Hi,
The basic Graphics entity
Disk[{x, y}, r, {[Theta]i, [Theta]f}]Disk[{x,y},[Ellipsis],{Subscript[[Theta], 1],Subscript[[Theta], 2]}]
is also expressed as follows: Disk[{x, y}, {rx, ry}, {[Theta]i, [Theta]f}]
What I wish is for the Mathematica development team to upgrade the functionality of Disk by overloading this new version:
Disk[{x, y}, {r, ri, rf}, {[Theta]i, [Theta]f}]
Instead of the above elegant way, I must do the following:
r := Sqrt[x^2 + y^2];
[Theta] := ArcTan[x, y] + Pi;
RegionPlot[ ri < r < rf && [Theta]i < [Theta] < [Theta]f, {x, -rf, rf}, {y, -rf, rf}]
This does not address the theta sign change near the -ve x-axis
Any thoughts, Thanks, JH
