path_source.cc

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#include "flutter/impeller/geometry/path_source.h"
 
namespace impeller {
 
RectPathSource::~RectPathSource() = default;
 
bool RectPathSource::IsConvex() const {
  return true;
}
 
FillType RectPathSource::GetFillType() const {
  return FillType::kNonZero;
}
 
Rect RectPathSource::GetBounds() const {
  return rect_;
}
 
void RectPathSource::Dispatch(PathReceiver& receiver) const {
  receiver.MoveTo(rect_.GetLeftTop(), true);
  receiver.LineTo(rect_.GetRightTop());
  receiver.LineTo(rect_.GetRightBottom());
  receiver.LineTo(rect_.GetLeftBottom());
  receiver.LineTo(rect_.GetLeftTop());
  receiver.Close();
}
 
EllipsePathSource::EllipsePathSource(const Rect& bounds) : bounds_(bounds) {}
 
EllipsePathSource::~EllipsePathSource() = default;
 
FillType EllipsePathSource::GetFillType() const {
  return FillType::kNonZero;
}
 
Rect EllipsePathSource::GetBounds() const {
  return bounds_;
}
 
bool EllipsePathSource::IsConvex() const {
  return true;
}
 
void EllipsePathSource::Dispatch(PathReceiver& receiver) const {
  Scalar left = bounds_.GetLeft();
  Scalar right = bounds_.GetRight();
  Scalar top = bounds_.GetTop();
  Scalar bottom = bounds_.GetBottom();
  Point center = bounds_.GetCenter();
 
  receiver.MoveTo(Point(left, center.y), true);
  receiver.ConicTo(Point(left, top), Point(center.x, top), kSqrt2Over2);
  receiver.ConicTo(Point(right, top), Point(right, center.y), kSqrt2Over2);
  receiver.ConicTo(Point(right, bottom), Point(center.x, bottom), kSqrt2Over2);
  receiver.ConicTo(Point(left, bottom), Point(left, center.y), kSqrt2Over2);
 
  receiver.Close();
}
 
}  // namespace impeller