AlArcAttributes

Interface to Alias arc curve attributes.

Synopsis

#include <AlArcAttributes.h>
class AlArcAttributes : public AlAttributes
virtual AlObjectType	type() const;
AlObject*	copyWrapper() const;
statusCode	centerPoint(double&, double&, double&) const;
statusCode	startPoint(double&, double&, double&) const;
statusCode	endPoint(double&, double&, double&) const;
double	sweep() const;
double	radius() const;
statusCode	calculateStartAndEndAngles( double& start_angle, double&
end_angle, double xaxis[3], 
double yaxis[3], double zaxis[3]);
statusCode	setStartPoint(double, double, double);
statusCode	setEndPoint(double, double, double);
statusCode	setSweepFromStartPoint(double);
statusCode	setSweepFromEndPoint(double);
statusCode	setRadius(double);

Description

AlArcAttributes is a class derived from the AlAttributes class. This class allows access to the attributes for an arc.

The attributes that define an arc are its radius, sweep angle, center point, start point, and end point. Coordinates are given in object space, and not world space.

AlObjectType AlArcAttributes::type() const

Description

Returns the class identifier ’kArcAttributeType’.

AlObject* AlArcAttributes::copyWrapper() const

Description

Makes a copy of the AlArcAttributes. The returned AlArcAttributes will reference the same data as the original.

statusCode AlArcAttributes::centerPoint(double& x, double& y, double& z) const

Description

Returns the center point for the arc. Note that there is no "set" method for the center point. The center point is moved by changing the arc’s radius.

Arguments

> double& x - center point x coordinate

> double& y - center point y coordinate

> double& z - center point z coordinate

Return Codes

sSuccess - the center point was successfully returned

sInvalidObject - the attribute was invalid

statusCode AlArcAttributes::startPoint(double& x, double& y, double& z) const

Description

Returns the point where the arc starts.

Arguments

> double& x - start point x coordinate

> double& y - start point y coordinate

> double& z - start point z coordinate

Return Codes

sSuccess - the start point was successfully returned

sInvalidObject - the attribute was invalid

statusCode AlArcAttributes::endPoint(double& x, double& y, double& z) const

Description

Returns the point where the arc ends.

Arguments

> double& x - end point x coordinate

> double& y - end point y coordinate

> double& z - end point z coordinate

Return Codes

sSuccess - the start point was successfully returned

sInvalidObject - the attribute was invalid

double AlArcAttributes::sweep() const

Description

Returns the number of degrees in the arc. Zero is returned if the attribute is not valid.

double AlArcAttributes::radius() const

Description

Returns the radius of the arc. Zero is returned if the attribute is not valid.

statusCode AlArcAttributes::calculateStartAndEndAngles( double& start_angle, double& end_angle, double xaxis[3], double yaxis[3], double zaxis[3] )

Description

This function will convert the attribute information to start and end angle format. The start and end angles are rotated by the axis into their correct position.

Arguments

> x,y,z axis

> start and end angle

Return code

sSuccess - Converting the data succeeded

sInvalidObject - the attribute was invalid

sFailure - Conversion failed

statusCode AlArcAttributes::setStartPoint(double x, double y, double z)

Description

Moves the start point of the arc. Changing the start point changes the size of the sweep, and if the new start point is not on the circle about the arc’s center point, the center point is moved.

Arguments

< double x - start point x coordinate

< double y - start point y coordinate

< double z - start point z coordinate

Return code

sSuccess - setting the start point succeeded

sInvalidObject - the attribute was not valid

sFailure - setting the start point failed

statusCode AlArcAttributes::setEndPoint(double x, double y, double z)

Description

Moves the end point of the arc. Changing the end point changes the size of the sweep, and if the new end point is not on the circle about the arc’s center point, the center point is moved.

Arguments

< double x - end point x coordinate

< double y - end point y coordinate

< double z - end point z coordinate

Return code

sSuccess - setting the end point succeeded

sInvalidObject - the attribute was invalid

sFailure - setting the end point failed

statusCode AlArcAttributes::setSweepFromStartPoint(double sweep)

Description

Changes the sweep of the arc from the start point. This operation will move the end point. The sweep is given in degrees.

Arguments

< sweep - the sweep from the start point (in degrees)

Return code

sSuccess - setting the sweep succeeded

sInvalidObject - the attribute was invalid

sFailure - setting the sweep failed

statusCode AlArcAttributes::setSweepFromEndPoint(double sweep)

Description

Changes the sweep of the arc from the end point. This operation will move the start point. The sweep is given in degrees.

Arguments

< sweep - the sweep from the end point (in degrees)

Return code

sSuccess - setting the sweep succeeded

sInvalidObject - the attribute was invalid

sFailure - setting the sweep failed

statusCode AlArcAttributes::setRadius(double radius)

Description

Change the radius for the arc. This operation will move the center point for the arc.

Arguments

< radius - the radius of the arc

Return code

sSuccess - setting the sweep succeeded

sInvalidObject - the attribute was invalid

sFailure - setting the sweep failed