Correction needed for XFORM in windows.inc

[ToutEnMasm]

The good
XFORM   STRUCT
   eM11 REAL4 ?
   eM12 REAL4 ?
   eM21 REAL4 ?
   eM22 REAL4 ?
   regEdx REAL4 ?
   eDy REAL4 ?

XFORM      ENDS


The windows.inc structure,
XFORM STRUCT
  eM11  DWORD      ?
  eM12  DWORD      ?
  eM21  DWORD      ?
  eM22  DWORD      ?
  ex    DWORD      ?
  ey    DWORD      ?
XFORM ENDS

[zooba]

I think hutch has said before that he prefers to use DWORDs for everything API related. That may be the reason for this difference.

Out of interest, what is XFORM used for?

Cheers,

Zooba :U

[ToutEnMasm]

The XFORM is used for graphic Transformation with the SetWorldTransform API.
Some applies

Drawing graphics with predefined units.
Centering graphics in the application's client area.
Scaling graphics output to half its original size.
Translating graphics output 3/4 of an inch to the right.
Rotating graphics 30 degrees.
Shearing graphics output along the x-axis.
Reflecting graphics output about an imaginary horizontal axis drawn through its midpoint.


To load the structure i do like that but perhaps is there more simple.

Code Select Expand


invoke StrToFloat,SADR("0.8660"),addr ChargeReal
fld real8 ptr ChargeReal
fstp real4 ptr xForm.eM11


                                            ToutEnMasm

Code Select Expand



.elseif case == TRANSLATE   ;Translate right by 3/4 inch.
xForm.eM11 = (FLOAT) 1.0;
xForm.eM12 = (FLOAT) 0.0;
xForm.eM21 = (FLOAT) 0.0;
xForm.eM22 = (FLOAT) 1.0;
xForm.eDx  = (FLOAT) 75.0;
xForm.eDy  = (FLOAT) 0.0;
SetWorldTransform(hDC, &xForm);
break;


[zooba]

Wow. That's cool! I never knew about that. Then again, I don't spend much time playing with GDI (I assume it's GDI).

There are macros out there that will let you simply write the number, rather than convert it from a predefined string. Some will store it as a constant (in .data or .const) and others embed it directly into the code. I'm quite certain that REAL4 is typedef'd to DWORD, though some (Microsoft) debuggers apparently will automatically display a REAL4 as floating point.

A quick example of a macro:

Code Select Expand

movr4 MACRO dest, src
    mov dest, 0BADF00Dh     ; make sure it's using a full DWORD move
    ORG $-4
    REAL4 src               ; now overwrite with our real number
ENDM

You can substitute DWORD for REAL4 and it will still work the same.

Cheers,

Zooba :U

[ToutEnMasm]

Thanks,I was searching for a best method.
                          ToutEnMasm*