add an option for synching proportions and implement it (mostly)

[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
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 * decision by deleting the provisions above and replace them with the notice
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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** END LICENSE BLOCK ***** */

var gColorPalette = [];

function initSettings() {
  recalcCoord('Cr', 'scale');
  recalcCoord('Ci', 'scale');
}

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

  if (document.getElementById("imgWidth").value /
      document.getElementById("imgHeight").value
        < 80 / 50) {
    canvas.height = 50;
    canvas.width = canvas.height *
      document.getElementById("imgWidth").value /
      document.getElementById("imgHeight").value;
  }
  else {
    canvas.width = 80;
    canvas.height = canvas.width *
      document.getElementById("imgHeight").value /
      document.getElementById("imgWidth").value;
  }

  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);
}

function recalcCoord(coord, target) {
  let othercoord = (coord == 'Ci') ? 'Cr' : 'Ci';
  let owndim = (coord == 'Ci') ? 'height' : 'width';
  let otherdim = (coord == 'Ci') ? 'width' : 'height';
  if (target == 'scale') {
    var myscale =
      parseFloat(document.getElementById(coord + '_max').value) -
      parseFloat(document.getElementById(coord + '_min').value);
    document.getElementById(coord + '_scale').value = roundCoord(myscale);
  }
  else if (target == 'max') {
    let mymax =
      parseFloat(document.getElementById(coord + '_min').value) +
      parseFloat(document.getElementById(coord + '_scale').value);
    document.getElementById('mandelbrot.last_image.' + coord + '_max').value = roundCoord(mymax);
    var myscale = document.getElementById(coord + '_scale').value;
  }
  if (document.getElementById('syncProp').checked) {
    let otherscale = myscale *
      document.getElementById('mandelbrot.image.' + otherdim).value /
      document.getElementById('mandelbrot.image.' + owndim).value;
    document.getElementById(othercoord + '_scale').value = roundCoord(otherscale);
    let othermax =
      parseFloat(document.getElementById(othercoord + '_min').value) +
      parseFloat(document.getElementById(othercoord + '_scale').value);
    document.getElementById('mandelbrot.last_image.' + othercoord + '_max').value = roundCoord(othermax);
  }
}

function checkProportions() {
  if (!document.getElementById('syncProp').checked) {
    recalcCoord('Cr', 'scale');
  }
}

function roundCoord(floatval) {
  // We should round to 10 decimals here or so
  return floatval;
}