--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/hhtracer/tracer.h	Fri Jan 10 17:37:34 2025 +0100
@@ -0,0 +1,70 @@
+#pragma once
+
+#include <QObject>
+#include <QPainter>
+#include <QQmlEngine>
+#include <QTemporaryDir>
+
+enum PrimitiveType { Polygon, Circle };
+
+struct Primitive {
+  PrimitiveType type;
+  QPen pen;
+  QBrush brush;
+  QPointF origin;
+  QList<QPointF> points;                    // polygon
+  double radius1{}, radius2{}, rotation{};  // ellipse
+
+  explicit Primitive(QSizeF size, const QList<QColor>& palette);
+  double cost() const;
+};
+
+struct Solution {
+  QList<Primitive> primitives;
+  double fitness;
+  QSizeF size;
+
+  explicit Solution(QSizeF size, const QList<QColor>& palette);
+  void calculateFitness(const QImage& image);
+  void render(const QString& fileName) const;
+  double cost() const;
+};
+
+class Tracer : public QObject {
+  Q_OBJECT
+  QML_ELEMENT
+
+  Q_PROPERTY(QList<QColor> palette READ palette WRITE setPalette NOTIFY
+                 paletteChanged FINAL)
+  Q_PROPERTY(
+      double bestSolution READ bestSolution NOTIFY bestSolutionChanged FINAL)
+  Q_PROPERTY(QStringList solutions READ solutions NOTIFY solutionsChanged FINAL)
+
+ public:
+  explicit Tracer(QObject *parent = nullptr);
+
+  QList<QColor> palette() const;
+  void setPalette(const QList<QColor>& newPalette);
+
+  double bestSolution() const;
+
+  Q_INVOKABLE void start(const QString& fileName);
+  Q_INVOKABLE void step();
+
+  QStringList solutions() const;
+
+ Q_SIGNALS:
+  void paletteChanged();
+  void bestSolutionChanged();
+  void solutionsChanged();
+
+ private:
+  QList<QColor> palette_;
+  double bestSolution_;
+  QStringList solutions_;
+  QList<Solution> generation_;
+  QTemporaryDir tempDir_;
+  QImage image_;
+
+  QString newFileName();
+};