Unit: 
SDL_rchart 
Class: 
TContourPlot 
Declaration: 
procedure Ellipse (cx, cy, HorizAxLeng, VertAxLeng: double); 
The method Ellipse renders a filled ellipse. The center of the ellipse is specified by the parameters (cx,cy), the length of the horizontal and vertical half axes is specified by HorizAxLeng and VertAxLeng, respectively. The color of the boundary is determined by the property DataColor; the color of the inner area is specified by the property FillColor. The fill area of the ellipse may either be opaque or transparent, depending on the property TransparentItems. The line width may be adjusted by the property LineWidth.
Hint 1: 
A circle can be drawn by setting HorizAxLeng and VertAxLeng to equal values (= radius of the circle). Please note that the actual appearance depends on the scaling of the chart axes. 
Hint 2: 
You should avoid drawing ellipses on a logarithmic chart, since the elliptical shape is not adjusted to the logarithmic coordinate system. 
Hint 3: 
In the Light Edition the number of chart elements is restricted to 1000 elements. 
