[Gmsh] 2D structured mesh - surface with curve lines

[Pei-Ying Hsieh]

Dear GMSH users:

I am trying to mesh a 2D surface (consists of 2 straight lines and 2 
curcular arc) using structred mesh (will be all Quad).  There is no 
problem if all 4 sides (lines) are striaght lines.  But, circular arc 
seems to be a problem.  Is there a way to do this?  Thanks a lot if you 
can take a look at this!

Pei
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lc = 0.2;
Point(4) = {0, 1, 0, lc};
Point(5) = {0, 0, 0, lc};
Point(6) = {-1, 0, 0, lc};
Point(7) = {-2, 0, 0, lc};
Point(8) = {0, 2, 0, lc};
Line (7) = {8, 4};
Line (8) = {6, 7};
Circle (9) = {7, 5, 8};
Circle (10) = {4, 5, 6};
Line Loop(11) = {7, 10, 8, 9};
Plane Surface(12) = {11};
Transfinite Line{7:10} = 6;
Transfinite Surface{12} = {7, 10, 8, 9};
Recombine Surface {12};

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