WinAPI: PolyPolyline - 绘制多组线段

//声明:
PolyPolyline(
  DC: HDC;    {设备环境句柄}
  var Points; {点数组}
  var nPoints;{数组, 数组元素是每个组的顶点数}
  p4: Integer {分组数, 也就是 nPoints 的元素数}
): BOOL;


//举例:
procedure TForm1.FormPaint(Sender: TObject);
var
  ps: array[0..9] of TPoint;
  pn: array[0..1] of Integer;
begin
  {组1:}
  ps[0].X := 50;
  ps[0].Y := 50;
  ps[1].X := 100;
  ps[1].Y := 50;
  ps[2].X := 125;
  ps[2].Y := 75;
  ps[3].X := 100;
  ps[3].Y := 100;
  ps[4].X := 50;
  ps[4].Y := 100;
  ps[5].X := 25;
  ps[5].Y := 75;
  {组2:}
  ps[6].X := 200;
  ps[6].Y := 25;
  ps[7].X := 300;
  ps[7].Y := 25;
  ps[8].X := 300;
  ps[8].Y := 125;
  ps[9].X := 200;
  ps[9].Y := 125;

  pn[0] := 6; {组1有6个顶点}
  pn[1] := 4; {组2有4个顶点}

  PolyPolyline(Canvas.Handle, ps, pn, 2);
end;

 
//效果图:

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