TPen的7种Style和16种Mode
转:https://www.cnblogs.com/findumars/p/5003991.html
- //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:
- {Mode: 画笔与背景的颜色混合模式; Delphi 定义了模式枚举 TPenMode, 包含以下模式:}
- pmBlack {总是黑色}
- pmWhite {总是白色}
- pmNop {画笔无效}
- pmNot {背景色取反}
- pmCopy {画笔设置的颜色}
- pmNotCopy {画笔颜色取反}
- pmMergePenNot {画笔颜色与背景颜色的反色的组合}
- pmMaskPenNot {画笔颜色与背景公共色的反色的组合}
- pmMergeNotPen {画笔颜色取反后与背景颜色的组合}
- pmMaskNotPen {画笔的反色与背景的公共色的组合}
- pmMerge {画笔颜色与背景颜色的组合}
- pmNotMerge {pmMerge 的反色}
- pmMask {画笔与背景公共颜色的组合}
- pmNotMask {pmMask 的反色}
- pmXor {画笔颜色与背景颜色的 Xor 组合}
- pmNotXor {pmXor 的反色}
- //颜色模式测试程序:
- var
- i,x,y,w,n: Integer;
- begin
- {先画竖的颜色背景}
- x := 0;
- y := 0;
- w := ClientWidth div 18;
- for i := 0 to 18 do
- begin
- Canvas.Brush.Color := PaletteIndex(i);
- Canvas.FillRect(Rect(x, y, x+w, ClientHeight));
- x := x + w;
- end;
- {再按不同模式依次画 16 条红色的横线}
- x := 0;
- y := 20;
- n := ClientWidth;
- Canvas.Pen.Width := 4;
- Canvas.Pen.Color := clRed;
- for i := 0 to 15 do
- begin
- Canvas.Pen.Mode := TPenMode(i);
- Canvas.MoveTo(x, y);
- Canvas.LineTo(x + n, y);
- y := y + 20;
- end;
- end;
//效果图:
:
http://blog.csdn.net/yanjiaye520/article/details/8315197