BG and OBJ Rotation Functions


Functions
void	ham_RotBg (u8 bgno, u16 angle, s32 center_x, s32 center_y, FIXED zoom)
	Rotate / Zoom a BG
void	ham_RotBgEx (u8 bgno, u16 angle, s32 center_x, s32 center_y, u16 x_scroll, u16 y_scroll, FIXED zoom_x, FIXED zoom_y)
	Rotate / Zoom a BG (Advanced options available)
void	ham_RotObjDefineSet (u8 rotset, u16 angle, FIXED zoom_x, FIXED zoom_y)
	Set the Values for a Rotation Set for Sprite Rotation

Function Documentation

void ham_RotBg ( u8 bgno,

u16 angle,

s32 center_x,

s32 center_y,

FIXED zoom

)

Rotate / Zoom a BG

Parameters:

bgno The BG number to rotate. Make sure the BG is rotation capable. See ham_InitMapSet() for more information

angle The angle to rotate the BG in degrees (0..359)

center_x The X center of the rotation

center_y The Y center of the rotation

zoom The zoom level (default is 0x100 which is 256, means no zoom)

See also: ham_InitMapSet() ham_RotBgEx()

void ham_RotBgEx ( u8 bgno,

u16 angle,

s32 center_x,

s32 center_y,

u16 x_scroll,

u16 y_scroll,

FIXED zoom_x,

FIXED zoom_y

)

Rotate / Zoom a BG (Advanced options available)

Parameters:

bgno The BG number to rotate. Make sure the BG is rotation capable. See ham_InitMapSet() for more information

angle The angle to rotate the BG in degrees (0..359)

center_x The X center of the rotation

center_y The Y center of the rotation

x_scroll The X scrolling value for the BG

y_scroll The Y scrolling value for the BG

zoom_x The zoom level for the X axis (default is 0x100 which is 256, means no zoom)

zoom_y The zoom level for the Y axis (default is 0x100 which is 256, means no zoom)

See also: ham_InitMapSet() ham_RotBg()

void ham_RotObjDefineSet ( u8 rotset,

u16 angle,

FIXED zoom_x,

FIXED zoom_y

)

Set the Values for a Rotation Set for Sprite Rotation

Parameters:

rotset The Rotation Set you want to modify (0..31)

angle The angle to rotate the BG in degrees (0..359)

zoom_x The zoom level for the X axis (default is 0x100 which is 256, means no zoom)

zoom_y The zoom level for the Y axis (default is 0x100 which is 256, means no zoom)

See also: ham_CreateObj() ham_SetObjRotEnable() ham_SetObjRotSetSelect()

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