QwtRoundScaleDraw(3)

🎀 QwtRoundScaleDraw 🎀

okay bestie, sit down, hydrate, because we're doing QwtRoundScaleDraw today 💖 this page comes straight out of the Qwt User's Guide, and honestly? it's giving "short but iconic". let's get into it ✨

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NAME 🌸

QwtRoundScaleDraw — the class that draws round scales, no cap. 💅

fr fr that's it, that's the whole NAME section. the original page is lowkey minimal here, so we're not gonna invent lore. 🙈

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SYNOPSIS ✨

#include <qwt_round_scale_draw.h>

Inherits QwtAbstractScaleDraw.

Inherited by QwtDialScaleDraw.

so it inherits from QwtAbstractScaleDraw, and QwtDialScaleDraw inherits from it. it's a whole family tree, we love a dynasty 👑

💅 Public Member Functions

• QwtRoundScaleDraw ()
• QwtRoundScaleDraw (const QwtRoundScaleDraw &)
• virtual ~QwtRoundScaleDraw ()
• QPoint center () const
• virtual int extent (const QPen &, const QFont &) const
• void moveCenter (int x, int y)
• void moveCenter (const QPoint &)
• QwtRoundScaleDraw & operator= (const QwtRoundScaleDraw &other)
• int radius () const
• void setAngleRange (double angle1, double angle2)
• void setRadius (int radius)

🫶 Protected Member Functions

• virtual void drawBackbone (QPainter *p) const
• virtual void drawLabel (QPainter *p, double val) const
• virtual void drawTick (QPainter *p, double val, int len) const

✨ Additional Inherited Members

and yeah, there's a whole "Additional Inherited Members" situation — they're inherited, bestie, so the page just gestures at them and moves on 🙈

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Detailed Description 💖

A class for drawing round scales. that's the vibe. 🌀

QwtRoundScaleDraw can be used to draw round scales. The circle segment can be adjusted by QwtRoundScaleDraw::setAngleRange(). The geometry of the scale can be specified with QwtRoundScaleDraw::moveCenter() and QwtRoundScaleDraw::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.

so like — set your div, place your circle, angle your arc, draw. that's the whole flow, and it ate. 🔥

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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].

so the defaults are already giving main character energy — you get a whole usable scale for free, no setup required 🫶

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Member Function Documentation 💜

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

Draws the baseline of the scale.

Parameters:

• painter — Painter

See also: drawTick(), drawLabel()

Implements QwtAbstractScaleDraw.

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

Draws the label for a major scale tick. 🏷️

Parameters:

• painter — Painter
• value — Value

See also: drawTick(), drawBackbone()

Implements QwtAbstractScaleDraw.

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

Draw a tick. tiny little mark, huge responsibility ✨

Parameters:

• painter — Painter
• value — Value of the tick
• len — Lenght of the tick

See also: drawBackbone(), drawLabel()

Implements QwtAbstractScaleDraw.

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int QwtRoundScaleDraw::extent (const QPen &pen, const QFont &font) const [virtual]

Calculate the extent of the scale.

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

Parameters:

• pen — Pen that is used for painting backbone and ticks
• font — Font used for painting the labels

See also: setMinimumExtent(), minimumExtent()

Warning ⚠️ — The implemented algo is not too smart and calculates only an upper limit, that might be a few pixels too large. bestie it's doing its best, it's just not doing math class 💀

Implements QwtAbstractScaleDraw.

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void QwtRoundScaleDraw::moveCenter (const QPoint &center)

Move the center of the scale draw, leaving the radius unchanged.

Parameters:

• center — New center

See also: setRadius()

heads up: the public list also has void moveCenter (int x, int y), but this page only writes up the QPoint overload. both are listed, neither is invented. 🙈

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int QwtRoundScaleDraw::radius () const

Get the radius.

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

See also: setRadius(), extent()

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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 ⚠️ — read this twice, bestie: - The angle range is limited to [-360, 360] degrees. Angles exceeding this range will be clipped. - For angles more than 359 degrees above or below min(angle1, angle2), scale marks will not be drawn. - If you need a counterclockwise scale, use QwtScaleDiv::setRange

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void QwtRoundScaleDraw::setRadius (int radius)

Change of radius the scale.

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

Parameters:

• radius — New Radius

See also: moveCenter()

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Author 🌈

Generated automatically by Doxygen for Qwt User's Guide from the source code. so like, a robot wrote the skeleton, and i gave it the glow-up 💅✨

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and that's the page, bestie!! Version 5.2.3, dated Tue Nov 20 2012 — a whole vintage icon, and honestly it still slays. go draw some round scales, you've got this 🦋💖🎀