35 lines
1.5 KiB
C
35 lines
1.5 KiB
C
#pragma once
|
|
|
|
#include <QPoint>
|
|
#include <QRectF>
|
|
#include <QVector2D>
|
|
|
|
// The coverage rules of a selection box (REQ-UI-MULTI-SELECT, REQ-BLD-DECONSTRUCT-BOX).
|
|
//
|
|
// The box is a rectangle in world coordinates — tiles as the unit, but fractional,
|
|
// because the drag follows the mouse and is not snapped to the tile grid. The two
|
|
// rules below are the whole of what "covered by the box" means; they live here so the
|
|
// building query and the entity queries answer it identically.
|
|
//
|
|
// Both callers pass a normalized rectangle: neither rule normalizes on its own.
|
|
|
|
// Whether the box overlaps the unit square of `tile` — the rule for anything that
|
|
// occupies whole tiles (buildings, construction sites, defence station bodies). The
|
|
// comparisons are inclusive, so a box that only grazes the tile's edge still covers
|
|
// it, and a box with no area covers the tile it lies on.
|
|
inline bool boxCoversTile(const QRectF& worldBox, QPoint tile)
|
|
{
|
|
return worldBox.left() <= static_cast<qreal>(tile.x()) + 1.0
|
|
&& worldBox.right() >= static_cast<qreal>(tile.x())
|
|
&& worldBox.top() <= static_cast<qreal>(tile.y()) + 1.0
|
|
&& worldBox.bottom() >= static_cast<qreal>(tile.y());
|
|
}
|
|
|
|
// Whether the box contains `worldPos` — the rule for anything that has a position
|
|
// rather than a footprint (ships, debris). Their centre is what the box must enclose,
|
|
// so that what the rectangle visibly holds is what the drag selects.
|
|
inline bool boxCoversPoint(const QRectF& worldBox, QVector2D worldPos)
|
|
{
|
|
return worldBox.contains(QPointF(worldPos.x(), worldPos.y()));
|
|
}
|