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SG_CIRCLE structure

 

The SG_CIRCLE structure is a circle representaion in three-dimesional space.

 

Has the following fields

 

double radius;  - circle radius

SG_VECTOR  normal; - normal to a circle surface

SG_POINT center; - circle center

 

Has the following methods:

 

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bool   FromCenterRadiusNormal(const SG_POINT& cen, double rad, const SG_VECTOR& nor)

 

Description:

Fills all the fields of the SG_CIRCLE structure with the arguments.

 

Arguments:

cen - circle center,

rad - circle radius,

nor - normal to a surface

 

Returned value:

In case of a zero-radius or if normal to a surface length is zero returns false, otherwise - true

 

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bool FromThreePoints(const SG_POINT& p1, const SG_POINT& p2, const SG_POINT& p3)

 

Description:

Creates a circle in the space by three points.

Arguments:

p1 - first circle point,

p2 - second circle point,

p3 - third circle point,

 

Returned value:

In case the points coinsides or lies on the same line returns false, otherwise - true

 

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bool Draw(SG_DRAW_LINE_FUNC line_func) const

 

Description:

For each line of the segment circle presentation it calls the line_func function.

Enables you to quickly construct a circle without creating a sgCCircle object.

Arguments:

line_func - pointer to the function called for each line of a segment circle presentation

 

Returned value:

In case of a zero argument returns false, otherwise - true.

 

 

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Defined in sg2D.h

 

See also:

SG_POINT SG_VECTOR sgCCircle SG_DRAW_LINE_FUNC