...
lcEventSetProc( LC_EVENT_LBDOWN, EventProc, 0, 0 );
...
//-----------------------------------------------
void CALLBACK EventProc (HANDLE hEvent)
{
int EventType;
EventType = lcPropGetInt( hEvent, LC_PROP_EVENT_TYPE );
switch( EventType ){
...
case LC_EVENT_LBDOWN:
OnLBDown( hEvent );
break;
...
}
}
// Variant 1
//-----------------------------------------------
void OnLBDown (HANDLE hEvent)
{
HANDLE hLcWnd, hEnt;
BOOL bCtrl;
int Xwin, Ywin;
int Color;
// State of Ctrl key: 1-pressed, 0-released
bCtrl = lcPropGetInt( hEvent, LC_PROP_EVENT_INT4 );
if (bCtrl){
// graphics window handle
hLcWnd = lcPropGetHandle( hEvent, LC_PROP_EVENT_WND );
// cursor coordinates (window coordinate space, pixels)
Xwin = lcPropGetInt( hEvent, LC_PROP_EVENT_INT1 );
Ywin = lcPropGetInt( hEvent, LC_PROP_EVENT_INT2 );
// get entity under cursor
hEnt = lcWndGetEntByPoint( hLcWnd, Xwin, Ywin );
if (hEnt){
// change entity color
Color = lcPropGetInt( hEnt, LC_PROP_ENT_COLOR );
if (Color == RGB(255,0,0)){
lcPropPutInt( hEnt, LC_PROP_ENT_COLOR, RGB(255,255,0) );
}else{
lcPropPutInt( hEnt, LC_PROP_ENT_COLOR, RGB(255,0,0) );
}
lcWndRedraw( hLcWnd );
}
// disable LiteCAD default actions on LBDown event
lcEventReturnCode( 1 );
}
}
// Variant 2
//-----------------------------------------------
void OnLBDown (HANDLE hEvent)
{
HANDLE hLcWnd, hEnt;
BOOL bCtrl;
double X, Y, Delta;
int Color;
// State of Ctrl key: 1-pressed, 0-released
bCtrl = lcPropGetInt( hEvent, LC_PROP_EVENT_INT4 );
if (bCtrl){
// graphics window handle
hLcWnd = lcPropGetHandle( hEvent, LC_PROP_EVENT_WND );
// get size of pickbox square
Delta = lcPropGetFloat( hLcWnd, LC_PROP_WND_PICKBOXSIZE );
// cursor coordinates (drawing coordinate space)
X = lcPropGetFloat( hEvent, LC_PROP_EVENT_FLOAT1 );
Y = lcPropGetFloat( hEvent, LC_PROP_EVENT_FLOAT2 );
// get entity near X, Y
hEnt = lcWndGetEntByPoint2( hLcWnd, X, Y, Delta );
if (hEnt){
// change entity color
Color = lcPropGetInt( hEnt, LC_PROP_ENT_COLOR );
if (Color == RGB(255,0,0)){
lcPropPutInt( hEnt, LC_PROP_ENT_COLOR, RGB(255,255,0) );
}else{
lcPropPutInt( hEnt, LC_PROP_ENT_COLOR, RGB(255,0,0) );
}
lcWndRedraw( hLcWnd );
}
// disable LiteCAD default actions on LBDown event
lcEventReturnCode( 1 );
}
}