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- redid clipinsidebox* functions.

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* Completely rewritten to be less obtuse.
* Consolidated the two variants.
* Renamed to be clearer about what they do.
This commit is contained in:
Christoph Oelckers 2022-08-17 23:24:44 +02:00
parent b9d0c9d6ba
commit 3a9f9988f4
8 changed files with 67 additions and 121 deletions
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42
source/core/gamefuncs.cpp
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@ -393,6 +393,48 @@ void GetFlatSpritePosition(const tspritetype* spr, const DVector2& pos, DVector2
TGetFlatSpritePosition(spr, pos, out, outz, tspriteGetSlope(spr), render);
}
//==========================================================================
//
// checks if the given point is sufficiently close to the given line segment.
//
//==========================================================================
EClose IsCloseToLine(const DVector2& point, const DVector2& start, const DVector2& end, double maxdist)
{
auto const v1 = start - point;
auto const v2 = end - point;
// trivially outside the box.
if (
((v1.X < -maxdist) && (v2.X < -maxdist)) || // fully to the left
((v1.Y < -maxdist) && (v2.Y < -maxdist)) || // fully below
((v1.X >= maxdist) && (v2.X >= maxdist)) || // fully to the right
((v1.Y >= maxdist) && (v2.Y >= maxdist))) // fully above
return EClose::Outside;
auto waldelta = end - start;
if (waldelta.X * v1.Y <= waldelta.Y * v1.X)
{
// is it in front?
waldelta.X *= waldelta.X > 0 ? v1.Y + maxdist : v1.Y - maxdist;
waldelta.Y *= waldelta.Y > 0 ? v1.X - maxdist : v1.X + maxdist;
return waldelta.X > waldelta.Y ? EClose::InFront : EClose::Outside;
}
else
{
// or behind?
waldelta.X *= waldelta.X > 0 ? v1.Y - maxdist : v1.Y + maxdist;
waldelta.Y *= waldelta.Y > 0 ? v1.X + maxdist : v1.X - maxdist;
return (waldelta.X <= waldelta.Y) ? EClose::Behind : EClose::Outside;
}
}
EClose IsCloseToWall(const DVector2& point, walltype* wal, double maxdist)
{
return IsCloseToLine(point, wal->pos, wal->point2Wall()->pos, maxdist);
}
//==========================================================================
//
// Check if some walls are set to use rotated textures.