GraphWidget.cc

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/*

    Widget for drawing graphs in realtime
    Copyright (C) 2003 Jussi Laako

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/


#include <gdk/gdk.h>
#include <gtk/gtk.h>

#include "GraphWidget.hh"


void clGraphWidget::MapToDisplay (int *ipDisplayX, int *ipDisplayY,
    double dGraphX, double dGraphY)
{
    double dXScale;
    double dYScale;
    
    dXScale = (double) lGraphWidth / dXRange;
    dYScale = (double) lGraphHeight / dYRange;
    *ipDisplayX = lMarginLeft + 
        (long) (dGraphX * dXScale + dXLeft + 0.5);
    *ipDisplayY = lMarginTop + (lHeight - lMarginBottom -
        (long) (dGraphY * dYScale + dYBottom + 0.5));
}


clGraphWidget::clGraphWidget ()
{
    lMarginTop = GRAPHWIDGET_MARGIN_TOP;
    lMarginLeft = GRAPHWIDGET_MARGIN_LEFT;
    lMarginBottom = GRAPHWIDGET_MARGIN_BOTTOM;
    lMarginRight = GRAPHWIDGET_MARGIN_RIGHT;

    gwParent = NULL;
    gwDrawingArea = NULL;
}


clGraphWidget::~clGraphWidget ()
{
}


GtkWidget * clGraphWidget::Create (GtkWidget *gwParentP)
{
    gwParent = gwParentP;
    gwDrawingArea = gtk_drawing_area_new();
    gtk_widget_show(gwDrawingArea);
    
    return gwDrawingArea;
}


void clGraphWidget::SetSize (int iWidthP, int iHeightP)
{
    lWidth = (iWidthP > (lMarginLeft + lMarginRight)) ? 
        iWidthP : (lMarginLeft + lMarginRight);
    lHeight = (iHeightP > (lMarginTop + lMarginBottom)) ?
        iHeightP : (lMarginTop + lMarginBottom);
    gtk_drawing_area_set_size(GTK_DRAWING_AREA(gwDrawingArea), 
        iWidth, iHeight);

    lGraphWidth = lWidth - lMarginLeft - lMarginRight;
    lGraphHeight = lHeight - lMarginTop - lMarginBottom;
}

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