To plot a line between a point [x_i,y_i] and [0,0] simply do this:
ph0p = plot([0,x_i],[0,y_i]);
Then you can decorate the line using the plot-handle ph0p and the set function.
For example from the fifth point in your curve this would become:
ph0p = plot([0,x(i_xy)],[0,y(i_xy)]);