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function target = quadoverlay(this,long,lat,varargin)
%KML.quadoverlay(longitude, latitude) Places the image file (specified by the pair
% attribute 'file','image.png') as a ground overlay in the kml file. The corners
% of the image are given by inputs longitude and latitude (which should represent 4 points).
% To make the overlay transparent, change the alpha portion of the color parameter
% to a different hex value - eg.: 50% transparent, use KML.OVERLAY(...,'color','80FFFFFF')
%
% Copyright 2012 Rafael Fernandes de Oliveira (rafael@rafael.aero)
% $Revision: 2.3 $ $Date: 2012/09/05 08:00:00 $
target = struct('type','','id','');
[long,lat] = this.checkUnit(long,lat);
p = inputParser;
p.addRequired('long', @(a)isnumeric(a) && numel(a)==4);
p.addRequired('lat', @(a)isnumeric(a) && numel(a)==4);
p.addParamValue('id',kml.getTempID('kml_overlay'),@ischar);
p.addParamValue('name','kml_overlay',@ischar);
p.addParamValue('description','',@ischar);
p.addParamValue('visibility',true,@islogical);
p.addParamValue('file','',@ischar);
p.addParamValue('viewBoundScale',1,@(a)isnumeric(a) && numel(a)==1);
p.addParamValue('color','FFFFFFFF',@(a)ischar(a) && numel(a)==8);
p.addParamValue('altitude',1,@(a)isnumeric(a) &&~isempty(a) && numel(a)==1);
p.addParamValue('drawOrder',0,@(a)isnumeric(a) &&~isempty(a) && numel(a)==1);
p.addParamValue('altitudeMode','clampToGround',@(a)ismember(a,{'clampToGround','absolute'}));
p.addParamValue('timeStamp','',@ischar);
p.addParamValue('timeSpanBegin','',@ischar);
p.addParamValue('timeSpanEnd','',@ischar);
p.parse(long,lat,varargin{:});
arg = p.Results;
if isempty(arg.file)
error('Missing file parameter')
end
coordinates = sprintf('%0.16g,%0.16g ',[long(:) lat(:)].');
overlay = this.xml.createElement('GroundOverlay');
icon = this.xml.createElement('Icon');
gxLatLonQuad = this.xml.createElement('gx:LatLonQuad');
overlay.setAttribute('id',arg.id);
overlay.appendChild(this.textNode('name',arg.name));
overlay.appendChild(this.textNode('color',arg.color));
overlay.appendChild(this.textNode('visibility',num2str(arg.visibility)));
overlay.appendChild(this.textNode('description',arg.description));
overlay.appendChild(this.textNode('altitude',num2str(arg.altitude)));
overlay.appendChild(this.textNode('altitudeMode',arg.altitudeMode));
overlay.appendChild(this.textNode('drawOrder',num2str(arg.drawOrder)));
if ~isempty(arg.timeStamp)
timeStamp = this.xml.createElement('TimeStamp');
timeStamp.appendChild(this.textNode('when',arg.timeStamp));
overlay.appendChild(timeStamp);
elseif ~isempty(arg.timeSpanBegin) || ~isempty(arg.timeSpanEnd)
timeSpan = this.xml.createElement('TimeSpan');
if ~isempty(arg.timeSpanBegin)
timeSpan.appendChild(this.textNode('begin',arg.timeSpanBegin));
end
if ~isempty(arg.timeSpanEnd)
timeSpan.appendChild(this.textNode('end',arg.timeSpanEnd));
end
overlay.appendChild(timeSpan);
end
gxLatLonQuad.appendChild(this.textNode('coordinates',coordinates));
icon.appendChild(this.textNode('href',arg.file));
icon.appendChild(this.textNode('viewBoundScale',num2str(arg.viewBoundScale)));
overlay.appendChild(gxLatLonQuad);
overlay.appendChild(icon);
this.doc.appendChild(overlay);
target.id = arg.id;
target.type = 'GroundOverlay';
this.addIncludeFile(arg.file);
end