Struct Spot

GoDiagram®
v10.0.12
by Northwoods Software®

A Spot represents a relative point from (0,0) to (1,1) within the bounds of a rectangular area plus an absolute offset.

Namespace: Northwoods.Go

Assembly: Northwoods.GoDiagram.Avalonia.dll

Syntax

[JsonConverter(typeof(SpotJsonConverter))]
public struct Spot

Remarks

Use the static functions Parse(string) and Stringify(Spot) to convert to and from a standard string representation that is independent of the current locale.

Constructors

Spot(double, double, double, double)

The default constructor produces the Spot(0, 0, 0, 0), at the top-left corner.

Declaration

public Spot(double x = 0, double y = 0, double offx = 0, double offy = 0)

Parameters

Type	Name	Description
double	x	The x value of the Spot, a fractional value between zero and one. Default is zero.
double	y	The y value of the Spot, a fractional value between zero and one. Default is zero.
double	offx	(Optional) The absolute x offset. Default is zero.
double	offy	(Optional) The absolute y offset. Default is zero.

Fields

AllSides

The set of points on all sides of the bounding rectangle.

Declaration

public static readonly Spot AllSides

Field Value

Type	Description
Spot

Bottom

The specific point at the middle of the bottom side of bounding rectangle.

Declaration

public static readonly Spot Bottom

Field Value

Type	Description
Spot

BottomLeft

The specific point at the bottom-left corner of the bounding rectangle.

Declaration

public static readonly Spot BottomLeft

Field Value

Type	Description
Spot

BottomLeftSides

The set of points at the left or bottom sides of the bounding rectangle.

Declaration

public static readonly Spot BottomLeftSides

Field Value

Type	Description
Spot

BottomRight

The specific point at the bottom-right corner of the bounding rectangle.

Declaration

public static readonly Spot BottomRight

Field Value

Type	Description
Spot

BottomRightSides

The set of points at the right or bottom sides of the bounding rectangle.

Declaration

public static readonly Spot BottomRightSides

Field Value

Type	Description
Spot

BottomSide

The set of points at the bottom side of the bounding rectangle.

Declaration

public static readonly Spot BottomSide

Field Value

Type	Description
Spot

Center

The specific point at the very center of the bounding rectangle.

Declaration

public static readonly Spot Center

Field Value

Type	Description
Spot

Default

Use this value to indicate that the real spot value is inherited from elsewhere.

Declaration

public static readonly Spot Default

Field Value

Type	Description
Spot

Left

The specific point at the middle of the left side of bounding rectangle.

Declaration

public static readonly Spot Left

Field Value

Type	Description
Spot

LeftRightSides

The set of points at the left or right sides of the bounding rectangle.

Declaration

public static readonly Spot LeftRightSides

Field Value

Type	Description
Spot

LeftSide

The set of points at the left side of the bounding rectangle.

Declaration

public static readonly Spot LeftSide

Field Value

Type	Description
Spot

None

Use this Spot value to indicate no particular spot -- code looking for a particular point on an element will need to do their own calculations to determine the desired point depending on the circumstances.

Declaration

public static readonly Spot None

Field Value

Type	Description
Spot

NotBottomSide

The set of points on all sides of bounding rectangle except bottom side.

Declaration

public static readonly Spot NotBottomSide

Field Value

Type	Description
Spot

NotLeftSide

The set of points on all sides of the bounding rectangle except left side.

Declaration

public static readonly Spot NotLeftSide

Field Value

Type	Description
Spot

NotRightSide

The set of points on all sides of the bounding rectangle except right side.

Declaration

public static readonly Spot NotRightSide

Field Value

Type	Description
Spot

NotTopSide

The set of points on all sides of the bounding rectangle except top side.

Declaration

public static readonly Spot NotTopSide

Field Value

Type	Description
Spot

Right

The specific point at the middle of the right side of bounding rectangle.

Declaration

public static readonly Spot Right

Field Value

Type	Description
Spot

RightSide

The set of points at the right side of the bounding rectangle.

Declaration

public static readonly Spot RightSide

Field Value

Type	Description
Spot

Top

The specific point at the center of the top side of the bounding rectangle.

Declaration

public static readonly Spot Top

Field Value

Type	Description
Spot

TopBottomSides

The set of points at the top or bottom sides of the bounding rectangle.

Declaration

public static readonly Spot TopBottomSides

Field Value

Type	Description
Spot

TopLeft

The specific point at the top-left corner of the bounding rectangle.

Declaration

public static readonly Spot TopLeft

Field Value

Type	Description
Spot

TopLeftSides

The set of points at the top or left sides of the bounding rectangle.

Declaration

public static readonly Spot TopLeftSides

Field Value

Type	Description
Spot

TopRight

The specific point at the top-right corner of the bounding rectangle.

Declaration

public static readonly Spot TopRight

Field Value

Type	Description
Spot

TopRightSides

The set of points at the top or right sides of the bounding rectangle.

Declaration

public static readonly Spot TopRightSides

Field Value

Type	Description
Spot

TopSide

The set of points at the top side of the bounding rectangle.

Declaration

public static readonly Spot TopSide

Field Value

Type	Description
Spot

Properties

OffsetX

Gets or sets the offsetX value of the Spot. The value may be negative. If this represents a side value instead of a specific spot, this value is meaningless.

Declaration

public double OffsetX { readonly get; set; }

Property Value

Type	Description
double

Remarks

A Spot(0,0,5,5) of a large rectangle is near the top-left corner, inside the rectangle. A Spot(1,1,5,5) would be near the bottom-right corner, outside the rectangle. A Spot(1,1,-5,-5) would also be near the bottom-right corner, but inside the rectangle.

OffsetY

Gets or sets the offsetY value of the Spot. The value may be negative. If this represents a side value instead of a specific spot, this value is meaningless.

Declaration

public double OffsetY { readonly get; set; }

Property Value

Type	Description
double

Remarks

A Spot(0,0,5,5) of a large rectangle is near the top-left corner, inside the rectangle. A Spot(1,1,5,5) would be near the bottom-right corner, outside the rectangle. A Spot(1,1,-5,-5) would also be near the bottom-right corner, but inside the rectangle.

X

Gets or sets the x value of the Spot, a fractional value between zero and one.

Declaration

public double X { get; set; }

Property Value

Type	Description
double

Remarks

The Spot(0,0) of a rectangle is at the top-left corner. This value is commonly available as TopLeft. The Spot(0.5,1) would be at the middle of the bottom side. That value is commonly available as Bottom.

Y

Gets or sets the y value of the Spot, a fractional value between zero and one.

Declaration

public double Y { get; set; }

Property Value

Type	Description
double

Remarks

The Spot(0,1) of a rectangle is at the bottom-left corner. This value is commonly available as BottomLeft. The Spot(1,0.5) would be at the middle of the right side. That value is commonly available as Right.

Methods

Equals(object)

Two spots are equal if all four property values are the same.

Declaration

public override bool Equals(object obj)

Parameters

Type	Name	Description
object	obj	The Spot to compare to the current Spot.

Returns

Type	Description
bool	True if the two spots are equal, false otherwise.

Overrides

ValueType.Equals(object)

GetHashCode()

Creates a hash code for the spot.

Declaration

public override int GetHashCode()

Returns

Type	Description
int	A hash code for the current spot structure.

Overrides

ValueType.GetHashCode()

IncludesSide(Spot)

This predicate is true if this Spot is a side that includes the side(s) given by the argument Spot.

Declaration

public bool IncludesSide(Spot side)

Parameters

Type	Name	Description
Spot	side

Returns

Type	Description
bool	false if either this Spot or the argument Spot is not a "Side"; true if the side(s) that this Spot represents are a superset or the same set of sides represented by the argument Spot.

IsDefault()

True if this is a special spot indicating that the real spot value will come from another source.

Declaration

public bool IsDefault()

Returns

Type	Description
bool

IsNone()

True if this is a special spot referring to no particular spot or side.

Declaration

public bool IsNone()

Returns

Type	Description
bool

IsNoSpot()

True if this is an unspecific special spot, such as None or one of the sides.

Declaration

public bool IsNoSpot()

Returns

Type	Description
bool

IsSide()

True if this is a special spot referring to one (or more) of the sides. This is false if the spot is None.

Declaration

public bool IsSide()

Returns

Type	Description
bool

IsSpot()

True if this is a specific spot, not a side nor None.

Declaration

public bool IsSpot()

Returns

Type	Description
bool

Opposite()

Return a new spot that is opposite this spot.

Declaration

public Spot Opposite()

Returns

Type	Description
Spot

Remarks

The X and Y values will be an equal distance away from the center on the other side of the center. The OffsetX and OffsetY values are also negated.

The result is meaningless if IsNoSpot() is true.

Parse(object)

This is a convenience method for Parse(string) that can be used as a Converter.

Declaration

public static object Parse(object str)

Parameters

Type	Name	Description
object	str

Returns

Type	Description
object

Parse(string)

This static method can be used to read in a Spot from a string that was produced by Stringify(Spot).

Declaration

public static Spot Parse(string str)

Parameters

Type	Name	Description
string	str

Returns

Type	Description
Spot

Remarks

Spot.Parse("0 1 2 3") produces the Spot new Spot(0, 1, 2, 3).

Stringify(Spot)

This static method can be used to write out a Spot as a string that can be read by Parse(string).

Declaration

public static string Stringify(Spot val)

Parameters

Type	Name	Description
Spot	val

Returns

Type	Description
string

Remarks

Spot.Stringify(new Spot(0, 1, 2, 3)) produces the string "0 1 2 3".

Stringify(object)

This is a convenience method for Stringify(Spot) that can be used as a BackConverter.

Declaration

public static object Stringify(object spot)

Parameters

Type	Name	Description
object	spot

Returns

Type	Description
object

ToString()

Returns a string representation of the spot.

Declaration

public override string ToString()

Returns

Type	Description
string	A string representation of the current spot.

Overrides

ValueType.ToString()

Operators

operator ==(Spot, Spot)

Declaration

public static bool operator ==(Spot left, Spot right)

Parameters

Type	Name	Description
Spot	left
Spot	right

Returns

Type	Description
bool

operator !=(Spot, Spot)

Declaration

public static bool operator !=(Spot left, Spot right)

Parameters

Type	Name	Description
Spot	left
Spot	right

Returns

Type	Description
bool