Area for contour plot - object oriented

I am looking for a way to calculate the area of a contour plot, which uses an object oriented function. I have a table of objects of which I am importing a section of the values to create the contour plot and I am succesfully plotting the graph, so I know this section of the code works. I am sure it is a simple solution but all examples I can find refer to [X Y] = contour(A,B,C) system and I am unsure of how to translate.

Help would be appreciated.

Code:

function obj = contour(obj,ref)
    if ~exist('ref','var'); ref = 1; end
    obj.contourFig = figure();
    obj.contourAx = axes(obj.contourFig);
    [xValues,yValues] = meshgrid(obj.MyObjects(ref).xValues,obj.MyObjects(ref).yValues);
    zMin = 10;
    zInc = 10;
    zMax = obj.MyObjects.maxPower;
    zLevels = zMin:zInc:zMax;
    contour(obj.contourAx,xValues,yValues,obj.MyObjects(ref).powerData,zLevels);   
   
    grid off
    title(obj.MyObjects.filename)
end

[Star Strider]

Please do not name your function contour! This overshadows the contour function.

.

Answer 1

[KSSV]

Read about polyarea. You got (X,Y) coordinates of contour.

[J Ed]

If I add a line which says

a = polyarea(xValues, yValues)

Then I just get back a string filled with 0s?

[KSSV]

You have to check each level and find out is region closed or not.

[J Ed]

I don't understand what that means?