Delphi 的绘图功能- TPen类

Delphi 的绘图功能- TPen类

//TPen 的主要属性有四: Color、Width、Style、Mode

{Color: 颜色}

{Width: 宽度; 默认是 1; 如果赋予 <= 0 的值, 会使用默认值}

{Style: 样式; Delphi 定义了笔样式枚举 TPenStyle, 包含以下样式:}
psSolid = 0; {实线}
psDash = 1; {段线; 要求笔宽<=1}
psDot = 2; {点线; 要求笔宽<=1}
psDashDot = 3; {线、点; 要求笔宽<=1}
psDashDotDot = 4; {线、点、点; 要求笔宽<=1}
psClear = 5; {不可见}
psInsideFrame = 6; {实线; 但笔宽是向里扩展}
psUserStyle = 7; {自定义, Delphi.Net 支持}
psAlternate = 8; {交替, Delphi.Net 支持}

//下面的例子依次展示了各种样式:
var
  i,x,y,n: Integer;
begin
  x := 10;
  y := 15;
  n := ClientWidth - 2*x;
  Canvas.Pen.Color := clRed;
  for i := 0 to 8 do
  begin
    Canvas.Pen.Style := TPenStyle(i);
    Canvas.MoveTo(x, y);
    Canvas.LineTo(x + n, y);
    y := y + 15;
  end;
end;

//效果图: