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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/style/style_ray.h"
#include "third_party/blink/renderer/core/style/basic_shapes.h"
#include "third_party/blink/renderer/platform/geometry/path.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/geometry/size_f.h"
namespace blink {
StyleRay::StyleRay(float angle,
RaySize size,
bool contain,
const BasicShapeCenterCoordinate& center_x,
const BasicShapeCenterCoordinate& center_y,
bool has_explicit_center)
: angle_(angle),
size_(size),
contain_(contain),
center_x_(center_x),
center_y_(center_y),
has_explicit_center_(has_explicit_center) {}
bool StyleRay::IsEqualAssumingSameType(const BasicShape& o) const {
const StyleRay& other = To<StyleRay>(o);
return angle_ == other.angle_ && size_ == other.size_ &&
contain_ == other.contain_ && center_x_ == other.center_x_ &&
center_y_ == other.center_y_ &&
has_explicit_center_ == other.has_explicit_center_;
}
Path StyleRay::GetPath(const gfx::RectF&, float, float) const {
// ComputedStyle::ApplyMotionPathTransform cannot call GetPath
// for rays as they may have infinite length.
NOTREACHED();
}
namespace {
float CalculatePerpendicularDistanceToReferenceBoxSide(
const gfx::PointF& point,
const gfx::SizeF& reference_box_size,
float (*comp)(std::initializer_list<float>)) {
return comp(
{std::abs(point.x()), std::abs(point.x() - reference_box_size.width()),
std::abs(point.y()), std::abs(point.y() - reference_box_size.height())});
}
float CalculateDistance(const gfx::PointF& a, const gfx::PointF& b) {
return (a - b).Length();
}
float CalculateDistanceToReferenceBoxCorner(
const gfx::PointF& point,
const gfx::SizeF& box_size,
float (*comp)(std::initializer_list<float>)) {
return comp({CalculateDistance(point, {0, 0}),
CalculateDistance(point, {box_size.width(), 0}),
CalculateDistance(point, {box_size.width(), box_size.height()}),
CalculateDistance(point, {0, box_size.height()})});
}
float CalculateDistanceToReferenceBoxSide(
const gfx::PointF& point,
const float angle,
const gfx::SizeF& reference_box_size) {
if (!gfx::RectF(reference_box_size).InclusiveContains(point)) {
return 0;
}
const float theta = Deg2rad(angle);
float cos_t = std::cos(theta);
float sin_t = std::sin(theta);
// We are looking for % point, let's swap signs and lines
// so that we end up in situation like this:
// (0, 0) #--------------%--# (box.width, 0)
// | | / |
// | v / |
// | | / |
// | |t/ |
// | |/ |
// (point) *---h----* (box.width, point.y)
// | | |
// | | |
// (0, box.height)#-----------------# (box.width, box.height)
// cos_t and sin_t swapped due to the 0 angle is pointing up.
const float vertical =
cos_t >= 0 ? point.y() : reference_box_size.height() - point.y();
const float horizontal =
sin_t >= 0 ? reference_box_size.width() - point.x() : point.x();
cos_t = std::abs(cos_t);
sin_t = std::abs(sin_t);
// Check what side we hit.
if (vertical * sin_t > horizontal * cos_t) {
return horizontal / sin_t;
}
return vertical / cos_t;
}
} // namespace
float StyleRay::CalculateRayPathLength(
const gfx::PointF& starting_point,
const gfx::SizeF& reference_box_size) const {
switch (Size()) {
case StyleRay::RaySize::kClosestSide:
return CalculatePerpendicularDistanceToReferenceBoxSide(
starting_point, reference_box_size, std::min);
case StyleRay::RaySize::kFarthestSide:
return CalculatePerpendicularDistanceToReferenceBoxSide(
starting_point, reference_box_size, std::max);
case StyleRay::RaySize::kClosestCorner:
return CalculateDistanceToReferenceBoxCorner(
starting_point, reference_box_size, std::min);
case StyleRay::RaySize::kFarthestCorner:
return CalculateDistanceToReferenceBoxCorner(
starting_point, reference_box_size, std::max);
case StyleRay::RaySize::kSides:
return CalculateDistanceToReferenceBoxSide(starting_point, Angle(),
reference_box_size);
}
}
PointAndTangent StyleRay::PointAndNormalAtLength(
const gfx::PointF& starting_point,
float length) const {
const float angle = Angle() - 90;
const float rad = Deg2rad(angle);
const float x = starting_point.x() + length * std::cos(rad);
const float y = starting_point.y() + length * std::sin(rad);
return {{x, y}, angle};
}
} // namespace blink
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