Function getAreaRelativeRect

javascript/atoms/typescript/is-displayed.ts:173–204

(area: HTMLAreaElement)

  }

  function getAreaRelativeRect(area: HTMLAreaElement): Rect {
    var shape = area.shape.toLowerCase();
    var coords = area.coords.split(',').map(function (value) {
      return Number(value.trim());
    });

    if (shape === 'rect' && coords.length === 4) {
      return createRect(coords[0], coords[1], coords[2] - coords[0], coords[3] - coords[1]);
    }

    if (shape === 'circle' && coords.length === 3) {
      return createRect(coords[0] - coords[2], coords[1] - coords[2], coords[2] * 2, coords[2] * 2);
    }

    if (shape === 'poly' && coords.length > 2) {
      var minX = coords[0];
      var minY = coords[1];
      var maxX = minX;
      var maxY = minY;

      for (var index = 2; index + 1 < coords.length; index += 2) {
        minX = Math.min(minX, coords[index]);
        maxX = Math.max(maxX, coords[index]);
        minY = Math.min(minY, coords[index + 1]);
        maxY = Math.max(maxY, coords[index + 1]);
      }

      return createRect(minX, minY, maxX - minX, maxY - minY);
    }

    return createRect(0, 0, 0, 0);
  }

  function findImageUsingMap(mapName: string, doc: Document): Element | null {
    // Use querySelector instead of a full-DOM scan; escape the map name so