ToEE Isometric Transformation

Hi

I've been researching ToEE's isometric transformation for one week now. This is what I got.

From ViewPort (screen) to Isometric (Ground Map) steps:
0. Starting from default top left origin, X to right, Y to bottom.


1. Apply "Flip X" transformation.


2. Apply "Rotate 45 grad anticlockwise" transformation.


3. Apply "Scale Y 1->0.7055" transformation.

 

Math

Code:

"Apply" means "matrix multiplication".

0. Starting from default top left origin, X to right, Y to bottom.
( (1, 0)
, ( 0, 1) )

1. Apply "Flip X" transformation.
( (-1, 0)
, ( 0, 1) )

2. Apply "Rotate (Z-Axis) 45 grad anticlockwise" transformation.
( ( cos(45), sin(45))
, (-sin(45), cos(45)) )

which is
( ( 0.7071, 0.7071)
, (-0.7071, 0.7071) )

3. Apply "Scale Y 1->0.7055" transformation. (math matrix multiplication)
( (1, 0)
, ( 0, 0.7055) )

Result MatrixT is
( (A: -0.7071, B: 0.7071)
, (P: 0.4989, Q: 0.4989) )

P2.X = P1.X * MatrixT.A + P1.Y * MatrixT.B
P2.Y = P1.X * MatrixT.P + P1.Y * MatrixT.Q

==>
P2.X = P1.X * -0.7071 + P1.Y * 0.7071
P2.Y = P1.X * 0.4989 + P1.Y * 0.4989

Edit:
Fixed float to double transformation.