Qpainter draw text. Returns true if position pos is a valid cursor position.

To measure needed offset for next string you can use @ painter. It lets me to align text as i wish (in the center of rectangle, for example). These examples show the most common techniques that are used when painting with Qt, from basic concepts such as drawing simple primitives to the use of transformations. It can draw everything from simple lines to complex shapes like pies and chords. Aug 30, 2013 · I use codes below to draw text in QGLWidget, but when the text is long and mixed Chinese(or Japanese) with English, then the text becomes upside down. bitmap) text_paint. There is a PySide. Anyone knows why? PS1: When I change QGLWidget to QWidget, everything is OK. Draw Text on QCustomPlot. setFont(QFont('Decorative', 10)) Here we define a pen and a font which are used to draw the text. Center text vertically when drawing with QPainter's drawText() 0. Didot 4. The text will then occupy a single line. QPainter::HighQualityAntialiasing); Then, in the paint event before drawing anything: This problem is also addressed in this question, and it seems that there is (yet) no consistent cross-platform solution. You can access this metric using the painters' fontMetrics() property, or by using the QFontMetrics(font, paintDevice) constructor. The printer is connected, installed and when I call qDebug() << printer. You forget to define the top left corner of the rectangle, you just passed the width and the def add_labels_internal(self, gl, render_state, draw_to_canvas, labels): ''' call to add a list of labels ''' text_paint = QPainter() if draw_to_canvas: text_paint. Final out put is always the color set in the QPainter and not the color in the shader. Here's how I set my flags: QPainter::SmoothPixmapTransform |. Here is my code. QWidget): def __init__ (self): super (Window, self There are several settings that you can customize to make QPainter: 999: draw according to your preferences: 1000: 1001 \list: 1002: 1003 \li font() is the font used for drawing text. drawText(pixmap. But in QT there is method for controlling alignment. painter->drawText(); If you wish to return to previous state call rotate again. Work out bounding rectangle using QFontMetrics to determine the size of each line. Renvoie la matrice de transformation du monde. Oct 5, 2021 · in the code snippet below) using QPainter 's drawText. Jun 17, 2016 · Draw rich text with QPainter. My code: painter->drawText(QRectF(0, 0, m_iSize, m_iSize), Qt::AlignCenter, m_sAlias + "\n" + m_sCode); where m_iSize is the size of the circle, m_sAlias is a short text like "R1" and m_sCode is another short text like "31". Drawing text to the screen Aug 12, 2017 · Center text vertically when drawing with QPainter's drawText() 10. Sep 5, 2015 · I want to do a fairly simple drawing where I write a two pieces of text above each other in the center of the circle. UPDATE: I want to emphasize that I need a solution which automatically recognizes the language/writing system of the text (left-to-right, such as English, versus right-to-left, such as Arabic) and aligns the text automatically. other this i have a text to long and is more difficult calculate the string lenght for make a "for cycle" and draw line to line Sep 3, 2019 · QPainter provides highly optimized functions to do most of the drawing GUI programs require. QPrinter. QtGui. This is the line I use: rect = metrics. Oct 25, 2014 · In my program i have open the image and draw the image in the pixmap and I also want to draw the text with drop shadow effect in the image can somebody please help me to draw the text with drop shadow effect using the drawText method or other options in the QPainter class. To control the current font on a QPainter you use setFont passing in a QFont instance. Drawing text Jul 17, 2019 · 1 Answer. Also you need to destroy QPainter before you use the pixmap to ensure that all changes will be written to the pixmap and to avoid memory leak. QPainter. drawText method, the resulting text is upside down. Transformations Example. QPicture. For example, if you want to rotate your text by 90 degrees, you would use the following code: painter1. 3k Views Sep 1, 2018 · テキストと画像を混在描画する. DrawText doesnt draw the text. This function takes an angle in degrees as its argument and rotates the painter's coordinate system by that amount. I am thinking of using QPainter to draw some text over my openGL 3D The QPainter class performs low-level painting on widgets and other paint devices. Are there any bugs in Qt I am unaware of? Aug 20, 2022 · So it must work for both directions automatically depending on the text. I need the text to fit in a given rectangle. QtGui import QPainterPath. I saw that if I draw directly using qpdfwriter the text looks good. To get the text to wrap use this: painter. 이 사각형을 drawRect ()와 drawText ()에 입력함으로써 사각형을 그리거나 텍스트가 표시될 영역을 지정했습니다. 10. It works, however the problem is that on some digits the result is cut off on the right side, and it should not be Jun 2, 2013 · I draw in my Qt program on a QPainter the text and various elements round it. text) The drawText method draws text on the window. Oct 18, 2023 · Drawing is used, when we want to change or enhance an existing widget. GlobalColor. However, since my code is part of a class library, there is no QApplication I could use in order to write in the image. QPainter object. You can fill ellipses by setting QBrush just as for filling rectangles, the same features for style and colour are available. And if I removed all the text drawing， the visible blank disappears. width(yourText); @ Just make sure you call that with the right font set first (the one you use for the text you want to skip). 텍스트가 표시될 위치를 조절할 수 있습니다. Qt will use the font with the specified attributes, or if no matching font exists, Qt will use the void QPainter:: drawText (const QRectF & rectangle , const QString & text , const QTextOption & option = QTextOption()) 这是重载函数。 绘制给定 text 在 rectangle 指定，使用 option 以控件其位置、方向及取向。 Jun 16, 2016 · The stages required are: Split text into lines. In my opinion, the correct approach is to clear the area before drawing new lines. Hot Network Questions Print all correct parenthesis sequences Sep 17, 2012 · I want to design a new QIcon and want it to look like a fixed text with a rounded rectangle around it. Jan 15, 2018 · Qt5. PS2: My Qt version is 4. 6. Example 2: font. Here are a few examples of how drawText can be used along with brief descriptions: 1. 3. Or if we are creating a custom widget from scratch. Create a QPainter object. main. e. bool QTextLayout:: isValidCursorPosition (int pos) const. label_2. drawText(event. The rect method of the paint event returns the rectangle that needs to be updated. boundingRect(rect, Qt. painter = QPainter(self) Mar 9, 2024 · Draw each character using the calculated texture coordinates and vertex positions; In this article, we have explored how to render text, numbers, and characters in OpenGL using the Qt framework. It also looks like QGraphicsTextItem is not much faster, as shown in the following Jan 16, 2016 · When you're drawing text on a QPaintDevice (in your case a QImage), the painter uses a font metric based on that paint devices' resolution. setRenderHints(QPainter. Renvoie true si hint est activé ; sinon renvoie false. QPainter not active. void QPainter:: drawText ( const QPoint & position, const Mar 26, 2018 · 0. It is also looks ugly in Qt OpenGL/2dpainting samples. AlignCenter, self. And here's the code that generates the system tray icon. When you get the size through the paperSize() method you are asking for it in QPrinter. Figure: Drawing text PyQt5 draw points Jan 22, 2020 · I find out an answer with the help of this thread PySide6 app crashes when using QPainter. qp. drawText(QRect(100, 100, 200, 200), Qt::TextWordWrap, "line\nline2", &r); QPainter can also draw aligned text and pixmaps. Text drawing is done using PySide. fill(Qt. You shall pass the QPixmap to the QPainter in the constructor or in the begin function: // Then you shall choose one of the followings: So if you want to define the alignment you need to pass a rectangle in which you want to draw your text. Affine The result is an aliased text in the image (this is on a 4K monitor). Apr 27, 2015 · You may use supported Qt HTML subset to format your text. Here is an example of how to draw text using QPainter in C++: c++ #include <QApplication Jun 4, 2012 · 3. cpp Use the QPainter::drawText() overload that takes a rectangle instead if you want to draw multiple lines of text with the newline character, or if you want the text to be wrapped. For example, drawing "Hello World" where the "H" is green, "ello" is yellow, "World" is blue. TextFlag. For example, for. Sorted by: 1. Inch 2. | Phy | `-----´ The icon is supposed to scale without the "pixel-blocks" effect when painting on a QPainter that eventually has a scale transformation applied (for example when I paint into a widget that is part of a QGraphicsView with a scale applied on its scene). Example 1: flags |= Qt::TextWrapAnywhere; However this leaves me with jittery text that is not smooth. The QPainter class performs low-level painting on widgets and other paint devices. I have an image in uint8_t buffer and I am trying to use QImage as a wrapper to write text on the image. Oct 29, 2016 · Seg faults on the p. With the Qt. setPen(QColor(168, 34, 3)) qp. Note: The y-position is used as the baseline of the font. QFont类的对象可以对字体的颜色 Jul 30, 2018 · Another option is try use QGraphicsItem. This can be achieved either by using the autoFillBackground property as proposed by Stephen Chu, or by calling manually the QPainter::eraseRect() before drawing your lines in the QGraphWidget::paintEvent method. The example consists of two classes and a global enum: Qt's painting system is able to render vector graphics, images, and outline font-based text with sub-pixel accuracy using anti-aliasing to improve rendering quality. ¶. Cette fonction a été introduite dans Qt 4. However text rendering is significantly better in QML controls which also use OpenGL backend. painter->rotate(-yourAngle); answered Jul 23, 2013 at 20:48. drawLine() So modified draw_something should look like this: def draw_something(self): # Setup canvas for drawing canvas = QPixmap(self. I'm not sure if this applies directly to pyQt, but on the c++ side render hints need to be set anytime the painting is scaled or it will look bad. All the painting methods go between begin and end methods. 该实例中，用到了字体设置类QFont用法。. The actual painting is delegated to the drawText method. Feb 2, 2017 · Make sense that you say. Does anybody know why? regards Oliver Oct 27, 2016 · Even we use FTGL to render texts. QPainter can also draw aligned text and pixmaps. Oct 5, 2014 · painter. In order to rotate your text (and any other drawable object) drawn by painter just call. Another issue is that I dont want the text for coordinates values resize with zooming, but I havent been able to achieve this. printerName(); I get the correct name of the printer that should be used. Mar 1, 2017 · painter. 1. Internallly to draw some text on in I used: Qt Code: Switch view. 0. When I draw text on either Qpixmap, QImage or QPrinter, the letters look blurred when I use drawtext with QPainter. For the reason, I'm guessing: As QPaintDevices are usually double buffered in QT4, QPainter::end() might be where the image is transferred to the graphic memory. QFont fnt; Oct 7, 2019 · The best approach I found is to use painter. Mateusz Andrzejewski. TextWordWrapenter. Also from the Qt docs: boundingRect() returns a rectangle describing the pixels this string will cover whereas width() returns May 19, 2014 · Draw rich text with QPainter. drawText(). See full list on doc. end(); return a. Qt will use the font with the specified attributes, or if no matching font exists, Qt will use the closest matching installed font. In a Unicode context some positions in the text are not valid cursor positions, because the position is inside a Unicode surrogate or a grapheme cluster. Jul 4, 2023 · First of all, import the module: from PyQt5. AlignCenter we align the text in both dimensions. DevicePixel so the obtained width is different from the width in Jun 5, 2019 · Drawing an ellipse using Point & radius. Can't we use shaders to do changes to the QPainter drawText function output ? qt. Jul 10, 2014 · You can draw on a pixmap in any function, but you need to show the result in the widget paint event. I can't use QGraphcisTextItem because I want my item to have different fonts. -----. With this Aug 27, 2015 · Returns the bounding rectangle of the characters in the string specified by text. 0, OS is Ubuntu 12. Sep 23, 2013 · Is there any way to draw an image on QPainter center aligned? I see QPainter::drawText gives us this provision but drawImage does not. Many thanks everybody. 텍스트 그리기1. Set the pen color. The drawing is done within the paintEvent method. Jun 5, 2021 · Drawing an ellipse using Point & radius. Finally, we'll take a brief tour through the QPainter text drawing methods. Note that the bounding rect only provides the width of drawn text, the width() function provides the width of trailing spaces as well. Jul 15, 2011 · I want to draw text labels on QOpenGLWidget. See also draw() and QPainter::drawGlyphRun(). I want it to be printed center aligned. 3. Here's a screenshot of my system tray (compare the date/time with "Hello world"). Paint Tools. When drawing text, the font is specified using the QFont class. painter. So I need to know the bounding box that each character had when being drawn. QPainter::drawText is designed for plain text without formatting, and it works much faster. rotate (90); Jul 23, 2013 · 4. Text in graphicsView in Qt. 위 예제에서는 우선 QRect 클래스를 이용해서 사각형을 정의합니다. drawText(drawRect, "Hello", QTextOption(Qt::AlignCenter)); painter. pointSizeF()*factor); painter. – Jan 10, 2023 · The QPainter class is responsible for all the low-level painting. Draw the text. size()) # Make new pixmap and set size from the size of the label canvas. You can create a pixmap and draw the text on it horizontally, then rotate the pixmap and draw it on the widget: QPainter provides highly optimized functions to do most of the drawing GUI programs require. The Transformations example shows how transformations influence the way that QPainter renders graphics primitives. void GIPlot ::drawText(QPainter* painter, const QPointF & pos, const QString & text, QFont* font, Qt ::Alignment align, QRectF* boundingRect) {. Voir aussi fillPath() et Drawing. To do the drawing, we use the drawing API provided by the PySide toolkit. Point units, but QPainter uses the coordinates in pixels, that is, QPrinter. cpp 2640 0x79361f6. user23346328. QPixmap pix(500,500); QPainter *paint = new QPainter(&pix); paint->setPen(QColor(255,34,255,255)); Nov 27, 2015 · QPainter how to draw text with different colors? Scheduled Pinned Locked Moved Unsolved General and Desktop 2 Posts 2 Posters 22. 9Creator代码编写一个红色字体的文本框，该文本框可以旋转90，通过该实例，进一步熟悉QPainter类和drawText ()函数的用法。. Normally, it draws in a “natural” coordinate system, but it can also do view and world transformation. drawText() command will draw. With this Mar 16, 2021 · I am writing an application in PyQt and I need to wrap the text that I am painting. I found what I was doing wrong. The pen's brush is a QBrush object used to fill strokes generated with the pen, i. 9绘制文字 (QPainter类，drawText函数)用法. import sys from PyQt5 import QtCore, QtGui, QtWidgets class Window (QtWidgets. ui. Loop over the string one word at a time, measuring it 'till it gets bigger than desired width (or you hit a line The QStaticText class can be used to mimic the behavior of QPainter::drawText () to a specific point with no boundaries, and also when QPainter::drawText () is called with a bounding rectangle. You can fill ellipses by setting QBrush just as for filling rectangles, the same features for style and color are available. I tried to use QPainter for this task, but had no success - text looks ugly and non antialiased. drawText call, giving the following stack trace, which ends with initializeDb: 1 initializeDb qfontdatabase. answered Feb 4 at 21:58. This is the gif that shows the blank. QPainter provides highly optimized functions to do most of the drawing GUI programs require. I'm working on PySide Jan 10, 2019 · At present I'm scaling the object to the height of the bounding box, but I'm not certain how to implement the width scaling because the width of the drawn text depends on the specific order of symbols (due to kerning). Jan 25, 2023 · One way to rotate text in QPainter is to use the rotate () function. Find the available painting options in the left sidebar and the canvas on the right. Draw text on image using Qt. setPointSizeF(font. Point 1. To draw text using QPainter, you can use the following steps: 1. You can also draw multi-line text in one go so it will take care of proper line spacing etc. qt. I use boundingRect method of QFontMetrics class to define the size and then QPainter. Jul 2, 2016 · Qt - QPainter. when the source size is small the image gets drawn on the left side of the page. release(); Here color is set to white and in shader simply set the color to red color. Pencil / Draw – Select the brush size from 1x1px to 4x4 and pick a Jul 4, 2017 · Everything is fine until that point, but when I try to draw the actual coordinates, using QPainter. Unfortunately, no such function exists in (at least, in Qt 5. Antialiasing) u = 0 v = 0 line_height = 0 for label in labels: ascent = 0 descent = 0 measured_text_width = 0 height = 0 width The pen’s brush is a QBrush object used to fill strokes generated with the pen, i. The below code is part of a boost thread in which I want to write text unto each image as it iterates through the function. setFont(font); Example 3: QPainter p(&image); Jun 5, 2021 · Drawing an ellipse using Point & radius. const QTransform & QPainter::transform const. Oct 18, 2023 · Here we define a pen and a font which are used to draw the text. Is there any other way or workaround to write/burn/put text into an image (QImage) in Qt without instantiating QApplication? Jun 24, 2016 · It even enables a pop up menu for copying. 今回重要なのはascentというパラメータで、テキストを描画する際のベースラインから文字の最上部までの高さ Feb 4, 2024 · The drawText() function in PySide6's QPainter class allows us to draw text on a paint device, such as a QImage or a QPainter. transparent) # Set color self. AlignmentFlag. It is not necessary to implement a personalized QLabel, it is enough to set the background color through Qt Style Sheet, also do not use a layout if you want to establish a certain position. The attributes of the font that is actually used can be retrieved using the QFontInfo class. Set the font and brush for the painter. cpp 896 0x7930ed0. Qt 1. answered Jun 17, 2016 at 8:50. exec(); } However when I run it through the debugger I get a SIGSEGV Segmentation fault signal on the drawText method. Mar 14, 2012 · Hi all, i have the necessity to draw text on a multiple line for create something like a QTextEdit in the Designer but with alone drawtext() i can't do this. drawPicture() function that draws the contents of an entire PySide. Returns true if position pos is a valid cursor position. TextWordWrap, self. the QBrush class defines the fill pattern. The problem is that the text is not crisp, and is rather blurry (I have a HiDPI monitor if that's relevant). 8. However, for each of the different items, they can be of variable width and similarly names can Apr 18, 2016 · In the first example, you can think of QPainter::begin(this) being called in the constructor and QPainter::end() in the destructor. QPainter::fontMerticsという関数を使うとテキストを描画するための座標計算に使えるいろいろな情報を取得できます。. It can also draw aligned text and pixmaps. Using VS2019 Perfomance Profiling Tools， We can see drawText occupies about 30% ~ 50% cpu work. Qt will use the font with the specified attributes, or if no matching font exists, Qt will use the Sep 23, 2017 · QPainter类的drawText方法有如下重载，可以分成两类，一类是提供点坐标绘制文本，一类是提供方框绘制文本。区别在于提供点坐标进行绘制的时候，点是在文本的左下角。而提供矩形的时候，矩形的点是在文本的左上角，同时也是矩形的左上角。 Jan 15, 2015 · qpainter drawtext boundingRect problem. AssName[i]) As you can see, I just needed to add QT. Use it like the classic Paint program, but instead of pixels and colors add characters to the canvas. drawText(rectangle,Qt. As I write this post, I noticed that not only the text, but also the image itself (HighDPI version) is aliased. I guess you use QPainter::drawText to draw the texts. How do I set up a QPainter window when logical coordinates are small and fractional? 6. 1 2. Can I get somehow the sizes in pixels, knowing a text string and a font? Thanks. rect(), QtCore. bool QPainter::testRenderHint ( RenderHint hint ) const. If you need to draw formatted text, you should use QTextDocument::drawContents. QtTextEdit: text content not rendered to QPainter. Jan 21, 2024 · It can be used to draw text, shapes, images, and other graphics. The application allows the user to manipulate the rendering of a shape by changing the translation, rotation and scale of QPainter 's coordinate system. My view is initially scaled (1,-1). One of the challenges when drawing text on a rectangular area is to ensure that the text fits within the rectangle and is wrapped appropriately. Drawing Text with Default Font and Color: In this example, we create a QPainter object, set the color and font for the text, and then draw the text on the widget. drawText to draw. Apr 1, 2020 · painter->drawText(QRectF(0, 0, 100000, 100000), Qt::AlignLeft, m_text); painter->restore(); } } Here is an example heaviest stack trace from Xcode Instruments Time Profiler, where all of the time is taken up by QPainter::drawText calls like that one above. AlignCenter|Qt. end(); program. I did not add the text to any widgets. 本文章主要总结用Qt5. Using the specified alignment work out the position of each line relative to the other inside the bounding rectangle. cpp 2795 0x7936b5e. setPixmap(canvas) # Set Feb 4, 2024 · 0. I hope I can draw a colorful text. I have used drawLine () with no issues, but drawText () crashes the program. Voir aussi renderHints() et setRenderHint(). 5,578 11 69 133. 4. I want that same functionality in a graphics text item that I want to implement myself. However, I also need to display a colored rectangle around each character's bounding box. I'm using void QPainter::drawText(const QRectF &rectangle, const QString &text, const QTextOption &option = QTextOption() method to draw some text. TextWordWrap, text) I'm using QPainter to draw multiline text on QImage. Cicero 5. QPainter#drawText seg faults in initializeDb. SPlatten. Create a QPainter and a QPainterPath object inside the paintEvent () method: painter = QPainter() path = QPainterPath() Repeat the old steps of activating the painter, rendering hints for painter objects, and setting the pen and brush: Jun 29, 2020 · Draw rich text with QPainter. Is there some built in functionality for this kind of scaling? May 22, 2023 · QPainter provides highly optimized functions to do most of the drawing GUI programs require. With this Feb 3, 2015 · It will wrap text that doesn't fit for you. Fractional pixel size with Qt. May 4, 2015 · 5. By default, QPainter draws text anti-aliased. Qt - QPainter. The drawing code is placed between the begin and end methods of the QtGui. Oct 20, 2014 · Using QApplication, QPainter and drawText(), this works well. I need to get the sizes in pixels which will be occupied by this text. Draw the text using the painter. 04 64bit Nov 28, 2020 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand . qpainter drawText text direction and size. drawText(0,0,"Test"); painter. void QGraphWidget::paintEvent(QPaintEvent Draw text with ASCII and unicode characters with your mouse on the canvas. drawText ()에 텍스트 Jul 25, 2016 · Inside of my QGraphicsRectItem::paint(), I am trying to draw the name of the item within its rect(). This is especially important when drawing text on smaller rectangles or Detailed Description. The only other way I can think of to accomplish this is to have multiple text items, but I don't think that is the way to go. painter->rotate(yourAngle); before. qt drawing outlined text with QPainterPath. drawText function to draw within a QRect on the image canvas and adding Qt::AlignRight flag, this way it's all handled by the painter and will always be aligned to the same exact point. From the doc: Warning: When the paintdevice is a widget, QPainter can only be used inside a paintEvent() function or in a function called by paintEvent(); that is unless the Qt::WA_PaintOutsidePaintEvent widget attribute is set. When you need fine-grained positioning, PySide. 2. Pica 3. Drawing Text In a QGraphicsWidget::paint function. Nov 19, 2017 · Here are a few of the examples that I currently have, but to no extent can I get them to move fluently. DevicePixel 6. Text. 3 QFontDatabase::load qfontdatabase. 2 QFontDatabase::findFont qfontdatabase. Moreover, I must calculate the position where to draw at 3 times. For the time being, I call drawText 3 times and using different QPen to change color. By utilizing the power of Qt's `QPainter` class, we can easily draw text in both 3D and 2D rendering modes. If a bounding rectangle is not required, create a QStaticText object without setting a preferred text width. fontMetrics(). Hi, I design a QGraphicsItem derived class that is like a plot item. What I did was wrote a function that takes a string and breaks it up into multiple lines, breaking on spaces or \r or \n. If the painter: 1004: isActive(), you can retrieve information about the currently set: 1005 Mar 22, 2015 · I want to draw a rectangle with rounded corners (border radius same for all 4 corners) with a specific color filling the entire rectangle, and a separate border color (say border is 1 px wide). Apr 12, 2016 · I have recently switched from the QGLWidget to the new QOpenGlWidget, because the later one is missing the renderText() function. , I want to add the text bottom Sep 19, 2017 · QPrinter. Rich text to image in QT. boundingRect() tells you where a given PySide. begin(self. io Nov 24, 2020 · Now I find that, before the text and color shows up, the window is about 1 second visible blank. Now, i need to do the same thing, except i need to draw one part of text with some font and the other part with Feb 10, 2012 · I use QPainter to drawText on QPrinter; however, there is a problem. There is a library function: void QPainter::drawText(int x, int y, int width, int height, int flags, const QString & text, QRect * boundingRect = 0) Here the flags argument is a bitwise OR operator with void QPainter:: drawText (const QRectF & rectangle , const QString & text , const QTextOption & option = QTextOption()) 这是重载函数。 绘制给定 text 在 rectangle 指定，使用 option 以控制它的定位和取向。 So you should call addPixmap after you make changes. 15). rect(), Qt. If I disable high DPI support, the text in the image is better, especially antialiazed (this is on a FullHD Monitor). I have one source rect, target rect and an image. So, I will follow your advise, write directly on QPrinter or qpdfwriter. oc qr tv gw vo bq gy vb la mq