@cquiroz/aladin-lite/lib/js/HealpixGrid.js

AladinLite module

// Copyright 2015 - UDS/CNRS
// The Aladin Lite program is distributed under the terms
// of the GNU General Public License version 3.
//
// This file is part of Aladin Lite.
//
//    Aladin Lite 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, version 3 of the License.
//
//    Aladin Lite 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.
//
//    The GNU General Public License is available in COPYING file
//    along with Aladin Lite.
//

/******************************************************************************
 * Aladin Lite project
 *
 * File HealpixGrid
 *
 * Author: Thomas Boch[CDS]
 *
 *****************************************************************************/
var HealpixGrid = function () {
  var HealpixGrid = function HealpixGrid() {};

  HealpixGrid.prototype.redraw = function (ctx, cornersXYViewMap, fov, norder) {
    // on dessine les lignes
    ctx.lineWidth = 1;
    ctx.strokeStyle = "rgb(150,150,220)";
    ctx.beginPath();
    var ipix = 0;
    var cornersXYView;

    for (var _k = 0, _len = cornersXYViewMap.length; _k < _len; _k++) {
      cornersXYView = cornersXYViewMap[_k];
      ipix = cornersXYView.ipix; // draw pixel

      ctx.moveTo(cornersXYView[0].vx, cornersXYView[0].vy);
      ctx.lineTo(cornersXYView[1].vx, cornersXYView[1].vy);
      ctx.lineTo(cornersXYView[2].vx, cornersXYView[2].vy); //ctx.lineTo(cornersXYView[3].vx, cornersXYView[3].vy);
      //ctx.strokeText(ipix, (cornersXYView[0].vx + cornersXYView[2].vx)/2, (cornersXYView[0].vy + cornersXYView[2].vy)/2);
    }

    ctx.stroke(); // on dessine les numéros de pixel HEALpix

    ctx.strokeStyle = "#FFDDDD";
    ctx.beginPath();

    for (var k = 0, len = cornersXYViewMap.length; k < len; k++) {
      cornersXYView = cornersXYViewMap[k];
      ipix = cornersXYView.ipix;
      ctx.strokeText(norder + "/" + ipix, (cornersXYView[0].vx + cornersXYView[2].vx) / 2, (cornersXYView[0].vy + cornersXYView[2].vy) / 2);
    }

    ctx.stroke();
  };

  return HealpixGrid;
}();

export default HealpixGrid;