QwtPlotOpenGLCanvas(3)

📦
version 6.3.0 · 2 versions
, in alpine 3.24

🦋 QwtPlotOpenGLCanvas(3) 🦋

okay bestie, welcome to the Library Functions Manual entry for QwtPlotOpenGLCanvas — the alternative canvas for a QwtPlot that's derived from QOpenGLWidget. slay ✨

🌸 NAME 🌸

QwtPlotOpenGLCanvas — An alternative canvas for a QwtPlot derived from QOpenGLWidget.

✨ SYNOPSIS ✨

#include <qwt_plot_opengl_canvas.h>

Inherits QOpenGLWidget, and QwtPlotAbstractGLCanvas.

💅 Public Slots

  • void replot () — repaint vibes, deets below.

🎀 Public Member Functions

  • QwtPlotOpenGLCanvas (QwtPlot *=NULL) — Constructor.
  • QwtPlotOpenGLCanvas (int samples, QwtPlot *=NULL) — Constructor.
  • virtual ~QwtPlotOpenGLCanvas () — Destructor.
  • virtual Q_INVOKABLE void invalidateBackingStore () override — Invalidate the internal backing store.
  • Q_INVOKABLE QPainterPath borderPath (const QRect &) const — the synopsis just drops the signature; full border-path deets are below.
  • virtual bool event (QEvent *) override — event handler; full deets below.

🌈 Public Member Functions inherited from QwtPlotAbstractGLCanvas

  • QwtPlotAbstractGLCanvas (QWidget *canvasWidget) — Constructor.
  • virtual ~QwtPlotAbstractGLCanvas () — Destructor.
  • void setPaintAttribute (PaintAttribute, bool on=true) — Changing the paint attributes.
  • bool testPaintAttribute (PaintAttribute) const
  • void setFrameStyle (int style)
  • int frameStyle () const
  • void setFrameShadow (QFrame::Shadow)
  • QFrame::Shadow frameShadow () const
  • void setFrameShape (QFrame::Shape)
  • QFrame::Shape frameShape () const
  • void setLineWidth (int)
  • int lineWidth () const
  • void setMidLineWidth (int)
  • int midLineWidth () const
  • int frameWidth () const
  • QRect frameRect () const

🫶 Public Member Functions inherited from QwtPlotAbstractCanvas

  • QwtPlotAbstractCanvas (QWidget *canvasWidget) — Constructor.
  • virtual ~QwtPlotAbstractCanvas () — Destructor.
  • QwtPlot * plot () — Return parent plot widget.
  • const QwtPlot * plot () const — Return parent plot widget.
  • void setFocusIndicator (FocusIndicator)
  • FocusIndicator focusIndicator () const
  • void setBorderRadius (double)
  • double borderRadius () const

🧚 Protected Member Functions

  • virtual void paintEvent (QPaintEvent *) override
  • virtual void initializeGL () override — No operation - reserved for some potential use in the future.
  • virtual void paintGL () override — Paint the plot.
  • virtual void resizeGL (int width, int height) override — No operation - reserved for some potential use in the future.

🍓 Protected Member Functions inherited from QwtPlotAbstractGLCanvas

  • void replot ()
  • void draw (QPainter *) — Helper function for the derived plot canvas.

💜 Protected Member Functions inherited from QwtPlotAbstractCanvas

  • QWidget * canvasWidget ()
  • const QWidget * canvasWidget () const
  • virtual void drawFocusIndicator (QPainter *)
  • virtual void drawBorder (QPainter *)
  • virtual void drawBackground (QPainter *) — Helper function for the derived plot canvas.
  • void fillBackground (QPainter *) — Helper function for the derived plot canvas.
  • void drawCanvas (QPainter *) — Draw the plot to the canvas.
  • void drawStyled (QPainter *, bool) — Helper function for the derived plot canvas.
  • void drawUnstyled (QPainter *) — Helper function for the derived plot canvas.
  • QPainterPath canvasBorderPath (const QRect &rect) const
  • void updateStyleSheetInfo () — Update the cached information about the current style sheet.

🎀 Additional Inherited Members 🎀

⭐ Public Types inherited from QwtPlotAbstractGLCanvas

  • enum PaintAttribute { BackingStore = 1, ImmediatePaint = 8 } — Paint attributes.
  • typedef QFlags< PaintAttribute > PaintAttributes — Paint attributes.

🌟 Public Types inherited from QwtPlotAbstractCanvas

  • enum FocusIndicator { NoFocusIndicator, CanvasFocusIndicator, ItemFocusIndicator } — Focus indicator. The default setting is NoFocusIndicator.

💖 Detailed Description 💖

An alternative canvas for a QwtPlot derived from QOpenGLWidget.

Even if QwtPlotOpenGLCanvas is not derived from QFrame it imitates its API. When using style sheets it supports the box model — beside backgrounds with rounded borders.

See also: QwtPlot::setCanvas(), QwtPlotCanvas, QwtPlotCanvas::OpenGLBuffer

Note: Another way for getting hardware accelerated graphics is using an OpenGL offscreen buffer ( QwtPlotCanvas::OpenGLBuffer ) with QwtPlotCanvas. Performance is worse, than rendering straight to a QOpenGLWidget, but is usually better integrated into a desktop application.

Definition at line 34 of file qwt_plot_opengl_canvas.h.

🌈 Constructor & Destructor Documentation 🌈

QwtPlotOpenGLCanvas::QwtPlotOpenGLCanvas (QwtPlot * plot = NULL) [explicit]

Constructor.

Parameters

  • plot — Parent plot widget

See also: QwtPlot::setCanvas()

Definition at line 49 of file qwt_plot_opengl_canvas.cpp.

QwtPlotOpenGLCanvas::QwtPlotOpenGLCanvas (int numSamples, QwtPlot * plot = NULL) [explicit]

Constructor.

Parameters

  • numSamples — Number of samples, see QSurfaceFormat::samples()
  • plot — Parent plot widget

See also: QwtPlot::setCanvas()

Definition at line 63 of file qwt_plot_opengl_canvas.cpp.

QwtPlotOpenGLCanvas::~QwtPlotOpenGLCanvas () [virtual]

Destructor.

Definition at line 94 of file qwt_plot_opengl_canvas.cpp.

🔥 Member Function Documentation 🔥

QPainterPath QwtPlotOpenGLCanvas::borderPath (const QRect & rect) const

Calculate the painter path for a styled or rounded border.

When the canvas has no styled background or rounded borders the painter path is empty.

Parameters

  • rect — Bounding rectangle of the canvas

Returns: Painter path, that can be used for clipping

Definition at line 185 of file qwt_plot_opengl_canvas.cpp.

void QwtPlotOpenGLCanvas::clearBackingStore () [override], [private], [virtual]

Implements QwtPlotAbstractGLCanvas.

Definition at line 170 of file qwt_plot_opengl_canvas.cpp.

bool QwtPlotOpenGLCanvas::event (QEvent * event) [override], [virtual]

Qt event handler for QEvent::PolishRequest and QEvent::StyleChange

Parameters

  • event — Qt Event

Returns: See QGLWidget::event()

Definition at line 116 of file qwt_plot_opengl_canvas.cpp.

void QwtPlotOpenGLCanvas::initializeGL () [override], [protected], [virtual]

No operation - reserved for some potential use in the future.

Definition at line 191 of file qwt_plot_opengl_canvas.cpp.

void QwtPlotOpenGLCanvas::invalidateBackingStore () [override], [virtual]

Invalidate the internal backing store.

Implements QwtPlotAbstractGLCanvas.

Definition at line 165 of file qwt_plot_opengl_canvas.cpp.

void QwtPlotOpenGLCanvas::paintEvent (QPaintEvent * event) [override], [protected], [virtual]

Paint event.

Parameters

  • event — Paint event

See also: QwtPlot::drawCanvas()

Definition at line 105 of file qwt_plot_opengl_canvas.cpp.

void QwtPlotOpenGLCanvas::paintGL () [override], [protected], [virtual]

Paint the plot.

Definition at line 196 of file qwt_plot_opengl_canvas.cpp.

void QwtPlotOpenGLCanvas::replot () [slot]

Invalidate the paint cache and repaint the canvas.

See also: invalidatePaintCache()

Definition at line 159 of file qwt_plot_opengl_canvas.cpp.

void QwtPlotOpenGLCanvas::resizeGL (int width, int height) [override], [protected], [virtual]

No operation - reserved for some potential use in the future.

Definition at line 270 of file qwt_plot_opengl_canvas.cpp.

👑 Author 👑

Generated automatically by Doxygen for Qwt User's Guide from the source code.

Okay that's the whole glow-up, bestie 💅 Footer sign-off: source/version is the Qwt User's Guide, and the page is QwtPlotOpenGLCanvas(3). There's no date printed in the original footer, so we are not inventing one — no cap 😭🫶

📦 where this page comes from