00001 /* -*- Mode: C++ -*- 00002 KDChart - a multi-platform charting engine 00003 */ 00004 00005 /**************************************************************************** 00006 ** Copyright (C) 2005-2007 Klarälvdalens Datakonsult AB. All rights reserved. 00007 ** 00008 ** This file is part of the KD Chart library. 00009 ** 00010 ** This file may be distributed and/or modified under the terms of the 00011 ** GNU General Public License version 2 as published by the Free Software 00012 ** Foundation and appearing in the file LICENSE.GPL included in the 00013 ** packaging of this file. 00014 ** 00015 ** Licensees holding valid commercial KD Chart licenses may use this file in 00016 ** accordance with the KD Chart Commercial License Agreement provided with 00017 ** the Software. 00018 ** 00019 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE 00020 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 00021 ** 00022 ** See http://www.kdab.net/kdchart for 00023 ** information about KD Chart Commercial License Agreements. 00024 ** 00025 ** Contact info@kdab.net if any conditions of this 00026 ** licensing are not clear to you. 00027 ** 00028 **********************************************************************/ 00029 00030 #ifndef KDCHARTTEXTLABELCACHE_H 00031 #define KDCHARTTEXTLABELCACHE_H 00032 00033 #include <QPixmap> 00034 00035 #include "KDChartEnums.h" 00036 00040 class PrerenderedElement { 00041 public: 00042 PrerenderedElement(); 00043 virtual ~PrerenderedElement() {} 00044 00048 virtual const QPixmap& pixmap() const = 0; 00049 00052 virtual QPointF referencePointLocation( KDChartEnums::PositionValue ) const = 0; 00053 00055 void setPosition( const QPointF& position ); 00057 const QPointF& position() const; 00058 00063 void setReferencePoint( KDChartEnums::PositionValue ); 00065 KDChartEnums::PositionValue referencePoint() const; 00066 00067 protected: 00074 virtual void invalidate() const = 0; 00075 00076 private: 00077 QPointF m_position; 00078 KDChartEnums::PositionValue m_referencePoint; 00079 }; 00080 00097 // FIXME this is merely a prototype 00098 // FIXME caching could be done by a second layer that can be used to, 00099 // e.g., query for a prerendered element by id or name, or by changing 00100 // the pixmap() method to do lazy evaluation. 00101 class PrerenderedLabel : public PrerenderedElement 00102 { 00103 public: 00104 PrerenderedLabel(); 00105 ~PrerenderedLabel(); 00106 00107 void setFont( const QFont& font ); 00108 const QFont& font() const; 00109 00110 void setText( const QString& text ); 00111 const QString& text() const; 00112 00113 void setBrush( const QBrush& brush ); 00114 const QBrush& brush() const; 00115 00116 void setPen( const QPen& ); 00117 const QPen& pen() const; 00118 00119 void setAngle( double angle ); 00120 double angle() const; 00121 00122 // reimpl PrerenderedElement: 00123 const QPixmap& pixmap() const; 00124 QPointF referencePointLocation( KDChartEnums::PositionValue position ) const; 00125 // overload: return location of referencePoint(): 00126 QPointF referencePointLocation() const; 00127 00128 protected: 00129 void invalidate() const; 00130 00131 private: 00135 void paint() const; 00136 00137 // store the settings (these are used for the painting): 00138 mutable bool m_dirty; 00139 QFont m_font; 00140 QString m_text; 00141 QBrush m_brush; 00142 QPen m_pen; 00143 double m_angle; 00144 00145 // these are valid once the label has been rendered: 00146 mutable QPixmap m_pixmap; 00147 mutable QPointF m_referenceBottomLeft; 00148 mutable QPointF m_textBaseLineVector; 00149 mutable QPointF m_textAscendVector; 00150 }; 00151 00152 #endif