donner::PathBuilder Class Reference

Mutable builder for constructing immutable Path objects. More...

#include "donner/base/Path.h"

Public Member Functions
Path	build ()
	Build the immutable Path. The builder is reset after this call.
Path construction
PathBuilder &	moveTo (const Vector2d &point)
	Start a new subpath at point.
PathBuilder &	lineTo (const Vector2d &point)
	Line from the current point to point.
PathBuilder &	quadTo (const Vector2d &control, const Vector2d &end)
	Quadratic Bézier from the current point through control to end.
PathBuilder &	curveTo (const Vector2d &c1, const Vector2d &c2, const Vector2d &end)
	Cubic Bézier from the current point through c1, c2 to end.
PathBuilder &	arcTo (const Vector2d &radius, double rotationRadians, bool largeArc, bool sweep, const Vector2d &end)
	Elliptical arc from the current point to end.
PathBuilder &	closePath ()
	Close the current subpath with a straight line back to the last moveTo point.
Shape helpers
PathBuilder &	addRect (const Box2d &rect)
	Add an axis-aligned rectangle.
PathBuilder &	addRoundedRect (const Box2d &rect, double rx, double ry)
	Add a rounded rectangle with corner radii rx and ry.
PathBuilder &	addEllipse (const Box2d &bounds)
	Add an ellipse inscribed in bounds.
PathBuilder &	addCircle (const Vector2d &center, double radius)
	Add a circle with center center and radius radius.
PathBuilder &	addPath (const Path &path)
	Append all commands from path.
State
Vector2d	currentPoint () const
	Returns the current point (end point of the last command), or (0,0) if empty.
bool	empty () const
	Returns true if no commands have been added.

Detailed Description

Mutable builder for constructing immutable Path objects.

Usage:

Path path = PathBuilder()
    .moveTo({0, 0})
    .lineTo({100, 0})
    .quadTo({100, 100}, {0, 100})
    .closePath()
    .build();

Member Function Documentation

arcTo()

PathBuilder & donner::PathBuilder::arcTo	(	const Vector2d &	radius,
		double	rotationRadians,
		bool	largeArc,
		bool	sweep,
		const Vector2d &	end )

Elliptical arc from the current point to end.

The arc is decomposed into cubic Bézier curves internally.

Parameters

radius	Ellipse radius (before rotation).
rotationRadians	X-axis rotation of the ellipse in radians.
largeArc	True for arc length >= 180 degrees.
sweep	True for positive-angle arc direction.
end	End point of the arc.

---

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

• donner/base/Path.h
• donner/base/Path.cc