/**
 * Copyright (c) 2011-2014 by Andrew Mustun. All rights reserved.
 * Copyright (c) 2015 by Peter Chiochetti, CC BY
 * 
 * This file is part of the QCAD project.
 *
 * QCAD is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * QCAD is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with QCAD.
 */

include("../MathExamples.js");

/**
 * This action draws an approximation of an Archimedean spiral (center at 0/0).
 */
function ExMathSpiralA(guiAction) {
    MathExamples.call(this, guiAction);
}

ExMathSpiralA.prototype = new MathExamples();

/**
 * Draws a polyline and terminates.
 * Explode to get quarter circle arcs.
 */
ExMathSpiralA.prototype.beginEvent = function() {
    MathExamples.prototype.beginEvent.call(this);

    var document = this.getDocument();
    var di = this.getDocumentInterface();
    var operation = new RAddObjectsOperation(true);

    var rDelta = 0.25; // distance increment
    var aDelta = Math.PI / 2; // angle increment
    var bulge0 = Math.sin(aDelta / 2); // first segment
    var bulgeN = Math.tan(aDelta / 4); // further segments

    var polyline = new RPolylineData();
    polyline.appendVertex(new RVector(0, 0), bulge0);
    for (var a = aDelta, r = rDelta; r <= 5; a += aDelta, r += rDelta) {
        polyline.appendVertex(
            new RVector(Math.cos(a) * r,  Math.sin(a) * r), bulgeN
        );
    }
    operation.addObject(new RPolylineEntity(document, polyline));
    di.applyOperation(operation);

    this.terminate();
};

/**
 * Adds a menu for this action to Examples/Math Examples/Spiral.
 */
ExMathSpiralA.init = function(basePath) {
    var action = new RGuiAction(qsTr("&SpiralA"), RMainWindowQt.getMainWindow());
    action.setRequiresDocument(true);
    action.setScriptFile(basePath + "/ExMathSpiralA.js");
    action.setGroupSortOrder(79700);
    action.setSortOrder(100);
    action.setWidgetNames(["MathExamplesMenu"]);
};