//声明:
CreatePen(
Style, Width: Integer; {样式与笔宽}
Color: COLORREF {颜色}
): HPEN; {返回笔句柄}
//Style 参数可选值:
PS_SOLID = 0; {实线}
PS_DASH = 1; {段线; 要求笔宽<=1}
PS_DOT = 2; {点线; 要求笔宽<=1}
PS_DASHDOT = 3; {线、点; 要求笔宽<=1}
PS_DASHDOTDOT = 4; {线、点、点; 要求笔宽<=1}
PS_NULL = 5; {不可见}
PS_INSIDEFRAME = 6; {实线; 但笔宽是向里扩展}
//举例:
procedure TForm1.FormPaint(Sender: TObject);
var
PenStyle: Integer; {Pen 样式}
PenHandle: HPEN; {Pen 句柄}
begin
PenStyle := RadioGroup1.ItemIndex;
PenHandle := CreatePen(PenStyle, 1, clRed);
Canvas.Pen.Handle := PenHandle;
Rectangle(Canvas.Handle, 20, 20, 96,160);
DeleteObject(PenHandle);
end;
procedure TForm1.RadioGroup1Click(Sender: TObject);
begin
Self.Refresh;
end;
//效果图:
//测试 PS_SOLID 与 PS_INSIDEFRAME 的区别
procedure TForm1.FormPaint(Sender: TObject);
var
PenHandle: HPEN;
begin
PenHandle := CreatePen(PS_SOLID, 20, clRed);
Canvas.Pen.Handle := PenHandle;
Rectangle(Canvas.Handle, 20, 20, 96,132);
PenHandle := CreatePen(PS_INSIDEFRAME, 20, clRed);
Canvas.Pen.Handle := PenHandle;
Rectangle(Canvas.Handle, 120, 20, 196,132);
PenHandle := CreatePen(PS_SOLID, 1, clRed);
Canvas.Pen.Handle := PenHandle;
Rectangle(Canvas.Handle, 220, 20, 296,132);
DeleteObject(PenHandle);
end;
//效果图:
