441 lines
11 KiB
C++
441 lines
11 KiB
C++
/* -*- 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_dial_needle.h"
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#include "qwt_global.h"
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#include "qwt_math.h"
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#include "qwt_painter.h"
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#include <qapplication.h>
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#include <qpainter.h>
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#include <QPainterPath>
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#if QT_VERSION < 0x040601
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#define qFastSin(x) qSin(x)
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#define qFastCos(x) qCos(x)
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#endif
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static void qwtDrawStyle1Needle( QPainter *painter,
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const QPalette &palette, QPalette::ColorGroup colorGroup,
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double length )
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{
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const double r[] = { 0.4, 0.3, 1, 0.8, 1, 0.3, 0.4 };
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const double a[] = { -45, -20, -15, 0, 15, 20, 45 };
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QPainterPath path;
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for ( int i = 0; i < 7; i++ )
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{
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const double angle = a[i] / 180.0 * M_PI;
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const double radius = r[i] * length;
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const double x = radius * qFastCos( angle );
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const double y = radius * qFastSin( angle );
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path.lineTo( x, -y );
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}
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painter->setPen( Qt::NoPen );
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painter->setBrush( palette.brush( colorGroup, QPalette::Light ) );
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painter->drawPath( path );
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}
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static void qwtDrawStyle2Needle( QPainter *painter,
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const QPalette &palette, QPalette::ColorGroup colorGroup, double length )
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{
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const double ratioX = 0.7;
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const double ratioY = 0.3;
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QPainterPath path1;
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path1.lineTo( ratioX * length, 0.0 );
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path1.lineTo( length, ratioY * length );
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QPainterPath path2;
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path2.lineTo( ratioX * length, 0.0 );
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path2.lineTo( length, -ratioY * length );
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painter->setPen( Qt::NoPen );
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painter->setBrush( palette.brush( colorGroup, QPalette::Light ) );
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painter->drawPath( path1 );
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painter->setBrush( palette.brush( colorGroup, QPalette::Dark ) );
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painter->drawPath( path2 );
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}
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static void qwtDrawShadedPointer( QPainter *painter,
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const QColor &lightColor, const QColor &darkColor,
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double length, double width )
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{
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const double peak = qMax( length / 10.0, 5.0 );
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const double knobWidth = width + 8;
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QRectF knobRect( 0, 0, knobWidth, knobWidth );
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knobRect.moveCenter( QPointF(0, 0) );
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QPainterPath path1;
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path1.lineTo( 0.0, 0.5 * width );
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path1.lineTo( length - peak, 0.5 * width );
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path1.lineTo( length, 0.0 );
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path1.lineTo( 0.0, 0.0 );
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QPainterPath arcPath1;
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arcPath1.arcTo( knobRect, 0.0, -90.0 );
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path1 = path1.united( arcPath1 );
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QPainterPath path2;
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path2.lineTo( 0.0, -0.5 * width );
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path2.lineTo( length - peak, -0.5 * width );
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path2.lineTo( length, 0.0 );
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path2.lineTo( 0.0, 0.0 );
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QPainterPath arcPath2;
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arcPath2.arcTo( knobRect, 0.0, 90.0 );
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path2 = path2.united( arcPath2 );
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painter->setPen( Qt::NoPen );
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painter->setBrush( lightColor );
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painter->drawPath( path1 );
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painter->setBrush( darkColor );
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painter->drawPath( path2 );
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}
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static void qwtDrawArrowNeedle( QPainter *painter,
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const QPalette &palette, QPalette::ColorGroup colorGroup,
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double length, double width )
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{
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if ( width <= 0 )
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width = qMax( length * 0.06, 9.0 );
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const double peak = qMax( 2.0, 0.4 * width );
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QPainterPath path;
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path.moveTo( 0.0, 0.5 * width );
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path.lineTo( length - peak, 0.3 * width );
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path.lineTo( length, 0.0 );
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path.lineTo( length - peak, -0.3 * width );
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path.lineTo( 0.0, -0.5 * width );
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QRectF br = path.boundingRect();
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QPalette pal( palette.color( QPalette::Mid ) );
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QColor c1 = pal.color( QPalette::Light );
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QColor c2 = pal.color( QPalette::Dark );
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QLinearGradient gradient( br.topLeft(), br.bottomLeft() );
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gradient.setColorAt( 0.0, c1 );
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gradient.setColorAt( 0.5, c1 );
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gradient.setColorAt( 0.5001, c2 );
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gradient.setColorAt( 1.0, c2 );
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QPen pen( gradient, 1 );
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pen.setJoinStyle( Qt::MiterJoin );
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painter->setPen( pen );
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painter->setBrush( palette.brush( colorGroup, QPalette::Mid ) );
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painter->drawPath( path );
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}
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static void qwtDrawTriangleNeedle( QPainter *painter,
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const QPalette &palette, QPalette::ColorGroup colorGroup,
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double length )
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{
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const double width = qRound( length / 3.0 );
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QPainterPath path[4];
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path[0].lineTo( length, 0.0 );
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path[0].lineTo( 0.0, width / 2 );
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path[1].lineTo( length, 0.0 );
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path[1].lineTo( 0.0, -width / 2 );
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path[2].lineTo( -length, 0.0 );
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path[2].lineTo( 0.0, width / 2 );
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path[3].lineTo( -length, 0.0 );
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path[3].lineTo( 0.0, -width / 2 );
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const int colorOffset = 10;
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const QColor darkColor = palette.color( colorGroup, QPalette::Dark );
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const QColor lightColor = palette.color( colorGroup, QPalette::Light );
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QColor color[4];
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color[0] = darkColor.light( 100 + colorOffset );
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color[1] = darkColor.dark( 100 + colorOffset );
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color[2] = lightColor.light( 100 + colorOffset );
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color[3] = lightColor.dark( 100 + colorOffset );
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painter->setPen( Qt::NoPen );
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for ( int i = 0; i < 4; i++ )
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{
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painter->setBrush( color[i] );
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painter->drawPath( path[i] );
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}
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}
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//! Constructor
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QwtDialNeedle::QwtDialNeedle():
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d_palette( QApplication::palette() )
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{
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}
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//! Destructor
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QwtDialNeedle::~QwtDialNeedle()
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{
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}
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/*!
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Sets the palette for the needle.
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\param palette New Palette
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*/
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void QwtDialNeedle::setPalette( const QPalette &palette )
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{
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d_palette = palette;
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}
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/*!
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\return the palette of the needle.
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*/
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const QPalette &QwtDialNeedle::palette() const
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{
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return d_palette;
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}
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/*!
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Draw the needle
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\param painter Painter
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\param center Center of the dial, start position for the needle
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\param length Length of the needle
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\param direction Direction of the needle, in degrees counter clockwise
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\param colorGroup Color group, used for painting
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*/
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void QwtDialNeedle::draw( QPainter *painter,
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const QPointF ¢er, double length, double direction,
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QPalette::ColorGroup colorGroup ) const
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{
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painter->save();
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painter->translate( center );
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painter->rotate( -direction );
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drawNeedle( painter, length, colorGroup );
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painter->restore();
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}
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//! Draw the knob
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void QwtDialNeedle::drawKnob( QPainter *painter,
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double width, const QBrush &brush, bool sunken ) const
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{
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QPalette palette( brush.color() );
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QColor c1 = palette.color( QPalette::Light );
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QColor c2 = palette.color( QPalette::Dark );
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if ( sunken )
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qSwap( c1, c2 );
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QRectF rect( 0.0, 0.0, width, width );
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rect.moveCenter( painter->combinedTransform().map( QPointF() ) );
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QLinearGradient gradient( rect.topLeft(), rect.bottomRight() );
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gradient.setColorAt( 0.0, c1 );
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gradient.setColorAt( 0.3, c1 );
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gradient.setColorAt( 0.7, c2 );
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gradient.setColorAt( 1.0, c2 );
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painter->save();
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painter->resetTransform();
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painter->setPen( QPen( gradient, 1 ) );
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painter->setBrush( brush );
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painter->drawEllipse( rect );
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painter->restore();
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}
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/*!
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Constructor
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\param style Style
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\param hasKnob With/Without knob
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\param mid Middle color
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\param base Base color
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*/
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QwtDialSimpleNeedle::QwtDialSimpleNeedle( Style style, bool hasKnob,
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const QColor &mid, const QColor &base ):
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d_style( style ),
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d_hasKnob( hasKnob ),
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d_width( -1 )
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{
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QPalette palette;
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palette.setColor( QPalette::Mid, mid );
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palette.setColor( QPalette::Base, base );
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setPalette( palette );
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}
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/*!
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Set the width of the needle
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\param width Width
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\sa width()
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*/
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void QwtDialSimpleNeedle::setWidth( double width )
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{
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d_width = width;
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}
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/*!
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\return the width of the needle
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\sa setWidth()
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*/
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double QwtDialSimpleNeedle::width() const
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{
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return d_width;
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}
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/*!
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Draw the needle
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\param painter Painter
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\param length Length of the needle
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\param colorGroup Color group, used for painting
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*/
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void QwtDialSimpleNeedle::drawNeedle( QPainter *painter,
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double length, QPalette::ColorGroup colorGroup ) const
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{
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double knobWidth = 0.0;
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double width = d_width;
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if ( d_style == Arrow )
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{
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if ( width <= 0.0 )
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width = qMax(length * 0.06, 6.0);
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qwtDrawArrowNeedle( painter,
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palette(), colorGroup, length, width );
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knobWidth = qMin( width * 2.0, 0.2 * length );
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}
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else
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{
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if ( width <= 0.0 )
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width = 5.0;
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QPen pen ( palette().brush( colorGroup, QPalette::Mid ), width );
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pen.setCapStyle( Qt::FlatCap );
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painter->setPen( pen );
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painter->drawLine( QPointF( 0.0, 0.0 ), QPointF( length, 0.0 ) );
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knobWidth = qMax( width * 3.0, 5.0 );
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}
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if ( d_hasKnob && knobWidth > 0.0 )
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{
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drawKnob( painter, knobWidth,
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palette().brush( colorGroup, QPalette::Base ), false );
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}
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}
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//! Constructor
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QwtCompassMagnetNeedle::QwtCompassMagnetNeedle( Style style,
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const QColor &light, const QColor &dark ):
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d_style( style )
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{
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QPalette palette;
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palette.setColor( QPalette::Light, light );
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palette.setColor( QPalette::Dark, dark );
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palette.setColor( QPalette::Base, Qt::gray );
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setPalette( palette );
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}
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/*!
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Draw the needle
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\param painter Painter
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\param length Length of the needle
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\param colorGroup Color group, used for painting
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*/
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void QwtCompassMagnetNeedle::drawNeedle( QPainter *painter,
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double length, QPalette::ColorGroup colorGroup ) const
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{
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if ( d_style == ThinStyle )
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{
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const double width = qMax( length / 6.0, 3.0 );
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const int colorOffset = 10;
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const QColor light = palette().color( colorGroup, QPalette::Light );
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const QColor dark = palette().color( colorGroup, QPalette::Dark );
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qwtDrawShadedPointer( painter,
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dark.light( 100 + colorOffset ),
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dark.dark( 100 + colorOffset ),
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length, width );
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painter->rotate( 180.0 );
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qwtDrawShadedPointer( painter,
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light.light( 100 + colorOffset ),
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light.dark( 100 + colorOffset ),
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length, width );
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const QBrush baseBrush = palette().brush( colorGroup, QPalette::Base );
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drawKnob( painter, width, baseBrush, true );
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}
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else
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{
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qwtDrawTriangleNeedle( painter, palette(), colorGroup, length );
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}
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}
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/*!
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Constructor
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\param style Arrow style
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\param light Light color
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\param dark Dark color
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*/
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QwtCompassWindArrow::QwtCompassWindArrow( Style style,
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const QColor &light, const QColor &dark ):
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d_style( style )
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{
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QPalette palette;
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palette.setColor( QPalette::Light, light );
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palette.setColor( QPalette::Dark, dark );
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setPalette( palette );
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}
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/*!
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Draw the needle
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\param painter Painter
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\param length Length of the needle
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\param colorGroup Color group, used for painting
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*/
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void QwtCompassWindArrow::drawNeedle( QPainter *painter,
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double length, QPalette::ColorGroup colorGroup ) const
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{
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if ( d_style == Style1 )
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qwtDrawStyle1Needle( painter, palette(), colorGroup, length );
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else
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qwtDrawStyle2Needle( painter, palette(), colorGroup, length );
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}
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