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[rshapes] Update DrawRectangleLinesEx()

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Add support for negative `thick` values. When `thick` is negative, lines are drawn growing outside of the rectangle.
This commit is contained in:
Matthew Roush 2026-07-31 14:11:49 -04:00
commit feaf952d26
1 changed files with 40 additions and 11 deletions
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51
src/rshapes.c
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@ -637,24 +637,53 @@ void DrawRectangleLinesEx(Rectangle rec, float thick, Color color)
else if (rec.width <= rec.height) thick = rec.width/2;
}
// When rec = { x, y, 8.0f, 6.0f } and thick = 2, the following
// four rectangles are drawn ([T]op, [B]ottom, [L]eft, [R]ight):
//
// TTTTTTTT
// TTTTTTTT
// LL RR
// LL RR
// BBBBBBBB
// BBBBBBBB
//
if (thick > 0.0f)
{
// When rec = { x, y, 8.0f, 6.0f } and thick = 2, the following
// four rectangles are drawn ([T]op, [B]ottom, [L]eft, [R]ight):
//
// TTTTTTTT
// TTTTTTTT
// LL RR
// LL RR
// BBBBBBBB
// BBBBBBBB
//
Rectangle top = { rec.x, rec.y, rec.width, thick };
Rectangle bottom = { rec.x, rec.y - thick + rec.height, rec.width, thick };
Rectangle left = { rec.x, rec.y + thick, thick, rec.height - thick*2.0f };
Rectangle right = { rec.x - thick + rec.width, rec.y + thick, thick, rec.height - thick*2.0f };
DrawRectangleRec(top, color);
DrawRectangleRec(bottom, color);
DrawRectangleRec(left, color);
DrawRectangleRec(right, color);
}
else
{
// When rec = { x, y, 8.0f, 6.0f } and thick = -2, the following
// four rectangles are drawn ([T]op, [B]ottom, [L]eft, [R]ight):
//
// TTTTTTTTTTTT
// TTTTTTTTTTTT
// LL RR
// LL RR
// LL RR
// LL RR
// LL RR
// LL RR
// BBBBBBBBBBBB
// BBBBBBBBBBBB
//
thick *= -1.0f;
Rectangle top = { rec.x - thick, rec.y - thick, rec.width + thick*2.0f, thick };
Rectangle bottom = { rec.x - thick, rec.y + rec.height, rec.width + thick*2.0f, thick};
Rectangle left = { rec.x - thick, rec.y, thick, rec.height };
Rectangle right = { rec.x + rec.width, rec.y, thick, rec.height };
DrawRectangleRec(top, color);
DrawRectangleRec(bottom, color);
DrawRectangleRec(left, color);