setLogScaleY method
Implementation
void setLogScaleY( double base ){
if( base <= 1.0 ){
_info[_curIndex]._isLogScaleY = false;
} else {
_info[_curIndex]._isLogScaleY = true;
_info[_curIndex]._baseY = base;
_info[_curIndex]._logBaseY = 1.0 / ClipMath.log( base );
}
}