Struct Brush

GoDiagram®
v10.0.11
by Northwoods Software®

A Brush holds color information and describes how to draw the inside of a Shape or the stroke of a shape or a TextBlock or the background of any GraphObject.

Namespace: Northwoods.Go

Assembly: Northwoods.GoDiagram.Avalonia.dll

Syntax

[TypeConverter(typeof(BrushTypeConverter))]
[JsonConverter(typeof(BrushJsonConverter))]
public struct Brush

Remarks

A Brush contains a Paint which describes how the color(s) will be drawn.

Constructors

Brush(Paint)

Constructs a Brush with the given Paint.

Declaration

public Brush(Paint paint)

Parameters

Type	Name	Description
Paint	paint	the Paint for this Brush

Brush(string, (float, string)[])

Constructs a Brush with a GradientPaint.

Declaration

public Brush(string painttype, (float, string)[] stops)

Parameters

Type	Name	Description
string	painttype	a gradient paint type, either "linear" or "radial"
(float, string)[]	stops	an array of tuples mapping fractional stops to color strings

Brush(string)

Constructs a Brush with a SolidPaint.

Declaration

public Brush(string color)

Parameters

Type	Name	Description
string	color	a color string

Properties

Paint

This read-only property returns the Paint this Brush uses for drawing.

Declaration

public readonly Paint Paint { get; }

Property Value

Type	Description
Paint

Methods

Darken(double, ColorSpace)

Modifies all colors within this Brush, darkening them by some fraction.

Declaration

public Brush Darken(double fraction = 0.2, ColorSpace mode = ColorSpace.Lab)

Parameters

Type	Name	Description
double	fraction	Fraction to darken the colors by. Defaults to 0.2, must be between 0 and 1 (inclusive).
ColorSpace	mode	Color space to use for adjusting. Must be Lab or HSL, defaults to Lab.

Returns

Type	Description
Brush	A new Brush with modified color values.

Darken(object)

This is a convenience method for Darken(string, double, ColorSpace) that can be used as a Converter.

Declaration

public static object Darken(object color)

Parameters

Type	Name	Description
object	color

Returns

Type	Description
object

Darken(string, double, ColorSpace)

This static function takes a color and darkens it.

Declaration

public static string Darken(string color, double fraction = 0.2, ColorSpace mode = ColorSpace.Lab)

Parameters

Type	Name	Description
string	color	A valid color string
double	fraction	Fraction to darken the color by. Defaults to 0.2, must be between 0 and 1 (inclusive).
ColorSpace	mode	Color space to use for adjusting. Must be Lab or HSL, defaults to Lab.

Returns

Type	Description
string	A string for the darkened color in RGBA or HSLA.

Equals(object)

Indicates whether the given Brush is equal to this Brush.

Declaration

public override bool Equals(object obj)

Parameters

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

Returns

Type	Description
bool	True if the two Brushes have identical Color and Paint values, false otherwise.

Overrides

ValueType.Equals(object)

GetHashCode()

Creates a hash code for the Brush.

Declaration

public override int GetHashCode()

Returns

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

Overrides

ValueType.GetHashCode()

IsDark()

Determines whether this Brush is "dark."

Declaration

public bool IsDark()

Returns

Type	Description
bool

IsDark(string)

This static function takes a color and determines whether it is "dark." Does not account for transparency.

Declaration

public static bool IsDark(string color)

Parameters

Type	Name	Description
string	color	A valid color string

Returns

Type	Description
bool

Examples

myDiagram.NodeTemplate =
  new Node("Auto")
    .Add(
      new Shape { Figure = "RoundedRectangle", StrokeWidth = 0 }
        .Bind("Fill", "Color"),
      new TextBlock { Margin = 8 }
        .Bind("Stroke", "ColorStr", (c, _) => {
          // Dark nodes use white text, light nodes use black text
          return Brush.IsDark((string)c) ? "white" : "black";
        })
        .Bind("Text", "Key")
    );

IsValidColor(string)

This static function returns true if a given color string is well-formed for drawing.

Declaration

public static bool IsValidColor(string color)

Parameters

Type	Name	Description
string	color	A color string to validate.

Returns

Type	Description
bool

Lighten(double, ColorSpace)

Modifies all colors within this Brush, lightening them by some fraction.

Declaration

public Brush Lighten(double fraction = 0.2, ColorSpace mode = ColorSpace.Lab)

Parameters

Type	Name	Description
double	fraction	Fraction to lighten the colors by. Defaults to 0.2, must be between 0 and 1 (inclusive).
ColorSpace	mode	Color space to use for adjusting. Must be Lab or HSL, defaults to Lab.

Returns

Type	Description
Brush	A new Brush with modified color values.

Lighten(object)

This is a convenience method for Lighten(string, double, ColorSpace) that can be used as a Converter.

Declaration

public static object Lighten(object color)

Parameters

Type	Name	Description
object	color

Returns

Type	Description
object

Lighten(string, double, ColorSpace)

This static function takes a color and lightens it.

Declaration

public static string Lighten(string color, double fraction = 0.2, ColorSpace mode = ColorSpace.Lab)

Parameters

Type	Name	Description
string	color	A valid color string.
double	fraction	Fraction to lighten the colors by. Defaults to 0.2, must be between 0 and 1 (inclusive).
ColorSpace	mode	Color space to use for adjusting. Must be Lab or HSL, defaults to Lab.

Returns

Type	Description
string	A string for the lightened color in RGBA or HSLA.

Mix(string, string, double)

This static function takes two colors and mixes them together, using the (optionally) specified amount of the second color.

Declaration

public static string Mix(string color1, string color2, double fraction = 0.5)

Parameters

Type	Name	Description
string	color1	A valid color string.
string	color2	Another valid color string to mix.
double	fraction	Fraction specifying how much color2 to mix into color1. Defaults to .5, must be between 0 and 1 (inclusive).

Returns

Type	Description
string

RandomColor(int, int)

This static function can be used to generate a random color.

Declaration

public static string RandomColor(int min = 128, int max = 255)

Parameters

Type	Name	Description
int	min	An int between 0 and 255, defaults to 128.
int	max	An int between 0 and 255, defaults to 255.

Returns

Type	Description
string	A color value in # hexadecimal format.

ToString()

Returns a string representation of the Brush.

Declaration

public override string ToString()

Returns

Type	Description
string	A string representation of the current Brush.

Overrides

ValueType.ToString()

Operators

operator ==(Brush, Brush)

Compares if two Brushes are equal by checking their Paints.

Declaration

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

Parameters

Type	Name	Description
Brush	left
Brush	right

Returns

Type	Description
bool

implicit operator Brush(string)

Implicitly converts a string to a Brush.

Declaration

public static implicit operator Brush(string c)

Parameters

Type	Name	Description
string	c

Returns

Type	Description
Brush

operator !=(Brush, Brush)

Compares if two Brushes are not equal by checking their Paints.

Declaration

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

Parameters

Type	Name	Description
Brush	left
Brush	right

Returns

Type	Description
bool