//----------------------------------------------------------------------------------------
// Check ok to move
//----------------------------------------------------------------------------------------
void Camera::CheckCamera()
{
if (MoveFBOK()) MoveFB();
if (MoveLROK()) MoveLR();
if (MoveUDOK()) MoveUD();
if (RotateLROK()) RotateLR();
if (LookUDOK()) LookUD();
}
void do_SetRegion(struct work_item *p) {
double new_xstep;
double new_ystep;
new_x_left = p->u.set_region.new_x_left;
new_y_top = p->u.set_region.new_y_top;
new_x_right = p->u.set_region.new_x_right;
new_y_bottom = p->u.set_region.new_y_bottom;
new_xstep = (new_x_right - new_x_left) / canvas_width;
new_ystep = (new_y_bottom - new_y_top) / canvas_width;
if (new_x_left == x_left && new_x_right == x_right) {
if (new_y_top == y_top && new_y_bottom == y_bottom) {
/* No change */
} else if (new_ystep == ystep) {
/* Vertical pan */
/* Note that ystep is negative */
MoveUD(-(new_y_top - y_top) / ystep);
y_top = new_y_top;
y_bottom = new_y_bottom;
} else {
/* Vertical zoom (and possibly pan) */
y_top = new_y_top;
y_bottom = new_y_bottom;
ystep = new_ystep;
Compute(0, canvas_width, x_left,
0, canvas_width, y_top,
(int) canvas_width, pixmap);
}
} else if (new_y_top == y_top && new_y_bottom == y_bottom) {
if (new_x_left == x_left && new_x_right == x_right) {
/* No change */
} else if (new_xstep == xstep) {
/* Horizontal pan */
MoveLR((new_x_right - x_right) / xstep);
x_left = new_x_left;
x_right = new_x_right;
} else {
/* Horizontal zoom (and possibly pan) */
x_left = new_x_left;
x_right = new_x_right;
xstep = new_xstep;
Compute(0, canvas_width, x_left,
0, canvas_width, y_top,
(int) canvas_width, pixmap);
}
} else if (FPEQUAL((x_right - x_left) / (y_top - y_bottom),
(new_x_right - new_x_left) / (new_y_top - new_y_bottom)) &&
((x_right - x_left) / (y_top - y_bottom) >=
(new_x_right - new_x_left) / (new_y_top - new_y_bottom))) {
/* Uniform zoom. */
BuildMask(canvas_width, pixmap, mask);
x_left = new_x_left;
y_top = new_y_top;
x_right = new_x_right;
y_bottom = new_y_bottom;
xstep = new_xstep;
ystep = new_ystep;
Compute(0, canvas_width, x_left,
0, canvas_width, y_top,
(int) canvas_width, pixmap);
} else {
/* General move. */
x_left = new_x_left;
y_top = new_y_top;
x_right = new_x_right;
y_bottom = new_y_bottom;
xstep = new_xstep;
ystep = new_ystep;
Compute(0, canvas_width, x_left,
0, canvas_width, y_top,
(int) canvas_width, pixmap);
}
}
