wisemapping-open-source/web2d/src/main/javascript/peer/svg/PolyLinePeer.js

/*
 *    Copyright [2012] [wisemapping]
 *
 *   Licensed under WiseMapping Public License, Version 1.0 (the "License").
 *   It is basically the Apache License, Version 2.0 (the "License") plus the
 *   "powered by wisemapping" text requirement on every single page;
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the license at
 *
 *       http://www.wisemapping.org/license
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */

web2d.peer.svg.PolyLinePeer = new Class({
    Extends: web2d.peer.svg.ElementPeer,
    initialize : function() {

        var svgElement = window.document.createElementNS(this.svgNamespace, 'polyline');
        this.parent(svgElement);
        this.setFill("none");
        this.breakDistance = 10;
    },

    setFrom : function(x1, y1) {
        this._x1 = x1;
        this._y1 = y1;
        this._updatePath();
    },

    setTo : function(x2, y2) {
        this._x2 = x2;
        this._y2 = y2;
        this._updatePath();
    },

    setStrokeWidth : function(width) {
        this._native.setAttribute('stroke-width', width);
    },

    setColor : function(color) {
        this._native.setAttribute('stroke', color);
    },

    setStyle : function(style) {
        this._style = style;
        this._updatePath();
    },

    getStyle : function() {
        return this._style;
    },

    _updatePath : function() {
        if (this._style == "Curved") {
            this._updateMiddleCurvePath();
        }
        else if (this._style == "Straight") {
            this._updateStraightPath();
        }
        else {
            this._updateCurvePath();
        }
    },

    _updateStraightPath : function() {
        if ($defined(this._x1) && $defined(this._x2) && $defined(this._y1) && $defined(this._y2)) {
            var path = web2d.PolyLine.buildStraightPath(this.breakDistance, this._x1, this._y1, this._x2, this._y2);
            this._native.setAttribute('points', path);
        }
    },

    _updateMiddleCurvePath : function() {
        var x1 = this._x1;
        var y1 = this._y1;
        var x2 = this._x2;
        var y2 = this._y2;
        if ($defined(x1) && $defined(x2) && $defined(y1) && $defined(y2)) {
            var diff = x2 - x1;
            var middlex = (diff / 2) + x1;
            var signx = 1;
            var signy = 1;
            if (diff < 0) {
                signx = -1;
            }
            if (y2 < y1) {
                signy = -1;
            }
            var path = x1 + ", " + y1 + " " + (middlex - 10 * signx) + ", " + y1 + " " + middlex + ", " + (y1 + 10 * signy) + " " + middlex + ", " + (y2 - 10 * signy) + " " + (middlex + 10 * signx) + ", " + y2 + " " + x2 + ", " + y2;
            this._native.setAttribute('points', path);
        }
    },

    _updateCurvePath : function() {
        if ($defined(this._x1) && $defined(this._x2) && $defined(this._y1) && $defined(this._y2)) {
            var path = web2d.PolyLine.buildCurvedPath(this.breakDistance, this._x1, this._y1, this._x2, this._y2);
            this._native.setAttribute('points', path);
        }
    }
});