A path to flip Y can't show

[GoogleCodeExporter]

What steps will reproduce the problem?
answer:
   Just run following script:
   var paper = Raphael(0,0, 1000,1000);
   var c1 = paper.path("M0, 0L10, 10");
   var c2 = paper.path("M0, 0L10, 10");
   c2.matrix.add(1,0,0,-1,0, 60);
   c2.attr({transform: c2.matrix.toTransformString()});

What is the expected output? What do you see instead?
anser:
Expected: c1 and c2 both should show. c2 is flipped. 
Actual: Only c1 shows. c2 does not show after flip Y.

What version of the product are you using? On what operating system?
Raphaël 2.1.2
OS: Windows 7 & IE11


Please provide any additional information below.

Original issue reported on code.google.com by liqingju...@gmail.com on 18 Nov 2014 at 7:28

Attachments:

• flipY.htm