MATLAB: Draw ellipse in image

ellipse imagefaq

I would like to draw an ellipse (black-filled) in a white canvas given the center coordinates of the ellipse.
For rectangle, I did it this way (need to fill the rectangle) but for ellipse it seems to be more difficult.
width = 300;
objectWidth = 60; 
    canvas = ones(width, width);
    figure, imshow (canvas);
    square = rectangle('Position', [60-objectWidth/2, 40-objectWidth/2,  objectWidth, objectWidth], ...
'EdgeColor', [0.5 0.5 0.2]);
I was thinking of the following formula for the ellipse:
   a = 1/2*sqrt((x2-x1)^2+(y2-y1)^2);
   b = a*sqrt(1-e^2);
   t = linspace(0,2*pi);
   X = a*cos(t);
   Y = b*sin(t);
   w = atan2(y2-y1,x2-x1);
   x = (x1+x2)/2 + X*cos(w) - Y*sin(w);
   y = (y1+y2)/2 + X*sin(w) + Y*cos(w):
   plot(x,y,'y-')
   axis equal
Any hints would be great. Btw. Happy New Year!

Best Answer

See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_an_ellipse.3F
Also see my attached demos.
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