drawAtomHighlights(debug) {
    let preprocessor = this.preprocessor;
    let opts = preprocessor.opts;
    let graph = preprocessor.graph;
    let rings = preprocessor.rings;
    let svgWrapper = this.svgWrapper;

    for (var i = 0; i < graph.vertices.length; i++) {
      let vertex = graph.vertices[i];
      let atom = vertex.value;

      for (var j = 0; j < preprocessor.highlight_atoms.length; j++) {
        let highlight = preprocessor.highlight_atoms[j];

        if (atom.class === highlight[0]) {
          svgWrapper.drawAtomHighlight(vertex.position.x, vertex.position.y, highlight[1]);
        }
      }
    }
  }
Draw the highlights for atoms to the canvas.

@param {Boolean} debug