a60-svg-graphs-bar.h

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// alpha60 bar graphs/charts -*- mode: C++ -*-
 
// alpha60
// bittorrent x scrape x data + analytics
 
// Copyright (c) 2020-2021, 2025 Benjamin De Kosnik <b.dekosnik@gmail.com>
 
// This file is part of the alpha60 library.  This library 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 3, or (at your option) any later
// version.
 
// This library 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.
 
#ifndef a60_SVG_BAR_GRAPHS_H
#define a60_SVG_BAR_GRAPHS_H 1
 
 
namespace svg {
 
//// Distance between center and top/bottom block
const double ctopspace(60);
 
/// Distance between label and top/bottom of line or text
const double ltopspace(10);
 
// Type sizes.
const auto lsz = 16; // large bold
const auto asz = 12; // sub headings
const auto ssz = 10; // sub sub headings
 
/// Compute xoffset.
uint
get_xoffset(const string& id, const uint xstart, const double hspace)
{ return xstart + (k::age_value_to_multiple(id, true) * hspace); };
 
using id_size = ulong;
using umids = std::unordered_map<string, id_size>;
using vumids = std::vector<umids>;
 
svg_element  
make_bar_graph(umids agesvo, const area<> a = svg::k::v1080p_h,
           const double yscale = 0.7, const uint rwidth = 10)
{
    // Vector of total age_value counts per decile for birth ages.
  vul vsum(k::age_values.size(), 0);
  for (const auto& val : agesvo)
    {
      auto [ id, count ] = val;
      uint xoff = get_xoffset(id, xstart, hspace);
 
      // rect
      double rheight = scale_value_on_range(count, 1, maxn, 10, ydelta);
      double rystart = voffstart - (rheight / 2);
      point_to_rect_centered(obj, std::make_tuple(xoff, rystart),
                 get_metadata_style(), rwidth, rheight);
 
      // text
      sized_text(obj, typov, asz, to_string(count), xoff,
         voffstart - rheight - ltopspace);
}
 
 
} // namepace a60::metadata
 
#endif