document: add background-colour property

Document::Document() :

    width({Unit::PX, 1200}),

    height({Unit::PX, 600}) {}

    height({Unit::PX, 600}),

    background_colour(Colour::fromRGB(1,1,1)) {}

ReturnCode buildDocument(

    const PropertyList& plist,

  static const ParserDefinitions pdefs = {

    {"width", std::bind(&parseMeasureProp, std::placeholders::_1, &doc->width)},

    {"height", std::bind(&parseMeasureProp, std::placeholders::_1, &doc->height)},

    {"background-colour", std::bind(&configure_colour, std::placeholders::_1, &doc->background_colour)},

  };

  if (auto rc = parseAll(plist, pdefs); !rc.isSuccess()) {

#pragma once

#include "utils/return_code.h"

#include "graphics/measure.h"

#include "graphics/colour.h"

#include "element.h"

namespace plotfx {

  MeasureTable measures;

  Measure width;

  Measure height;

  Colour background_colour;

  std::vector<ElementRef> roots;

};

      to_px(doc.measures, doc.height).value,

      doc.measures);

  frame.clear(Colour{1, 1, 1, 1});

  frame.clear(doc.background_colour);

  if (auto rc = renderElements(doc, &frame); !rc.isSuccess()) {

    printError(rc);

    return EXIT_FAILURE;

      <td><code><strong>height</strong></code></td>

      <td>Here be dragons</td>

    </tr>

    <tr>

      <td><code><strong>background-colour</strong></code></td>

      <td>Here be dragons</td>

    </tr>

  </tbody>

</table>

    height: <size>;

--

### background-colour

Lorem ipsum dolor sit amet.

    background-colour: <colour>;

## Examples

width: 1200px;

height: 600px;

background-colour: #000;

plot {

  series {

    xs: csv('tests/testdata/measurement.csv', 0);

    ys: csv('tests/testdata/measurement.csv', 2);

    colour: #06c;

  }

}