1 files changed, 99 insertions, 0 deletions
diff --git a/app/qcheapruler.cpp b/app/qcheapruler.cpp
new file mode 100644
index 0000000..4e520d2
--- /dev/null
+++ b/app/qcheapruler.cpp
@@ -0,0 +1,99 @@
+#include "qcheapruler.hpp"
+
+#include <QString>
+
+double QCheapRuler::distance() const
+{
+    return m_distance;
+}
+
+double QCheapRuler::currentDistance() const
+{
+    return m_currentDistance;
+}
+
+void QCheapRuler::setCurrentDistance(double current)
+{
+    if (m_path.empty()) {
+        m_currentDistance = 0.;
+        m_currentPosition = QGeoCoordinate(0., 0.);
+        m_segmentIndex = 0;
+
+        return;
+    }
+
+    double currentDistance = qMin(qMax(0., current), distance());
+    if (m_currentDistance != currentDistance) {
+        m_currentDistance = currentDistance;
+        emit currentDistanceChanged();
+    }
+
+    cr::point c = ruler().along(m_path, m_currentDistance);
+    if (m_currentPosition != QGeoCoordinate(c.y, c.x)) {
+        m_currentPosition = QGeoCoordinate(c.y, c.x);
+        emit currentPositionChanged();
+    }
+
+    unsigned segmentIndex = ruler().pointOnLine(m_path, c).second;
+    if (m_segmentIndex != segmentIndex) {
+        m_segmentIndex = segmentIndex;
+        emit segmentIndexChanged();
+    }
+}
+
+QGeoCoordinate QCheapRuler::currentPosition() const
+{
+    return m_currentPosition;
+}
+
+unsigned QCheapRuler::segmentIndex() const
+{
+    return m_segmentIndex;
+}
+
+QJSValue QCheapRuler::path() const
+{
+    // Should neveer be called.
+    return QJSValue();
+}
+
+void QCheapRuler::setPath(const QJSValue &value)
+{
+    if (!value.isArray())
+        return;
+
+    m_path.clear();
+    quint32 length = value.property(QStringLiteral("length")).toUInt();
+
+    for (unsigned i = 0; i < length; ++i) {
+        auto property = value.property(i);
+        cr::point coordinate = { 0., 0. };
+
+        if (property.hasProperty(QStringLiteral("latitude")))
+            coordinate.y = property.property(QStringLiteral("latitude")).toNumber();
+
+        if (property.hasProperty(QStringLiteral("longitude")))
+            coordinate.x = property.property(QStringLiteral("longitude")).toNumber();
+
+        m_path.push_back(coordinate);
+    }
+
+    double distance = ruler().lineDistance(m_path);
+    if (m_distance != distance) {
+        m_distance = distance;
+        emit distanceChanged();
+    }
+
+    setCurrentDistance(0.);
+
+    emit pathChanged();
+}
+
+cr::CheapRuler QCheapRuler::ruler() const
+{
+    if (m_path.empty()) {
+        return cr::CheapRuler(0., cr::CheapRuler::Kilometers);
+    } else {
+        return cr::CheapRuler(m_currentPosition.latitude(), cr::CheapRuler::Kilometers);
+    }
+}