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Fixed map resolution computation for maps > world/2

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This commit is contained in:
Martin Tůma 2023-09-15 23:28:16 +02:00
parent 1304fd5c3c
commit 2e7f8dc341
1 changed files with 11 additions and 3 deletions
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14
src/map/map.cpp
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@ -62,9 +62,17 @@ RectC Map::llBounds()
qreal Map::resolution(const QRectF &rect)
{
qreal cy = rect.center().y();
QPointF cl(rect.left(), cy);
QPointF cr(rect.right(), cy);
/* The haversine formula used in Coordinates::distanceTo() only gives
"half world" distances and shorter so we have to use only the center
"half rectangle" in case e.g. world map bounds are on the input */
QRectF halfRect(QPointF(rect.left() + (rect.width() / 4.0),
rect.top() + (rect.height() / 4.0)),
QPointF(rect.right() - (rect.width() / 4.0),
rect.bottom() - (rect.height() / 4.0)));
qreal cy = halfRect.center().y();
QPointF cl(halfRect.left(), cy);
QPointF cr(halfRect.right(), cy);
qreal ds = xy2ll(cl).distanceTo(xy2ll(cr));
qreal ps = QLineF(cl, cr).length();