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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. VB4-32,5,6
Declare Function SetMapMode Lib "gdi32" Alias "SetMapMode" (ByVal hdc As Long, ByVal nMapMode As Long) As Long |
| Operating Systems Supported |
| Requires Windows NT 3.1 or later; Requires Windows 95 or later |
· hdc
Identifies the device context.
· fnMapMode
Specifies the new mapping mode. It can be any one of the following values:
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. |
If the function succeeds, the return value identifies the previous mapping mode.
If the function fails, the return value is zero. |
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