Synopsis
Control the specified graphic context.
Format
void MgraControl(GraphContId, ControlType, Value)
| MIL_ID GraphContId; | Graphic context identifier |
| long ControlType; | Control type |
| long ControlValue; | Control value |
Description
This function allows you to set the attributes of a graphic context.
The GraphContId parameter specifies the identifier of the graphic context (MgraAlloc). To control the default graphic context of the current MIL application, set this parameter to M_DEFAULT.
The ControlType and ControlValue parameters specify the graphic features to control and the values needed for the control. These two parameters can be set to one of the following combinations:
| ControlType | Description & ControlValue |
| M_BACKGROUND_MODE | Controls the setting of background color on the drawing surface. M_OPAQUE Fill background with the current background color before drawing text. This is the default value (M_DEFAULT). M_TRANSPARENT Do not change background before drawing text. This creates a transparent background for printed characters. |
| M_COLOR | Sets the foreground color of a specified graphics context. |
| M_BACKCOLOR | Sets the background color of a specified graphics context. |
For M_COLOR and M_BACKCOLOR, if your RGB values are 8 bits, you can draw in true color by using the M_RGB888 macro:
MgraControl(M_DEFAULT, M_COLOR, M_RGB888(red component, green component, blue component)
If your RGB values are 16 or 32 bits, you must call MgraControl for each color component (R,G, and B). Add M_RED, M_GREEN or M_BLUE to M_COLOR or M_BACKCOLOR to specify the component. For example, for a 16-bit RGB color, you would call the following macro for the red color component:
MgraControl(M_DEFAULT, M_COLOR+M_RED, red color component)
Note that if you do not add the color components to M_COLOR and M_BACKCOLOR, you draw in grayscale. Therefore, the following macro can be used to draw in grayscale:
MgraControl(M_COLOR, value)
See also
《MgraControl()函数》上有1条评论
评论已关闭。