Added track scale info

gpxsee.pro

@@ -28,7 +28,9 @@ HEADERS += src/config.h \
     src/map.h \
     src/maplist.h \
     src/downloader.h \
-    src/units.h
+    src/units.h \
+    src/scaleitem.h \
+    src/nicenum.h
 SOURCES += src/main.cpp \
     src/gui.cpp \
     src/gpx.cpp \
@@ -49,7 +51,9 @@ SOURCES += src/main.cpp \
     src/filebrowser.cpp \
     src/map.cpp \
     src/maplist.cpp \
-    src/downloader.cpp
+    src/downloader.cpp \
+    src/scaleitem.cpp \
+    src/nicenum.cpp
 RESOURCES += gpxsee.qrc
 TRANSLATIONS = lang/gpxsee_cs.ts
 macx:ICON = icons/gpxsee.icns

src/axisitem.cpp

@@ -1,6 +1,7 @@
 #include <cmath>
 #include <QPainter>
 #include "config.h"
+#include "nicenum.h"
 #include "axisitem.h"
 
 
@@ -15,38 +16,6 @@ struct Label {
 	double d;
 };
 
-static double niceNum(double x, int round)
-{
-	int expv;
-	double f;
-	double nf;
-
-	expv = floor(log10(x));
-	f = x / pow(10.0, expv);
-
-	if (round) {
-		if (f < 1.5)
-			nf = 1.0;
-		else if (f < 3.0)
-			nf = 2.0;
-		else if (f < 7.0)
-			nf = 5.0;
-		else
-			nf = 10.0;
-	} else {
-		if (f <= 1.0)
-			nf = 1.;
-		else if (f <= 2.0)
-			nf = 2.0;
-		else if (f <= 5.0)
-			nf = 5.0;
-		else
-			nf = 10.0;
-	}
-
-	return nf * pow(10.0, expv);
-}
-
 static struct Label label(double min, double max, int ticks)
 {
 	double range;
@@ -123,7 +92,6 @@ void AxisItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
 	QFont font;
 	font.setPixelSize(FONT_SIZE);
 	font.setFamily(FONT_FAMILY);
-	painter->setFont(font);
 	QFontMetrics fm(font);
 	QRect ts, ls;
 	struct Label l;
@@ -131,6 +99,8 @@ void AxisItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
 	qreal val;
 
 
+	painter->setFont(font);
+
 	ls = fm.tightBoundingRect(_label);
 
 	if (_type == X) {

src/gui.cpp

@@ -670,6 +670,7 @@ void GUI::updateNavigationActions()
 
 void GUI::setMetricUnits()
 {
+	_track->setUnits(Metric);
 	_elevationGraph->setUnits(Metric);
 	_speedGraph->setUnits(Metric);
 	updateStatusBarInfo();
@@ -677,6 +678,7 @@ void GUI::setMetricUnits()
 
 void GUI::setImperialUnits()
 {
+	_track->setUnits(Imperial);
 	_elevationGraph->setUnits(Imperial);
 	_speedGraph->setUnits(Imperial);
 	updateStatusBarInfo();

src/ll.cpp

@@ -68,3 +68,9 @@ int scale2zoom(qreal scale)
 		return ZOOM_MAX;
 	return zoom;
 }
+
+qreal zoom2resolution(int zoom, qreal y)
+{
+	return (WGS84_RADIUS * 2 * M_PI / 256 * cos(2 * atan(exp(deg2rad(y)))
+	  - M_PI/2)) / pow(2.0, zoom);
+}

src/ll.h

@@ -12,5 +12,6 @@ qreal llDistance(const QPointF &p1, const QPointF &p2);
 QPoint mercator2tile(const QPointF &m, int zoom);
 QPointF tile2mercator(const QPoint &tile, int zoom);
 int scale2zoom(qreal scale);
+qreal zoom2resolution(int zoom, qreal y);
 
 #endif // LL_H

src/nicenum.cpp

@@ -0,0 +1,34 @@
+#include <cmath>
+#include "nicenum.h"
+
+double niceNum(double x, int round)
+{
+	int expv;
+	double f;
+	double nf;
+
+	expv = floor(log10(x));
+	f = x / pow(10.0, expv);
+
+	if (round) {
+		if (f < 1.5)
+			nf = 1.0;
+		else if (f < 3.0)
+			nf = 2.0;
+		else if (f < 7.0)
+			nf = 5.0;
+		else
+			nf = 10.0;
+	} else {
+		if (f <= 1.0)
+			nf = 1.0;
+		else if (f <= 2.0)
+			nf = 2.0;
+		else if (f <= 5.0)
+			nf = 5.0;
+		else
+			nf = 10.0;
+	}
+
+	return nf * pow(10.0, expv);
+}

src/nicenum.h

@@ -0,0 +1,6 @@
+#ifndef NICENUM_H
+#define NICENUM_H
+
+double niceNum(double x, int round);
+
+#endif // NICENUM_H

src/scaleitem.cpp

@@ -0,0 +1,123 @@
+#include <QPainter>
+#include "config.h"
+#include "ll.h"
+#include "nicenum.h"
+#include "scaleitem.h"
+
+
+#define SCALE_WIDTH  132
+#define SCALE_HEIGHT 5
+#define SEGMENTS 3
+
+#define PADDING 4
+
+
+ScaleItem::ScaleItem(QGraphicsItem *parent) : QGraphicsItem(parent)
+{
+	_units = Metric;
+}
+
+QRectF ScaleItem::boundingRect() const
+{
+	QFont font;
+	font.setPixelSize(FONT_SIZE);
+	font.setFamily(FONT_FAMILY);
+	QFontMetrics fm(font);
+	QRect ss, es, us;
+
+	ss = fm.tightBoundingRect(QString::number(0));
+	es = fm.tightBoundingRect(QString::number(_length * SEGMENTS));
+	us = fm.tightBoundingRect(units());
+
+	return QRectF(-ss.width()/2, -(PADDING + ss.height() + fm.descent()),
+	  _width * SEGMENTS + ss.width()/2 + qMax(us.width() + PADDING, es.width()/2),
+	  SCALE_HEIGHT + PADDING + ss.height() + 2*fm.descent());
+}
+
+void ScaleItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
+  QWidget *widget)
+{
+	Q_UNUSED(option);
+	Q_UNUSED(widget);
+	QFont font;
+	font.setPixelSize(FONT_SIZE);
+	font.setFamily(FONT_FAMILY);
+	QFontMetrics fm(font);
+
+
+	painter->setFont(font);
+
+	for (int i = 0; i <= SEGMENTS; i++) {
+		QString label = QString::number(_length * i);
+		QRect br = fm.tightBoundingRect(label);
+		painter->drawText(_width * i - br.width()/2, -PADDING, label);
+	}
+	painter->drawText(_width * SEGMENTS + PADDING, SCALE_HEIGHT + fm.descent(),
+	  units());
+
+	painter->drawRect(QRectF(0, 0, SEGMENTS * _width, SCALE_HEIGHT));
+	for (int i = 0; i < SEGMENTS; i += 2)
+		painter->fillRect(QRectF(i * _width, 0, _width, SCALE_HEIGHT),
+		  Qt::black);
+
+/*
+	painter->setPen(Qt::red);
+	painter->drawRect(boundingRect());
+*/
+}
+
+QString ScaleItem::units() const
+{
+	if (_units == Imperial)
+		return _scale ? QObject::tr("mi") : QObject::tr("ft");
+	else
+		return _scale ? QObject::tr("km") : QObject::tr("m");
+}
+
+void ScaleItem::computeScale()
+{
+	qreal res = zoom2resolution(_zoom, _lat);
+
+	if (_units == Imperial) {
+		_length = niceNum((res * M2FT * SCALE_WIDTH) / SEGMENTS, 1);
+		if (_length >= MIINFT) {
+			_length = niceNum((res * M2FT * FT2MI * SCALE_WIDTH) / SEGMENTS, 1);
+			_width = (_length / (res * M2FT * FT2MI));
+			_scale = true;
+		} else {
+			_width = (_length / (res * M2FT));
+			_scale = false;
+		}
+	} else {
+		_length = niceNum((res * SCALE_WIDTH) / SEGMENTS, 1);
+		if (_length >= KMINM) {
+			_length *= M2KM;
+			_width = (_length / (res * M2KM));
+			_scale = true;
+		} else {
+			_width = (_length / res);
+			_scale = false;
+		}
+	}
+}
+
+void ScaleItem::setLatitude(qreal lat)
+{
+	_lat = lat;
+	computeScale();
+	prepareGeometryChange();
+}
+
+void ScaleItem::setZoom(int z)
+{
+	_zoom = z;
+	computeScale();
+	prepareGeometryChange();
+}
+
+void ScaleItem::setUnits(enum Units units)
+{
+	_units = units;
+	computeScale();
+	prepareGeometryChange();
+}

src/scaleitem.h

@@ -0,0 +1,32 @@
+#ifndef SCALEITEM_H
+#define SCALEITEM_H
+
+#include <QGraphicsItem>
+#include "units.h"
+
+class ScaleItem : public QGraphicsItem
+{
+public:
+	ScaleItem(QGraphicsItem *parent = 0);
+
+	QRectF boundingRect() const;
+	void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
+	  QWidget *widget);
+
+	void setLatitude(qreal lat);
+	void setZoom(int z);
+	void setUnits(enum Units units);
+
+private:
+	void computeScale();
+	QString units() const;
+
+	int _zoom;
+	qreal _lat;
+	qreal _width;
+	qreal _length;
+	Units _units;
+	bool _scale;
+};
+
+#endif // SCALEITEM_H

src/track.cpp

@@ -5,9 +5,12 @@
 #include <QWheelEvent>
 #include "poiitem.h"
 #include "markeritem.h"
+#include "scaleitem.h"
 #include "ll.h"
 #include "track.h"
 
+#include <QDebug>
+
 
 #define MARGIN 10.0
 #define TRACK_WIDTH 3
@@ -22,6 +25,9 @@ Track::Track(QWidget *parent)
 	setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 	setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 
+	_mapScale = new ScaleItem();
+	_mapScale->setZValue(2.0);
+
 	_zoom = -1;
 	_scale = 1.0;
 	_map = 0;
@@ -79,6 +85,12 @@ void Track::loadGPX(const GPX &gpx)
 	QRectF ba = br.adjusted(-TILE_SIZE, -TILE_SIZE, TILE_SIZE, TILE_SIZE);
 	_scene->setSceneRect(ba);
 	centerOn(ba.center());
+
+	if (_mapScale->scene() != _scene)
+		_scene->addItem(_mapScale);
+
+	_mapScale->setLatitude(track.at(track.size() / 2).y());
+	_mapScale->setZoom(_zoom);
 }
 
 QRectF Track::trackBoundingRect() const
@@ -198,6 +210,11 @@ void Track::setMap(Map *map)
 	resetCachedContent();
 }
 
+void Track::setUnits(enum Units units)
+{
+	_mapScale->setUnits(units);
+}
+
 void Track::redraw()
 {
 	resetCachedContent();
@@ -225,6 +242,8 @@ void Track::wheelEvent(QWheelEvent *event)
 	else
 		centerOn(pos * scale/_scale);
 
+	_mapScale->setZoom(_zoom);
+
 	resetCachedContent();
 }
 
@@ -245,6 +264,8 @@ void Track::setTrackLineWidth(qreal width)
 
 void Track::plot(QPainter *painter, const QRectF &target)
 {
+	_scene->removeItem(_mapScale);
+
 	QRectF orig = _scene->itemsBoundingRect();
 	QRectF adj;
 	qreal ratio, diff;
@@ -264,6 +285,8 @@ void Track::plot(QPainter *painter, const QRectF &target)
 	_scene->render(painter, target, adj, Qt::KeepAspectRatioByExpanding);
 	setTrackLineWidth(TRACK_WIDTH * _scale);
 	showMarkers(true);
+
+	_scene->addItem(_mapScale);
 }
 
 enum QPrinter::Orientation Track::orientation() const
@@ -286,6 +309,9 @@ void Track::clearPOI()
 
 void Track::clear()
 {
+	if (_mapScale->scene() == _scene)
+		_scene->removeItem(_mapScale);
+
 	_pois.clear();
 	_tracks.clear();
 	_trackPaths.clear();
@@ -362,3 +388,11 @@ void Track::resizeEvent(QResizeEvent *e)
 	centerOn(br.center());
 	resetCachedContent();
 }
+
+void Track::paintEvent(QPaintEvent *e)
+{
+	QPointF scenePos = mapToScene(rect().bottomLeft() + QPoint(10, -15));
+	_mapScale->setPos(scenePos);
+
+	QGraphicsView::paintEvent(e);
+}

src/track.h

@@ -9,11 +9,13 @@
 #include "poi.h"
 #include "gpx.h"
 #include "map.h"
+#include "units.h"
 #include "colorshop.h"
 
 
 class POIItem;
 class MarkerItem;
+class ScaleItem;
 
 class Track : public QGraphicsView
 {
@@ -30,6 +32,7 @@ public:
 	void clear();
 
 	void setMap(Map *map);
+	void setUnits(enum Units units);
 
 	void plot(QPainter *painter, const QRectF &target);
 	enum QPrinter::Orientation orientation() const;
@@ -52,6 +55,7 @@ private:
 	void wheelEvent(QWheelEvent *event);
 	void drawBackground(QPainter *painter, const QRectF &rect);
 	void resizeEvent(QResizeEvent *e);
+	void paintEvent(QPaintEvent *e);
 
 	QGraphicsScene *_scene;
 	QList<QVector<QPointF> > _tracks;
@@ -59,6 +63,7 @@ private:
 	QList<MarkerItem*> _markers;
 	QHash<Entry, POIItem*> _pois;
 	Map *_map;
+	ScaleItem *_mapScale;
 
 	ColorShop _colorShop;
 	qreal _maxLen;

src/units.h

@@ -11,5 +11,9 @@ enum Units {
 #define M2FT    3.280839900000  // m -> ft
 #define MS2KMH  3.600000000000  // m/s -> km/h
 #define MS2MIH  2.236936290000  // m/s -> mi/h
+#define FT2MI   0.000189393939  // ft -> mi
+
+#define MIINFT  5280 // 1 mi in ft
+#define KMINM   1000 // 1 km in m
 
 #endif // UNITS_H