68 lines
1.5 KiB
C++
68 lines
1.5 KiB
C++
#ifndef TOOLMAPZOOM_H
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#define TOOLMAPZOOM_H
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#include "Tool.h"
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#include "../MapView2D.h"
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/**
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* this tool allows zooming in and out of the map
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*/
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class ToolMapZoom : public Tool {
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float startScale = NAN;
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public:
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const std::string getName() const override {
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return "MapZoom";
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}
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virtual bool wheelEvent(MapView2D* m, QWheelEvent* e) override {
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Scaler& s = m->getScaler();
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if (e->delta() < 0) {
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s.setScale(s.getScale() * 0.75);
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} else {
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s.setScale(s.getScale() / 0.75);
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}
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if (s.getScale() > 1000) {s.setScale(1000);}
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if (s.getScale() < 5) {s.setScale(5);}
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return true;
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}
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virtual bool pinchTriggered(MapView2D *m, QPinchGesture* g) override {
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Scaler& s = m->getScaler();
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// https://doc.qt.io/qt-5/qtwidgets-gestures-imagegestures-example.html
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QPinchGesture::ChangeFlags changeFlags = g->changeFlags();
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if (changeFlags & QPinchGesture::RotationAngleChanged) {
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// qreal rotationDelta = gesture->rotationAngle() - gesture->lastRotationAngle();
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// rotationAngle += rotationDelta;
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// qCDebug(lcExample) << "pinchTriggered(): rotate by" <<
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// rotationDelta << "->" << rotationAngle;
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}
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if (changeFlags & QPinchGesture::ScaleFactorChanged) {
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if (startScale != startScale) {startScale = s.getScale();}
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s.setScale(startScale * g->totalScaleFactor());
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}
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if (g->state() == Qt::GestureFinished) {
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startScale = NAN;
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}
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if (s.getScale() > 1000) {s.setScale(1000);}
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if (s.getScale() < 5) {s.setScale(5);}
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return true;
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}
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};
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#endif // TOOLMAPZOOM_H
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