void DemoGetHatchEnts (HANDLE hLcWnd)
{
int Key = 123; // required hatch entity is marked with this key value
int NumEnts;
HANDLE hBlock, hEnt, hEntHatch;
BOOL bAssoc;
// get a block, linked with CAD window
hBlock = lcPropGetHandle( hLcWnd, LC_PROP_WND_VIEWBLOCK );
// find required hatch by user-defined key
hEntHatch = lcBlockGetEntByKey( hBlock, Key );
if (hEntHatch){
// check if the hatch is associative
bAssoc = lcPropGetBool( hEntHatch, LC_PROP_HATCH_ASSOC );
if (bAssoc){
// get number of boundary entities
NumEnts = lcPropGetInt( hEntHatch, LC_PROP_HATCH_NENTS );
// get first entity of hatch boundary
hEnt = lcHatchGetEnt( hEntHatch, 0 );
while( hEnt ){
// set red color for the entity
lcPropPutInt( hEnt, LC_PROP_ENT_COLOR, RGB(255,0,0) );
// get next entity of hatch boundary
hEnt = lcHatchGetEnt( hEntHatch, 1 );
}
lcWndRedraw( hLcWnd );
}
}
}