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#include "cru/platform/graphics/cairo/CairoGeometry.h"
#include "cru/base/log/Logger.h"
#include "cru/platform/graphics/Geometry.h"
#include "cru/platform/graphics/cairo/CairoGraphicsFactory.h"
#include <cairo/cairo.h>
#include <numbers>
namespace cru::platform::graphics::cairo {
CairoGeometry::CairoGeometry(CairoGraphicsFactory* factory,
cairo_path_t* cairo_path, const Matrix& transform,
bool auto_destroy)
: CairoResource(factory),
cairo_path_(cairo_path),
transform_(transform),
auto_destroy_(auto_destroy) {
Expects(cairo_path);
}
CairoGeometry::~CairoGeometry() {
if (auto_destroy_) {
cairo_path_destroy(cairo_path_);
cairo_path_ = nullptr;
}
}
bool CairoGeometry::StrokeContains(float width, const Point& point) {
auto cairo = GetCairoGraphicsFactory()->GetDefaultCairo();
cairo_save(cairo);
auto matrix = Convert(transform_);
cairo_transform(cairo, &matrix);
cairo_new_path(cairo);
cairo_append_path(cairo, cairo_path_);
cairo_set_line_width(cairo, width);
auto result = cairo_in_stroke(cairo, point.x, point.y);
cairo_restore(cairo);
return result;
}
bool CairoGeometry::FillContains(const Point& point) {
auto cairo = GetCairoGraphicsFactory()->GetDefaultCairo();
cairo_save(cairo);
auto matrix = Convert(transform_);
cairo_transform(cairo, &matrix);
cairo_new_path(cairo);
cairo_append_path(cairo, cairo_path_);
auto result = cairo_in_fill(cairo, point.x, point.y);
cairo_restore(cairo);
return result;
}
Rect CairoGeometry::GetBounds() {
auto cairo = GetCairoGraphicsFactory()->GetDefaultCairo();
cairo_save(cairo);
auto matrix = Convert(transform_);
cairo_transform(cairo, &matrix);
cairo_new_path(cairo);
cairo_append_path(cairo, cairo_path_);
double l, t, r, b;
cairo_path_extents(cairo, &l, &t, &r, &b);
cairo_restore(cairo);
return Rect::FromVertices(l, t, r, b);
}
std::unique_ptr<IGeometry> CairoGeometry::Transform(const Matrix& matrix) {
auto cairo = GetCairoGraphicsFactory()->GetDefaultCairo();
cairo_save(cairo);
cairo_new_path(cairo);
cairo_append_path(cairo, cairo_path_);
auto path = cairo_copy_path(cairo);
cairo_restore(cairo);
return std::unique_ptr<IGeometry>(new CairoGeometry(
GetCairoGraphicsFactory(), path, transform_ * matrix, true));
}
std::unique_ptr<IGeometry> CairoGeometry::CreateStrokeGeometry(float width) {
throw Exception("Not implemented");
}
CairoGeometryBuilder::CairoGeometryBuilder(CairoGraphicsFactory* factory)
: CairoResource(factory) {
surface_ = cairo_recording_surface_create(CAIRO_CONTENT_COLOR_ALPHA, nullptr);
cairo_ = cairo_create(surface_);
cairo_new_path(cairo_);
cairo_move_to(cairo_, 0.0, 0.0);
}
CairoGeometryBuilder::~CairoGeometryBuilder() {
cairo_destroy(cairo_);
cairo_surface_destroy(surface_);
}
Point CairoGeometryBuilder::GetCurrentPosition() {
double x, y;
cairo_get_current_point(cairo_, &x, &y);
return Point(x, y);
}
void CairoGeometryBuilder::MoveTo(const Point& point) {
cairo_move_to(cairo_, point.x, point.y);
}
void CairoGeometryBuilder::LineTo(const Point& point) {
cairo_line_to(cairo_, point.x, point.y);
}
void CairoGeometryBuilder::CubicBezierTo(const Point& start_control_point,
const Point& end_control_point,
const Point& end_point) {
cairo_curve_to(cairo_, start_control_point.x, start_control_point.y,
end_control_point.x, end_control_point.y, end_point.x,
end_point.y);
}
void CairoGeometryBuilder::QuadraticBezierTo(const Point& control_point,
const Point& end_point) {
CubicBezierTo(control_point, control_point, end_point);
}
namespace {
bool Near(const Point& p1, const Point& p2) {
return std::abs(p1.x - p2.x) < 0.0001 && std::abs(p1.y - p2.y) < 0.0001;
}
} // namespace
void CairoGeometryBuilder::ArcTo(const Point& radius, float angle,
bool is_large_arc, bool is_clockwise,
const Point& end_point) {
auto pos = GetCurrentPosition();
auto info = CalculateArcInfo(pos, radius, angle, is_large_arc, is_clockwise,
end_point);
CruLogDebug(
kLogTag,
"Arc to {}, radius {}, angle {}, is_large_arc {}, is_clockwise {}, "
"end_point {}. Calculated, center {}, start_angle {}, end_angle {}.",
pos, radius, angle, is_large_arc, is_clockwise, end_point, info.center,
info.start_angle, info.end_angle);
cairo_new_sub_path(cairo_);
cairo_save(cairo_);
cairo_translate(cairo_, info.center.x, info.center.y);
cairo_scale(cairo_, radius.x, radius.y);
cairo_rotate(cairo_, angle * std::numbers::pi / 180.0);
cairo_arc(cairo_, 0, 0, 1, info.start_angle, info.end_angle);
cairo_restore(cairo_);
cairo_move_to(cairo_, end_point.x, end_point.y);
}
void CairoGeometryBuilder::CloseFigure(bool close) {
if (close) cairo_close_path(cairo_);
}
std::unique_ptr<IGeometry> CairoGeometryBuilder::Build() {
cairo_path_t* path = cairo_copy_path(cairo_);
return std::unique_ptr<IGeometry>(new CairoGeometry(
GetCairoGraphicsFactory(), path, Matrix::Identity(), true));
}
} // namespace cru::platform::graphics::cairo
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