彻底改版2.0
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feiyangqingyun
314
third/3rd_qwt/qwt_round_scale_draw.cpp
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314
third/3rd_qwt/qwt_round_scale_draw.cpp
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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#include "qwt_round_scale_draw.h"
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#include "qwt_painter.h"
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#include "qwt_scale_div.h"
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#include "qwt_scale_map.h"
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#include "qwt_math.h"
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#include <qpen.h>
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#include <qpainter.h>
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#include <qfontmetrics.h>
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#include <qmath.h>
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class QwtRoundScaleDraw::PrivateData
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{
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public:
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PrivateData():
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center( 50.0, 50.0 ),
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radius( 50.0 ),
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startAngle( -135.0 ),
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endAngle( 135.0 )
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{
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}
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QPointF center;
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double radius;
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double startAngle;
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double endAngle;
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};
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/*!
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\brief Constructor
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The range of the scale is initialized to [0, 100],
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The center is set to (50, 50) with a radius of 50.
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The angle range is set to [-135, 135].
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*/
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QwtRoundScaleDraw::QwtRoundScaleDraw()
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{
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d_data = new QwtRoundScaleDraw::PrivateData;
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setRadius( 50 );
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scaleMap().setPaintInterval( d_data->startAngle, d_data->endAngle );
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}
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//! Destructor
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QwtRoundScaleDraw::~QwtRoundScaleDraw()
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{
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delete d_data;
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}
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/*!
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Change of radius the scale
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Radius is the radius of the backbone without ticks and labels.
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\param radius New Radius
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\sa moveCenter()
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*/
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void QwtRoundScaleDraw::setRadius( double radius )
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{
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d_data->radius = radius;
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}
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/*!
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Get the radius
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Radius is the radius of the backbone without ticks and labels.
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\return Radius of the scale
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\sa setRadius(), extent()
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*/
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double QwtRoundScaleDraw::radius() const
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{
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return d_data->radius;
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}
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/*!
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Move the center of the scale draw, leaving the radius unchanged
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\param center New center
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\sa setRadius()
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*/
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void QwtRoundScaleDraw::moveCenter( const QPointF ¢er )
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{
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d_data->center = center;
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}
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//! Get the center of the scale
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QPointF QwtRoundScaleDraw::center() const
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{
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return d_data->center;
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}
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/*!
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\brief Adjust the baseline circle segment for round scales.
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The baseline will be drawn from min(angle1,angle2) to max(angle1, angle2).
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The default setting is [ -135, 135 ].
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An angle of 0 degrees corresponds to the 12 o'clock position,
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and positive angles count in a clockwise direction.
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\param angle1
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\param angle2 boundaries of the angle interval in degrees.
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\warning <ul>
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<li>The angle range is limited to [-360, 360] degrees. Angles exceeding
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this range will be clipped.
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<li>For angles more or equal than 360 degrees above or below min(angle1, angle2),
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scale marks will not be drawn.
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<li>If you need a counterclockwise scale, use QwtScaleDiv::setInterval()
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</ul>
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*/
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void QwtRoundScaleDraw::setAngleRange( double angle1, double angle2 )
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{
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#if 0
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angle1 = qBound( -360.0, angle1, 360.0 );
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angle2 = qBound( -360.0, angle2, 360.0 );
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#endif
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d_data->startAngle = angle1;
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d_data->endAngle = angle2;
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if ( d_data->startAngle == d_data->endAngle )
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{
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d_data->startAngle -= 1;
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d_data->endAngle += 1;
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}
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scaleMap().setPaintInterval( d_data->startAngle, d_data->endAngle );
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}
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/*!
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Draws the label for a major scale tick
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\param painter Painter
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\param value Value
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\sa drawTick(), drawBackbone()
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*/
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void QwtRoundScaleDraw::drawLabel( QPainter *painter, double value ) const
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{
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const double tval = scaleMap().transform( value );
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if ( ( tval >= d_data->startAngle + 360.0 )
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|| ( tval <= d_data->startAngle - 360.0 ) )
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{
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return;
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}
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const QwtText label = tickLabel( painter->font(), value );
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if ( label.isEmpty() )
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return;
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double radius = d_data->radius;
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if ( hasComponent( QwtAbstractScaleDraw::Ticks ) ||
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hasComponent( QwtAbstractScaleDraw::Backbone ) )
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{
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radius += spacing();
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}
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if ( hasComponent( QwtAbstractScaleDraw::Ticks ) )
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radius += tickLength( QwtScaleDiv::MajorTick );
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const QSizeF sz = label.textSize( painter->font() );
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const double arc = qwtRadians( tval );
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const double x = d_data->center.x() +
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( radius + sz.width() / 2.0 ) * qSin( arc );
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const double y = d_data->center.y() -
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( radius + sz.height() / 2.0 ) * qCos( arc );
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const QRectF r( x - sz.width() / 2, y - sz.height() / 2,
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sz.width(), sz.height() );
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label.draw( painter, r );
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}
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/*!
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Draw a tick
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\param painter Painter
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\param value Value of the tick
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\param len Lenght of the tick
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\sa drawBackbone(), drawLabel()
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*/
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void QwtRoundScaleDraw::drawTick( QPainter *painter, double value, double len ) const
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{
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if ( len <= 0 )
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return;
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const double tval = scaleMap().transform( value );
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const double cx = d_data->center.x();
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const double cy = d_data->center.y();
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const double radius = d_data->radius;
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if ( ( tval < d_data->startAngle + 360.0 )
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&& ( tval > d_data->startAngle - 360.0 ) )
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{
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const double arc = qwtRadians( tval );
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const double sinArc = qSin( arc );
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const double cosArc = qCos( arc );
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const double x1 = cx + radius * sinArc;
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const double x2 = cx + ( radius + len ) * sinArc;
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const double y1 = cy - radius * cosArc;
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const double y2 = cy - ( radius + len ) * cosArc;
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QwtPainter::drawLine( painter, x1, y1, x2, y2 );
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}
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}
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/*!
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Draws the baseline of the scale
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\param painter Painter
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\sa drawTick(), drawLabel()
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*/
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void QwtRoundScaleDraw::drawBackbone( QPainter *painter ) const
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{
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const double deg1 = scaleMap().p1();
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const double deg2 = scaleMap().p2();
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const int a1 = qRound( qMin( deg1, deg2 ) - 90 );
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const int a2 = qRound( qMax( deg1, deg2 ) - 90 );
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const double radius = d_data->radius;
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const double x = d_data->center.x() - radius;
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const double y = d_data->center.y() - radius;
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painter->drawArc( QRectF( x, y, 2 * radius, 2 * radius ),
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-a2 * 16, ( a2 - a1 + 1 ) * 16 ); // counterclockwise
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}
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/*!
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Calculate the extent of the scale
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The extent is the distance between the baseline to the outermost
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pixel of the scale draw. radius() + extent() is an upper limit
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for the radius of the bounding circle.
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\param font Font used for painting the labels
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\return Calculated extent
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\sa setMinimumExtent(), minimumExtent()
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\warning The implemented algorithm is not too smart and
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calculates only an upper limit, that might be a
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few pixels too large
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*/
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double QwtRoundScaleDraw::extent( const QFont &font ) const
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{
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double d = 0.0;
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if ( hasComponent( QwtAbstractScaleDraw::Labels ) )
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{
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const QwtScaleDiv &sd = scaleDiv();
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const QList<double> &ticks = sd.ticks( QwtScaleDiv::MajorTick );
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for ( int i = 0; i < ticks.count(); i++ )
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{
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const double value = ticks[i];
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if ( !sd.contains( value ) )
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continue;
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const double tval = scaleMap().transform( value );
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if ( ( tval < d_data->startAngle + 360 )
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&& ( tval > d_data->startAngle - 360 ) )
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{
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const QwtText label = tickLabel( font, value );
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if ( label.isEmpty() )
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continue;
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const double arc = qwtRadians( tval );
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const QSizeF sz = label.textSize( font );
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const double off = qMax( sz.width(), sz.height() );
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double x = off * qSin( arc );
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double y = off * qCos( arc );
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const double dist = qSqrt( x * x + y * y );
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if ( dist > d )
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d = dist;
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}
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}
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}
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if ( hasComponent( QwtAbstractScaleDraw::Ticks ) )
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{
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d += maxTickLength();
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}
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if ( hasComponent( QwtAbstractScaleDraw::Backbone ) )
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{
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const double pw = qMax( 1, penWidth() ); // pen width can be zero
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d += pw;
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}
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if ( hasComponent( QwtAbstractScaleDraw::Labels ) &&
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( hasComponent( QwtAbstractScaleDraw::Ticks ) ||
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hasComponent( QwtAbstractScaleDraw::Backbone ) ) )
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{
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d += spacing();
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}
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d = qMax( d, minimumExtent() );
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return d;
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}
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