Mac OSX 
 addtogroup renderer_interfaces Rendering Engine Interfaces
 @{


 One of a number of interfaces (all starting with nsISVGRenderer*)
 to be implemented by an SVG rendering engine. See nsISVGRenderer
 for more details.

 This interface is used by an nsISVGRendererPathGeometry object in
 a call to nsISVGPathGeometrySource::constructPath() to obtain a
 native representation of the path described by
 nsISVGPathGeometrySource.
[scriptable, uuid(c3cd294e-39ae-4718-b2bc-87c0fad97a12)]
interface nsISVGRendererPathBuilder : nsISupports

Methods

 Draw an elliptical arc from the current position to
 (x,y). Advance current position to (x,y).

 @param x            X-coordinate of end point (untransformed).
 @param y            Y-coordinate of end point (untransformed).
 @param r1           Radius of ellipse in X direction (untransformed).
 @param r2           Radius of ellipse in Y direction (untransformed).
 @param angle        Rotation of ellipse as a whole (untransformed).
 @param largeArcFlag PR_TRUE: choose the large arc (>=180 degrees),
                     PR_FALSE: choose the smaller arc (<=180 degrees)
 @param sweepFlag    PR_TRUE: sweep in positive angle direction,
                     PR_FALSE: sweep in negative angle direction
void arcto(in float x, in float y, in float r1, in float r2, in float angle, in boolean largeArcFlag, in boolean sweepFlag) 
 Close the current subpath. Move current position back to
 beginning of subpath.

 @param newX X-coordinate of new current position (untransformed).
 @param newY Y-coordinate of new current position (untransformed).
void closePath(out float newX, out float newY) 
 Draw cubic Bezier curve from the current position to (x,y) using
 (x1,y1) as the control point at the beginning og the curve and
 (x2,y2) as the control point at the end of the curve. Advance
 current position to (x,y).

 @param x  X-coordinate of end point (untransformed).
 @param y  Y-coordinate of end point (untransformed).
 @param x1 X-coordinate of first control point (untransformed).
 @param y1 Y-coordinate of first control point (untransformed).
 @param x2 X-coordinate of second control point (untransformed).
 @param y2 Y-coordinate of second control point (untransformed).
void curveto(in float x, in float y, in float x1, in float y1, in float x2, in float y2) 
 End the path description. Guaranteed to be the last function
 called.
void endPath() 
 Draw a straight line from the current position to (x,y). Advance
 current position to (x,y).

 @param x X-coordinate of end point (untransformed).
 @param y Y-coordinate of end point (untransformed).
void lineto(in float x, in float y) 
 Move current position and start new sub-path.

 @param x X-coordinate (untransformed).
 @param y Y-coordinate (untransformed).
void moveto(in float x, in float y)