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#include "legend.h"
#include "xyplot.h"
#include "xypointset.h"
Legend::Legend()
: _sizeOfM(0.0),
_xBearing(0.0),
_yBearing(0.0),
_textAdvance(0.0),
_x(0.0),
_y(0.0),
_width(0.0),
_height(0.0) {}
void Legend::Initialize(const Cairo::RefPtr<Cairo::Context>& cairo,
const XYPlot& plot) {
_width = 0.0;
_height = 0.0;
_textAdvance = 0.0;
cairo->set_font_size(14);
Cairo::TextExtents extents;
cairo->get_text_extents("M", extents);
_sizeOfM = extents.width;
for (size_t i = 0; i != plot.PointSetCount(); ++i) {
const XYPointSet& pointSet = plot.GetPointSet(i);
const std::string& label = pointSet.Label();
cairo->get_text_extents(label, extents);
_width = std::max(_width, extents.width - extents.x_bearing);
_textAdvance = std::max(_textAdvance, extents.height);
if (i == 0) {
_yBearing = extents.y_bearing;
}
}
_width += _sizeOfM * 2.8;
_height = _textAdvance * (0.4 + plot.PointSetCount());
}
void Legend::Draw(const Cairo::RefPtr<Cairo::Context>& cairo,
const XYPlot& plot) const {
cairo->rectangle(_x, _y, _width, _height);
cairo->set_source_rgb(0.0, 0.0, 0.0);
cairo->stroke_preserve();
cairo->set_source_rgba(0.9, 0.9, 1.0, 0.5);
cairo->fill();
const double symbolLeft = _x + _sizeOfM * 0.4;
const double textLeft = _x + _sizeOfM * 1.8 - _xBearing;
double curY = _y - _yBearing + 0.2 * _textAdvance;
cairo->set_font_size(14);
cairo->set_line_width(2);
for (size_t i = 0; i != plot.PointSetCount(); ++i) {
const XYPointSet& pointSet = plot.GetPointSet(i);
const std::string& label = pointSet.Label();
cairo->set_source_rgb(0.0, 0.0, 0.0);
cairo->move_to(textLeft, curY);
cairo->show_text(label);
auto color = pointSet.GetColor();
cairo->set_source_rgba(color.r, color.g, color.b, color.a);
switch (pointSet.GetDrawingStyle()) {
case XYPointSet::DrawColumns:
cairo->rectangle(symbolLeft + 0.1 * _sizeOfM, curY - _textAdvance * 0.9,
0.9 * _sizeOfM, 0.9 * _sizeOfM);
cairo->fill();
break;
case XYPointSet::DrawLines:
cairo->move_to(symbolLeft, curY - _textAdvance * 0.5);
cairo->rel_line_to(_sizeOfM, 0.0);
cairo->stroke();
break;
case XYPointSet::DrawPoints:
cairo->move_to(symbolLeft + 2.0 + _sizeOfM * 0.5,
curY - _textAdvance - 0.5);
cairo->arc(symbolLeft + _sizeOfM * 0.5, curY - _textAdvance * 0.5, 2.0,
0.0, 2.0 * M_PI);
cairo->fill();
break;
}
curY += _textAdvance;
}
}
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