1.3.1 Instance variables

arc <- close: {none,pie_slice,chord}

Determines how the arc is closed and filled if arc->fill does not equal @nil.

none

Only the arc is visible

chord

The arc and a straight line from arc<-start to arc<-end are displayed

pie_slice

The arc and two start lines from arc<-start and arc<-end to arc<-position are displayed.

arc <- fill: colour|{foreground,background}*

Colour used to fill the arc. When @nil, the arc is not filled. The behaviour of this method is dependent of the value of arc->close:

• none or pie_slice Creates a pie_slice. If arc->close is none no line is painted around the straight edges of the slice.
• chord Fills the area between a straight line connecting arc<-start and arc<-end and the arc.

arc <- position: point

The arc->position describes the center of the ellipse the arc is part of.

arc <- size: size

The arc->size describes the width and height of the ellipse the arc is part of. Note that (currently) the axes of the ellipse are always horizontal and vertical.

arc <- size_angle: num

Describes the angle in degrees of the ellipse segment. Positive values are counter clockwise.

arc <- start_angle: num

Describes the starting angle of the arc in degrees. 0 degrees denotes 3 o'clock. Positive values are anti-clockwise.

The position of the starting point may be requested with arc<-start.