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function target = contour3(this,long,lat,alt,varargin)
%KML.CONTOUR(long,lat,alt) Create a 3D contour of alt in a grid defined by long and lat.
% The altitude of each line is given by its associated contour level
% Similar to built-in contour3 function
%
% Copyright 2012 Rafael Fernandes de Oliveira (rafael@rafael.aero)
% $Revision: 2.3 $ $Date: 2012/09/05 08:00:00 $
target = struct('type','','id','','coordinates_type','','coordinates_id','');
p = inputParser;
nlat = numel(lat);
p.addRequired('lat', @(a)isnumeric(a) && ~isempty(a));
p.addRequired('long', @(a)isnumeric(a) && ~isempty(a) && numel(a)==nlat);
p.addRequired('alt', @(a)isnumeric(a) && ~isempty(a) && numel(a)==nlat);
p.addParamValue('name','kml_contour3',@ischar);
p.addParamValue('id',kml.getTempID('kml_contour3'),@ischar);
p.addParamValue('description','',@ischar);
p.addParamValue('visibility',true,@islogical);
p.addParamValue('extrude',false,@islogical);
p.addParamValue('colorMap','jet',@ischar);
p.addParamValue('numberOfLevels','auto',@(a)(ischar(a) && strcmpi(a,'auto')) ||(isnumeric(a)));
p.addParamValue('altitudeMode','relativeToGround',@(a)ismember(a,{'clampToGround','relativeToGround','absolute'}));
p.addParamValue('noFolder',false,@islogical)
p.addParamValue('showText',false,@islogical)
p.addParamValue('levelStep',1,@isnumeric)
p.addParamValue('labelSpacing',inf,@isnumeric)
p.addParamValue('timeStamp','',@ischar);
p.addParamValue('timeSpanBegin','',@ischar);
p.addParamValue('timeSpanEnd','',@ischar);
p.addParamValue('lineWidth',1,@isnumeric);
p.parse(lat,long,alt,varargin{:});
arg = p.Results;
if arg.noFolder
f = this;
else
f = this.createFolder(arg.name);
end
if isnumeric(arg.numberOfLevels)
c = contours(lat,long,alt,arg.numberOfLevels);
else
c = contours(lat,long,alt);
end
minAlt = min(min(alt));
maxAlt = max(max(alt));
i = 1; k=1;
while true
l = c(1,i);
n = c(2,i);
C(k).lat = c(1,(i+1):(i+n));
C(k).long = c(2,(i+1):(i+n));
C(k).l = l;
i = i + n + 1;
k = k + 1;
if i > size(c,2)
break;
end
end
levels = unique([C(:).l]);
shownLevels = levels(1:arg.levelStep:numel(levels));
ncolors = 100;
cmap = feval(arg.colorMap,ncolors);
levelsCMAP = linspace(min(levels),max(levels),ncolors);
middleLevel = levels(ceil(numel(levels)/2));
for i = 1:numel(C)
clev = C(i).l;
iC = find(levels==clev);
if clev <= middleLevel
clev = clev - 1;
end
if numel(levels) > 1
iC = round(interp1(levelsCMAP,linspace(0,ncolors-1,numel(levelsCMAP)),clev,'linear',0));
else
iC = 1;
end
color = cmap(iC+1 ,:);
colorHex = kml.color2kmlHex(color);
polyColor = colorHex;
if arg.extrude
polyColor(1:2) = 'FF';
colorHex(1:2) = '00';
target(end+1) = f.poly(C(i).long,C(i).lat, 'lineColor', colorHex, ...
'altitudeMode',arg.altitudeMode, ...
'altitude',C(i).l,...
'visibility',arg.visibility, ...
'name',sprintf('Level %g',C(i).l), ...
'timeStamp', arg.timeStamp , ...
'timeSpanBegin', arg.timeSpanBegin , ...
'timeSpanEnd', arg.timeSpanEnd, ...
'extrude',arg.extrude, ...
'polyColor',polyColor, ...
'id',[arg.id '_poly_' num2str(i)] ...
);
else
polyColor(1:2) = '00';
target(end+1) = f.plot(C(i).long,C(i).lat, 'lineColor', colorHex, ...
'lineWidth',arg.lineWidth,...
'altitudeMode',arg.altitudeMode, ...
'altitude',C(i).l,...
'visibility',arg.visibility, ...
'name',sprintf('Level %g',C(i).l), ...
'timeStamp', arg.timeStamp , ...
'timeSpanBegin', arg.timeSpanBegin , ...
'timeSpanEnd', arg.timeSpanEnd, ...
'extrude',arg.extrude, ...
'polyColor',polyColor, ...
'id',[arg.id '_plot_' num2str(i)] ...
);
end
if arg.showText && ismember(C(i).l,shownLevels)
N = numel(C(i).lat);
altTxt = C(i).l;
if ~isfinite(arg.labelSpacing)
R = randi(N,1);
latTxt = interp1(1:N,C(i).lat,R);
longTxt = interp1(1:N,C(i).long,R);
target(end+1) = f.text(longTxt,latTxt,altTxt,sprintf('%g',C(i).l), 'id',[arg.id '_text_' num2str(i)]);
else
dist = kml.ll2dist(C(i).long(1:end-1),C(i).lat(1:end-1), ...
C(i).long(2:end),C(i).lat(2:end));
dist = [0 cumsum(dist)];
for d = 1:arg.labelSpacing:dist(end);
latTxt = interp1(dist,C(i).lat,d);
longTxt = interp1(dist,C(i).long,d);
target(end+1) = f.text(longTxt,latTxt,altTxt,sprintf('%g',C(i).l), 'id',[arg.id '_text_' num2str(i) '_' num2str(d)]);
end
end
end
end
target(1) = []; %remove the empty initial field
end