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LibWeb: Implement missing CanvasPath::lineTo() steps

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This commit is contained in:
MacDue
2024-03-20 21:21:47 +00:00
committed by Andreas Kling
parent 6128a28f17
commit d951ee399f
2 changed files with 21 additions and 1 deletions
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20
Userland/Libraries/LibWeb/HTML/Canvas/CanvasPath.cpp
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@@ -17,6 +17,12 @@ Gfx::AffineTransform CanvasPath::active_transform() const
return {};
}
void CanvasPath::ensure_subpath(float x, float y)
{
if (m_path.is_empty())
m_path.move_to(active_transform().map(Gfx::FloatPoint { x, y }));
}
void CanvasPath::close_path()
{
m_path.close();
@@ -33,9 +39,21 @@ void CanvasPath::move_to(float x, float y)
m_path.move_to(active_transform().map(Gfx::FloatPoint { x, y }));
}
// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-lineto
void CanvasPath::line_to(float x, float y)
{
m_path.line_to(active_transform().map(Gfx::FloatPoint { x, y }));
// 1. If either of the arguments are infinite or NaN, then return.
if (!isfinite(x) || !isfinite(y))
return;
if (m_path.is_empty()) {
// 2. If the object's path has no subpaths, then ensure there is a subpath for (x, y).
ensure_subpath(x, y);
} else {
// 3. Otherwise, connect the last point in the subpath to the given point (x, y) using a straight line,
// and then add the given point (x, y) to the subpath.
m_path.line_to(active_transform().map(Gfx::FloatPoint { x, y }));
}
}
void CanvasPath::quadratic_curve_to(float cx, float cy, float x, float y)