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annotate include/gui/widgets/graph.h @ 198:bc1ae1810855

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dep/animia: switch from using classes to global functions the old idea was ok, but sort of hackish; this method doesn't use classes at all, and this way (especially important!) we can do wayland stuff AND x11 at the same time, which wasn't really possible without stupid workarounds in the other method
author Paper <mrpapersonic@gmail.com>
date Sun, 24 Dec 2023 02:59:42 -0500
parents 45a0967485f1
children 862d0d8619f6
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1 #ifndef __gui__widgets__graph_h
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2 #define __gui__widgets__graph_h
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4 /* This class is defined as a template, so that means everything gets defined here as well :) */
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6 #include <QWidget>
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7 #include <QDebug>
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8 #include <QSize>
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9 #include <QPaintEvent>
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10 #include <QSize>
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11 #include <QRect>
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12 #include <QPainter>
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13 #include <QPainterPath>
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14 #include <QPen>
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15 #include <algorithm>
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16 #include <unordered_map>
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18 template<typename T>
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19 class Graph final : public QWidget {
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20 public:
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21 Graph(QWidget* parent = nullptr) : QWidget(parent) {};
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22 void AddItem(T key, unsigned long val) { map[key] = val; update(); updateGeometry(); };
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23 void Clear() { map.clear(); update(); updateGeometry(); };
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25 protected:
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26 std::unordered_map<T, unsigned long> map = {};
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27
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28 QSize minimumSizeHint() const override {
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29 QFontMetrics metric(font());
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30 /* wtf?... */
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31 return QSize(100, metric.height() * map.size() + (2 * (map.size() - 2)));
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32 }
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34 /* helper functions */
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35 inline unsigned long GetTotal() {
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36 unsigned long count = 0;
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38 for (const auto& item : map)
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39 count += item.second;
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41 return count;
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42 }
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43
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44 inline unsigned long GetTextWidth() {
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45 unsigned long ret = 0;
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46 QFontMetrics metric(font());
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47
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48 for (const auto& item : map) {
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49 unsigned long width = metric.horizontalAdvance(QString::number(item.first), -1);
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50 if (width > ret)
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51 ret = width;
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52 }
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54 return ret;
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55 }
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57 void paintEvent(QPaintEvent* event) override {
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58 static constexpr int HORIZ_SPACING = 5;
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59 static constexpr int VERT_SPACING = 2;
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60
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61 /* these are retrieved from the QPaintEvent */
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62 const QRect rect = event->rect();
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63 const int width = event->rect().width();
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64 const int x = rect.x();
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65 int y = rect.y();
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67 /* these are calculated from font metrics and such */
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68 const int total = GetTotal();
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69 const int text_width = GetTextWidth() + 10;
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70 const int each_height = QFontMetrics(font()).height();
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72 /* now we do the actual painting */
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73 QPainter painter(this);
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75 for (const auto& [key, value] : map) {
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76 painter.drawText(QRect(x, y, text_width, each_height), Qt::AlignVCenter, QString::number(key));
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78 /* only draw this if we actually have any data */
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79 if (total) {
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80 QPainterPath path;
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81 path.addRect(x + text_width + HORIZ_SPACING, y, (static_cast<double>(value)/total) * (width - text_width - HORIZ_SPACING), each_height);
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82 painter.fillPath(path, Qt::darkBlue);
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83 painter.drawPath(path);
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84 }
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86 y += each_height + VERT_SPACING;
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87 }
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88 }
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89 };
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91 #endif // __gui__widgets__graph_h