TChart Contour Map not working

[MARTINRODDY]

HI,

I am trying to plot a contour map for a circlcular surface. I have the contour map working great for the square surface but for the round surface the contour map does not look correct. The contour lines are not joining.

I am using the TChart component in Delphi 5. Here is the code (below) that I am using to feed the values into the component.

It is really difficult to explain this with out having a graphical example. This problem is the last bit holding this project up. Thanks for any help that you may have.

Martin.

roundcon.AddXYZ(0,strtofloat(grdPoints.cells[1,38]),-3);
roundcon.AddXYZ(0.77,strtofloat(grdPoints.cells[1,39]),-2.89);
roundcon.AddXYZ(-0.77,strtofloat(grdPoints.cells[1,37]),-2.89);
roundcon.AddXYZ(-1.5,strtofloat(grdPoints.cells[1,36]),-2.5);
roundcon.AddXYZ(-1.5,strtofloat(grdPoints.cells[1,40]),-2.5);

roundcon.AddXYZ(2.1,strtofloat(grdPoints.cells[1,41]),-2.1);
roundcon.AddXYZ(-2.1,strtofloat(grdPoints.cells[1,35]),-2.1);
roundcon.AddXYZ(0,strtofloat(grdPoints.cells[1,18]),-2);
roundcon.AddXYZ(0.76,strtofloat(grdPoints.cells[1,19]),-1.84);
roundcon.AddXYZ(-0.76,strtofloat(grdPoints.cells[1,17]),-1.84);

roundcon.AddXYZ(2.5,strtofloat(grdPoints.cells[1,42]),-1.5);
roundcon.AddXYZ(-2.5,strtofloat(grdPoints.cells[1,34]),-1.5);
roundcon.AddXYZ(1.41,strtofloat(grdPoints.cells[1,20]),-1.41);
roundcon.AddXYZ(-1.41,strtofloat(grdPoints.cells[1,16]),-1.41);
roundcon.AddXYZ(0,strtofloat(grdPoints.cells[1,6]),-1);

roundcon.AddXYZ(2.89,strtofloat(grdPoints.cells[1,43]),-0.77);
roundcon.AddXYZ(-2.89,strtofloat(grdPoints.cells[1,33]),-0.77);
roundcon.AddXYZ(-1.84,strtofloat(grdPoints.cells[1,15]),-0.76);
roundcon.AddXYZ(1.84,strtofloat(grdPoints.cells[1,21]),-0.76);
roundcon.AddXYZ(0.7,strtofloat(grdPoints.cells[1,7]),-0.7);

roundcon.AddXYZ(-0.7,strtofloat(grdPoints.cells[1,5]),-0.7);
roundcon.AddXYZ(-3,strtofloat(grdPoints.cells[1,32]),0);
roundcon.AddXYZ(-2,strtofloat(grdPoints.cells[1,14]),0);
roundcon.AddXYZ(-1,strtofloat(grdPoints.cells[1,4]),0);
roundcon.AddXYZ(0,strtofloat(grdPoints.cells[1,1]),0);

roundcon.AddXYZ(1,strtofloat(grdPoints.cells[1,8]),0);
roundcon.AddXYZ(2,strtofloat(grdPoints.cells[1,22]),0);
roundcon.AddXYZ(3,strtofloat(grdPoints.cells[1,44]),0);
roundcon.AddXYZ(0.7,strtofloat(grdPoints.cells[1,9]),0.7);
roundcon.AddXYZ(-0.7,strtofloat(grdPoints.cells[1,3]),0.7);

roundcon.AddXYZ(-1.84,strtofloat(grdPoints.cells[1,13]),0.76);
roundcon.AddXYZ(1.84,strtofloat(grdPoints.cells[1,23]),0.76);
roundcon.AddXYZ(2.89,strtofloat(grdPoints.cells[1,45]),0.77);
roundcon.AddXYZ(-2.89,strtofloat(grdPoints.cells[1,31]),0.77);
roundcon.AddXYZ(0,strtofloat(grdPoints.cells[1,2]),1);

roundcon.AddXYZ(1.41,strtofloat(grdPoints.cells[1,24]),1.41);
roundcon.AddXYZ(-1.41,strtofloat(grdPoints.cells[1,12]),1.41);
roundcon.AddXYZ(-2.5,strtofloat(grdPoints.cells[1,30]),1.5);
roundcon.AddXYZ(2.5,strtofloat(grdPoints.cells[1,46]),1.5);
roundcon.AddXYZ(0.76,strtofloat(grdPoints.cells[1,25]),1.84);

roundcon.AddXYZ(-0.76,strtofloat(grdPoints.cells[1,11]),1.84);
roundcon.AddXYZ(0,strtofloat(grdPoints.cells[1,10]),2);
roundcon.AddXYZ(2.1,strtofloat(grdPoints.cells[1,47]),2.1);
roundcon.AddXYZ(-2.1,strtofloat(grdPoints.cells[1,29]),2.1);
roundcon.AddXYZ(-1.5,strtofloat(grdPoints.cells[1,28]),2.5);

roundcon.AddXYZ(1.5,strtofloat(grdPoints.cells[1,48]),2.5);
roundcon.AddXYZ(0.77,strtofloat(grdPoints.cells[1,49]),2.89);
roundcon.AddXYZ(-0.77,strtofloat(grdPoints.cells[1,27]),2.89);
roundcon.AddXYZ(0,strtofloat(grdPoints.cells[1,26]),3);