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QwtRoundScaleDraw(3)           Qwt User's Guide           QwtRoundScaleDraw(3)


QwtRoundScaleDraw -


#include <qwt_round_scale_draw.h> Inherits QwtAbstractScaleDraw. Inherited by QwtDialScaleDraw. 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 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 Lenght 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: o The angle range is limited to [-360, 360] degrees. Angles exceeding this range will be clipped. o For angles more than 359 degrees above or below min(angle1, angle2), scale marks will not be drawn. o 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 Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 5.2.3 Tue Nov 20 2012 QwtRoundScaleDraw(3)

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