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* Paper.js - The Swiss Army Knife of Vector Graphics Scripting.
* http://paperjs.org/
*
* Copyright (c) 2011 - 2020, Jürg Lehni & Jonathan Puckey
* http://juerglehni.com/ & https://puckey.studio/
*
* Distributed under the MIT license. See LICENSE file for details.
*
* All rights reserved.
*/
// TODO: remove eslint-disable comment and deal with errors over time
/* eslint-disable */
import { ref } from '~/globals';
import { Base } from '~/straps';
import { CanvasProvider } from '~/canvas/CanvasProvider';
import { Point } from '~/basic/Point';
import { Change } from '~/item/ChangeFlag';
import { Formatter } from '~/util/Formatter';
import { Gradient } from './Gradient';
/**
* @name Color
*
* @class All properties and functions that expect color values in the form
* of instances of Color objects, also accept named colors and hex values as
* strings which are then converted to instances of
* {@link Color} internally.
*
* @classexample {@paperscript}
* // Named color values:
*
* // Create a circle shaped path at {x: 80, y: 50}
* // with a radius of 30.
* var circle = new Path.Circle(new Point(80, 50), 30);
*
* // Pass a color name to the fillColor property, which is internally
* // converted to a Color.
* circle.fillColor = 'green';
*
* @classexample {@paperscript}
* // Hex color values:
*
* // Create a circle shaped path at {x: 80, y: 50}
* // with a radius of 30.
* var circle = new Path.Circle(new Point(80, 50), 30);
*
* // Pass a hex string to the fillColor property, which is internally
* // converted to a Color.
* circle.fillColor = '#ff0000';
*/
export const Color = Base.extend(
// @ts-expect-error = 'new' expression, whose target lacks a construct signature
new (function () {
// Link color types to component indices and types:
var types = {
gray: ['gray'],
rgb: ['red', 'green', 'blue'],
hsb: ['hue', 'saturation', 'brightness'],
hsl: ['hue', 'saturation', 'lightness'],
gradient: ['gradient', 'origin', 'destination', 'highlight'],
};
// Parsers of values for setters, by type and property
var componentParsers = {},
// Cache and canvas context for color name lookup
namedColors = {
// node-canvas appears to return wrong values for 'transparent'.
// Fix it by having it pre-cashed here:
transparent: [0, 0, 0, 0],
},
colorCtx;
function fromCSS(string) {
var match =
string.match(/^#([\da-f]{2})([\da-f]{2})([\da-f]{2})([\da-f]{2})?$/i) ||
string.match(/^#([\da-f])([\da-f])([\da-f])([\da-f])?$/i),
type = 'rgb',
components;
if (match) {
// Hex with optional alpha channel:
var amount = match[4] ? 4 : 3;
components = new Array(amount);
for (var i = 0; i < amount; i++) {
var value = match[i + 1];
components[i] = parseInt(value.length == 1 ? value + value : value, 16) / 255;
}
} else if ((match = string.match(/^(rgb|hsl)a?\((.*)\)$/))) {
// RGB / RGBA or HSL / HSLA
type = match[1];
components = match[2].trim().split(/[,\s]+/g);
var isHSL = type === 'hsl';
for (var i = 0, l = Math.min(components.length, 4); i < l; i++) {
var component = components[i];
// Use `parseFloat()` instead of `+value` to parse '\d+%' to
// float for HSL:
// @ts-expect-error = Subsequent variable declarations must have the same type
var value = parseFloat(component);
if (isHSL) {
if (i === 0) {
// handle 'deg', 'turn', 'rad' 'grad':
var unit = component.match(/([a-z]*)$/)[1];
value *=
{
turn: 360,
rad: 180 / Math.PI,
grad: 0.9, // 360 / 400
}[unit] || 1;
} else if (i < 3) {
// Percentages to 0..1
value /= 100;
}
} else if (i < 3) {
// RGB color values to 0..1
value /= /%$/.test(component) ? 100 : 255;
}
components[i] = value;
}
} else {
// Named
var color = namedColors[string];
if (!color) {
if (globalThis.window) {
// Use a canvas to draw with the given name, then retrieve
// RGB values and build a cache for all the used colors.
if (!colorCtx) {
colorCtx = CanvasProvider.getContext(1, 1, {
willReadFrequently: true,
});
colorCtx.globalCompositeOperation = 'copy';
}
// Set the current fillStyle to transparent, so that it will be
// transparent instead of the previously set color in case the
// new color can not be interpreted.
colorCtx.fillStyle = 'rgba(0,0,0,0)';
// Set the fillStyle of the context to the passed name and fill
// the canvas with it, then retrieve the data for the drawn
// pixel:
colorCtx.fillStyle = string;
colorCtx.fillRect(0, 0, 1, 1);
var data = colorCtx.getImageData(0, 0, 1, 1).data;
color = namedColors[string] = [data[0] / 255, data[1] / 255, data[2] / 255];
} else {
// Web-workers can't resolve CSS color names, for now.
// TODO: Find a way to make this work there too?
color = [0, 0, 0];
}
}
components = color.slice();
}
return [type, components];
}
// For hsb-rgb conversion, used to lookup the right parameters in the
// values array.
var hsbIndices = [
[0, 3, 1], // 0
[2, 0, 1], // 1
[1, 0, 3], // 2
[1, 2, 0], // 3
[3, 1, 0], // 4
[0, 1, 2], // 5
];
// Calling convention for converters:
// The components are passed as an arguments list, and returned as an array.
// alpha is left out, because the conversion does not change it.
var converters = {
'rgb-hsb': function (r, g, b) {
var max = Math.max(r, g, b),
min = Math.min(r, g, b),
delta = max - min,
h =
delta === 0
? 0
: (max == r ? (g - b) / delta + (g < b ? 6 : 0) : max == g ? (b - r) / delta + 2 : (r - g) / delta + 4) *
60; // max == b
return [h, max === 0 ? 0 : delta / max, max];
},
'hsb-rgb': function (h, s, b) {
// Scale h to 0..6 with modulo for negative values too
h = (((h / 60) % 6) + 6) % 6;
var i = Math.floor(h), // 0..5
f = h - i,
// @ts-expect-error = Subsequent variable declarations must have the same type
i = hsbIndices[i],
v = [
b, // b, index 0
b * (1 - s), // p, index 1
b * (1 - s * f), // q, index 2
b * (1 - s * (1 - f)), // t, index 3
];
return [v[i[0]], v[i[1]], v[i[2]]];
},
// HSL code is based on:
// http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
'rgb-hsl': function (r, g, b) {
var max = Math.max(r, g, b),
min = Math.min(r, g, b),
delta = max - min,
achromatic = delta === 0,
h = achromatic
? 0
: (max == r ? (g - b) / delta + (g < b ? 6 : 0) : max == g ? (b - r) / delta + 2 : (r - g) / delta + 4) *
60, // max == b
l = (max + min) / 2,
s = achromatic ? 0 : l < 0.5 ? delta / (max + min) : delta / (2 - max - min);
return [h, s, l];
},
'hsl-rgb': function (h, s, l) {
// Scale h to 0..1 with modulo for negative values too
h = (((h / 360) % 1) + 1) % 1;
if (s === 0) return [l, l, l];
var t3s = [h + 1 / 3, h, h - 1 / 3],
t2 = l < 0.5 ? l * (1 + s) : l + s - l * s,
t1 = 2 * l - t2,
c = [];
for (var i = 0; i < 3; i++) {
var t3 = t3s[i];
if (t3 < 0) t3 += 1;
if (t3 > 1) t3 -= 1;
c[i] =
6 * t3 < 1
? t1 + (t2 - t1) * 6 * t3
: 2 * t3 < 1
? t2
: 3 * t3 < 2
? t1 + (t2 - t1) * (2 / 3 - t3) * 6
: t1;
}
return c;
},
'rgb-gray': function (r, g, b) {
// Using the standard NTSC conversion formula that is used for
// calculating the effective luminance of an RGB color:
// http://www.mathworks.com/support/solutions/en/data/1-1ASCU/index.html?solution=1-1ASCU
return [r * 0.2989 + g * 0.587 + b * 0.114];
},
'gray-rgb': function (g) {
return [g, g, g];
},
'gray-hsb': function (g) {
return [0, 0, g];
},
'gray-hsl': function (g) {
// TODO: Is lightness really the same as brightness for gray?
return [0, 0, g];
},
'gradient-rgb': function (/* gradient */) {
// TODO: Implement
return [];
},
'rgb-gradient': function (/* r, g, b */) {
// TODO: Implement
return [];
},
};
// Produce getters and setter methods for the various color components known
// by the different color types. Requesting any of these components on any
// color internally converts the color to the required type and then returns
// its component.
return Base.each(
types,
function (properties, type) {
// Keep track of parser functions per type.
componentParsers[type] = [];
Base.each(
properties,
function (name, index) {
var part = Base.capitalize(name),
// Both hue and saturation have overlapping properties between
// hsb and hsl. Handle this here separately, by testing for
// overlaps and skipping conversion if the type is /hs[bl]/
hasOverlap = /^(hue|saturation)$/.test(name),
// Produce value parser function for the given type / property
parser = (componentParsers[type][index] =
type === 'gradient'
? name === 'gradient'
? // gradient property of gradient color:
function (value) {
var current = this._components[0];
value = Gradient.read(Array.isArray(value) ? value : arguments, 0, { readNull: true });
if (current !== value) {
if (current) current._removeOwner(this);
if (value) value._addOwner(this);
}
return value;
}
: // all other (point) properties of gradient color:
function (/* value */) {
return Point.read(arguments, 0, {
readNull: name === 'highlight',
clone: true,
});
}
: // Normal number component properties:
function (value) {
// NOTE: We don't clamp values here, they're only
// clamped once the actual CSS values are produced.
// Gotta love the fact that isNaN(null) is false,
// while isNaN(undefined) is true.
return value == null || isNaN(value) ? 0 : +value;
});
this['get' + part] = function () {
return this._type === type || (hasOverlap && /^hs[bl]$/.test(this._type))
? this._components[index]
: this._convert(type)[index];
};
this['set' + part] = function (value) {
// Convert to the requrested type before setting the value
if (this._type !== type && !(hasOverlap && /^hs[bl]$/.test(this._type))) {
this._components = this._convert(type);
this._properties = types[type];
this._type = type;
}
this._components[index] = parser.call(this, value);
this._changed();
};
},
this
);
},
/** @lends Color# */ {
_class: 'Color',
// Tell Base.read that the Point constructor supports reading with index
_readIndex: true,
/**
* Creates a RGB Color object.
*
* @name Color#initialize
* @param {Number} red the amount of red in the color as a value between
* `0` and `1`
* @param {Number} green the amount of green in the color as a value
* between `0` and `1`
* @param {Number} blue the amount of blue in the color as a value
* between `0` and `1`
* @param {Number} [alpha] the alpha of the color as a value between `0`
* and `1`
*
* @example {@paperscript}
* // Creating a RGB Color:
*
* // Create a circle shaped path at {x: 80, y: 50}
* // with a radius of 30:
* var circle = new Path.Circle(new Point(80, 50), 30);
*
* // 100% red, 0% blue, 50% blue:
* circle.fillColor = new Color(1, 0, 0.5);
*/
/**
* Creates a gray Color object.
*
* @name Color#initialize
* @param {Number} gray the amount of gray in the color as a value
* between `0` and `1`
* @param {Number} [alpha] the alpha of the color as a value between `0`
* and `1`
*
* @example {@paperscript}
* // Creating a gray Color:
*
* // Create a circle shaped path at {x: 80, y: 50}
* // with a radius of 30:
* var circle = new Path.Circle(new Point(80, 50), 30);
*
* // Create a GrayColor with 50% gray:
* circle.fillColor = new Color(0.5);
*/
/**
* Creates a HSB, HSL or gradient Color object from the properties of
* the provided object:
*
* @option hsb.hue {Number} the hue of the color as a value in degrees
* between `0` and `360`
* @option hsb.saturation {Number} the saturation of the color as a
* value between `0` and `1`
* @option hsb.brightness {Number} the brightness of the color as a
* value between `0` and `1`
* @option hsb.alpha {Number} the alpha of the color as a value between
* `0` and `1`
*
* @option hsl.hue {Number} the hue of the color as a value in degrees
* between `0` and `360`
* @option hsl.saturation {Number} the saturation of the color as a
* value between `0` and `1`
* @option hsl.lightness {Number} the lightness of the color as a value
* between `0` and `1`<br>
* @option hsl.alpha {Number} the alpha of the color as a value between
* `0` and `1`
*
* @option gradient.gradient {Gradient} the gradient object that
* describes the color stops and type of gradient to be used
* @option gradient.origin {Point} the origin point of the gradient
* @option gradient.destination {Point} the destination point of the
* gradient
* @option gradient.stops {GradientStop[]} the gradient stops describing
* the gradient, as an alternative to providing a gradient object
* @option gradient.radial {Boolean} controls whether the gradient is
* radial, as an alternative to providing a gradient object
*
* @name Color#initialize
* @param {Object} object an object describing the components and
* properties of the color
*
* @example {@paperscript}
* // Creating a HSB Color:
*
* // Create a circle shaped path at {x: 80, y: 50}
* // with a radius of 30:
* var circle = new Path.Circle(new Point(80, 50), 30);
*
* // Create an HSB Color with a hue of 90 degrees, a saturation
* // 100% and a brightness of 100%:
* circle.fillColor = { hue: 90, saturation: 1, brightness: 1 };
*
* @example {@paperscript}
* // Creating a HSL Color:
*
* // Create a circle shaped path at {x: 80, y: 50}
* // with a radius of 30:
* var circle = new Path.Circle(new Point(80, 50), 30);
*
* // Create an HSL Color with a hue of 90 degrees, a saturation
* // 100% and a lightness of 50%:
* circle.fillColor = { hue: 90, saturation: 1, lightness: 0.5 };
*
* @example {@paperscript height=200}
* // Creating a gradient color from an object literal:
*
* // Define two points which we will be using to construct
* // the path and to position the gradient color:
* var topLeft = view.center - [80, 80];
* var bottomRight = view.center + [80, 80];
*
* var path = new Path.Rectangle({
* topLeft: topLeft,
* bottomRight: bottomRight,
* // Fill the path with a gradient of three color stops
* // that runs between the two points we defined earlier:
* fillColor: {
* stops: ['yellow', 'red', 'blue'],
* origin: topLeft,
* destination: bottomRight
* }
* });
*/
/**
* Creates a Color object from a CSS string. All common CSS color string
* formats are supported:
* - Named colors (e.g. `'red'`, `'fuchsia'`, …)
* - Hex strings (`'#ffff00'`, `'#ff0'`, …)
* - RGB strings (`'rgb(255, 128, 0)'`, `'rgba(255, 128, 0, 0.5)'`, …)
* - HSL strings (`'hsl(180deg, 20%, 50%)'`,
* `'hsla(3.14rad, 20%, 50%, 0.5)'`, …)
*
* @name Color#initialize
* @param {String} color the color's CSS string representation
*
* @example {@paperscript}
* var circle = new Path.Circle({
* center: [80, 50],
* radius: 30,
* fillColor: new Color('rgba(255, 255, 0, 0.5)')
* });
*/
/**
* Creates a gradient Color object.
*
* @name Color#initialize
* @param {Gradient} gradient
* @param {Point} origin
* @param {Point} destination
* @param {Point} [highlight]
*
* @example {@paperscript height=200}
* // Applying a linear gradient color containing evenly distributed
* // color stops:
*
* // Define two points which we will be using to construct
* // the path and to position the gradient color:
* var topLeft = view.center - [80, 80];
* var bottomRight = view.center + [80, 80];
*
* // Create a rectangle shaped path between
* // the topLeft and bottomRight points:
* var path = new Path.Rectangle(topLeft, bottomRight);
*
* // Create the gradient, passing it an array of colors to be converted
* // to evenly distributed color stops:
* var gradient = new Gradient(['yellow', 'red', 'blue']);
*
* // Have the gradient color run between the topLeft and
* // bottomRight points we defined earlier:
* var gradientColor = new Color(gradient, topLeft, bottomRight);
*
* // Set the fill color of the path to the gradient color:
* path.fillColor = gradientColor;
*
* @example {@paperscript height=200}
* // Applying a radial gradient color containing unevenly distributed
* // color stops:
*
* // Create a circle shaped path at the center of the view
* // with a radius of 80:
* var path = new Path.Circle({
* center: view.center,
* radius: 80
* });
*
* // The stops array: yellow mixes with red between 0 and 15%,
* // 15% to 30% is pure red, red mixes with black between 30% to 100%:
* var stops = [
* ['yellow', 0],
* ['red', 0.15],
* ['red', 0.3],
* ['black', 0.9]
* ];
*
* // Create a radial gradient using the color stops array:
* var gradient = new Gradient(stops, true);
*
* // We will use the center point of the circle shaped path as
* // the origin point for our gradient color
* var from = path.position;
*
* // The destination point of the gradient color will be the
* // center point of the path + 80pt in horizontal direction:
* var to = path.position + [80, 0];
*
* // Create the gradient color:
* var gradientColor = new Color(gradient, from, to);
*
* // Set the fill color of the path to the gradient color:
* path.fillColor = gradientColor;
*/
initialize: function Color(arg) {
// We are storing color internally as an array of components
var args = arguments,
reading = this.__read,
read = 0,
type,
components,
alpha,
values;
// If first argument is an array, replace arguments with it.
if (Array.isArray(arg)) {
// @ts-expect-error = Property 'callee' is missing in type 'any[]'
args = arg;
arg = args[0];
}
// First see if it's a type string argument, and if so, set it and
// shift it out of the arguments list.
var argType = arg != null && typeof arg;
if (argType === 'string' && arg in types) {
type = arg;
arg = args[1];
if (Array.isArray(arg)) {
// Internal constructor that is called with the following
// arguments, without parsing: (type, componets, alpha)
components = arg;
alpha = args[2];
} else {
// For deserialization, shift out and process normally.
if (reading) read = 1; // Will be increased below
// Shift type out of the arguments, and process normally.
args = Base.slice(args, 1);
argType = typeof arg;
}
}
if (!components) {
// Determine if there is a values array
values =
argType === 'number'
? args
: // Do not use Array.isArray() to also support arguments
argType === 'object' && arg.length != null
? arg
: null;
// The various branches below produces a values array if the
// values still need parsing, and a components array if they are
// already parsed.
if (values) {
if (!type)
// type = values.length >= 4
// ? 'cmyk'
// : values.length >= 3
type = values.length >= 3 ? 'rgb' : 'gray';
var length = types[type].length;
alpha = values[length];
if (reading) {
read += values === arguments ? length + (alpha != null ? 1 : 0) : 1;
}
if (values.length > length) values = Base.slice(values, 0, length);
} else if (argType === 'string') {
var converted = fromCSS(arg);
type = converted[0];
components = converted[1];
if (components.length === 4) {
alpha = components[3];
components.length--;
}
} else if (argType === 'object') {
if (arg.constructor === Color) {
type = arg._type;
components = arg._components.slice();
alpha = arg._alpha;
if (type === 'gradient') {
// Clone all points, since they belong to the other
// color already.
for (var i = 1, l = components.length; i < l; i++) {
var point = components[i];
if (point) components[i] = point.clone();
}
}
} else if (arg.constructor === Gradient) {
type = 'gradient';
values = args;
} else {
// Determine type by presence of object property names
type =
'hue' in arg
? 'lightness' in arg
? 'hsl'
: 'hsb'
: 'gradient' in arg || 'stops' in arg || 'radial' in arg
? 'gradient'
: 'gray' in arg
? 'gray'
: 'rgb';
// Convert to array and parse in one loop, for efficiency
var properties = types[type],
parsers = componentParsers[type];
this._components = components = [];
for (var i = 0, l = properties.length; i < l; i++) {
var value = arg[properties[i]];
// Allow implicit definition of gradients through
// stops / radial properties. Conversion happens
// here on the fly:
if (value == null && !i && type === 'gradient' && 'stops' in arg) {
value = {
stops: arg.stops,
radial: arg.radial,
};
}
value = parsers[i].call(this, value);
if (value != null) components[i] = value;
}
alpha = arg.alpha;
}
}
if (reading && type) read = 1;
}
// Default fallbacks: rgb, black
this._type = type || 'rgb';
if (!components) {
// Produce a components array now, and parse values. Even if no
// values are defined, parsers are still called to produce
// defaults.
this._components = components = [];
var parsers = componentParsers[this._type];
for (var i = 0, l = parsers.length; i < l; i++) {
var value = parsers[i].call(this, values && values[i]);
if (value != null) components[i] = value;
}
}
this._components = components;
this._properties = types[this._type];
this._alpha = alpha;
if (reading) this.__read = read;
return this;
},
/**
* Sets the color to the passed values. Note that any sequence of
* parameters that is supported by the various {@link Color()}
* constructors also work for calls of `set()`.
*
* @function
* @param {...*} values
* @return {Color}
*/
set: '#initialize',
_serialize: function (options, dictionary) {
var components = this.getComponents();
return Base.serialize(
// We can omit the type for gray and rgb:
/^(gray|rgb)$/.test(this._type) ? components : [this._type].concat(components),
options,
true,
dictionary
);
},
/**
* Called by various setters whenever a color value changes
*/
_changed: function () {
this._canvasStyle = null;
if (this._owner) {
if (this._setter) {
this._owner[this._setter](this);
} else {
this._owner._changed(/*#=*/ Change.STYLE);
}
}
},
/**
* @return {Number[]} the converted components as an array
*/
_convert: function (type) {
var converter;
return this._type === type
? this._components.slice()
: (converter = converters[this._type + '-' + type])
? converter.apply(this, this._components)
: // Convert to and from rgb if no direct converter exists
converters['rgb-' + type].apply(this, converters[this._type + '-rgb'].apply(this, this._components));
},
/**
* Converts the color to another type.
*
* @param {String} type the color type to convert to. Possible values:
* {@values 'rgb', 'gray', 'hsb', 'hsl'}
* @return {Color} the converted color as a new instance
*/
convert: function (type) {
return new Color(type, this._convert(type), this._alpha);
},
/**
* The type of the color as a string.
*
* @bean
* @type String
* @values 'rgb', 'gray', 'hsb', 'hsl'
*
* @example
* var color = new Color(1, 0, 0);
* console.log(color.type); // 'rgb'
*/
getType: function () {
return this._type;
},
setType: function (type) {
this._components = this._convert(type);
this._properties = types[type];
this._type = type;
},
/**
* The color components that define the color, including the alpha value
* if defined.
*
* @bean
* @type Number[]
*/
getComponents: function () {
var components = this._components.slice();
if (this._alpha != null) components.push(this._alpha);
return components;
},
/**
* The color's alpha value as a number between `0` and `1`.
* All colors of the different subclasses support alpha values.
*
* @bean
* @type Number
* @default 1
*
* @example {@paperscript}
* // A filled path with a half transparent stroke:
* var circle = new Path.Circle(new Point(80, 50), 30);
*
* // Fill the circle with red and give it a 20pt green stroke:
* circle.style = {
* fillColor: 'red',
* strokeColor: 'green',
* strokeWidth: 20
* };
*
* // Make the stroke half transparent:
* circle.strokeColor.alpha = 0.5;
*/
getAlpha: function () {
return this._alpha != null ? this._alpha : 1;
},
setAlpha: function (alpha) {
this._alpha = alpha == null ? null : Math.min(Math.max(alpha, 0), 1);
this._changed();
},
/**
* Checks if the color has an alpha value.
*
* @return {Boolean} {@true if the color has an alpha value}
*/
hasAlpha: function () {
return this._alpha != null;
},
/**
* Checks if the component color values of the color are the
* same as those of the supplied one.
*
* @param {Color} color the color to compare with
* @return {Boolean} {@true if the colors are the same}
*/
equals: function (color) {
var col = Base.isPlainValue(color, true) ? Color.read(arguments) : color;
return (
col === this ||
(col &&
this._class === col._class &&
this._type === col._type &&
this.getAlpha() === col.getAlpha() &&
Base.equals(this._components, col._components)) ||
false
);
},
/**
* @name Color#clone
* @function
*
* Returns a copy of the color object.
*
* @return {Color} a copy of the color object
*/
// NOTE: There is no need to actually implement this, since it's the
// same as Base#clone()
/**
* {@grouptitle String Representations}
* @return {String} a string representation of the color
*/
toString: function () {
var properties = this._properties,
parts = [],
isGradient = this._type === 'gradient',
f = Formatter.instance;
for (var i = 0, l = properties.length; i < l; i++) {
var value = this._components[i];
if (value != null) parts.push(properties[i] + ': ' + (isGradient ? value : f.number(value)));
}
if (this._alpha != null) parts.push('alpha: ' + f.number(this._alpha));
return '{ ' + parts.join(', ') + ' }';
},
/**
* Returns the color as a CSS string.
*
* @param {Boolean} hex whether to return the color in hexadecimal
* representation or as a CSS RGB / RGBA string.
* @return {String} a CSS string representation of the color
*/
toCSS: function (hex) {
// TODO: Support HSL / HSLA CSS3 colors directly, without conversion
var components = this._convert('rgb'),
alpha = hex || this._alpha == null ? 1 : this._alpha;
function convert(val) {
return Math.round((val < 0 ? 0 : val > 1 ? 1 : val) * 255);
}
components = [convert(components[0]), convert(components[1]), convert(components[2])];
if (alpha < 1) components.push(alpha < 0 ? 0 : alpha);
return hex
? '#' + ((1 << 24) + (components[0] << 16) + (components[1] << 8) + components[2]).toString(16).slice(1)
: (components.length == 4 ? 'rgba(' : 'rgb(') + components.join(',') + ')';
},
toCanvasStyle: function (ctx, matrix) {
if (this._canvasStyle) return this._canvasStyle;
// Normal colors are simply represented by their CSS string.
if (this._type !== 'gradient') return (this._canvasStyle = this.toCSS());
// Gradient code form here onwards
var components = this._components,
gradient = components[0],
stops = gradient._stops,
origin = components[1],
destination = components[2],
highlight = components[3],
inverse = matrix && matrix.inverted(),
canvasGradient;
// If the item's content is transformed by a matrix, we need to
// inverse transform the gradient points, as they are defined in
// item's parent coordinate system.
if (inverse) {
origin = inverse._transformPoint(origin);
destination = inverse._transformPoint(destination);
if (highlight) highlight = inverse._transformPoint(highlight);
}
if (gradient._radial) {
var radius = destination.getDistance(origin);
if (highlight) {
var vector = highlight.subtract(origin);
if (vector.getLength() > radius) highlight = origin.add(vector.normalize(radius - 0.1));
}
var start = highlight || origin;
canvasGradient = ctx.createRadialGradient(start.x, start.y, 0, origin.x, origin.y, radius);
} else {
canvasGradient = ctx.createLinearGradient(origin.x, origin.y, destination.x, destination.y);
}
for (var i = 0, l = stops.length; i < l; i++) {
var stop = stops[i],
offset = stop._offset;
// Use the defined offset, and fall back to automatic linear
// calculation.
// NOTE: that if _offset is 0 for the first entry, the fall-back
// will be so too.
canvasGradient.addColorStop(offset == null ? i / (l - 1) : offset, stop._color.toCanvasStyle());
}
return (this._canvasStyle = canvasGradient);
},
/**
* Transform the gradient color by the specified matrix.
*
* @param {Matrix} matrix the matrix to transform the gradient color by
*/
transform: function (matrix) {
if (this._type === 'gradient') {
var components = this._components;
for (var i = 1, l = components.length; i < l; i++) {
var point = components[i];
matrix._transformPoint(point, point, true);
}
this._changed();
}
},
/**
* {@grouptitle RGB Components}
*
* The amount of red in the color as a value between `0` and `1`.
*
* @name Color#red
* @property
* @type Number
*
* @example {@paperscript}
* // Changing the amount of red in a color:
* var circle = new Path.Circle(new Point(80, 50), 30);
* circle.fillColor = 'blue';
*
* // Blue + red = purple:
* circle.fillColor.red = 1;
*/
/**
* The amount of green in the color as a value between `0` and `1`.
*
* @name Color#green
* @property
* @type Number
*
* @example {@paperscript}
* // Changing the amount of green in a color:
* var circle = new Path.Circle(new Point(80, 50), 30);
*
* // First we set the fill color to red:
* circle.fillColor = 'red';
*
* // Red + green = yellow:
* circle.fillColor.green = 1;
*/
/**
* The amount of blue in the color as a value between `0` and `1`.
*
* @name Color#blue
* @property
* @type Number
*
* @example {@paperscript}
* // Changing the amount of blue in a color:
* var circle = new Path.Circle(new Point(80, 50), 30);
*
* // First we set the fill color to red:
* circle.fillColor = 'red';
*
* // Red + blue = purple:
* circle.fillColor.blue = 1;
*/
/**
* {@grouptitle Gray Components}
*
* The amount of gray in the color as a value between `0` and `1`.
*
* @name Color#gray
* @property
* @type Number
*/
/**
* {@grouptitle HSB Components}
*
* The hue of the color as a value in degrees between `0` and `360`.
*
* @name Color#hue
* @property
* @type Number
*
* @example {@paperscript}
* // Changing the hue of a color:
* var circle = new Path.Circle(new Point(80, 50), 30);
* circle.fillColor = 'red';
* circle.fillColor.hue += 30;
*
* @example {@paperscript}
* // Hue cycling:
*
* // Create a rectangle shaped path, using the dimensions
* // of the view:
* var path = new Path.Rectangle(view.bounds);
* path.fillColor = 'red';
*
* function onFrame(event) {
* path.fillColor.hue += 0.5;
* }
*/
/**
* The saturation of the color as a value between `0` and `1`.
*
* @name Color#saturation
* @property
* @type Number
*/
/**
* The brightness of the color as a value between `0` and `1`.
*
* @name Color#brightness
* @property
* @type Number
*/
/**
* {@grouptitle HSL Components}
*
* The lightness of the color as a value between `0` and `1`.
*
* Note that all other components are shared with HSB.
*
* @name Color#lightness
* @property
* @type Number
*/
/**
* {@grouptitle Gradient Components}
*
* The gradient object describing the type of gradient and the stops.
*
* @name Color#gradient
* @property
* @type Gradient
*/
/* The origin point of the gradient.
*
* @name Color#origin
* @property
* @type Point
*
* @example {@paperscript height=200}
* // Move the origin point of the gradient, by moving your mouse over
* // the view below:
*
* // Create a rectangle shaped path with the same dimensions as
* // that of the view and fill it with a gradient color:
* var path = new Path.Rectangle(view.bounds);
* var gradient = new Gradient(['yellow', 'red', 'blue']);
*
* // Have the gradient color run from the top left point of the view,
* // to the bottom right point of the view:
* var from = view.bounds.topLeft;
* var to = view.bounds.bottomRight;
* var gradientColor = new Color(gradient, from, to);
* path.fillColor = gradientColor;
*
* function onMouseMove(event) {
* // Set the origin point of the path's gradient color
* // to the position of the mouse:
* path.fillColor.origin = event.point;
* }
*/
/*
* The destination point of the gradient.
*
* @name Color#destination
* @property
* @type Point
*
* @example {@paperscript height=300}
* // Move the destination point of the gradient, by moving your mouse
* // over the view below:
*
* // Create a circle shaped path at the center of the view,
* // using 40% of the height of the view as its radius
* // and fill it with a radial gradient color:
* var path = new Path.Circle({
* center: view.center,
* radius: view.bounds.height * 0.4
* });
*
* var gradient = new Gradient(['yellow', 'red', 'black'], true);
* var from = view.center;
* var to = view.bounds.bottomRight;
* var gradientColor = new Color(gradient, from, to);
* path.fillColor = gradientColor;
*
* function onMouseMove(event) {
* // Set the origin point of the path's gradient color
* // to the position of the mouse:
* path.fillColor.destination = event.point;
* }
*/
/**
* The highlight point of the gradient.
*
* @name Color#highlight
* @property
* @type Point
*
* @example {@paperscript height=300}
* // Create a circle shaped path at the center of the view,
* // using 40% of the height of the view as its radius
* // and fill it with a radial gradient color:
* var path = new Path.Circle({
* center: view.center,
* radius: view.bounds.height * 0.4
* });
*
* path.fillColor = {
* gradient: {
* stops: ['yellow', 'red', 'black'],
* radial: true
* },
* origin: path.position,
* destination: path.bounds.rightCenter
* };
*
* function onMouseMove(event) {
* // Set the origin highlight of the path's gradient color
* // to the position of the mouse:
* path.fillColor.highlight = event.point;
* }
*/
statics: /** @lends Color */ {
// Export for backward compatibility code below.
_types: types,
/**
* Returns a color object with random {@link #red}, {@link #green}
* and {@link #blue} values between `0` and `1`.
*
* @return {Color} the newly created color object
* @static
*
* @example {@paperscript}
* var circle = new Path.Circle(view.center, 50);
* // Set a random color as circle fill color.
* circle.fillColor = Color.random();
*/
random: function () {
var random = Math.random;
return new Color(random(), random(), random());
},
_setOwner: function (color, owner, setter) {
if (color) {
// Clone color if owner changes:
if (color._owner && owner && color._owner !== owner) {
color = color.clone();
}
// @ts-expect-error = The '^' operator is not allowed for boolean types
if (!color._owner ^ !owner) {
color._owner = owner || null;
color._setter = setter || null;
}
}
return color;
},
},
}
);
})(),
// @ts-expect-error = 'new' expression, whose target lacks a construct signature
new (function () {
var operators = {
add: function (a, b) {
return a + b;
},
subtract: function (a, b) {
return a - b;
},
multiply: function (a, b) {
return a * b;
},
divide: function (a, b) {
return a / b;
},
};
return Base.each(
operators,
function (operator, name) {
this[name] = function (color) {
color = Color.read(arguments);
var type = this._type,
components1 = this._components,
components2 = color._convert(type);
for (var i = 0, l = components1.length; i < l; i++) components2[i] = operator(components1[i], components2[i]);
return new Color(type, components2, this._alpha != null ? operator(this._alpha, color.getAlpha()) : null);
};
},
/** @lends Color# */ {
/**
* Returns the addition of the supplied value to both coordinates of
* the color as a new color.
* The object itself is not modified!
*
* @name Color#add
* @function
* @operator
* @param {Number} number the number to add
* @return {Color} the addition of the color and the value as a new
* color
*
* @example
* var color = new Color(0.5, 1, 1);
* var result = color + 1;
* console.log(result); // { red: 1, blue: 1, green: 1 }
*/
/**
* Returns the addition of the supplied color to the color as a new
* color.
* The object itself is not modified!
*
* @name Color#add
* @function
* @operator
* @param {Color} color the color to add
* @return {Color} the addition of the two colors as a new color
*
* @example
* var color1 = new Color(0, 1, 1);
* var color2 = new Color(1, 0, 0);
* var result = color1 + color2;
* console.log(result); // { red: 1, blue: 1, green: 1 }
*/
/**
* Returns the subtraction of the supplied value to both coordinates of
* the color as a new color.
* The object itself is not modified!
*
* @name Color#subtract
* @function
* @operator
* @param {Number} number the number to subtract
* @return {Color} the subtraction of the color and the value as a new
* color
*
* @example
* var color = new Color(0.5, 1, 1);
* var result = color - 1;
* console.log(result); // { red: 0, blue: 0, green: 0 }
*/
/**
* Returns the subtraction of the supplied color to the color as a new
* color.
* The object itself is not modified!
*
* @name Color#subtract
* @function
* @operator
* @param {Color} color the color to subtract
* @return {Color} the subtraction of the two colors as a new color
*
* @example
* var color1 = new Color(0, 1, 1);
* var color2 = new Color(1, 0, 0);
* var result = color1 - color2;
* console.log(result); // { red: 0, blue: 1, green: 1 }
*/
/**
* Returns the multiplication of the supplied value to both coordinates
* of the color as a new color.
* The object itself is not modified!
*
* @name Color#multiply
* @function
* @operator
* @param {Number} number the number to multiply
* @return {Color} the multiplication of the color and the value as a
* new color
*
* @example
* var color = new Color(0.5, 1, 1);
* var result = color * 0.5;
* console.log(result); // { red: 0.25, blue: 0.5, green: 0.5 }
*/
/**
* Returns the multiplication of the supplied color to the color as a
* new color.
* The object itself is not modified!
*
* @name Color#multiply
* @function
* @operator
* @param {Color} color the color to multiply
* @return {Color} the multiplication of the two colors as a new color
*
* @example
* var color1 = new Color(0, 1, 1);
* var color2 = new Color(0.5, 0, 0.5);
* var result = color1 * color2;
* console.log(result); // { red: 0, blue: 0, green: 0.5 }
*/
/**
* Returns the division of the supplied value to both coordinates of
* the color as a new color.
* The object itself is not modified!
*
* @name Color#divide
* @function
* @operator
* @param {Number} number the number to divide
* @return {Color} the division of the color and the value as a new
* color
*
* @example
* var color = new Color(0.5, 1, 1);
* var result = color / 2;
* console.log(result); // { red: 0.25, blue: 0.5, green: 0.5 }
*/
/**
* Returns the division of the supplied color to the color as a new
* color.
* The object itself is not modified!
*
* @name Color#divide
* @function
* @operator
* @param {Color} color the color to divide
* @return {Color} the division of the two colors as a new color
*
* @example
* var color1 = new Color(0, 1, 1);
* var color2 = new Color(0.5, 0, 0.5);
* var result = color1 / color2;
* console.log(result); // { red: 0, blue: 0, green: 1 }
*/
}
);
})()
);
ref.Color = Color;
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