conflicting packages
| QwtRoundScaleDraw(3) | Qwt User's Guide | QwtRoundScaleDraw(3) |
NAME¶
QwtRoundScaleDraw -SYNOPSIS¶
#include <qwt_round_scale_draw.h> Inherits QwtAbstractScaleDraw. Inherited by QwtDialScaleDraw.Public Member Functions¶
QwtRoundScaleDraw ()
Protected Member Functions¶
virtual void drawBackbone (QPainter *p) const
Additional Inherited Members¶
Detailed Description¶
A class for drawing round scales. 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.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].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.
void QwtRoundScaleDraw::drawLabel (QPainter *painter, doublevalue) const [protected], [virtual]¶
Draws the label for a major scale tick Parameters:painter Painter
value Value
See also:
drawTick(), drawBackbone()
Implements QwtAbstractScaleDraw.
void QwtRoundScaleDraw::drawTick (QPainter *painter, doublevalue, intlen) const [protected], [virtual]¶
Draw a tick Parameters:painter Painter
value Value of the tick
len Length of the tick
See also:
drawBackbone(), drawLabel()
Implements QwtAbstractScaleDraw.
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
Implements QwtAbstractScaleDraw.
void QwtRoundScaleDraw::moveCenter (const QPoint ¢er)¶
Move the center of the scale draw, leaving the radius unchanged Parameters:center New center
See also:
setRadius()
int QwtRoundScaleDraw::radius () const¶
Get the radius Radius is the radius of the backbone without ticks and labels. See also:setRadius(), extent()
void QwtRoundScaleDraw::setAngleRange (doubleangle1, doubleangle2)¶
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 than 359 degrees above or below min(angle1, angle2), scale marks will not be drawn.
- •
- If you need a counterclockwise scale, use QwtScaleDiv::setRange
void QwtRoundScaleDraw::setRadius (intradius)¶
Change of radius the scale Radius is the radius of the backbone without ticks and labels. Parameters:radius New Radius
See also:
moveCenter()
Author¶
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