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