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Overview |
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Group |
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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
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SetMapMode
The SetMapMode function sets the mapping mode of the specified device context. The mapping
mode defines the unit of measure used to transform page-space units into
device-space units, and also defines the orientation of the device's x and y axes.
int SetMapMode(
HDC hdc,
| // handle of device context
| int fnMapMode
| // new mapping mode
| );
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Parameters
hdc
Identifies the device context.
fnMapMode
Specifies the new mapping mode. It can be any one of the following values:
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 (GDI) 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.
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Return Values
If the function succeeds, the return value identifies the previous mapping
mode.
If the function fails, the return value is zero.
Remarks
The MM_TEXT mode allows applications to work in device pixels, whose size
varies from device to device.
The MM_HIENGLISH, MM_HIMETRIC, MM_LOENGLISH, MM_LOMETRIC, and MM_TWIPS modes
are useful for applications drawing in physically meaningful units (such as
inches or millimeters).
The MM_ISOTROPIC mode ensures a 1:1 aspect ratio.
The MM_ANISOTROPIC mode allows the x-coordinates and y-coordinates to be
adjusted independently.
See Also
GetMapMode, SetViewportExtEx, SetViewportOrgEx, SetWindowExtEx, SetWindowOrgEx
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