A geometry class specialized for Canvas::DrawPoints. More...

#include <point_field_geometry.h>

Inheritance diagram for impeller::PointFieldGeometry:

Public Member Functions
	PointFieldGeometry (const Point *points, size_t point_count, Scalar radius, bool round)

	~PointFieldGeometry () override

std::optional< Rect >	GetCoverage (const Matrix &transform) const override

Public Member Functions inherited from impeller::Geometry
virtual	~Geometry ()

virtual GeometryResult::Mode	GetResultMode () const

virtual bool	CoversArea (const Matrix &transform, const Rect &rect) const
	Determines if this geometry, transformed by the given `transform`, will completely cover all surface area of the given `rect`.

virtual bool	IsAxisAlignedRect () const

virtual bool	CanApplyMaskFilter () const

virtual Scalar	ComputeAlphaCoverage (const Matrix &transform) const

Additional Inherited Members
Static Public Member Functions inherited from impeller::Geometry
static std::unique_ptr< Geometry >	MakeFillPath (const flutter::DlPath &path, std::optional< Rect > inner_rect=std::nullopt)

static std::unique_ptr< Geometry >	MakeStrokePath (const flutter::DlPath &path, const StrokeParameters &stroke={})

static std::unique_ptr< Geometry >	MakeCover ()

static std::unique_ptr< Geometry >	MakeRect (const Rect &rect)

static std::unique_ptr< Geometry >	MakeOval (const Rect &rect)

static std::unique_ptr< Geometry >	MakeLine (const Point &p0, const Point &p1, const StrokeParameters &stroke)

static std::unique_ptr< Geometry >	MakeCircle (const Point &center, Scalar radius)

static std::unique_ptr< Geometry >	MakeStrokedCircle (const Point &center, Scalar radius, Scalar stroke_width)

static std::unique_ptr< Geometry >	MakeFilledArc (const Rect &oval_bounds, Degrees start, Degrees sweep, bool include_center)

static std::unique_ptr< Geometry >	MakeStrokedArc (const Rect &oval_bounds, Degrees start, Degrees sweep, const StrokeParameters &stroke)

static std::unique_ptr< Geometry >	MakeRoundRect (const Rect &rect, const Size &radii)

static std::unique_ptr< Geometry >	MakeRoundSuperellipse (const Rect &rect, Scalar corner_radius)

static Scalar	ComputeStrokeAlphaCoverage (const Matrix &entity, Scalar stroke_width)
	Compute an alpha value to simulate lower coverage of fractional pixel strokes.

static GeometryResult	ComputePositionGeometry (const ContentContext &renderer, const Tessellator::VertexGenerator &generator, const Entity &entity, RenderPass &pass)

Detailed Description

A geometry class specialized for Canvas::DrawPoints.

Does not hold ownership of the allocated point data, which is expected to be maintained via the display list structure.

Definition at line 16 of file point_field_geometry.h.

Constructor & Destructor Documentation

◆ PointFieldGeometry()

impeller::PointFieldGeometry::PointFieldGeometry	(	const Point *	points,
		size_t	point_count,
		Scalar	radius,
		bool	round
	)

Definition at line 15 of file point_field_geometry.cc.

    : point_count_(point_count),
      radius_(radius),
      round_(round),
      points_(points) {}

◆ ~PointFieldGeometry()

impeller::PointFieldGeometry::~PointFieldGeometry ( )

overridedefault

Member Function Documentation

◆ GetCoverage()

std::optional< Rect > impeller::PointFieldGeometry::GetCoverage ( const Matrix & transform ) const

overridevirtual

Implements impeller::Geometry.

Definition at line 134 of file point_field_geometry.cc.

                                   {
  if (point_count_ > 0) {
    // Doesn't use MakePointBounds as this isn't resilient to points that
    // all lie along the same axis.
    Scalar left = points_[0].x;
    Scalar top = points_[0].y;
    Scalar right = points_[0].x;
    Scalar bottom = points_[0].y;
    for (auto i = 1u; i < point_count_; i++) {
      const Point point = points_[i];
      left = std::min(left, point.x);
      top = std::min(top, point.y);
      right = std::max(right, point.x);
      bottom = std::max(bottom, point.y);
    }
    Rect coverage = Rect::MakeLTRB(left - radius_, top - radius_,
                                   right + radius_, bottom + radius_);
    return coverage.TransformBounds(transform);
  }
  return std::nullopt;
}

References i, impeller::TRect< Scalar >::MakeLTRB(), transform, impeller::TRect< T >::TransformBounds(), impeller::TPoint< T >::x, and impeller::TPoint< T >::y.

Referenced by impeller::testing::TEST_P().

The documentation for this class was generated from the following files:

impeller/entity/geometry/point_field_geometry.h
impeller/entity/geometry/point_field_geometry.cc