fabric-pure-browser
Version:
Fabric.js package with no node-specific dependencies (node-canvas, jsdom). The project is published once a day (in case if a new version appears) from 'master' branch of https://github.com/fabricjs/fabric.js repository. You can keep original imports in
196 lines (169 loc) • 5.94 kB
JavaScript
(function(global) {
'use strict';
var fabric = global.fabric || (global.fabric = { }),
toFixed = fabric.util.toFixed;
if (fabric.Shadow) {
fabric.warn('fabric.Shadow is already defined.');
return;
}
/**
* Shadow class
* @class fabric.Shadow
* @see {@link http://fabricjs.com/shadows|Shadow demo}
* @see {@link fabric.Shadow#initialize} for constructor definition
*/
fabric.Shadow = fabric.util.createClass(/** @lends fabric.Shadow.prototype */ {
/**
* Shadow color
* @type String
* @default
*/
color: 'rgb(0,0,0)',
/**
* Shadow blur
* @type Number
*/
blur: 0,
/**
* Shadow horizontal offset
* @type Number
* @default
*/
offsetX: 0,
/**
* Shadow vertical offset
* @type Number
* @default
*/
offsetY: 0,
/**
* Whether the shadow should affect stroke operations
* @type Boolean
* @default
*/
affectStroke: false,
/**
* Indicates whether toObject should include default values
* @type Boolean
* @default
*/
includeDefaultValues: true,
/**
* When `false`, the shadow will scale with the object.
* When `true`, the shadow's offsetX, offsetY, and blur will not be affected by the object's scale.
* default to false
* @type Boolean
* @default
*/
nonScaling: false,
/**
* Constructor
* @param {Object|String} [options] Options object with any of color, blur, offsetX, offsetY properties or string (e.g. "rgba(0,0,0,0.2) 2px 2px 10px")
* @return {fabric.Shadow} thisArg
*/
initialize: function(options) {
if (typeof options === 'string') {
options = this._parseShadow(options);
}
for (var prop in options) {
this[prop] = options[prop];
}
this.id = fabric.Object.__uid++;
},
/**
* @private
* @param {String} shadow Shadow value to parse
* @return {Object} Shadow object with color, offsetX, offsetY and blur
*/
_parseShadow: function(shadow) {
var shadowStr = shadow.trim(),
offsetsAndBlur = fabric.Shadow.reOffsetsAndBlur.exec(shadowStr) || [],
color = shadowStr.replace(fabric.Shadow.reOffsetsAndBlur, '') || 'rgb(0,0,0)';
return {
color: color.trim(),
offsetX: parseInt(offsetsAndBlur[1], 10) || 0,
offsetY: parseInt(offsetsAndBlur[2], 10) || 0,
blur: parseInt(offsetsAndBlur[3], 10) || 0
};
},
/**
* Returns a string representation of an instance
* @see http://www.w3.org/TR/css-text-decor-3/#text-shadow
* @return {String} Returns CSS3 text-shadow declaration
*/
toString: function() {
return [this.offsetX, this.offsetY, this.blur, this.color].join('px ');
},
/* _TO_SVG_START_ */
/**
* Returns SVG representation of a shadow
* @param {fabric.Object} object
* @return {String} SVG representation of a shadow
*/
toSVG: function(object) {
var fBoxX = 40, fBoxY = 40, NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS,
offset = fabric.util.rotateVector(
{ x: this.offsetX, y: this.offsetY },
fabric.util.degreesToRadians(-object.angle)),
BLUR_BOX = 20, color = new fabric.Color(this.color);
if (object.width && object.height) {
//http://www.w3.org/TR/SVG/filters.html#FilterEffectsRegion
// we add some extra space to filter box to contain the blur ( 20 )
fBoxX = toFixed((Math.abs(offset.x) + this.blur) / object.width, NUM_FRACTION_DIGITS) * 100 + BLUR_BOX;
fBoxY = toFixed((Math.abs(offset.y) + this.blur) / object.height, NUM_FRACTION_DIGITS) * 100 + BLUR_BOX;
}
if (object.flipX) {
offset.x *= -1;
}
if (object.flipY) {
offset.y *= -1;
}
return (
'<filter id="SVGID_' + this.id + '" y="-' + fBoxY + '%" height="' + (100 + 2 * fBoxY) + '%" ' +
'x="-' + fBoxX + '%" width="' + (100 + 2 * fBoxX) + '%" ' + '>\n' +
'\t<feGaussianBlur in="SourceAlpha" stdDeviation="' +
toFixed(this.blur ? this.blur / 2 : 0, NUM_FRACTION_DIGITS) + '"></feGaussianBlur>\n' +
'\t<feOffset dx="' + toFixed(offset.x, NUM_FRACTION_DIGITS) +
'" dy="' + toFixed(offset.y, NUM_FRACTION_DIGITS) + '" result="oBlur" ></feOffset>\n' +
'\t<feFlood flood-color="' + color.toRgb() + '" flood-opacity="' + color.getAlpha() + '"/>\n' +
'\t<feComposite in2="oBlur" operator="in" />\n' +
'\t<feMerge>\n' +
'\t\t<feMergeNode></feMergeNode>\n' +
'\t\t<feMergeNode in="SourceGraphic"></feMergeNode>\n' +
'\t</feMerge>\n' +
'</filter>\n');
},
/* _TO_SVG_END_ */
/**
* Returns object representation of a shadow
* @return {Object} Object representation of a shadow instance
*/
toObject: function() {
if (this.includeDefaultValues) {
return {
color: this.color,
blur: this.blur,
offsetX: this.offsetX,
offsetY: this.offsetY,
affectStroke: this.affectStroke,
nonScaling: this.nonScaling
};
}
var obj = { }, proto = fabric.Shadow.prototype;
['color', 'blur', 'offsetX', 'offsetY', 'affectStroke', 'nonScaling'].forEach(function(prop) {
if (this[prop] !== proto[prop]) {
obj[prop] = this[prop];
}
}, this);
return obj;
}
});
/**
* Regex matching shadow offsetX, offsetY and blur (ex: "2px 2px 10px rgba(0,0,0,0.2)", "rgb(0,255,0) 2px 2px")
* @static
* @field
* @memberOf fabric.Shadow
*/
// eslint-disable-next-line max-len
fabric.Shadow.reOffsetsAndBlur = /(?:\s|^)(-?\d+(?:px)?(?:\s?|$))?(-?\d+(?:px)?(?:\s?|$))?(\d+(?:px)?)?(?:\s?|$)(?:$|\s)/;
})(typeof exports !== 'undefined' ? exports : this);