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ModifyWorldTransform function

Applies to: desktop apps only

The ModifyWorldTransform function changes the world transformation for a device context using the specified mode.

Syntax

Copy

BOOL ModifyWorldTransform(
  __in  HDC hdc,
  __in  const XFORM *lpXform,
  __in  DWORD iMode
);

Parameters

hdc [in]

A handle to the device context.

lpXform [in]

A pointer to an XFORM structure used to modify the world transformation for the given device context.

iMode [in]

Specifies how the transformation data modifies the current world transformation. This parameter must be one of the following values.

Value	Meaning
MWT_IDENTITY	Resets the current world transformation by using the identity matrix. If this mode is specified, the XFORM structure pointed to by lpXform is ignored.
MWT_LEFTMULTIPLY	Multiplies the current transformation by the data in the XFORM structure. (The data in the XFORM structure becomes the left multiplicand, and the data for the current transformation becomes the right multiplicand.)
MWT_RIGHTMULTIPLY	Multiplies the current transformation by the data in the XFORM structure. (The data in the XFORM structure becomes the right multiplicand, and the data for the current transformation becomes the left multiplicand.)

Return value

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero.

Remarks

The ModifyWorldTransform function will fail unless graphics mode for the specified device context has been set to GM_ADVANCED by previously calling the SetGraphicsMode function. Likewise, it will not be possible to reset the graphics mode for the device context to the default GM_COMPATIBLE mode, unless world transform has first been reset to the default identity transform by calling SetWorldTransform or ModifyWorldTransform.

Requirements