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/*
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* KmPlot - a math. function plotter for the KDE-Desktop
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*
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* Copyright (C) 1998, 1999 Klaus-Dieter M<>ler
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* 2000, 2002 kd.moeller@t-online.de
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*
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* This file is part of the KDE Project.
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* KmPlot is part of the KDE-EDU Project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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/** @file diagr.h
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* @brief Contains the CDiagr class. */
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#ifndef diagr_included
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#define diagr_included
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// standard includes
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#include <math.h>
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#include <stdio.h>
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// TQt includes
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#include <tqpainter.h>
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//@{
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/// Some abbreviations for horizontal and vertical lines.
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#define Line drawLine
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#define Lineh(x1, y, x2) drawLine(x1, y, x2, y)
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#define Linev(x, y1, y2) drawLine(x, y1, x, y2)
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//@}
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//@{
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/// Grid styles.
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#define GRID_NONE 0
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#define GRID_LINES 1
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#define GRID_CROSSES 2
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#define GRID_POLAR 3
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//@}
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/** @short This class manages the core drawing of the axes and the grid. */
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class CDiagr
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{
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public:
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/// Contructor. Members are set to initial values.
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///@see Create()
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CDiagr();
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/// Nothing to do for the destructor.
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~CDiagr();
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/// Sets all members to current values.
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void Create( TQPoint Ref,
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int lx, int ly,
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double xmin, double xmax,
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double ymin, double ymax );
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/// Sets the current values for the scaling factors
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void Skal( double ex, double ey );
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/// Draws all requested parts of the diagram (axes, labels, grid e.g.)
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void Plot( TQPainter* pDC );
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/// Returns the rectangle around the core of the plot area.
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TQRect GetPlotArea() { return PlotArea; }
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/// Returns the rectangle for the frame around the plot. Extra frame is bigger.
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TQRect GetFrame() { return m_frame; }
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/** @name Transformations */
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//@{
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/// These functions convert real coordinates to pixel coordinates and vice versa.
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int Transx(double);
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int Transy(double);
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double Transx(int);
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double Transy(int);
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//@}
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/** @name Style options
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* These members hold the current options for line widths and colors
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*/
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//@{
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TQRgb frameColor; ///< color of the border frame
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TQRgb axesColor; ///< color of the axes
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TQRgb gridColor; ///< color of the grid
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uint borderThickness, ///< current line width for the border frame
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axesLineWidth, ///< current line width for the axes
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gridLineWidth, ///< current line width for the grid
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ticWidth, ///< current line width for the tics
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ticLength, ///< current length of the tic lines
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//@}
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xclipflg, ///< clipflg is set to 1 if the plot is out of the plot aerea.
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yclipflg; ///< clipflg is set to 1 if the plot is out of the plot aerea.
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private:
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/// Draw the coordinate axes.
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void drawAxes(TQPainter*);
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/// Draw the grid.
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void drawGrid( TQPainter* );
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/// Write labels.
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void drawLabels(TQPainter*);
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/// Current grid style.
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int g_mode;
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//@{
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/// Plot range edge.
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double xmin, xmax, ymin, ymax;
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//@}
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//@{
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/// Clip boundage.
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double xmd, ymd;
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//@}
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//@{
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/// Axes tic distance.
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double ex, ey;
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//@}
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//@{
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///Position of the first tic.
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double tsx, tsy;
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//@}
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//@{
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/// Screen coordinates of the coordinate system origin.
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double ox, oy;
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//@}
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//@{
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/// Transformation factors.
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/// @see Skal
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double skx, sky;
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//@}
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TQRect PlotArea; ///< plot area
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TQRect m_frame; ///< frame around the plot
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};
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#endif // diagr_included
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