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/* *
* (c) 2010-2019 Torstein Honsi
*
* License: www.highcharts.com/license
*/
/**
* A valid color to be parsed and handled by Highcharts. Highcharts internally
* supports hex colors like `#ffffff`, rgb colors like `rgb(255,255,255)` and
* rgba colors like `rgba(255,255,255,1)`. Other colors may be supported by the
* browsers and displayed correctly, but Highcharts is not able to process them
* and apply concepts like opacity and brightening.
*
* @typedef {string} Highcharts.ColorString
*/
'use strict';
import H from './Globals.js';
import './Utilities.js';
var isNumber = H.isNumber,
merge = H.merge,
pInt = H.pInt;
/**
* Handle color operations. The object methods are chainable.
*
* @private
* @class
* @name Highcharts.Color
*
* @param {Highcharts.ColorString} input
* The input color in either rbga or hex format
*/
H.Color = function (input) {
// Backwards compatibility, allow instanciation without new
if (!(this instanceof H.Color)) {
return new H.Color(input);
}
// Initialize
this.init(input);
};
H.Color.prototype = {
// Collection of parsers. This can be extended from the outside by pushing
// parsers to Highcharts.Color.prototype.parsers.
parsers: [{
// RGBA color
regex: /rgba\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]?(?:\.[0-9]+)?)\s*\)/, // eslint-disable-line security/detect-unsafe-regex
parse: function (result) {
return [
pInt(result[1]),
pInt(result[2]),
pInt(result[3]),
parseFloat(result[4], 10)
];
}
}, {
// RGB color
regex:
/rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/,
parse: function (result) {
return [pInt(result[1]), pInt(result[2]), pInt(result[3]), 1];
}
}],
// Collection of named colors. Can be extended from the outside by adding
// colors to Highcharts.Color.prototype.names.
names: {
white: '#ffffff',
black: '#000000'
},
/**
* Parse the input color to rgba array
*
* @private
* @function Highcharts.Color#init
*
* @param {Highcharts.ColorString} input
* The input color in either rbga or hex format
*/
init: function (input) {
var result,
rgba,
i,
parser,
len;
this.input = input = this.names[
input && input.toLowerCase ?
input.toLowerCase() :
''
] || input;
// Gradients
if (input && input.stops) {
this.stops = input.stops.map(function (stop) {
return new H.Color(stop[1]);
});
// Solid colors
} else {
// Bitmasking as input[0] is not working for legacy IE.
if (input && input.charAt && input.charAt() === '#') {
len = input.length;
input = parseInt(input.substr(1), 16);
// Handle long-form, e.g. #AABBCC
if (len === 7) {
rgba = [
(input & 0xFF0000) >> 16,
(input & 0xFF00) >> 8,
(input & 0xFF),
1
];
// Handle short-form, e.g. #ABC
// In short form, the value is assumed to be the same
// for both nibbles for each component. e.g. #ABC = #AABBCC
} else if (len === 4) {
rgba = [
((input & 0xF00) >> 4) | (input & 0xF00) >> 8,
((input & 0xF0) >> 4) | (input & 0xF0),
((input & 0xF) << 4) | (input & 0xF),
1
];
}
}
// Otherwise, check regex parsers
if (!rgba) {
i = this.parsers.length;
while (i-- && !rgba) {
parser = this.parsers[i];
result = parser.regex.exec(input);
if (result) {
rgba = parser.parse(result);
}
}
}
}
this.rgba = rgba || [];
},
/**
* Return the color in the specified format
*
* @function Highcharts.Color#get
*
* @param {string} format
* Possible values are 'a', 'rgb', undefined
*
* @return {Highcharts.ColorString}
* This color as a string.
*/
get: function (format) {
var input = this.input,
rgba = this.rgba,
ret;
if (this.stops) {
ret = merge(input);
ret.stops = [].concat(ret.stops);
this.stops.forEach(function (stop, i) {
ret.stops[i] = [ret.stops[i][0], stop.get(format)];
});
// it's NaN if gradient colors on a column chart
} else if (rgba && isNumber(rgba[0])) {
if (format === 'rgb' || (!format && rgba[3] === 1)) {
ret = 'rgb(' + rgba[0] + ',' + rgba[1] + ',' + rgba[2] + ')';
} else if (format === 'a') {
ret = rgba[3];
} else {
ret = 'rgba(' + rgba.join(',') + ')';
}
} else {
ret = input;
}
return ret;
},
/**
* Brighten the color instance.
*
* @function Highcharts.Color#brighten
*
* @param {number} alpha
* The alpha value.
*
* @return {Highcharts.ColorString}
* This color with modifications.
*/
brighten: function (alpha) {
var i,
rgba = this.rgba;
if (this.stops) {
this.stops.forEach(function (stop) {
stop.brighten(alpha);
});
} else if (isNumber(alpha) && alpha !== 0) {
for (i = 0; i < 3; i++) {
rgba[i] += pInt(alpha * 255);
if (rgba[i] < 0) {
rgba[i] = 0;
}
if (rgba[i] > 255) {
rgba[i] = 255;
}
}
}
return this;
},
/**
* Set the color's opacity to a given alpha value.
*
* @function Highcharts.Color#setOpacity
*
* @param {number} alpha
* Opacity between 0 and 1.
*
* @return {Highcharts.ColorString}
* Color with modifications.
*/
setOpacity: function (alpha) {
this.rgba[3] = alpha;
return this;
},
/**
* Return an intermediate color between two colors.
*
* @function Highcharts.Color#tweenTo
*
* @param {Highcharts.Color} to
* The color object to tween to.
*
* @param {number} pos
* The intermediate position, where 0 is the from color (current
* color item), and 1 is the `to` color.
*
* @return {Highcharts.ColorString}
* The intermediate color in rgba notation.
*/
tweenTo: function (to, pos) {
// Check for has alpha, because rgba colors perform worse due to lack of
// support in WebKit.
var fromRgba = this.rgba,
toRgba = to.rgba,
hasAlpha,
ret;
// Unsupported color, return to-color (#3920, #7034)
if (!toRgba.length || !fromRgba || !fromRgba.length) {
ret = to.input || 'none';
// Interpolate
} else {
hasAlpha = (toRgba[3] !== 1 || fromRgba[3] !== 1);
ret = (hasAlpha ? 'rgba(' : 'rgb(') +
Math.round(toRgba[0] + (fromRgba[0] - toRgba[0]) * (1 - pos)) +
',' +
Math.round(toRgba[1] + (fromRgba[1] - toRgba[1]) * (1 - pos)) +
',' +
Math.round(toRgba[2] + (fromRgba[2] - toRgba[2]) * (1 - pos)) +
(
hasAlpha ?
(
',' +
(toRgba[3] + (fromRgba[3] - toRgba[3]) * (1 - pos))
) :
''
) +
')';
}
return ret;
}
};
/**
* Creates a color instance out of a color string.
*
* @private
* @function Highcharts.color
*
* @param {Highcharts.ColorString} input
* The input color in either rbga or hex format
*/
H.color = function (input) {
return new H.Color(input);
};