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6.3 Rotation parameter control

When displaying the rotation scroll screen, be sure to store the rotation parameters to be controlled in the VRAM as a table. The rotary scroll screen reads the rotation parameter table stored in VRAM line by line and displays the screen according to the value. The rotation parameters are as follows:

Table 6.2 Rotation parameters
Rotation parameters Definition
Screen screen start coordinate Xst X coordinate of upper left corner (or left edge *) of screen screen
Yst Y coordinate of upper left corner (or left edge *) of screen screen
Zst Z coordinate of the screen screen
Screen screen vertical coordinate increment △ Xst X coordinate increment for each screen screen coordinate
△ Yst Increment Y coordinate per line of screen screen coordinates
Screen screen horizontal coordinate increment △ X X coordinate increment for each dot of screen screen coordinate
△ Y Increment Y coordinate per dot of screen screen coordinates
Rotation matrix parameter A 3 × 3 rotation matrix
ABC
DEF
GHI
of 6 matrix parameters from A to F
B
C
D
E
F
Viewpoint coordinates Px Viewpoint X coordinates
Py Y coordinate of viewpoint
Pz Z coordinate of viewpoint
Center coordinates Cx X coordinate of center point
Cy Y coordinate of center point
Cz Z coordinate of center point
Translation amount Mx Translation amount in the X direction between the screen and the viewpoint and center point
My Translation amount of screen screen, viewpoint and center point in Y direction
Scale factor kx X scale factor on display screen
ky Scale factor in Y direction of display screen
Coefficient table start address KAst Table start
Address
Coefficient table vertical direction
Address increment
△ KAst Address per line when using coefficient table
Increment
Coefficient table horizontal direction
Address increment
△ KAx Address per dot when using coefficient table
Increment
[Note] * indicates the case of reading line by line.


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