QwtRoundScaleDraw(3)

💅 QwtRoundScaleDraw(3) — manual name: Library Functions Manual 💅

🌸 NAME 🌸

QwtRoundScaleDraw — a class for drawing round scales. That’s her whole assignment, and she ate, no cap.

🎀 SYNOPSIS 🎀

#include <qwt_round_scale_draw.h>

Inherits QwtAbstractScaleDraw.

Inherited by QwtCompassScaleDraw.

💖 Public Member Functions 💖

• QwtRoundScaleDraw () — Constructor.
• virtual ~QwtRoundScaleDraw () — Destructor.
• void setRadius (double radius)
• double radius () const
• void moveCenter (double x, double y) — Move the center of the scale draw, leaving the radius unchanged.
• void moveCenter (const QPointF &)
• QPointF center () const — Get the center of the scale.
• void setAngleRange (double angle1, double angle2) — Adjust the baseline circle segment for round scales.
• virtual double extent (const QFont &) const override

🫶 Public Member Functions inherited from QwtAbstractScaleDraw 🫶

• QwtAbstractScaleDraw () — Constructor.
• virtual ~QwtAbstractScaleDraw () — Destructor.
• void setScaleDiv (const QwtScaleDiv &)
• const QwtScaleDiv & scaleDiv () const
• void setTransformation (QwtTransform *)
• const QwtScaleMap & scaleMap () const
• QwtScaleMap & scaleMap ()
• void enableComponent (ScaleComponent, bool enable=true)
• bool hasComponent (ScaleComponent) const
• void setTickLength (QwtScaleDiv::TickType, double length)
• double tickLength (QwtScaleDiv::TickType) const
• double maxTickLength () const
• void setSpacing (double) — Set the spacing between tick and labels.
• double spacing () const — Get the spacing.
• void setPenWidthF (qreal width) — Specify the width of the scale pen.
• qreal penWidthF () const
• virtual void draw (QPainter *, const QPalette &) const — Draw the scale.
• virtual QwtText label (double) const — Convert a value into its representing label.
• void setMinimumExtent (double) — Set a minimum for the extent.
• double minimumExtent () const
• void invalidateCache ()

🛡️ Protected Member Functions 🛡️

• virtual void drawTick (QPainter *, double value, double len) const — override.
• virtual void drawBackbone (QPainter *) const override
• virtual void drawLabel (QPainter *, double value) const override

🧚 Protected Member Functions inherited from QwtAbstractScaleDraw 🧚

• const QwtText & tickLabel (const QFont &, double value) const — Convert a value into its representing label and cache it.

🧬 Additional Inherited Members 🧬

🧬 Public Types inherited from QwtAbstractScaleDraw 🧬

• enum ScaleComponent { Backbone = 0x01, Ticks = 0x02, Labels = 0x04 }
• typedef QFlags< ScaleComponent > ScaleComponents

🌟 Detailed Description 🌟

Okay so QwtRoundScaleDraw is literally a class for drawing round scales. You can use it to draw round scales — that’s the vibe. The circle segment can be adjusted with setAngleRange(). The geometry of the scale can be specified with moveCenter() and setRadius().

After a scale division has been specified as a QwtScaleDiv object using QwtAbstractScaleDraw::setScaleDiv(const QwtScaleDiv &s), the scale can be drawn with the QwtAbstractScaleDraw::draw() member. Slay.

📌 Definition at line 31 of file qwt_round_scale_draw.h.

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💫 Constructor & Destructor Documentation 💫

QwtRoundScaleDraw::QwtRoundScaleDraw ()

Constructor. The range of the scale is initialized to [0, 100], The center is set to (50, 50) with a radius of 50. The angle range is set to [-135, 135]. Those are the factory settings, bestie.

📌 Definition at line 44 of file qwt_round_scale_draw.cpp.

QwtRoundScaleDraw::~QwtRoundScaleDraw () — [virtual]

Destructor. She’s logging off, but make it graceful.

📌 Definition at line 53 of file qwt_round_scale_draw.cpp.

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🔥 Member Function Documentation 🔥

QPointF QwtRoundScaleDraw::center () const

Get the center of the scale. The main character location, basically.

📌 Definition at line 96 of file qwt_round_scale_draw.cpp.

void QwtRoundScaleDraw::drawBackbone (QPainter * painter) const — [override], [protected], [virtual]

Draws the baseline of the scale. It’s giving structural support, honestly.

Parameters:

• painter — Painter.

See also: drawTick(), drawLabel().

Implements QwtAbstractScaleDraw.

📌 Definition at line 224 of file qwt_round_scale_draw.cpp.

void QwtRoundScaleDraw::drawLabel (QPainter * painter, double value) const — [override], [protected], [virtual]

Draws the label for a major scale tick. Communication icon behavior.

Parameters:

• painter — Painter.
• value — Value.

See also: drawTick(), drawBackbone().

Implements QwtAbstractScaleDraw.

📌 Definition at line 145 of file qwt_round_scale_draw.cpp.

void QwtRoundScaleDraw::drawTick (QPainter * painter, double value, double len) const — [override], [protected], [virtual]

Draw a tick. Tiny mark, big purpose.

Parameters:

• painter — Painter.
• value — Value of the tick.
• len — Length of the tick.

See also: drawBackbone(), drawLabel().

Implements QwtAbstractScaleDraw.

📌 Definition at line 190 of file qwt_round_scale_draw.cpp.

double QwtRoundScaleDraw::extent (const QFont & font) const — [override], [virtual]

Calculate the extent of the scale.

The extent is the distance from the baseline to the outermost pixel of the scale draw. radius() + extent() is an upper limit for the radius of the bounding circle.

Parameters:

• font — Font used for painting the labels.

Returns: Calculated extent.

See also: setMinimumExtent(), minimumExtent().

Warning: The implemented algorithm is not too smart and calculates only an upper limit, that might be a few pixels too large.

Implements QwtAbstractScaleDraw.

📌 Definition at line 255 of file qwt_round_scale_draw.cpp.

void QwtRoundScaleDraw::moveCenter (const QPointF & center)

Move the center of the scale draw, leaving the radius unchanged. Relocation era, but make it cute.

Parameters:

• center — New center.

See also: setRadius().

📌 Definition at line 90 of file qwt_round_scale_draw.cpp.

void QwtRoundScaleDraw::moveCenter (double x, double y) — [inline]

Move the center of the scale draw, leaving the radius unchanged. Same energy, coordinate edition.

📌 Definition at line 64 of file qwt_round_scale_draw.h.

double QwtRoundScaleDraw::radius () const

Get the radius.

Radius is the radius of the backbone without ticks and labels.

Returns: Radius of the scale.

See also: setRadius(), extent().

📌 Definition at line 79 of file qwt_round_scale_draw.cpp.

void QwtRoundScaleDraw::setAngleRange (double angle1, double angle2)

Adjust the baseline circle segment for round scales. The baseline will be drawn from min(angle1,angle2) to max(angle1, angle2). The default setting is [ -135, 135 ]. An angle of 0 degrees corresponds to the 12 o’clock position, and positive angles count in a clockwise direction.

Parameters:

• angle1, angle2 — boundaries of the angle interval in degrees.

Warning: - The angle range is limited to [-360, 360] degrees. Angles exceeding this range will be clipped. - For angles more or equal than 360 degrees above or below min(angle1, angle2), scale marks will not be drawn. - If you need a counterclockwise scale, use QwtScaleDiv::setInterval()

📌 Definition at line 118 of file qwt_round_scale_draw.cpp.

void QwtRoundScaleDraw::setRadius (double radius)

Change the radius of the scale. Yes, that’s the assignment.

Radius is the radius of the backbone without ticks and labels.

Parameters:

• radius — New Radius.

See also: moveCenter().

📌 Definition at line 66 of file qwt_round_scale_draw.cpp.

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✍️ Author ✍️

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

So the author is literally Doxygen doing its thing for Qwt User’s Guide — no cap.

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💖 footer sign-off: Qwt User's Guide · QwtRoundScaleDraw(3). The original footer doesn’t list a date, so I’m not inventing one — mwah, bestie. 🫶