RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 05:27:43 +00:00
Code Issues Activity Actions

LibWeb: Apply canvas transform while building paths

Browse source 
The transform can change between path building operations (and before
the path is filled or stroked). This fixes the sun ray backgroun on
the https://www.kevs3d.co.uk/dev/html5logo/ canvas demo.
This commit is contained in:
MacDue 2023-06-17 00:17:22 +01:00 • committed by Andreas Kling
parent 9e57f8d183
commit 4f2770a745
3 changed files with 40 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

37
Userland/Libraries/LibWeb/HTML/Canvas/CanvasPath.cpp
View file

@ -10,6 +10,13 @@
namespace Web::HTML {
Gfx::AffineTransform CanvasPath::active_transform() const
{
if (m_canvas_state.has_value())
return m_canvas_state->drawing_state().transform;
return {};
}
void CanvasPath::close_path()
{
m_path.close();
@ -17,22 +24,25 @@ void CanvasPath::close_path()
void CanvasPath::move_to(float x, float y)
{
m_path.move_to({ x, y });
m_path.move_to(active_transform().map(Gfx::FloatPoint { x, y }));
}
void CanvasPath::line_to(float x, float y)
{
m_path.line_to({ x, y });
m_path.line_to(active_transform().map(Gfx::FloatPoint { x, y }));
}
void CanvasPath::quadratic_curve_to(float cx, float cy, float x, float y)
{
m_path.quadratic_bezier_curve_to({ cx, cy }, { x, y });
auto transform = active_transform();
m_path.quadratic_bezier_curve_to(transform.map(Gfx::FloatPoint { cx, cy }), transform.map(Gfx::FloatPoint { x, y }));
}
void CanvasPath::bezier_curve_to(double cp1x, double cp1y, double cp2x, double cp2y, double x, double y)
{
m_path.cubic_bezier_curve_to(Gfx::FloatPoint(cp1x, cp1y), Gfx::FloatPoint(cp2x, cp2y), Gfx::FloatPoint(x, y));
auto transform = active_transform();
m_path.cubic_bezier_curve_to(
transform.map(Gfx::FloatPoint { cp1x, cp1y }), transform.map(Gfx::FloatPoint { cp2x, cp2y }), transform.map(Gfx::FloatPoint { x, y }));
}
WebIDL::ExceptionOr<void> CanvasPath::arc(float x, float y, float radius, float start_angle, float end_angle, bool counter_clockwise)
@ -97,23 +107,28 @@ WebIDL::ExceptionOr<void> CanvasPath::ellipse(float x, float y, float radius_x,
auto start_point = resolve_point_with_angle(start_angle);
auto end_point = resolve_point_with_angle(end_angle);
m_path.move_to(start_point);
auto delta_theta = end_angle - start_angle;
m_path.elliptical_arc_to(end_point, { radius_x, radius_y }, rotation, delta_theta > AK::Pi<float>, !counter_clockwise);
auto transform = active_transform();
m_path.move_to(transform.map(start_point));
m_path.elliptical_arc_to(
transform.map(Gfx::FloatPoint { end_point }),
transform.map(Gfx::FloatSize { radius_x, radius_y }),
rotation + transform.rotation(),
delta_theta > AK::Pi<float>, !counter_clockwise);
return {};
}
void CanvasPath::rect(float x, float y, float width, float height)
{
m_path.move_to({ x, y });
auto transform = active_transform();
m_path.move_to(transform.map(Gfx::FloatPoint { x, y }));
if (width == 0 || height == 0)
return;
m_path.line_to({ x + width, y });
m_path.line_to({ x + width, y + height });
m_path.line_to({ x, y + height });
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.close();
}