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{$mode objfpc}
{$H+}
uses SysUtils;
type
TVRMLGeometryNode = class
public
function TrianglesCount(ProxyGeometry: TVRMLGeometryNode): Cardinal; virtual;
end;
TNodeCylinder = class(TVRMLGeometryNode)
public
end;
TNodeIndexedFaceSet = class(TVRMLGeometryNode)
public
function TrianglesCount(ProxyGeometry: TVRMLGeometryNode): Cardinal; override;
end;
function TVRMLGeometryNode.TrianglesCount(ProxyGeometry: TVRMLGeometryNode): Cardinal;
begin
Writeln(ClassName, ': Default TrianglesCount implementation, passes the call to the Proxy or must be overridden');
if ProxyGeometry <> nil then
Result := ProxyGeometry.TrianglesCount(nil) else
raise Exception.CreateFmt('%s: TrianglesCount not overridden, and node without a Proxy', [ClassName]);
end;
function TNodeIndexedFaceSet.TrianglesCount(ProxyGeometry: TVRMLGeometryNode): Cardinal;
begin
Result := 2;
end;
var
C: TNodeCylinder;
I: TNodeIndexedFaceSet;
begin
C := TNodeCylinder.Create;
I := TNodeIndexedFaceSet.Create;
try
Writeln(C.TrianglesCount(I));
finally
FreeAndNil(C);
FreeAndNil(I);
end;
end.
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