/**
* Zoom in/out based on center of viewing rectangle!
*
* @param zov : zoom value (value based on current value.)
*/
boolean zoom(float zov) {
zov = _zov * zov;
if (zov < WConstants.ZOOM_MIN_VALUE) zov = WConstants.ZOOM_MIN_VALUE;
if (zov > WConstants.ZOOM_MAX_VALUE) zov = WConstants.ZOOM_MAX_VALUE;
Rect r = _rectA;
r.set(_rar);
WUtil.expand(r, zov);
if (r.width() > _sheet.width()) return false;
else {
_zov = zov;
_ar.set(r);
WUtil.adjust(_ar, _sheet.boundary());
float rw = _ar.width() / 2.0f;
float rh = _ar.height() / 2.0f;
_rar.l = WUtil.roundOff(_ar.l + rw - rw / _zov);
_rar.t = WUtil.roundOff(_ar.t + rh - rh / _zov);
_rar.r = _rar.l + _sw;
_rar.b = _rar.t + _sh;
moveActiveRegionTo(this, _ar.l, _ar.t);
return true;
}
}
void shift(int vx, int vy) {
// TODO : sliding effect is not implemented yet
int absx = (vx > 0) ? vx : -vx;
int absy = (vy > 0) ? vy : -vy;
int ox = _sw / 4;
int oy = _sh / 4;
int dx, dy;
if (0 == vx) {
dx = 0;
dy = (vy > 0) ? oy : -oy;
} else if (0 == vy) {
dy = 0;
dx = (vx > 0) ? ox : -ox;
} else {
if (absy * ox > oy * absx) {
dx = absx * oy / absy;
dx = (vx > 0) ? dx : -dx;
dy = (vy > 0) ? oy : -oy;
} else {
dy = absy * ox / absx;
dy = (vy > 0) ? dy : -dy;
dx = (vx > 0) ? ox : -ox;
}
}
Rect tmpR = _rectA;
tmpR.set(_ar);
tmpR.offset(_c2s(dx), _c2s(dy));
WUtil.adjust(tmpR, _sheet.boundary());
moveActiveRegionTo(this, tmpR.l, tmpR.t);
}
void moveActiveRegion(Object trigger_owner, int dx, int dy) {
Rect tmpR = _rectA;
tmpR.set(_ar);
tmpR.offset(_c2s(dx), _c2s(dy));
WUtil.adjust(tmpR, _sheet.boundary());
moveActiveRegionTo(this, tmpR.l, tmpR.t);
}
private Rect _compensateThickness(Rect r, byte thick) {
WUtil.expand(r, thick, thick);
WUtil.adjust(r, _sheet.boundary());
return r;
}