QwtPolarCanvas(3)

📦
version 6.3.0 · 2 versions
, in alpine 3.24

💅 QwtPolarCanvas(3) — Library Functions Manual ✨

Okay so bestie, welcome to the group chat for QwtPolarCanvas — the absolute main character of polar plotting widgets. This page is giving full manual energy but make it cute. Let's get into it. 🎀

✨ NAME ✨

QwtPolarCanvas — the canvas of a QwtPolarPlot. That's it. That's the vibe. It's the widget where all your polar dreams get painted. 🌈

🦋 SYNOPSIS 🦋

#include <qwt_polar_canvas.h>

Inherits QFrame.

Lowkey inherits from QFrame so it's already coming from good stock. 💅

Public Types

  • enum PaintAttribute { BackingStore = 0x01 } — Paint attributes. The little switches that control how painting happens. 🎨
  • typedef QFlags< PaintAttribute > PaintAttributes — An ORed combo of PaintAttribute values. Like a little bitmask buffet. 🍓

Public Member Functions

  • QwtPolarCanvas(QwtPolarPlot *) — Constructor. It's giving new canvas energy. ✨
  • virtual ~QwtPolarCanvas() — Destructor. Saying bye with style. 🫶
  • QwtPolarPlot * plot() — Gets the parent plot. The main squeeze. 👑
  • const QwtPolarPlot * plot() const — The const version. Same plot, read-only. No touching. 🙈
  • void setPaintAttribute(PaintAttribute, bool on = true) — Changing the paint attributes. Flipping switches like a DJ. 🎛️
  • bool testPaintAttribute(PaintAttribute) const — Checks if a paint attribute is enabled. The vibe check. ✅
  • const QPixmap * backingStore() const — Returns the backing store, might be null. It's giving maybe there, maybe not. 😭
  • void invalidateBackingStore() — Invalidates the internal backing store. Basically saying "forget what you thought you knew". 💀
  • QwtPointPolar invTransform(const QPoint &) const — Translates a point from widget into plot coordinates. Glow-up for coordinates. ✨
  • QPoint transform(const QwtPointPolar &) const — Translates a point from plot into widget coordinates. The reverse glow-up. 🔁

Protected Member Functions

  • virtual void paintEvent(QPaintEvent *) override — Paint event. The actual painting moment. 🖌️
  • virtual void resizeEvent(QResizeEvent *) override — Resize event. When things change shape. 🦋

🌸 Detailed Description 🌸

So like, QwtPolarCanvas is the canvas of a QwtPolarPlot. It's the widget where all polar items are painted to. Periodt. 💅

Note: In opposite to QwtPlot all axes are painted on the canvas. So yeah, axes are on the canvas. Not off to the side. Iconic behavior. 👑

See also: QwtPolarPlot

Definition: line 27 of file qwt_polar_canvas.h.

🎀 Member Typedef Documentation 🎀

typedef QFlags<PaintAttribute > QwtPolarCanvas::PaintAttributes

An ORed combination of PaintAttribute values. Like mixing and matching your fave accessories. 🎨

Definition: line 50 of file qwt_polar_canvas.h.

💖 Member Enumeration Documentation 💖

enum QwtPolarCanvas::PaintAttribute

Paint attributes. The default setting enables BackingStore. So it's already on unless you mess with it. Slay. 💅

See also: setPaintAttribute(), testPaintAttribute(), backingStore()

Enumerator

  • BackingStore — Paint double buffered and reuse the content of the pixmap buffer for some spontaneous repaints that happen when a plot gets unhidden, deiconified or changes the focus. It's giving reuse, reduce, recycle but for pixels. 🍓
Definition: line 40 of file qwt_polar_canvas.h.

🌈 Constructor & Destructor Documentation 🌈

QwtPolarCanvas::QwtPolarCanvas(QwtPolarPlot * plot) [explicit]

Constructor. It's giving new canvas energy. ✨

Definition: line 77 of file qwt_polar_canvas.cpp.

QwtPolarCanvas::~QwtPolarCanvas() [virtual]

Destructor. Saying bye with style. 🫶

Definition: line 91 of file qwt_polar_canvas.cpp.

🌟 Member Function Documentation 🌟

const QPixmap * QwtPolarCanvas::backingStore() const

Returns: Backing store, might be null. It's giving maybe there, maybe not. 😭

Definition: line 170 of file qwt_polar_canvas.cpp.

void QwtPolarCanvas::invalidateBackingStore()

Invalidate the internal backing store. Basically saying "forget what you thought you knew". 💀

Definition: line 176 of file qwt_polar_canvas.cpp.

QwtPointPolar QwtPolarCanvas::invTransform(const QPoint & pos) const

Translate a point from widget into plot coordinates. Glow-up for coordinates. ✨

Parameters:

  • pos — Point in widget coordinates of the plot canvas

Returns: Point in plot coordinates

See also: transform()

Definition: line 267 of file qwt_polar_canvas.cpp.

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

Paint event. The actual painting moment. 🖌️

Parameters:

  • event — Paint event
Definition: line 186 of file qwt_polar_canvas.cpp.

QwtPolarPlot * QwtPolarCanvas::plot()

Returns: Parent plot widget. The main squeeze. 👑

Definition: line 97 of file qwt_polar_canvas.cpp.

const QwtPolarPlot * QwtPolarCanvas::plot() const

Returns: Parent plot widget. Same plot, read-only. No touching. 🙈

Definition: line 103 of file qwt_polar_canvas.cpp.

void QwtPolarCanvas::resizeEvent(QResizeEvent * event) [override], [protected], [virtual]

Resize event. When things change shape. 🦋

Parameters:

  • event — Resize event
Definition: line 251 of file qwt_polar_canvas.cpp.

void QwtPolarCanvas::setPaintAttribute(PaintAttribute attribute, bool on = true)

Changing the paint attributes. Flipping switches like a DJ. 🎛️

Parameters:

  • attribute — Paint attribute
  • on — On/Off

The default setting enables BackingStore. So yeah, it's already on. 💅

See also: testPaintAttribute(), paintCache()

Definition: line 118 of file qwt_polar_canvas.cpp.

bool QwtPolarCanvas::testPaintAttribute(PaintAttribute attribute) const

Test whether a paint attribute is enabled. The vibe check. ✅

Parameters:

  • attribute — Paint attribute

Returns: true if the attribute is enabled

See also: setPaintAttribute()

Definition: line 164 of file qwt_polar_canvas.cpp.

QPoint QwtPolarCanvas::transform(const QwtPointPolar & polarPos) const

Translate a point from plot into widget coordinates. The reverse glow-up. 🔁

Parameters:

  • polarPos — Point in plot coordinates

Returns: Point in widget coordinates

See also: transform()

Definition: line 310 of file qwt_polar_canvas.cpp.

👑 Author 👑

Generated automatically by Doxygen for Qwt User's Guide from the source code. So it's not a human author, it's a robot. Still iconic though. 🤖✨

💖 Okay bestie, that's the whole manual. Source/version: Qwt User's Guide, page: QwtPolarCanvas(3). Stay slay, and may your backing store always be valid. 💅🎀

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