ILArc Interface Reference

This interface represents an arc(LArc object) More...

Inheritance diagram for ILArc:

Public Member Functions
void	Draw (BOOL bFill, HDC hdc, double zoomX, double zoomY, double panX, double panY)
void	FromAnnulusSectorRegion (ILAnnulusSectorRegion *val)
double	GetAngle ()
ILRect *	GetBoundingRect ()
ILPoint *	GetCenter ()
ILCircle *	GetCircle ()
ILPoint *	GetEndPoint ()
double	GetLength ()
ILPoint *	GetStartPoint ()
ILPolygon *	Resample (int num)
void	Set (double x, double y, double r, double aStart, double aEnd)
ILAnnulusSectorRegion *	ToAnnulusSectorRegion (int inExp, int outExp)
ILArc *	Transform (ILTransform *tf)
ILArc *	Translate (double offsetX, double offsetY)
Public Member Functions inherited from ILObject
ILObject *	Copy ()
LPVErrorCode	Load (LString filename)
void	Reset ()
LPVErrorCode	Save (LString filename)
BOOL	Valid ()

Properties
double	EndAngle [get, set]
	The end angle in degrees.
double	Radius [get, set]
	The radius of the imaginary circle.
double	StartAngle [get, set]
	The start angle in degrees. The arc starts clockwise from the StartAngle and ends to EndAngle.
double	X [get, set]
	The x-coordinate of the imaginary circle's center.
double	Y [get, set]
	The y-coordinate of the imaginary circle's center.

Detailed Description

This interface represents an arc(LArc object)

Member Function Documentation

Draw()

void Draw	(	BOOL	bFill,
		HDC	hdc,
		double	zoomX,
		double	zoomY,
		double	panX,
		double	panY
	)

Draw the arc on HDC.

Parameters

[in]

bFill

Whether to fill the arc using current brush.

See also

Use Draw Functions

Remarks

This function is currently not available on Linux / MacOS platform.

FromAnnulusSectorRegion()

void FromAnnulusSectorRegion

(

ILAnnulusSectorRegion *

val

)

Set placement of the arc from the input annulus sector region. The start and end angle is the same as the annulus sector region, the radius is the averaging of the inner and outer radius of the region.

GetAngle()

double GetAngle

(

)

Get the angle size of the arc segment

Return values

result

Return the angle.

GetBoundingRect()

ILRect* GetBoundingRect

(

)

Get the bounding rectangle of all the points

GetCenter()

ILPoint* GetCenter

(

)

Get the center point of the imaginary circle

GetCircle()

ILCircle* GetCircle

(

)

Get the imaginary circle

GetEndPoint()

ILPoint* GetEndPoint

(

)

Get the end point

GetLength()

double GetLength

(

)

Get the length of the arc segment

Return values

result

Return the length.

GetStartPoint()

ILPoint* GetStartPoint

(

)

Get the start point

Resample()

ILPolygon* Resample

(

int

num

)

Resample the arc object into an open polygon of the specified vertex count The start and end point is always kept in the resampled result.

Parameters

[in]

num

The count of the resampled vertexes, at least 2

Return values

result

Return the resampling result polygon

Set()

void Set	(	double	x,
		double	y,
		double	r,
		double	aStart,
		double	aEnd
	)

Set placement of the arc

Parameters

[in]	x	The x-coordinate of the imaginary circle's center point
[in]	y	The y-coordinate of the imaginary circle's center point
[in]	r	The radius of the imaginary circle
[in]	aStart	The start angle in degrees
[in]	aEnd	The end angle in degrees

ToAnnulusSectorRegion()

ILAnnulusSectorRegion* ToAnnulusSectorRegion	(	int	inExp,
		int	outExp
	)

Generate an annulus sector region use the arc object with the given expansion

Parameters

[in]	inExp	The expansion pixels from the imaginary circle's placement that generate the inner radius of the output annulus sector region
[in]	outExp	The expansion pixels from the imaginary circle's placement that generate the outer radius of the output annulus sector region

Return values

val	Return the annulus sector region

Transform()

ILArc* Transform

(

ILTransform *

tf

)

Transform the arc via the given transformation and return a new arc. Note that for an affine or perspective transformation, the result arc's imaginary circle is the bounding circle of the mapping result which may be an ellipse arc.

Parameters

[in]

tf

The transformation.

Return values

Return

the new arc

Translate()

ILArc* Translate	(	double	offsetX,
		double	offsetY
	)

Translate the arc by the given offset and return a new arc

Parameters

[in]	offsetX	The x-coordinate of the offset
[in]	offsetY	The y-coordinate of the offset

Return values

result

Return the new arc