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LibWeb: Add spec comments to canvas context2d rect

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Bastiaan van der Plaat 2023-10-04 15:26:27 +02:00 • committed by Andreas Kling
parent 573a2619a5
commit 9997d8f178
3 changed files with 17 additions and 8 deletions
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21
Userland/Libraries/LibWeb/HTML/Canvas/CanvasPath.cpp
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@ -192,16 +192,25 @@ WebIDL::ExceptionOr<void> CanvasPath::arc_to(double x1, double y1, double x2, do
return {};
}
void CanvasPath::rect(float x, float y, float width, float height)
// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-rect
void CanvasPath::rect(double x, double y, double w, double h)
{
// 1. If any of the arguments are infinite or NaN, then return.
if (!isfinite(x) || !isfinite(y) || !isfinite(w) || !isfinite(h))
return;
// 2. Create a new subpath containing just the four points (x, y), (x+w, y), (x+w, y+h), (x, y+h), in that order, with those four points connected by straight lines.
auto transform = active_transform();
m_path.move_to(transform.map(Gfx::FloatPoint { x, y }));
if (width == 0 || height == 0)
return;
m_path.line_to(transform.map(Gfx::FloatPoint { x + width, y }));
m_path.line_to(transform.map(Gfx::FloatPoint { x + width, y + height }));
m_path.line_to(transform.map(Gfx::FloatPoint { x, y + height }));
m_path.line_to(transform.map(Gfx::FloatPoint { x + w, y }));
m_path.line_to(transform.map(Gfx::FloatPoint { x + w, y + h }));
m_path.line_to(transform.map(Gfx::FloatPoint { x, y + h }));
// 3. Mark the subpath as closed.
m_path.close();
// 4. Create a new subpath with the point (x, y) as the only point in the subpath.
m_path.move_to(transform.map(Gfx::FloatPoint { x, y }));
}
}