#ifndef TOOLMAPZOOM_H
#define TOOLMAPZOOM_H

#include "Tool.h"
#include "../MapView2D.h"

/**
 * this tool allows zooming in and out of the map
 */
class ToolMapZoom : public Tool {

	float startScale = NAN;

public:

	const std::string getName() const override {
		return "MapZoom";
	}

	virtual bool wheelEvent(MapView2D* m, QWheelEvent* e) override {

		Scaler& s = m->getScaler();

		if (e->delta() < 0) {
			s.setScale(s.getScale() * 0.75);
		} else {
			s.setScale(s.getScale() / 0.75);
		}

		if (s.getScale() > 1000) {s.setScale(1000);}
		if (s.getScale() < 5) {s.setScale(5);}

		return true;

	}

	virtual bool pinchTriggered(MapView2D *m, QPinchGesture* g) override {

		Scaler& s = m->getScaler();
		// https://doc.qt.io/qt-5/qtwidgets-gestures-imagegestures-example.html

		QPinchGesture::ChangeFlags changeFlags = g->changeFlags();
		if (changeFlags & QPinchGesture::RotationAngleChanged) {
//				qreal rotationDelta = gesture->rotationAngle() - gesture->lastRotationAngle();
//				rotationAngle += rotationDelta;
//				qCDebug(lcExample) << "pinchTriggered(): rotate by" <<
//					rotationDelta << "->" << rotationAngle;
		}
		if (changeFlags & QPinchGesture::ScaleFactorChanged) {
			if (startScale != startScale) {startScale = s.getScale();}
			s.setScale(startScale * g->totalScaleFactor());
		}
		if (g->state() == Qt::GestureFinished) {
			startScale = NAN;
		}

		if (s.getScale() > 1000) {s.setScale(1000);}
		if (s.getScale() < 5) {s.setScale(5);}

		return true;


	}

};

#endif // TOOLMAPZOOM_H