Overview
Group
Quick Info

Windows NT
Yes
Win95
Yes
Win32s
Yes
Import Library
gdi32.lib
Header File
wingdi.h
Unicode
No
Platform Notes
Windows 95: int == 16 bits

GetMapMode

The GetMapMode function retrieves the current mapping mode.

int GetMapMode(

HDC hdc
// handle of device context
);

Parameters

hdc

Identifies the device context.

Return Values

If the function succeeds, the return value specifies the mapping mode.

If the function fails, the return value is zero.

Remarks

The following list describes the various mapping modes:

Value
Description
MM_ANISOTROPIC
Logical units are mapped to arbitrary units with arbitrarily scaled axes. Use the SetWindowExtEx and SetViewportExtEx functions to specify the units, orientation, and scaling that you want.
MM_HIENGLISH
Each logical unit is mapped to 0.001 inch. Positive x is to the right; positive y is up.
MM_HIMETRIC
Each logical unit is mapped to 0.01 millimeter. Positive x is to the right; positive y is up.
MM_ISOTROPIC
Logical units are mapped to arbitrary units with equally scaled axes; that is, one unit along the x-axis is equal to one unit along the y-axis. Use the SetWindowExtEx and SetViewportExtEx functions to specify the units and the orientation of the axes that you want. Graphics device interface makes adjustments as necessary to ensure the x and y units remain the same size (for example, if you set the window extent, the viewport will be adjusted to keep the units isotropic).
MM_LOENGLISH
Each logical unit is mapped to 0.01 inch. Positive x is to the right; positive y is up.
MM_LOMETRIC
Each logical unit is mapped to 0.1 millimeter. Positive x is to the right; positive y is up.
MM_TEXT
Each logical unit is mapped to one device pixel. Positive x is to the right; positive y is down.
MM_TWIPS
Each logical unit is mapped to one twentieth of a printer's point (1/1440 inch, also called a "twip"). Positive x is to the right; positive y is up.

See Also

SetMapMode
, SetWindowExtEx, SetViewportExtEx

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