version 2.13.0

add Map library (MapView with OSM maps and items) and mapviewer util

libs/map/mapitemellipse.cpp

@@ -0,0 +1,77 @@
+#include "mapitemellipse.h"
+
+#include <math.h>
+
+
+MapItemEllipse::MapItemEllipse(const QRectF & r) {
+	setEllipse(r);
+}
+
+
+MapItemEllipse::MapItemEllipse(const QPointF & p, double rx, double ry) {
+	setEllipse(p, rx, ry);
+}
+
+
+void MapItemEllipse::setStartAngle(double a) {
+	sa = a;
+	rebuild();
+	updateParent();
+}
+
+
+void MapItemEllipse::setEndAngle(double a) {
+	ea = a;
+	rebuild();
+	updateParent();
+}
+
+
+void MapItemEllipse::setEllipse(const QRectF & r) {
+	rct = r;
+	rebuild();
+	updateParent();
+}
+
+
+void MapItemEllipse::setEllipse(const QPointF & p, double rx, double ry) {
+	rct.setWidth(rx * 2.);
+	rct.setHeight(ry * 2.);
+	rct.moveCenter(p);
+	rebuild();
+	updateParent();
+}
+
+
+void MapItemEllipse::draw(QPainter * p) {
+	p->setPen(pen());
+	p->setBrush(brush());
+	QPolygonF dp(pol);
+	double us = unitScale();
+	for (auto & i: dp)
+		i = QPointF(i.x(), -i.y()) / us;
+	p->drawPolygon(dp);
+	setBoundingRect(dp.boundingRect());
+}
+
+
+void MapItemEllipse::rebuild() {
+	pol.clear();
+	QPointF c = rct.center();
+	bool full = sa == ea;
+	if (!full) pol << c;
+	double w = rct.width() / 2., h = rct.height() / 2.;
+	static double deg2rad = M_PI / 180.;
+	if (full) {
+		sa = 0.;
+		ea = 360.;
+	} else {
+		if (ea < sa) qSwap(sa, ea);
+	}
+	for (double a = sa; a <= ea; a += 3.) {
+		if (a > ea) a = ea;
+		QPointF p(sin(a * deg2rad) * w, cos(a * deg2rad) * h);
+		pol << (c + p);
+	}
+	if (!full) pol << c;
+}