PtArc

Gamma/Photon: Using Gamma™ with the Photon microGUIŽ, Version 4.0
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Synopsis

class PtArc PtGraphic
{
    arc_end;      // unsigned short  (Pt_ARG_ARC_END)    
    arc_start;    // unsigned short  (Pt_ARG_ARC_START)    
    arc_type;     // unsigned short  (Pt_ARG_ARC_TYPE)    
}

Base Classes

PtWidget <-- PtBasic <-- PtGraphic <-- PtArc

Description

This widget is an arc of an ellipse, defined by its point of origin, bounding rectangle, and start and end angles.

The point of origin accesses the inherited origin variable, which is a single PtPoint. The bounding rectangle is determined by two PtPoints (relative to the origin), or by the values of the inherited dim variable. The default arc is a full circle with start and end points at the same point: 0 degrees, the point horizontal to the centroid of the ellipse.

There are three types of fill: empty (open curve), chord, or pie-shaped, specified by their respective variables as explained below.

For detailed information, please refer to PtArc in the Photon documentation.

Instance Variables

arc_end

A number specifying the end angle of the arc, in tenths of degrees.

arc_start

A number specifying the start angle of the arc, in tenths of degrees.

arc_type

A constant that controls the type of arc: open curve, closed pie-shaped, or closed with a chord. Default is Pt_ARC_CURVE.

This instance variable may have one of the following values:

Constant	Description
`Pt_ARC_CURVE`	An unclosed, unfilled curve; the default.
`Pt_ARC_PIE`	A curve closed by two lines that connect the end points to the centroid of the arc, like a piece of pie.
`Pt_ARC_CHORD`	A curve closed by a line connecting the two end points.

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