draw.c

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/* This file is part of the 'atomes' software
 
'atomes' is free software: you can redistribute it and/or modify it under the terms
of the GNU Affero General Public License as published by the Free Software Foundation,
either version 3 of the License, or (at your option) any later version.
 
'atomes' 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 Affero General Public License along with 'atomes'.
If not, see <https://www.gnu.org/licenses/>
 
Copyright (C) 2022-2024 by CNRS and University of Strasbourg */
 
/*
* This file: 'draw.c'
*
* Contains:
*
 
- The function to draw a curve
 
*
*/
 
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <stdlib.h>
#include <math.h>
#include <cairo.h>
 
#include "global.h"
#include "curve.h"
 
void draw_curve (cairo_t * cr,
                 int cid,
                 int rid,
                 project * this_proj,
                 int points,
                 ColRGBA withcolor,
                 int xscale,
                 int yscale,
                 int asp,
                 int vdash,
                 double thick,
                 int glyp,
                 double gize,
                 int freq,
                 double hwidth,
                 double hopac,
                 int hpos,
                 int extra,
                 int pid)
{
  int i, j, k;
  double x, y;
  double x1, x2, y1, y2;
  double dx1, dx2, dy1, dy2;
  double slope, bval;
  double ** plotdata;
  gboolean plot;
  gboolean dglyp;
  curve_dash * dasht;
 
  plotdata = allocddouble (points, 2);
  for ( i=0 ; i < points; i++ )
  {
    if (xscale == 0)
    {
      plotdata[i][0] = x_min + XDRAW * (this_proj -> curves[rid][cid] -> data[0][i] - cxy[0])/ xmax;
    }
    else
    {
      x = (i+1) * this_proj -> num_delta[rid] * this_proj -> delta[rid] * pow(10, dxlog);
      x = log(x) / log(pow(10, xlog));
      plotdata[i][0] = x_min + XDRAW * x;
    }
    if (yscale == 0)
    {
      plotdata[i][1] = y_min + YDRAW * (this_proj -> curves[rid][cid] -> data[1][i] - cxy[1]) / ymax;
    }
    else
    {
      y = this_proj -> curves[rid][cid] -> data[1][i] * pow(10, dylog);
      y = log(y) / log(pow(10, ylog));
      plotdata[i][1] = y_min + YDRAW * y;
    }
#ifdef DEBUG
    // g_debug ("CURVE: DRAWCURVE: x= %f, y= %f", plotdata[i][0], plotdata[i][1]);
#endif
  }
  if (vdash > 0)
  {
    dasht = selectdash (vdash);
    cairo_set_dash(cr, dasht -> a, dasht -> b, 0.0);
    cairo_set_line_width (cr, thick);
    g_free (dasht);
  }
  else
  {
    cairo_set_line_width (cr, 0.0);
  }
  cairo_set_source_rgba (cr, withcolor.red,
                             withcolor.green,
                             withcolor.blue, 1.0);
 
  if (asp == 0)
  {
    j = 0;
    k = 1;
    if (rid == RI) j = 2;
    for ( i = j ; i < points - k ; i ++)
    {
      plot = TRUE;
      dglyp = FALSE;
      slope = (plotdata[i+k][1] - plotdata[i][1])/ (plotdata[i+k][0] - plotdata[i][0]);
      bval = plotdata[i][1] - slope*plotdata[i][0];
      dy1 = slope*x_min + bval;
      dy2 = slope*x_max + bval;
      if (slope < 0)
      {
        dx1 = (y_min - bval) / slope;
        dx2 = (y_max - bval) / slope;
      }
      else
      {
        dx1 = (y_max - bval) / slope;
        dx2 = (y_min - bval) / slope;
      }
      if (plotdata[i][0] < x_min && plotdata[i+k][0] < x_min)
      {
        plot = FALSE;
      }
      else if (plotdata[i][0] > x_max && plotdata[i+k][0] > x_max)
      {
        plot = FALSE;
      }
      if (plotdata[i][1] < y_max && plotdata[i+k][1] < y_max)
      {
        plot = FALSE;
      }
      else if (plotdata[i][1] > y_min && plotdata[i+k][1] > y_min)
      {
        plot = FALSE;
      }
      if (plot)
      {
        if (plotdata[i][0] >= x_min && plotdata[i][0] <= x_max)
        {
          if(plotdata[i][1] >= y_max && plotdata[i][1] <= y_min)
          {
            x1 = plotdata[i][0];
            y1 = plotdata[i][1];
            dglyp = TRUE;
          }
          else
          {
            x1 = dx1;
            y1 = (slope < 0) ? y_min : y_max;
          }
        }
        else
        {
          x1 = x_min;
          y1 = dy1;
        }
        if (plotdata[i+k][0] >= x_min && plotdata[i+k][0] <= x_max)
        {
          if (plotdata[i+k][1] >= y_max && plotdata[i+k][1] <= y_min)
          {
            x2 = plotdata[i+k][0];
            y2 = plotdata[i+k][1];
          }
          else
          {
            x2 = dx2;
            y2 = (slope < 0) ? y_max : y_min;
          }
        }
        else
        {
          x2 = x_max;
          y2 = dy2;
        }
        cairo_move_to (cr, x1, y1);
        cairo_line_to (cr, x2, y2);
        cairo_stroke (cr);
        if (i % freq == 0 && dglyp) draw_glyph (cr, glyp, x1, y1, withcolor, gize);
        if (i == points - 2 && (i+k) % freq == 0 && dglyp)
        {
          draw_glyph (cr, glyp, x2, y2, withcolor, gize);
        }
      }
    }
  }
  else if (asp == 1)
  {
    j = 0;
    k = 1;
    if (rid == RI) j = 2;
    // g_debug ("x_min= %f, x_max= %f, y_min= %f, y_max= %f", x_min, x_max, y_min, y_max);
    for ( i = j ; i < points ; i ++)
    {
      if (this_proj -> curves[rid][cid] -> data[1][i] != 0.0)
      {
        if (plotdata[i][0] >= x_min && plotdata[i][0] <= x_max)
        {
          if (plotdata[i][1] <= y_min || (cxy[1] <= 0.0 && plotdata[i][1] > y_min))
          {
            x1 = plotdata[i][0] - hwidth * 0.5 * XDRAW / xmax;
            if (pid) x1 -= hwidth * 0.5 * ((float)pid / (float)extra) * XDRAW / xmax;
            x2 = hwidth * XDRAW / xmax;
            if (x1 < x_min)
            {
              x2 -= (x_min - x1);
              x1 = x_min;
            }
            if (x1+x2 > x_max)
            {
              x2 = x_max - x1;
            }
            y1 = plotdata[i][1];
            if (plotdata[i][1] > y_min)
            {
              y1 = y_min;
            }
            else if (plotdata[i][1] < y_max)
            {
              y1 = y_max;
            }
            y2 =  y_min - y1;
            if (cxy[1] <= 0.0)
            {
              y2 = y2 - cxy[1] * YDRAW / ymax;
            }
            if (hpos)
            {
              cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 1.0);
              cairo_rectangle (cr, x1, y1, x2, y2);
              cairo_fill(cr);
            }
            cairo_set_source_rgba (cr, withcolor.red,
                                       withcolor.green,
                                       withcolor.blue, hopac);
            cairo_rectangle (cr, x1, y1, x2, y2);
            cairo_fill(cr);
            cairo_set_source_rgba (cr, withcolor.red,
                                       withcolor.green,
                                       withcolor.blue, 1.0);
            y2 = y_min;
            if (cxy[1] <= 0.0)
            {
              y2 = y2 - cxy[1] * YDRAW / ymax;
            }
            cairo_move_to (cr, x1, y2);
            cairo_line_to (cr, x1, y1);
            cairo_move_to (cr, x1, y1);
            x2 = plotdata[i][0] + hwidth * 0.5 * XDRAW / xmax;
            if (pid) x2 -= hwidth * 0.5 * ((float)pid / (float)extra) * XDRAW / xmax;
            if (x2 > x_max)
            {
              x2 = x_max;
              cairo_line_to(cr, x2, y1);
              cairo_move_to(cr, x2, y1);
            }
            else
            {
              cairo_line_to(cr, x2, y1);
              cairo_move_to(cr, x2, y1);
              cairo_line_to(cr, x2, y2);
            }
            cairo_stroke(cr);
          }
        }
      }
    }
  }
  cairo_stroke(cr);
  g_free (plotdata);
}