QwtPlotRenderer(3)

📦

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💅 QwtPlotRenderer(3) — the library-functions manual, but make it cute

okay so bestie. this one's a Library Functions Manual page for QwtPlotRenderer(3), and it's basically the glow-up artist for your plots ✨ It's the renderer that takes a plot and exports it to a document, a printer, or literally anything else that QPainter/QPaintDevice can handle. Iconic behavior, honestly.

🌸 NAME 🌸

QwtPlotRenderer — Renderer for exporting a plot to a document, a printer or anything else, that is supported by QPainter/QPaintDevice. 💖

✨ SYNOPSIS ✨

#include <qwt_plot_renderer.h>

Inherits QObject. 🫶

🎀 Public Types 🎀

enum DiscardFlag — { DiscardNone = 0x00, DiscardBackground = 0x01, DiscardTitle = 0x02, DiscardLegend = 0x04, DiscardCanvasBackground = 0x08, DiscardFooter = 0x10, DiscardCanvasFrame = 0x20 } — these are the Discard flags 💅
enum LayoutFlag — { DefaultLayout = 0x00, FrameWithScales = 0x01 } — these are the Layout flags 🦋
typedef QFlags< DiscardFlag > DiscardFlags
typedef QFlags< LayoutFlag > LayoutFlags

💜 Public Member Functions 💜

QwtPlotRenderer (QObject *=NULL)
virtual ~QwtPlotRenderer () — Destructor 💀
void setDiscardFlag (DiscardFlag flag, bool on=true)
bool testDiscardFlag (DiscardFlag flag) const
void setDiscardFlags (DiscardFlags flags)
DiscardFlags discardFlags () const
void setLayoutFlag (LayoutFlag flag, bool on=true)
bool testLayoutFlag (LayoutFlag flag) const
void setLayoutFlags (LayoutFlags flags)
LayoutFlags layoutFlags () const
void renderDocument (QwtPlot *, const QString &fileName, const QSizeF &sizeMM, int resolution=85)
void renderDocument (QwtPlot *, const QString &fileName, const QString &format, const QSizeF &sizeMM, int resolution=85)
void renderTo (QwtPlot *, QPrinter &) const — Render the plot to a QPrinter 🖨️
void renderTo (QwtPlot *, QPaintDevice &) const — Render the plot to a QPaintDevice 🎨
virtual void render (QwtPlot *, QPainter *, const QRectF &plotRect) const
virtual void renderTitle (const QwtPlot *, QPainter *, const QRectF &titleRect) const
virtual void renderFooter (const QwtPlot *, QPainter *, const QRectF &footerRect) const
virtual void renderScale (const QwtPlot *, QPainter *, QwtAxisId, int startDist, int endDist, int baseDist, const QRectF &scaleRect) const — Paint a scale into a given rectangle. Paint the scale into a given rectangle. (yes it says it twice, she's thorough 💅)
virtual void renderCanvas (const QwtPlot *, QPainter *, const QRectF &canvasRect, const QwtScaleMap *maps) const
virtual void renderLegend (const QwtPlot *, QPainter *, const QRectF &legendRect) const
bool exportTo (QwtPlot *, const QString &documentName, const QSizeF &sizeMM=QSizeF(300, 200), int resolution=85) — Execute a file dialog and render the plot to the selected file 📁

🌈 Detailed Description 🌈

Renderer for exporting a plot to a document, a printer or anything else, that is supported by QPainter/QPaintDevice. fr fr, that's the whole gig and she ate. 👑

Definition at line 39 of file qwt_plot_renderer.h.

🧚 Member Typedef Documentation 🧚

`typedef QFlags<DiscardFlag > QwtPlotRenderer::DiscardFlags`

An ORed combination of DiscardFlag values. lowkey the "pick your faves" bit 💖

Definition at line 76 of file qwt_plot_renderer.h.

`typedef QFlags<LayoutFlag > QwtPlotRenderer::LayoutFlags`

An ORed combination of LayoutFlag values. same vibe, different flag set 🦋

Definition at line 94 of file qwt_plot_renderer.h.

🎀 Member Enumeration Documentation 🎀

`enum QwtPlotRenderer::DiscardFlag`

Discard flags. The way these just let you say "no thank you" to parts of the plot 😌✨

Enumerator:

DiscardNone — Render all components of the plot. (the full slay, nothing skipped 👑)
DiscardBackground — Don't render the background of the plot.
DiscardTitle — Don't render the title of the plot.
DiscardLegend — Don't render the legend of the plot.
DiscardCanvasBackground — Don't render the background of the canvas.
DiscardFooter — Don't render the footer of the plot.
DiscardCanvasFrame — Don't render the frame of the canvas

Note: This flag has no effect when using style sheets, where the frame is part of the background. ngl that's important, don't come for me 🫶

Definition at line 45 of file qwt_plot_renderer.h.

`enum QwtPlotRenderer::LayoutFlag`

Layout flags.

See also: setLayoutFlag(), testLayoutFlag()

Enumerator:

DefaultLayout — Use the default layout as on screen. 🖥️
FrameWithScales — Instead of the scales a box is painted around the plot canvas, where the scale ticks are aligned to. 📦

Definition at line 82 of file qwt_plot_renderer.h.

💖 Constructor & Destructor Documentation 💖

**`QwtPlotRenderer::QwtPlotRenderer (QObject * parent = NULL) [explicit]`**

Constructor ✨

Parameters:

parent — Parent object

Definition at line 146 of file qwt_plot_renderer.cpp.

`QwtPlotRenderer::~QwtPlotRenderer () [virtual]`

Destructor. 💀

Definition at line 153 of file qwt_plot_renderer.cpp.

...and that's just part 1, bestie — more coming, don't go anywhere 💅🦋

💅 Member Function Documentation 💅

this part is where every method gets its moment, and yes we’re doing all of them. grab a strawberry 🍓 and let’s go.

✨ `discardFlags()` ✨

QwtPlotRenderer::DiscardFlags QwtPlotRenderer::discardFlags () const

This one hands you the flags that say what to discard from rendering. That’s it — it’s giving “what are we throwing out” energy.

Returns: Flags, indicating what to discard from rendering.

See also: DiscardFlag, setDiscardFlags(), setDiscardFlag(), testDiscardFlag()

Definition at line 199 of file qwt_plot_renderer.cpp.

💖 `exportTo()` 💖

bool QwtPlotRenderer::exportTo (QwtPlot * plot, const QString & documentName, const QSizeF & sizeMM = QSizeF( 300, 200 ), int resolution = 85)

This cutie opens a file dialog and renders the plot to the file you pick. Very “save your masterpiece” behavior.

Parameters:

plot — Plot widget
documentName — Default document name
sizeMM — Size for the document in millimeters.
resolution — Resolution in dots per Inch (dpi)

Returns: True, when exporting was successful.

See also: renderDocument()

Definition at line 1060 of file qwt_plot_renderer.cpp.

🌸 `layoutFlags()` 🌸

QwtPlotRenderer::LayoutFlags QwtPlotRenderer::layoutFlags () const

Here’s where you get the layout flags back. It’s the layout vibe check, basically.

Returns: Layout flags.

See also: LayoutFlag, setLayoutFlags(), setLayoutFlag(), testLayoutFlag()

Definition at line 245 of file qwt_plot_renderer.cpp.

🦋 `render()` 🦋

void QwtPlotRenderer::render (QwtPlot * plot, QPainter * painter, const QRectF & plotRect) const [virtual]

This one paints the contents of a QwtPlot instance into a given rectangle. Main-character rendering behavior, no cap.

Parameters:

plot — Plot to be rendered
painter — Painter
plotRect — Bounding rectangle

See also: renderDocument(), renderTo(), QwtPainter::setRoundingAlignment()

Definition at line 482 of file qwt_plot_renderer.cpp.

🎀 `renderCanvas()` 🎀

void QwtPlotRenderer::renderCanvas (const QwtPlot * plot, QPainter * painter, const QRectF & canvasRect, const QwtScaleMap * maps) const [virtual]

This renders the canvas into a given rectangle. It’s the canvas moment, literally.

Parameters:

plot — Plot widget
painter — Painter
maps — Maps mapping between plot and paint device coordinates
canvasRect — Canvas rectangle

Definition at line 831 of file qwt_plot_renderer.cpp.

💜 `renderDocument()` — first overload 💜

void QwtPlotRenderer::renderDocument (QwtPlot * plot, const QString & fileName, const QSizeF & sizeMM, int resolution = 85)

This renders a plot to a file. The format of the document will be auto-detected from the suffix of the file name — cute and convenient.

Parameters:

plot — Plot widget
fileName — Path of the file, where the document will be stored
sizeMM — Size for the document in millimeters.
resolution — Resolution in dots per Inch (dpi)

Definition at line 261 of file qwt_plot_renderer.cpp.

🔥 `renderDocument()` — second overload 🔥

void QwtPlotRenderer::renderDocument (QwtPlot * plot, const QString & fileName, const QString & format, const QSizeF & sizeMM, int resolution = 85)

This one also renders a plot to a file, but you get to name the format yourself instead of letting the suffix decide.

Supported formats are:

pdf — Portable Document Format PDF
ps — Postcript
svg — Scalable Vector Graphics SVG
all image formats supported by Qt — see QImageWriter::supportedImageFormats()

Scalable vector graphic formats like PDF or SVG are superior to raster graphics formats.

Parameters:

plot — Plot widget
fileName — Path of the file, where the document will be stored
format — Format for the document
sizeMM — Size for the document in millimeters.
resolution — Resolution in dots per Inch (dpi)

See also: renderTo(), render(), QwtPainter::setRoundingAlignment()

Definition at line 293 of file qwt_plot_renderer.cpp.

🧚 `renderFooter()` 🧚

void QwtPlotRenderer::renderFooter (const QwtPlot * plot, QPainter * painter, const QRectF & footerRect) const [virtual]

This renders the footer into a given rectangle. Footer rights, protected and respected.

Parameters:

plot — Plot widget
painter — Painter
footerRect — Bounding rectangle for the footer

Definition at line 692 of file qwt_plot_renderer.cpp.

🌈 `renderLegend()` 🌈

void QwtPlotRenderer::renderLegend (const QwtPlot * plot, QPainter * painter, const QRectF & legendRect) const [virtual]

This renders the legend into a given rectangle. The legend is lowkey the moment, so obviously it gets its own method.

Parameters:

plot — Plot widget
painter — Painter
legendRect — Bounding rectangle for the legend

Definition at line 711 of file qwt_plot_renderer.cpp.

⭐ `renderScale()` ⭐

void QwtPlotRenderer::renderScale (const QwtPlot * plot, QPainter * painter, QwtAxisId axisId, int startDist, int endDist, int baseDist, const QRectF & scaleRect) const [virtual]

Paint a scale into a given rectangle. Paint the scale into a given rectangle — yes, the docs said it twice, and we’re respecting the lore. 💅

Parameters:

plot — Plot widget
painter — Painter
axisId — Axis
startDist — Start border distance
endDist — End border distance
baseDist — Base distance
scaleRect — Bounding rectangle for the scale

Definition at line 733 of file qwt_plot_renderer.cpp.

👑 `renderTitle()` 👑

void QwtPlotRenderer::renderTitle (const QwtPlot * plot, QPainter * painter, const QRectF & titleRect) const [virtual]

This renders the title into a given rectangle. Title treatment, because obviously the title is main character energy.

Parameters:

plot — Plot widget
painter — Painter
titleRect — Bounding rectangle for the title

Definition at line 673 of file qwt_plot_renderer.cpp.

🫶 `renderTo()` — `QPaintDevice` overload 🫶

void QwtPlotRenderer::renderTo (QwtPlot * plot, QPaintDevice & paintDevice) const

Render the plot to a QPaintDevice. This function renders the contents of a QwtPlot instance to QPaintDevice object. The target rectangle is derived from its device metrics.

Parameters:

plot — Plot to be rendered
paintDevice — device to paint on, f.e a QImage

See also: renderDocument(), render(), QwtPainter::setRoundingAlignment()

Definition at line 402 of file qwt_plot_renderer.cpp.

🖨️ `renderTo()` — `QPrinter` overload 🖨️

void QwtPlotRenderer::renderTo (QwtPlot * plot, QPrinter & printer) const

Render the plot to a QPrinter. This function renders the contents of a QwtPlot instance to QPaintDevice object. The size is derived from the printer metrics.

Parameters:

plot — Plot to be rendered
printer — Printer to paint on

See also: renderDocument(), render(), QwtPainter::setRoundingAlignment()

Definition at line 427 of file qwt_plot_renderer.cpp.

🎀 `setDiscardFlag()` 🎀

void QwtPlotRenderer::setDiscardFlag (DiscardFlag flag, bool on = true)

Change a flag, indicating what to discard from rendering. Tiny toggle, big power.

Parameters:

flag — Flag to change
on — On/Off

See also: DiscardFlag, testDiscardFlag(), setDiscardFlags(), discardFlags()

Definition at line 166 of file qwt_plot_renderer.cpp.

💖 `setDiscardFlags()` 💖

void QwtPlotRenderer::setDiscardFlags (DiscardFlags flags)

Set the flags, indicating what to discard from rendering. This is the whole set, bestie — not just one flag.

Parameters:

flags — Flags

See also: DiscardFlag, setDiscardFlag(), testDiscardFlag(), discardFlags()

Definition at line 190 of file qwt_plot_renderer.cpp.

✨ `setLayoutFlag()` ✨

void QwtPlotRenderer::setLayoutFlag (LayoutFlag flag, bool on = true)

Change a layout flag. One little layout switch at a time.

Parameters:

flag — Flag to change
on — On/Off

See also: LayoutFlag, testLayoutFlag(), setLayoutFlags(), layoutFlags()

Definition at line 212 of file qwt_plot_renderer.cpp.

🌸 `setLayoutFlags()` 🌸

void QwtPlotRenderer::setLayoutFlags (LayoutFlags flags)

Set the layout flags. All the layout flags, together, slaying as a set.

Parameters:

flags — Flags

See also: LayoutFlag, setLayoutFlag(), testLayoutFlag(), layoutFlags()

Definition at line 236 of file qwt_plot_renderer.cpp.

🦋 `testDiscardFlag()` 🦋

bool QwtPlotRenderer::testDiscardFlag (DiscardFlag flag) const

Checks whether this discard flag is enabled.

Returns: True, if flag is enabled.

Parameters:

flag — Flag to be tested

See also: DiscardFlag, setDiscardFlag(), setDiscardFlags(), discardFlags()

Definition at line 179 of file qwt_plot_renderer.cpp.

🌈 `testLayoutFlag()` 🌈

bool QwtPlotRenderer::testLayoutFlag (LayoutFlag flag) const

Checks whether this layout flag is enabled.

Returns: True, if flag is enabled.

Parameters:

flag — Flag to be tested

See also: LayoutFlag, setLayoutFlag(), setLayoutFlags(), layoutFlags()

Definition at line 225 of file qwt_plot_renderer.cpp.

👑 Author 👑

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

okay that’s the whole page, bestie 💖 footer sign-off: source/version: Qwt User's Guide, page: QwtPlotRenderer(3), and the date is whatever your local footer stamped there. mwah 💋✨

📦 where this page comes from

alpine 3.24: qwt-doc 6.3.0-r0 · custom
💖 girlified by deepseek-ai/DeepSeek-V4.1-Flash-1017 on 2026-11-04: a language model's rewrite of the original, under its terms

QwtPlotRenderer(3)

💅 QwtPlotRenderer(3) — the library-functions manual, but make it cute

🌸 NAME 🌸

✨ SYNOPSIS ✨

🎀 Public Types 🎀

💜 Public Member Functions 💜

🌈 Detailed Description 🌈

🧚 Member Typedef Documentation 🧚

typedef QFlags<DiscardFlag > QwtPlotRenderer::DiscardFlags

typedef QFlags<LayoutFlag > QwtPlotRenderer::LayoutFlags

🎀 Member Enumeration Documentation 🎀

enum QwtPlotRenderer::DiscardFlag

enum QwtPlotRenderer::LayoutFlag

💖 Constructor & Destructor Documentation 💖

QwtPlotRenderer::QwtPlotRenderer (QObject * parent = NULL) [explicit]

QwtPlotRenderer::~QwtPlotRenderer () [virtual]

💅 Member Function Documentation 💅

✨ discardFlags() ✨

💖 exportTo() 💖

🌸 layoutFlags() 🌸

🦋 render() 🦋

🎀 renderCanvas() 🎀

💜 renderDocument() — first overload 💜

🔥 renderDocument() — second overload 🔥

🧚 renderFooter() 🧚

🌈 renderLegend() 🌈

⭐ renderScale() ⭐

👑 renderTitle() 👑

🫶 renderTo() — QPaintDevice overload 🫶

🖨️ renderTo() — QPrinter overload 🖨️

🎀 setDiscardFlag() 🎀

💖 setDiscardFlags() 💖

✨ setLayoutFlag() ✨

🌸 setLayoutFlags() 🌸

🦋 testDiscardFlag() 🦋

🌈 testLayoutFlag() 🌈

👑 Author 👑

`typedef QFlags<DiscardFlag > QwtPlotRenderer::DiscardFlags`

`typedef QFlags<LayoutFlag > QwtPlotRenderer::LayoutFlags`

`enum QwtPlotRenderer::DiscardFlag`

`enum QwtPlotRenderer::LayoutFlag`

**`QwtPlotRenderer::QwtPlotRenderer (QObject * parent = NULL) [explicit]`**

`QwtPlotRenderer::~QwtPlotRenderer () [virtual]`

✨ `discardFlags()` ✨

💖 `exportTo()` 💖

🌸 `layoutFlags()` 🌸

🦋 `render()` 🦋

🎀 `renderCanvas()` 🎀

💜 `renderDocument()` — first overload 💜

🔥 `renderDocument()` — second overload 🔥

🧚 `renderFooter()` 🧚

🌈 `renderLegend()` 🌈

⭐ `renderScale()` ⭐

👑 `renderTitle()` 👑

🫶 `renderTo()` — `QPaintDevice` overload 🫶

🖨️ `renderTo()` — `QPrinter` overload 🖨️

🎀 `setDiscardFlag()` 🎀

💖 `setDiscardFlags()` 💖

✨ `setLayoutFlag()` ✨

🌸 `setLayoutFlags()` 🌸

🦋 `testDiscardFlag()` 🦋

🌈 `testLayoutFlag()` 🌈