Color
require(["esri/Color"], function(Color) { /* code goes here */ });
esri/Color
Creates a new color object by passing either a hex, rgb(a), hsl(a) or named color value. Hex, hsl(a) and named color values can be passed as a string:
// Examples for green
var color = new Color("green"); // named value
var color = new Color("#00FF00"); // hex value
var color = new Color("hsl(120, 100%, 50%)"); // hsl
var color = new Color("hsla(120, 100%, 50%, 0.5)"); // hsla
RGB values can be passed in as either an array, a string or an object:
// Examples for green
var color = new Color([0, 255, 0]);
var color = new Color([0, 255, 0, 0.5]);
var color = new Color("rgb(0, 255, 0)");
var color = new Color("rgba(0, 255, 0, 0.5)");
var color = new Color({r: 0, g: 255, b: 0});
var color = new Color({r: 0, g: 255, b: 0, a: 0.5});
The alpha-channel (opacity) in rgba and hsla can have a value between 0.0 (fully transparent) and 1.0 (fully opaque).
Constructors
- new Color(color)
- Parameter:
The color to create. This parameter can be a string representing a named color or a hex value; an array of three or four numbers representing r, g, b, a values; or an object with r, g, b, a properties.
Example:// Creates a green Color object using a named value var color = new Color("green"); // Creates a green Color object using a hex value var color = new Color("00FF00"); // Creates a new Color object using an array of r, g, b values var color = new Color([125, 255, 13]); // Add a fourth value to the array to add opacity (range between 0 and 1) var color = new Color([125, 255, 13, 0.5]); // Creates a new Color object using an object var color = new Color({ r: 125, g: 255, b: 13, a: 0.3 // Optional });
Property Overview
Name | Type | Summary | Class | |
---|---|---|---|---|
Number | The alpha value. more details | more details | Color | |
Number | The blue value. more details | more details | Color | |
Number | The green value. more details | more details | Color | |
Number | The red value. more details | more details | Color |
Property Details
- a Number
The alpha value. This value can be any number between
0
and1
and represents the opacity of the Color.0
indicates the color is fully transparent and1
indicates it is fully opaque.
- b Number
The blue value. This value can range between
0
and255
.
- g Number
The green value. This value can range between
0
and255
.
- r Number
The red value. This value can range between
0
and255
.
Method Overview
Name | Return Type | Summary | Class | |
---|---|---|---|---|
Color | Creates a Color instance by blending two colors using a weight factor. more details | more details | Color | |
Color | Creates a deep clone of the Color instance. more details | more details | Color | |
Color | Creates a Color instance using a 3 or 4 element array, mapping each element in sequence to the rgb(a) values of the color. more details | more details | Color | |
Color | Creates a Color instance from a hex string with a '#' prefix. more details | more details | Color | |
Color | Creates a new Color instance, and initializes it with values from a JSON object. more details | more details | Color | |
Color | Creates a Color instance from a string of the form "rgb()" or "rgba()". more details | more details | Color | |
Color | Creates a Color instance by parsing a generic string. more details | more details | Color | |
Color | Takes an array of rgb(a) values, named string, hex string or an hsl(a) string, an object with | more details | Color | |
String | Returns a CSS color string in rgba form representing the Color instance. more details | more details | Color | |
String | Returns a CSS color string in hexadecimal form that represents the Color instance. more details | more details | Color | |
Object | Returns a JSON object with all the values from a Color instance. more details | more details | Color | |
Number[] | Returns a 3-component array of rgb values that represent the Color instance. more details | more details | Color | |
Number[] | Returns a 4-component array of rgba values that represent the Color instance. more details | more details | Color |
Method Details
Creates a Color instance by blending two colors using a weight factor. Optionally accepts a Color object to update and return instead of creating a new object.
Parameters:start ColorThe start color.
end ColorThe end color.
weight NumberThe weight value is a number from 0 to 1, with 0.5 being a 50/50 blend.
out ColoroptionalA previously allocated Color object to reuse for the result.
Returns:Type Description Color Returns a new Color object. Example:var startColor = new Color("#0000FF"); var endColor = new Color("#CA0013"); var blendedColor = Color.blendColors(startColor, endColor, 0.5);
- clone(){Color}
Creates a deep clone of the Color instance.
Returns:Type Description Color A deep clone of the Color instance. Example:// Creates a deep clone of the graphic's color var colorClone = graphic.symbol.color.clone();
Creates a Color instance using a 3 or 4 element array, mapping each element in sequence to the rgb(a) values of the color. Optionally accepts a Color object to update with the color value and return instead of creating a new object.
Parameters:The input array.
obj ColoroptionalA previously allocated Color object to reuse for the result.
Returns:Type Description Color Returns a new Color object. Example:var redColor = Color.fromArray([201, 0, 19]);
Creates a Color instance from a hex string with a '#' prefix. Supports 12-bit #rgb shorthand. Optionally accepts a Color object to update with the parsed value and return instead of creating a new object.
Parameters:color StringThe input color in a hex string.
obj ColoroptionalA previously allocated Color object to reuse for the result.
Returns:Type Description Color Returns a new Color object. Example:var redColor = Color.fromHex("#CA0013");
Creates a new Color instance, and initializes it with values from a JSON object.
Parameter:json ObjectA JSON representation of the instance.
Returns:Type Description Color A new Color instance.
Creates a Color instance from a string of the form "rgb()" or "rgba()". Optionally accepts a Color object to update with the parsed value and return instead of creating a new object.
Parameters:color StringThe input color in a string of the form "rgb()" or "rgba()".
out ColoroptionalA previously allocated Color object to reuse for the result.
Returns:Type Description Color Returns a new Color object. Example:var redColor = Color.fromRgb("rgb(202,0,19)");
Creates a Color instance by parsing a generic string. Accepts hex, rgb, and rgba style color values. Optionally accepts a Color object to update with the parsed value and return instead of creating a new object.
Parameters:str StringThe input value.
obj ColoroptionalA previously allocated Color object to reuse for the result.
Returns:Type Description Color Returns a new Color object. Example:var redColor = Color.fromString("blue");
- setColor(color){Color}
Takes an array of rgb(a) values, named string, hex string or an hsl(a) string, an object with
r
,g
,b
, anda
properties, or a Color object and sets this color instance to the input value.Parameter:The new color value. This parameter can be a string representing a named color or a hex value; an array of three or four numbers representing r, g, b, a values; or an object with r, g, b, a properties.
Returns:Type Description Color Sets the Color instance used to call this method to the new color.
- toCss(includeAlpha){String}
Returns a CSS color string in rgba form representing the Color instance.
Parameter:includeAlpha BooleanoptionalIf
true
, the alpha value will be included in the result.Returns:Type Description String A CSS color string in rgba form that represents the Color instance used to call this method.
- toHex(){String}
Returns a CSS color string in hexadecimal form that represents the Color instance.
Returns:Type Description String A CSS color string in hexadecimal form that represents the Color instance used to call this method.
- toJSON(){Object}
Returns a JSON object with all the values from a Color instance.
Returns:Type Description Object A JSON representation of the Color instance.