startAngle, arcLength)def
boundingRect
()def
capacity
()def
clear
()def
closeSubpath
()def
connectPath
(path)def
contains
(p)def
contains
(pt)def
contains
(rect)def
controlPointRect
()def
cubicTo
(ctrlPt1, ctrlPt2, endPt)def
cubicTo
(ctrlPt1x, ctrlPt1y, ctrlPt2x, ctrlPt2y, endPtx, endPty)def
currentPosition
()def
elementAt
(i)def
elementCount
()def
fillRule
()def
intersected
(r)def
intersects
(p)def
intersects
(rect)def
isEmpty
()def
length
()def
lineTo
(p)def
lineTo
(x, y)def
moveTo
(p)def
moveTo
(x, y)def
percentAtLength
(t)def
pointAtPercent
(t)def
quadTo
(ctrlPt, endPt)def
quadTo
(ctrlPtx, ctrlPty, endPtx, endPty)def
reserve
(size)def
setElementPositionAt
(i, x, y)def
setFillRule
(fillRule)def
simplified
()def
slopeAtPercent
(t)def
subtracted
(r)def
swap
(other)def
toFillPolygon
([matrix=QTransform()])def
toFillPolygons
([matrix=QTransform()])def
toReversed
()def
toSubpathPolygons
([matrix=QTransform()])def
translate
(dx, dy)def
translate
(offset)def
translated
(dx, dy)def
translated
(offset)def
united
(r)
Detailed Description¶
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 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.
Composing a QPainterPath¶
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:
path = QPainterPath() 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) painter = QPainter(self) 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, OddEvenFill
. Qt provides two methods for filling paths:
OddEvenFill
WindingFill
See the 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.
QPainterPath Information¶
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.
QPainterPath Conversion¶
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.
Examples¶
Qt provides the Painter Paths Example and the Vector Deformation example which are located in Qt’s example directory.
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 Example shows how to use QPainterPath
to draw text.
- class PySide6.QtGui.QPainterPath¶
PySide6.QtGui.QPainterPath(other)
PySide6.QtGui.QPainterPath(startPoint)
- Parameters
other –
PySide6.QtGui.QPainterPath
startPoint –
PySide6.QtCore.QPointF
Constructs an empty QPainterPath
object.
Creates a QPainterPath
object that is a copy of the given path
.
See also
operator=()
Creates a QPainterPath
object with the given startPoint
as its current position.
- PySide6.QtGui.QPainterPath.ElementType¶
This enum describes the types of elements used to connect vertices in subpaths.
Note that elements added as closed subpaths using the addEllipse()
, addPath()
, addPolygon()
, addRect()
, addRegion()
and addText()
convenience functions, is actually added to the path as a collection of separate elements using the moveTo()
, lineTo()
and cubicTo()
functions.
- PySide6.QtGui.QPainterPath.addEllipse(center, rx, ry)¶
- Parameters
center –
PySide6.QtCore.QPointF
rx – float
ry – float
This is an overloaded function.
Creates an ellipse positioned at center
with radii rx
and ry
, and adds it to the painter path as a closed subpath.
- PySide6.QtGui.QPainterPath.addEllipse(x, y, w, h)
- Parameters
x – float
y – float
w – float
h – float
This is an overloaded function.
Creates an ellipse within the bounding rectangle defined by its top-left corner at (x
, y
), width
and height
, and adds it to the painter path as a closed subpath.
- PySide6.QtGui.QPainterPath.addEllipse(rect)
- Parameters
rect –
PySide6.QtCore.QRectF
Creates an ellipse within the specified boundingRectangle
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).
myGradient = QLinearGradient() myPen = QPen() boundingRectangle = QRectF() myPath = QPainterPath() myPath.addEllipse(boundingRectangle) painter = QPainter(self) painter.setBrush(myGradient) painter.setPen(myPen) painter.drawPath(myPath)See also
arcTo()
drawEllipse()
Composing a QPainterPath
- PySide6.QtGui.QPainterPath.addPath(path)¶
- Parameters
path –
PySide6.QtGui.QPainterPath
Adds the given path
to this path as a closed subpath.
See also
connectPath()
Composing a QPainterPath
- PySide6.QtGui.QPainterPath.addPolygon(polygon)¶
- Parameters
polygon –
PySide6.QtGui.QPolygonF
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.
myGradient = QLinearGradient() myPen = QPen() myPolygon = QPolygonF() myPath = QPainterPath() myPath.addPolygon(myPolygon) painter = QPainter(self) painter.setBrush(myGradient) painter.setPen(myPen) painter.drawPath(myPath)See also
lineTo()
Composing a QPainterPath
- PySide6.QtGui.QPainterPath.addRect(rect)¶
- Parameters
rect –
PySide6.QtCore.QRectF
Adds the given rectangle
to this path as a closed subpath.
The rectangle
is added as a clockwise set of lines. The painter path’s current position after the rectangle
has been added is at the top-left corner of the rectangle.
myGradient = QLinearGradient() myPen = QPen() myRectangle = QRectF() myPath = QPainterPath() myPath.addRect(myRectangle) painter = QPainter(self) painter.setBrush(myGradient) painter.setPen(myPen) painter.drawPath(myPath)See also
addRegion()
lineTo()
Composing a QPainterPath
- PySide6.QtGui.QPainterPath.addRect(x, y, w, h)
- Parameters
x – float
y – float
w – float
h – float
This is an overloaded function.
Adds a rectangle at position (x
, y
), with the given width
and height
, as a closed subpath.
- PySide6.QtGui.QPainterPath.addRegion(region)¶
- Parameters
region –
PySide6.QtGui.QRegion
Adds the given region
to the path by adding each rectangle in the region as a separate closed subpath.
See also
addRect()
Composing a QPainterPath
- PySide6.QtGui.QPainterPath.addRoundedRect(rect, xRadius, yRadius[, mode=Qt.AbsoluteSize])¶
- Parameters
rect –
PySide6.QtCore.QRectF
xRadius – float
yRadius – float
mode –
SizeMode
Adds the given rectangle rect
with rounded corners to the path.
The xRadius
and yRadius
arguments specify the radii of the ellipses defining the corners of the rounded rectangle. When mode
is RelativeSize
, xRadius
and yRadius
are specified in percentage of half the rectangle’s width and height respectively, and should be in the range 0.0 to 100.0.
See also
- PySide6.QtGui.QPainterPath.addRoundedRect(x, y, w, h, xRadius, yRadius[, mode=Qt.AbsoluteSize])
- Parameters
x – float
y – float
w – float
h – float
xRadius – float
yRadius – float
mode –
SizeMode
This is an overloaded function.
Adds the given rectangle x
, y
, w
, h
with rounded corners to the path.
- PySide6.QtGui.QPainterPath.addText(point, f, text)¶
- Parameters
point –
PySide6.QtCore.QPointF
text – str
Adds the given text
to this path as a set of closed subpaths created from the font
supplied. The subpaths are positioned so that the left end of the text’s baseline lies at the specified point
.
myGradient = QLinearGradient() myPen = QPen() myFont = QFont() baseline = QPointF(x, y) myPath = QPainterPath() myPath.addText(baseline, myFont, tr("Qt")) painter = QPainter(self) painter.setBrush(myGradient) painter.setPen(myPen) painter.drawPath(myPath)See also
drawText()
Composing a QPainterPath
- PySide6.QtGui.QPainterPath.addText(x, y, f, text)
- Parameters
x – float
y – float
text – str
This is an overloaded function.
Adds the given text
to this path as a set of closed subpaths created from the font
supplied. The subpaths are positioned so that the left end of the text’s baseline lies at the point specified by (x
, y
).
- PySide6.QtGui.QPainterPath.angleAtPercent(t)¶
- Parameters
t – float
- Return type
float
Returns the angle of the path tangent at the percentage t
. The argument t
has to be between 0 and 1.
Positive values for the angles mean counter-clockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o’clock position.
Note that similarly to the other percent methods, the percentage measurement 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.
- PySide6.QtGui.QPainterPath.arcMoveTo(rect, angle)¶
- Parameters
rect –
PySide6.QtCore.QRectF
angle – float
Creates a move to that lies on the arc that occupies the given rectangle
at angle
.
Angles are specified in degrees. Clockwise arcs can be specified using negative angles.
- PySide6.QtGui.QPainterPath.arcMoveTo(x, y, w, h, angle)
- Parameters
x – float
y – float
w – float
h – float
angle – float
This is an overloaded function.
Creates a move to that lies on the arc that occupies the QRectF
(x
, y
, width
, height
) at angle
.
- PySide6.QtGui.QPainterPath.arcTo(rect, startAngle, arcLength)¶
- Parameters
rect –
PySide6.QtCore.QRectF
startAngle – float
arcLength – float
Creates an arc that occupies the given rectangle
, beginning at the specified startAngle
and extending sweepLength
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.
myPath = QPainterPath() myPath.moveTo(center) myPath.arcTo(boundingRect, startAngle, sweepLength) painter = QPainter(self) painter.setBrush(myGradient) painter.setPen(myPen) painter.drawPath(myPath)See also
arcMoveTo()
addEllipse()
drawArc()
drawPie()
Composing a QPainterPath
- PySide6.QtGui.QPainterPath.arcTo(x, y, w, h, startAngle, arcLength)
- Parameters
x – float
y – float
w – float
h – float
startAngle – float
arcLength – float
This is an overloaded function.
Creates an arc that occupies the rectangle QRectF
(x
, y
, width
, height
), beginning at the specified startAngle
and extending sweepLength
degrees counter-clockwise.
- PySide6.QtGui.QPainterPath.boundingRect()¶
- Return type
Returns the bounding rectangle of this painter path as a rectangle with floating point precision.
See also
- PySide6.QtGui.QPainterPath.capacity()¶
- Return type
int
Returns the number of elements allocated by the QPainterPath
.
- PySide6.QtGui.QPainterPath.clear()¶
Clears the path elements stored.
This allows the path to reuse previous memory allocations.
See also
- PySide6.QtGui.QPainterPath.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.
See also
moveTo()
Composing a QPainterPath
- PySide6.QtGui.QPainterPath.connectPath(path)¶
- Parameters
path –
PySide6.QtGui.QPainterPath
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.
See also
addPath()
Composing a QPainterPath
- PySide6.QtGui.QPainterPath.contains(p)¶
- Parameters
- Return type
bool
Returns true
if the given path p
is contained within the current path. Returns false
if any edges of the current path and p
intersect.
Set operations on paths will treat the paths as areas. Non-closed paths will be treated as implicitly closed.
See also
- PySide6.QtGui.QPainterPath.contains(pt)
- Parameters
- Return type
bool
Returns true
if the given point
is inside the path, otherwise returns false
.
See also
- PySide6.QtGui.QPainterPath.contains(rect)
- Parameters
rect –
PySide6.QtCore.QRectF
- Return type
bool
Returns true
if the given rectangle
is inside the path, otherwise returns false
.
- PySide6.QtGui.QPainterPath.controlPointRect()¶
- Return type
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()
.
See also
- PySide6.QtGui.QPainterPath.cubicTo(ctrlPt1, ctrlPt2, endPt)¶
- Parameters
ctrlPt1 –
PySide6.QtCore.QPointF
ctrlPt2 –
PySide6.QtCore.QPointF
endPt –
PySide6.QtCore.QPointF
Adds a cubic Bezier curve between the current position and the given endPoint
using the control points specified by c1
, and c2
.
After the curve is added, the current position is updated to be at the end point of the curve.
myGradient = QLinearGradient() myPen = QPen() myPath = QPainterPath() myPath.cubicTo(c1, c2, endPoint) painter = QPainter(self) painter.setBrush(myGradient) painter.setPen(myPen) painter.drawPath(myPath)See also
quadTo()
Composing a QPainterPath
- PySide6.QtGui.QPainterPath.cubicTo(ctrlPt1x, ctrlPt1y, ctrlPt2x, ctrlPt2y, endPtx, endPty)
- Parameters
ctrlPt1x – float
ctrlPt1y – float
ctrlPt2x – float
ctrlPt2y – float
endPtx – float
endPty – float
This is an overloaded function.
Adds a cubic Bezier curve between the current position and the end point (endPointX
, endPointY
) with control points specified by (c1X
, c1Y
) and (c2X
, c2Y
).
- PySide6.QtGui.QPainterPath.currentPosition()¶
- Return type
Returns the current position of the path.
- PySide6.QtGui.QPainterPath.elementAt(i)¶
- Parameters
i – int
- Return type
Returns the element at the given index
in the painter path.
See also
ElementType
elementCount()
isEmpty()
- PySide6.QtGui.QPainterPath.elementCount()¶
- Return type
int
Returns the number of path elements in the painter path.
See also
ElementType
elementAt()
isEmpty()
Returns the painter path’s currently set fill rule.
See also
- PySide6.QtGui.QPainterPath.intersected(r)¶
- Parameters
- Return type
Returns a path which is the intersection of this path’s fill area and p
's fill area. Bezier curves may be flattened to line segments due to numerical instability of doing bezier curve intersections.
- PySide6.QtGui.QPainterPath.intersects(rect)¶
- Parameters
rect –
PySide6.QtCore.QRectF
- Return type
bool
Returns true
if any point in the given rectangle
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.
See also
- PySide6.QtGui.QPainterPath.intersects(p)
- Parameters
- Return type
bool
Returns true
if the current path intersects at any point the given path p
. Also returns true
if the current path contains or is contained by any part of p
.
Set operations on paths will treat the paths as areas. Non-closed paths will be treated as implicitly closed.
See also
- PySide6.QtGui.QPainterPath.isEmpty()¶
- Return type
bool
Returns true
if either there are no elements in this path, or if the only element is a MoveToElement
; otherwise returns false
.
See also
- PySide6.QtGui.QPainterPath.length()¶
- Return type
float
Returns the length of the current path.
- PySide6.QtGui.QPainterPath.lineTo(p)¶
- Parameters
Adds a straight line from the current position to the given endPoint
. After the line is drawn, the current position is updated to be at the end point of the line.
See also
addPolygon()
addRect()
Composing a QPainterPath
- PySide6.QtGui.QPainterPath.lineTo(x, y)
- Parameters
x – float
y – float
This is an overloaded function.
Draws a line from the current position to the point (x
, y
).
- PySide6.QtGui.QPainterPath.moveTo(p)¶
- Parameters
Moves the current point to the given point
, implicitly starting a new subpath and closing the previous one.
See also
closeSubpath()
Composing a QPainterPath
- PySide6.QtGui.QPainterPath.moveTo(x, y)
- Parameters
x – float
y – float
This is an overloaded function.
Moves the current position to (x
, y
) and starts a new subpath, implicitly closing the previous path.
- PySide6.QtGui.QPainterPath.__ne__(other)¶
- Parameters
other –
PySide6.QtGui.QPainterPath
- Return type
bool
Returns true
if this painter path differs from the given path
.
Note that comparing paths may involve a per element comparison which can be slow for complex paths.
See also
operator==()
- PySide6.QtGui.QPainterPath.__and__(other)¶
- Parameters
other –
PySide6.QtGui.QPainterPath
- Return type
- PySide6.QtGui.QPainterPath.__iand__(other)¶
- Parameters
other –
PySide6.QtGui.QPainterPath
- Return type
- PySide6.QtGui.QPainterPath.__mul__(m)¶
- Parameters
- Return type
- PySide6.QtGui.QPainterPath.__add__(other)¶
- Parameters
other –
PySide6.QtGui.QPainterPath
- Return type
Returns the union of this path and the other
path. This function is equivalent to operator|().
See also
united()
operator+=()
operator-()
- PySide6.QtGui.QPainterPath.__iadd__(other)¶
- Parameters
other –
PySide6.QtGui.QPainterPath
- Return type
Unites this path with other
, and returns a reference to this path. This is equivalent to operator|=().
See also
united()
operator+()
operator-=()
- PySide6.QtGui.QPainterPath.__sub__(other)¶
- Parameters
other –
PySide6.QtGui.QPainterPath
- Return type
Subtracts the other
path from a copy of this path, and returns the copy.
See also
subtracted()
operator-=()
operator+()
- PySide6.QtGui.QPainterPath.__isub__(other)¶
- Parameters
other –
PySide6.QtGui.QPainterPath
- Return type
Subtracts other
from this path, and returns a reference to this path.
See also
subtracted()
operator-()
operator+=()
- PySide6.QtGui.QPainterPath.__eq__(other)¶
- Parameters
other –
PySide6.QtGui.QPainterPath
- Return type
bool
Returns true
if this painterpath is equal to the given path
.
Note that comparing paths may involve a per element comparison which can be slow for complex paths.
See also
operator!=()
- PySide6.QtGui.QPainterPath.__or__(other)¶
- Parameters
other –
PySide6.QtGui.QPainterPath
- Return type
Returns the union of this path and the other
path.
See also
united()
operator|=()
intersected()
operator&()
- PySide6.QtGui.QPainterPath.__ior__(other)¶
- Parameters
other –
PySide6.QtGui.QPainterPath
- Return type
Unites this path with other
and returns a reference to this path.
See also
united()
operator|()
operator&=()
- PySide6.QtGui.QPainterPath.percentAtLength(t)¶
- Parameters
t – float
- Return type
float
Returns percentage of the whole path at the specified length len
.
Note that similarly to other percent methods, the percentage measurement 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.
- PySide6.QtGui.QPainterPath.pointAtPercent(t)¶
- Parameters
t – float
- Return type
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 measurement 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.
- PySide6.QtGui.QPainterPath.quadTo(ctrlPt, endPt)¶
- Parameters
ctrlPt –
PySide6.QtCore.QPointF
endPt –
PySide6.QtCore.QPointF
Adds a quadratic Bezier curve between the current position and the given endPoint
with the control point specified by c
.
After the curve is added, the current point is updated to be at the end point of the curve.
See also
cubicTo()
Composing a QPainterPath
- PySide6.QtGui.QPainterPath.quadTo(ctrlPtx, ctrlPty, endPtx, endPty)
- Parameters
ctrlPtx – float
ctrlPty – float
endPtx – float
endPty – float
This is an overloaded function.
Adds a quadratic Bezier curve between the current point and the endpoint (endPointX
, endPointY
) with the control point specified by (cx
, cy
).
- PySide6.QtGui.QPainterPath.reserve(size)¶
- Parameters
size – int
Reserves a given amount of elements in QPainterPath
‘s internal memory.
Attempts to allocate memory for at least size
elements.
See also
clear()
capacity()
reserve()
- PySide6.QtGui.QPainterPath.setElementPositionAt(i, x, y)¶
- Parameters
i – int
x – float
y – float
Sets the x and y coordinate of the element at index index
to x
and y
.
Sets the fill rule of the painter path to the given fillRule
. Qt provides two methods for filling paths:
OddEvenFill
(default)
WindingFill
See also
- PySide6.QtGui.QPainterPath.simplified()¶
- Return type
Returns a simplified version of this path. This implies merging all subpaths that intersect, and returning a path containing no intersecting edges. Consecutive parallel lines will also be merged. The simplified path will always use the default fill rule, OddEvenFill
. Bezier curves may be flattened to line segments due to numerical instability of doing bezier curve intersections.
- PySide6.QtGui.QPainterPath.slopeAtPercent(t)¶
- Parameters
t – float
- Return type
float
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 measurement 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.
- PySide6.QtGui.QPainterPath.subtracted(r)¶
- Parameters
- Return type
Returns a path which is p
's fill area subtracted from this path’s fill area.
Set operations on paths will treat the paths as areas. Non-closed paths will be treated as implicitly closed. Bezier curves may be flattened to line segments due to numerical instability of doing bezier curve intersections.
- PySide6.QtGui.QPainterPath.swap(other)¶
- Parameters
other –
PySide6.QtGui.QPainterPath
Swaps painter path other
with this painter path. This operation is very fast and never fails.
- PySide6.QtGui.QPainterPath.toFillPolygon([matrix=QTransform()])¶
- Parameters
matrix –
PySide6.QtGui.QTransform
- Return type
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.
See also
toSubpathPolygons()
toFillPolygons()
QPainterPath Conversion
- PySide6.QtGui.QPainterPath.toFillPolygons([matrix=QTransform()])¶
- Parameters
matrix –
PySide6.QtGui.QTransform
- Return type
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 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.
See also
toSubpathPolygons()
toFillPolygon()
QPainterPath Conversion
- PySide6.QtGui.QPainterPath.toReversed()¶
- Return type
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()
.
- PySide6.QtGui.QPainterPath.toSubpathPolygons([matrix=QTransform()])¶
- Parameters
matrix –
PySide6.QtGui.QTransform
- Return type
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.
See also
toFillPolygons()
toFillPolygon()
QPainterPath Conversion
- PySide6.QtGui.QPainterPath.translate(offset)¶
- Parameters
offset –
PySide6.QtCore.QPointF
This is an overloaded function.
Translates all elements in the path by the given offset
.
See also
- PySide6.QtGui.QPainterPath.translate(dx, dy)
- Parameters
dx – float
dy – float
Translates all elements in the path by (dx
, dy
).
See also
- PySide6.QtGui.QPainterPath.translated(offset)¶
- Parameters
offset –
PySide6.QtCore.QPointF
- Return type
This is an overloaded function.
Returns a copy of the path that is translated by the given offset
.
See also
- PySide6.QtGui.QPainterPath.translated(dx, dy)
- Parameters
dx – float
dy – float
- Return type
Returns a copy of the path that is translated by (dx
, dy
).
See also
- PySide6.QtGui.QPainterPath.united(r)¶
- Parameters
- Return type
Returns a path which is the union of this path’s fill area and p
's fill area.
Set operations on paths will treat the paths as areas. Non-closed paths will be treated as implicitly closed. Bezier curves may be flattened to line segments due to numerical instability of doing bezier curve intersections.
See also
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