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sxy_task_zoomin.cpp

Go to the documentation of this file.

// =======================================================================

char *task_zoomin_cpp = "$Id: sxy_task_zoomin.cpp,v 1.2 2002/11/26 21:00:37 clinio Exp $";

// =======================================================================

#include <assert.h>
#include <xy.h>

extern "C" {
#include <iup.h>
#include <iupgc.h>
#include <cd.h>
}

#include "sxy_chart.h"
#include "sxy_graph.h"
#include "sxy_task.h"
#include "sxy_task_zoomin.h"

// =======================================================================

SXYTaskReturn SXYTaskZoomIn::mouseClick(SXYGraph* graph, int b, int x, int y, 
int sft, int ctr) {
  Ihandle* iup_canvas = graph->getIupCanvas();

  if (b != 1 || !sft) {
     is_doing = 0;
     IupSetAttribute( iup_canvas, IUP_CURSOR, IUP_ARROW );
     return CALLBACK_NOT_TREATED;
  }

  int ncht = graph->getChartOfEvent(x,y);
  if ( ncht < 0 ) return CALLBACK_NOT_TREATED;
  SXYChart* chart = graph->getChart(ncht);
  userchart = chart;
  is_doing = 1;
  ref_x = x; ref_y = y;
  shift_x = 0; shift_y = 0;
  drawFence();
  IupSetAttribute( iup_canvas, IUP_CURSOR, IUP_CROSS );
  return CALLBACK_TREATED;

  return CALLBACK_NOT_TREATED;
}

// ......................................................................

SXYTaskReturn SXYTaskZoomIn::mouseUnclick(SXYGraph* graph, int b, int x, int y, 
int sft, int ctr) {
  if ( !is_doing ) return CALLBACK_NOT_TREATED;
  if ( !userchart ) return CALLBACK_NOT_TREATED;
  if ( b != 1 ) return CALLBACK_NOT_TREATED;

  int cht = graph->getChartOfEvent(x, y);
  if (cht < 0) return CALLBACK_NOT_TREATED;

  drawFence();
  SXYTaskReturn answer = makeZoom( graph, userchart, 
        ref_x, shift_x, ref_y, shift_y );

  shift_x = 0; shift_y = 0;
  ref_x = x; ref_y = y;

  Ihandle* iup_canvas = graph->getIupCanvas();
  IupSetAttribute( iup_canvas, IUP_CURSOR, IUP_ARROW );
  is_doing = 0;

  userchart = NULL;
  graph->redrawGraph();
  return answer;
}

// ......................................................................

SXYTaskReturn SXYTaskZoomIn::mouseMotion(SXYGraph* graph, int x, int y, 
int sft, int ctr) {
  if ( !is_doing ) return CALLBACK_NOT_TREATED;
  int cht = graph->getChartOfEvent(x, y);
  if (cht < 0) return CALLBACK_NOT_TREATED;

  drawFence();
  shift_x = x - ref_x;
  shift_y = y - ref_y;
  drawFence();

  return CALLBACK_TREATED;
}

// ......................................................................

SXYTaskReturn SXYTaskZoomIn::mouseEnter(SXYGraph* graph) {
   Ihandle* iup_canvas = graph->getIupCanvas();
   IupSetAttribute( iup_canvas, IUP_CURSOR, IUP_ARROW );

   is_doing = 0;
   graph->redrawGraph();
   return CALLBACK_NOT_TREATED;
}

// ......................................................................

SXYTaskReturn SXYTaskZoomIn::mouseLeave(SXYGraph* graph) {
   Ihandle* iup_canvas = graph->getIupCanvas();
   IupSetAttribute( iup_canvas, IUP_CURSOR, IUP_ARROW );

   is_doing = 0;
   graph->redrawGraph();
   return CALLBACK_NOT_TREATED;
}

// ......................................................................

void SXYTaskZoomIn::drawFence(void) {
   int old_write_mode = cdWriteMode( CD_NOT_XOR );
   long int old_color = cdForeground( getXorColor() );

   int xmin, xmax, ymin, ymax;
   if ( shift_x > 0 ) { xmin = ref_x; xmax = ref_x + shift_x; }
   else { xmax = ref_x; xmin = ref_x + shift_x; }

   if ( shift_y > 0 ) { ymin = ref_y; ymax = ref_y + shift_y; }
   else { ymax = ref_y; ymin = ref_y + shift_y; }

   cdRect( xmin, xmax, ymin, ymax );

   cdWriteMode( old_write_mode );
   cdForeground( old_color );
}

// ......................................................................

static void zoom(SXYAxis *axis, double min, double max) {
   if(min > max)
   {
     double tmp = max;
     max = min;
     min = tmp;
   }
   axis->setScales( min, max );
   axis->tryScalesAdjust();
   axis->tryStepAdjust();
   axis->calcPrecision();
}

// ......................................................................

SXYTaskReturn SXYTaskZoomIn::makeZoom( SXYGraph* graph, SXYChart* chart,
int x, int dx, int y, int dy ) {
   double min, max;
   SXYAxis* a;

   for (unsigned int nh = 0; nh < chart->getNumAxes(HORIZONTAL_AXIS); nh++ ) {
     a = chart->getAxis( HORIZONTAL_AXIS, nh );
     if (dx != 0) {
       min = a->getPositionValue(x);
       max = a->getPositionValue(x+dx);
       zoom(a, min, max);
     }
   }

   for (unsigned int nv = 0; nv < chart->getNumAxes(VERTICAL_AXIS); nv++ ) {
      a = chart->getAxis(VERTICAL_AXIS, nv );
      if (dy != 0) {
        min = a->getPositionValue(y);
        max = a->getPositionValue(y+dy);
        zoom(a, min, max);
      }
   }

   chart->tryGridAdjust();
   return CALLBACK_TREATED;
}

// ......................................................................

SXYTaskZoomIn::SXYTaskZoomIn() {
   is_doing = 0;
   userchart = NULL;
   ref_x = ref_y = 0;
   shift_x = shift_y = 0;
}

// ......................................................................

SXYTaskZoomIn::~SXYTaskZoomIn() {
}

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SXY
Tecgraf / PUC-Rio - Computer Graphics Technology Group