| #define RESTORE_CTM 4100 |
| short Control(lpDevice, RESTORE_CTM, NULL, NULL) | |||
| LPPDEVICE lpDevice; |
The RESTORE_CTM escape restores the current, previously saved transformation matrix (CTM). The CTM controls the manner in which coordinates are translated, rotated, and scaled by the device. By using matrixes, you can combine these operations in any order to produce the desired mapping for a particular picture.
lpDevice
Points to a PDEVICE structure specifying the destination device.
The return value is the number of SAVE_CTM escapes without a corresponding RESTORE_CTM escape. The return value is -1 if the escape is unsuccessful.
Applications should not make any assumptions about the initial contents of the CTM.
When a driver transforms a primitive using a transformation matrix modified by the application, it should ignore the clipping rectangle specified by GDI. Applications should specify the desired clipping rectangle using the SET_CLIP_BOX escape.
Drivers supporting this escape must also implement the SET_CLIP_BOX, SAVE_CTM, and TRANSFORM_CTM escapes.