

#include <nitro/gx/g2.h>
void G2S_SetBG2Affine(
const MtxFx22 * mtx,
int centerX,
int centerY,
int x1,
int y1
);
| mtx | Pointer to the conversion matrix |
| centerX | X-component of the coordinates of the center of rotation |
| centerY | Y-component of the coordinates of the center of rotation |
| x1 | X-component of coordinate before rotation (horizontal offset) |
| y1 | Y-component of coordinate before rotation (vertical offset) |
None.
Sets the sub 2D Engine's BG2 affine transformation.
Use the formula below to find the rotation and scaling centered on the points on the screen (center x and center y).
![]()
Translation specifies in pixels the offset (x1, y1) of the BG screen with the display screen.
Example:
Rotate/scale BG2 screen centered on a point (center x, center y) using the conversion matrix mtx and
translate dx to the x-axis direction and dy to the y-axis direction.
G2S_SetBG2Affine(
mtx,
centerX, centerY,
dx, dy );
2009/07/10 Revised explanation of affine conversion and added an example.
2004/01/19 Initial version.
CONFIDENTIAL