The d attribute of a "<path>" element defines the shape of the path. It is a sequence of commands, each of which is a single letter followed by a sequence of numbers, such as M 40 50. To parse the d attribute, use PathParser::Parse.

If the letter is uppercase, the coordinates that follow are absolute coordinates. If the letter is lowercase, the coordinates are relative to the current point.

Command	Function	Parameters	Description
M	PathSpline::moveTo	(x y)+	Start a new sub-path at (x, y). If additional coordinates follow, they are treated as PathSpline::Builder::lineTo.
Z	PathSpline::closePath		Close the current sub-path by drawing a line from the current point to the starting point of the sub-path.
Line commands
L	PathSpline::lineTo	(x y)+	Draw a line from the current point to (x, y).
H	Horizontal line to	x+	Draw a horizontal line from the current point to (x, currentY).
V	Vertical line to	y+	Draw a vertical line from the current point to (currentX, y).
Cubic Bezier curve commands
C	PathSpline::curveTo	(x1 y1 x2 y2 x y)+	Draw a cubic Bezier curve from the current point to (x, y), using (x1, y1) and (x2, y2) as the control points.
S	Smooth curve to	(x2 y2 x y)+	Draw a cubic Bezier curve from the current point to (x, y), using a reflection of the previous command's control point and (x2, y2) as the control points, creating a smooth curve.
Quadratic Bezier curve commands
Q	Quadratic curve to	(x1 y1 x y)+	Draw a quadratic Bezier curve from the current point to (x, y), using (x1, y1) as the control point.
T	Smooth quadratic curve to	(x y)+	Draw a quadratic Bezier curve from the current point to (x, y), using a reflection of the previous command's control point as the control point, creating a smooth curve.
Elliptical arc commands
A	PathSpline::arcTo	(rx ry x-axis-rotation large-arc-flag sweep-flag x y)+	Draw an elliptical arc from the current point to (x, y), using (rx, ry) as the radii of the ellipse, and x-axis-rotation as the rotation of the ellipse. The large-arc-flag and sweep-flag parameters control the size and orientation of the arc.

See also: https://www.w3.org/TR/SVG2/paths.html#PathData