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https://github.com/Hopiu/fabric.js.git
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335 lines
9 KiB
JavaScript
335 lines
9 KiB
JavaScript
(function(global) {
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'use strict';
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var fabric = global.fabric || (global.fabric = { }),
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extend = fabric.util.object.extend,
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coordProps = { x1: 1, x2: 1, y1: 1, y2: 1 },
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supportsLineDash = fabric.StaticCanvas.supports('setLineDash');
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if (fabric.Line) {
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fabric.warn('fabric.Line is already defined');
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return;
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}
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/**
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* Line class
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* @class fabric.Line
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* @extends fabric.Object
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* @see {@link fabric.Line#initialize} for constructor definition
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*/
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fabric.Line = fabric.util.createClass(fabric.Object, /** @lends fabric.Line.prototype */ {
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/**
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* Type of an object
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* @type String
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* @default
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*/
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type: 'line',
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/**
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* x value or first line edge
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* @type Number
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* @default
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*/
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x1: 0,
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/**
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* y value or first line edge
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* @type Number
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* @default
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*/
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y1: 0,
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/**
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* x value or second line edge
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* @type Number
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* @default
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*/
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x2: 0,
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/**
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* y value or second line edge
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* @type Number
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* @default
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*/
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y2: 0,
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/**
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* Constructor
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* @param {Array} [points] Array of points
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* @param {Object} [options] Options object
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* @return {fabric.Line} thisArg
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*/
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initialize: function(points, options) {
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options = options || { };
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if (!points) {
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points = [0, 0, 0, 0];
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}
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this.callSuper('initialize', options);
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this.set('x1', points[0]);
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this.set('y1', points[1]);
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this.set('x2', points[2]);
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this.set('y2', points[3]);
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this._setWidthHeight(options);
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},
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/**
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* @private
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* @param {Object} [options] Options
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*/
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_setWidthHeight: function(options) {
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options || (options = { });
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this.width = Math.abs(this.x2 - this.x1) || 1;
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this.height = Math.abs(this.y2 - this.y1) || 1;
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this.left = 'left' in options
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? options.left
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: this._getLeftToOriginX();
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this.top = 'top' in options
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? options.top
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: this._getTopToOriginY();
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},
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/**
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* @private
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* @param {String} key
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* @param {Any} value
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*/
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_set: function(key, value) {
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this[key] = value;
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if (typeof coordProps[key] !== 'undefined') {
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this._setWidthHeight();
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}
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return this;
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},
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/**
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* @private
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* @return {Number} leftToOriginX Distance from left edge of canvas to originX of Line.
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*/
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_getLeftToOriginX: makeEdgeToOriginGetter(
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{ // property names
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origin: 'originX',
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axis1: 'x1',
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axis2: 'x2',
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dimension: 'width'
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},
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{ // possible values of origin
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nearest: 'left',
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center: 'center',
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farthest: 'right'
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}
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),
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/**
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* @private
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* @return {Number} topToOriginY Distance from top edge of canvas to originY of Line.
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*/
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_getTopToOriginY: makeEdgeToOriginGetter(
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{ // property names
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origin: 'originY',
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axis1: 'y1',
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axis2: 'y2',
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dimension: 'height'
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},
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{ // possible values of origin
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nearest: 'top',
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center: 'center',
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farthest: 'bottom'
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}
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),
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/**
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* @private
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* @param {CanvasRenderingContext2D} ctx Context to render on
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*/
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_render: function(ctx, noTransform) {
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ctx.beginPath();
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if (noTransform) {
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// Line coords are distances from left-top of canvas to origin of line.
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//
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// To render line in a path-group, we need to translate them to
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// distances from center of path-group to center of line.
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var cp = this.getCenterPoint();
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ctx.translate(
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cp.x,
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cp.y
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);
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}
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if (!this.strokeDashArray || this.strokeDashArray && supportsLineDash) {
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// move from center (of virtual box) to its left/top corner
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// we can't assume x1, y1 is top left and x2, y2 is bottom right
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var xMult = this.x1 <= this.x2 ? -1 : 1,
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yMult = this.y1 <= this.y2 ? -1 : 1;
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ctx.moveTo(
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this.width === 1 ? 0 : (xMult * this.width / 2),
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this.height === 1 ? 0 : (yMult * this.height / 2));
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ctx.lineTo(
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this.width === 1 ? 0 : (xMult * -1 * this.width / 2),
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this.height === 1 ? 0 : (yMult * -1 * this.height / 2));
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}
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ctx.lineWidth = this.strokeWidth;
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// TODO: test this
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// make sure setting "fill" changes color of a line
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// (by copying fillStyle to strokeStyle, since line is stroked, not filled)
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var origStrokeStyle = ctx.strokeStyle;
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ctx.strokeStyle = this.stroke || ctx.fillStyle;
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this.stroke && this._renderStroke(ctx);
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ctx.strokeStyle = origStrokeStyle;
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},
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/**
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* @private
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* @param {CanvasRenderingContext2D} ctx Context to render on
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*/
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_renderDashedStroke: function(ctx) {
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var
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xMult = this.x1 <= this.x2 ? -1 : 1,
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yMult = this.y1 <= this.y2 ? -1 : 1,
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x = this.width === 1 ? 0 : xMult * this.width / 2,
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y = this.height === 1 ? 0 : yMult * this.height / 2;
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ctx.beginPath();
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fabric.util.drawDashedLine(ctx, x, y, -x, -y, this.strokeDashArray);
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ctx.closePath();
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},
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/**
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* Returns object representation of an instance
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* @methd toObject
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* @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
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* @return {Object} object representation of an instance
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*/
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toObject: function(propertiesToInclude) {
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return extend(this.callSuper('toObject', propertiesToInclude), {
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x1: this.get('x1'),
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y1: this.get('y1'),
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x2: this.get('x2'),
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y2: this.get('y2')
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});
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},
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/* _TO_SVG_START_ */
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/**
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* Returns SVG representation of an instance
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* @param {Function} [reviver] Method for further parsing of svg representation.
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* @return {String} svg representation of an instance
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*/
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toSVG: function(reviver) {
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var markup = this._createBaseSVGMarkup(),
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x1 = this.x1, x2 = this.x2, y1 = this.y1, y2 = this.y2;
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if (!(this.group && this.group.type === 'path-group')) {
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var xMult = this.x1 <= this.x2 ? -1 : 1,
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yMult = this.y1 <= this.y2 ? -1 : 1;
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x1 = (xMult * this.width / 2);
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y1 = (yMult * this.height / 2);
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x2 = (xMult * -1 * this.width / 2);
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y2 = (yMult * -1 * this.height / 2);
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}
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markup.push(
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'<line ',
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'x1="', x1,
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'" y1="', y1,
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'" x2="', x2,
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'" y2="', y2,
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'" style="', this.getSvgStyles(),
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'" transform="', this.getSvgTransform(),
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this.getSvgTransformMatrix(),
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'"/>\n'
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);
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return reviver ? reviver(markup.join('')) : markup.join('');
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},
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/* _TO_SVG_END_ */
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/**
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* Returns complexity of an instance
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* @return {Number} complexity
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*/
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complexity: function() {
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return 1;
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}
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});
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/* _FROM_SVG_START_ */
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/**
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* List of attribute names to account for when parsing SVG element (used by {@link fabric.Line.fromElement})
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* @static
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* @memberOf fabric.Line
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* @see http://www.w3.org/TR/SVG/shapes.html#LineElement
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*/
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fabric.Line.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('x1 y1 x2 y2'.split(' '));
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/**
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* Returns fabric.Line instance from an SVG element
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* @static
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* @memberOf fabric.Line
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* @param {SVGElement} element Element to parse
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* @param {Object} [options] Options object
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* @return {fabric.Line} instance of fabric.Line
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*/
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fabric.Line.fromElement = function(element, options) {
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var parsedAttributes = fabric.parseAttributes(element, fabric.Line.ATTRIBUTE_NAMES),
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points = [
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parsedAttributes.x1 || 0,
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parsedAttributes.y1 || 0,
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parsedAttributes.x2 || 0,
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parsedAttributes.y2 || 0
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];
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return new fabric.Line(points, extend(parsedAttributes, options));
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};
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/* _FROM_SVG_END_ */
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/**
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* Returns fabric.Line instance from an object representation
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* @static
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* @memberOf fabric.Line
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* @param {Object} object Object to create an instance from
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* @return {fabric.Line} instance of fabric.Line
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*/
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fabric.Line.fromObject = function(object) {
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var points = [object.x1, object.y1, object.x2, object.y2];
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return new fabric.Line(points, object);
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};
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/**
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* Produces a function that calculates distance from canvas edge to Line origin.
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*/
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function makeEdgeToOriginGetter(propertyNames, originValues) {
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var origin = propertyNames.origin,
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axis1 = propertyNames.axis1,
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axis2 = propertyNames.axis2,
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dimension = propertyNames.dimension,
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nearest = originValues.nearest,
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center = originValues.center,
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farthest = originValues.farthest;
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return function() {
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switch (this.get(origin)) {
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case nearest:
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return Math.min(this.get(axis1), this.get(axis2));
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case center:
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return Math.min(this.get(axis1), this.get(axis2)) + (0.5 * this.get(dimension));
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case farthest:
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return Math.max(this.get(axis1), this.get(axis2));
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}
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};
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}
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})(typeof exports !== 'undefined' ? exports : this);
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