extend image settings with coordinates and preview

[mandelbrot.git] / xulapp / chrome / mandelbrot / content / image-settings.js

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is KaiRo.at Mandelbrot, XULRunner version.
 *
 * The Initial Developer of the Original Code is
 * Robert Kaiser <kairo@kairo.at>.
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Robert Kaiser <kairo@kairo.at>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

var gColorPalette = [];

function initSettings() {
}

function drawPreview() {
  let canvas = document.getElementById("mbrotPreview");
  let context = canvas.getContext("2d");

  let Cr_min = parseFloat(document.getElementById("Cr_min").value);
  let Cr_max = parseFloat(document.getElementById("Cr_max").value);
  if ((Cr_min < -2) || (Cr_min > 2) ||
      (Cr_max < -2) || (Cr_max > 2) || (Cr_min >= Cr_max)) {
    Cr_min = -2.0; Cr_max = 1.0;
  }

  let Ci_min = parseFloat(document.getElementById("Ci_min").value);
  let Ci_max = parseFloat(document.getElementById("Ci_max").value);
  if ((Ci_min < -2) || (Ci_min > 2) ||
      (Ci_max < -2) || (Ci_max > 2) || (Ci_min >= Ci_max)) {
    Ci_min = -2.0; Ci_max = 1.0;
  }

  let iterMax = gPref.getIntPref("mandelbrot.iteration_max");
  let algorithm = gPref.getCharPref("mandelbrot.use_algorithm");

  context.fillStyle = "rgba(255, 255, 255, 127)";
  context.fillRect(0, 0, canvas.width, canvas.height);

  try {
    var currentPalette = gPref.getCharPref("mandelbrot.color_palette");
  }
  catch(e) {
    var currentPalette = '';
  }
  if (!currentPalette.length) {
    currentPalette = 'kairo';
  }
  gColorPalette = getColorPalette(currentPalette);

  drawLine(0, [Cr_min, Cr_max, Ci_min, Ci_max],
              canvas, context, iterMax, algorithm);
}