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Questions tagged [qpainterpath]

QPainterPath is a class from the Qt Toolkit which provides a container for painting operations, enabling graphical shapes to be constructed and reused.

Documentation can be found here (Qt4) and here (Qt5).

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QPainter takes much more time to draw thicker curves?

I am drawing a sine wave (as a test) to check the time it takes to draw a curve using either QPainter::drawPolyline() or QPainter::drawPath(). In either case, if I set the pen width to more than 1, then the time it takes to draw the sine wave…
Chaitanya
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Drawing Bezier curve with multiple off curve points in PyQt

I would like to draw a TrueType Font glyph with PyQt5 QPainterPath. Example glyph fragment: (data from Fonttools ttx )
ajlogo
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How to change QPainterPath color after clicking on QPushButton

I subclassed a QPushButton so that I was able to re-implement the paintEvent(QPaintEvent *paint) method also advised by the official documentation. Below is the sequence of operations: a) After I launch the application the button is below: b) This…
EsoMars
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PyQt drawing a QPixmap along QPainterPath

I want to draw patterns (preferable as QPixmap) along a QGraphicsPathItem inside my QGraphicsView. This should work similar to filling a QBrush with a texture by using QBrush.setTexture("example.png"). Is there a way to do this on a QPen? I couldn't…
bravestarr
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QPainterPath toFillPolygon() returns more points than the points used to draw the path itself

I have been trying to draw skeletal points of a human using 18 different joints. So, i decided to use QGraphicsPathItem. I could successfully generate the item which looks something like this: (pardon my drawing skills) To achieve this i…
MarKS
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A bad spatial partitioning using quadtree

I am working on a path planning algorithm for a mobile robot. I am trying to implement a quadtree algorithm to model the spatial information. Each node contains a boolean variable that is true if the quad intersects with the path. For a path like…
billyDev
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how enable widget moved when window size changed with paint event?

I am try to create a widget to animate a line, the when the windows size is changed, the animation always play the size. I know the PainterPath is always same, but i have no any simple idea to do? from PyQt5.QtGui import * from PyQt5.QtCore import…
jett chen
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Draw text around QPainterPath efficiently

The following code draws text around a QPainterPath: QString text = "Short text"; QPainterPath rawPath; // fill path ... while (...) { double percent = ...; double angle = rawPath.angleAtPercent(percent); QPointF point =…
Hyndrix
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Animate ellipses along QPainterPath

I have a bunch of ellipses that initially are lined on top of a path and should move along the QPainterPath. I have it working for the first ellipse but I can't figure out how to get the correct position for the other ellipses. Is there a way to…
user2246120
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QPainterPath stroke artifacts

I am putting together a QPainterPath with text, then I'm drawing it, first with QPainter::strokePath, then with QPainter::fillPath. However, the stroke exhibits artefacts, as shown in the image. Anything I am doing wrong/how to prevent this? Should…
Danol
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QPainterPath PyQt5 draw difficult figures

Hellow. How can i draw smth like figure on pic using the qpainter path ? Does anybody have some code examples?
V.Nosov
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QPainterPath union of shapes (single stroke)

I'm trying to create the union of two shapes with QPainterPath to draw a comic balloon: const int kb = 4; QRectF br = text_->boundingRect().adjusted(-kb, -kb, kb, kb); // anchor on bottom side qreal y = br.bottom(); qreal x = 0.5 * (br.left() -…
fferri
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how to clear memory from deleted object in c++?

I want to develop my own signal scope in C++. So I use qt for this purpose. I add a graphicsView and a push Button in ui. At connected method to push button I update the graphicsView(finally I'll pass this method to a thread). Each time that I press…
M.Hu
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How to draw triangle and rhombus shapes using QT

I need to draw triangle shape and rhombus shapes like this image.In this code which design triangle shape (figure 1) but I need to add this shape to text "TRI" . And I also need to implement this code to design rhombus shape like (figure 2). please…
Gamma
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QML : What is the equivalent of QPainterPath?

In order to convert one GUI interface written in C++ with the Qt libraries to QML, I've to find an alternative to QPainterPath in QML. Indeed, for now, a bunch of shapes are drawn in the GUI interface and the C++ code modifies the color of those…
Getter
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