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在天极网上发布的各类delphi原码及技巧文档

penStyle:=pssolid;
invalidate;
end;


procedureTSDIAppForm.Dot1Click(Sender:TObject);
begin
PenStyle:=psdot;
invalidate;
end;

procedureTSDIAppForm.Dash1Click(Sender:TObject);
begin
penStyle:=psdash;
invalidate;
end;

procedureTSDIAppForm.DashDot1Click(Sender:TObject);
begin
PenStyle:=psdashdot;
invalidate;
end;

procedureTSDIAppForm.DashDotDot1Click(Sender:TObject);
begin
penStyle:=psdashdotdot;
invalidate;
end;
//////////////////////////////////
procedureTSDIAppForm.RoundRect1Click(Sender:TObject);
begin
detectI:=4;
invalidate;
end;

procedureTSDIAppForm.Rectangle1Click(Sender:TObject);
begin
detectI:=5;
invalidate;
end;

procedureTSDIAppForm.Helloworld1Click(Sender:TObject);
begin
detectI:=0;
str:='helloworld!!';
Invalidate;

end;

procedureTSDIAppForm.Imateacher1Click(Sender:TObject);
begin
detectI:=0;
str:='Iamateacher!!';
Invalidate;
end;

procedureTSDIAppForm.Fonts1Click(Sender:TObject);
begin
iffontdialog1.Executethen
begin
detectI:=0;
formfont:=fontdialog1.font;
invalidate;
end;
end;{设定字体和大小}
</pre>
<fontcolor="#ffffff">　　</font>编译并运行，可以看到画图的效果。
<p><fontcolor="#ffffff">　　</font>（三）图形的拷贝和剪贴
<p><fontcolor="#ffffff">　　</font>通过剪贴板可以完成拷贝和剪贴的功能。Canvas
不直接支持剪贴板，完成Canvas上图画拷贝和张贴关键技巧是通过一个Tbitmap变量，把Canvas
上的图形先复制到Tbitmap上，再把Tbitamp和window的剪贴板连起来，反过来也一样。
<p><fontcolor="#ffffff">　　</font>Delphi通过鉴定Wizard建立的SDI程序中，有关
Edit命令的Click事件定义在ActionList控件中，相关代码如下：
<pre>//拷贝图形到剪贴板
procedureTSDIAppForm.EditCopy1Execute(Sender:TObject);
var
bmp:tbitmap;//设置一个图形变量
begin
bmp:=tbitmap.Create;
bmp.Width:=rect.Right+10;
bmp.Height:=rect.Bottom+10;
bmp.canvas.CopyRect(rect,sdiappform.canvas,rect);
clipboard.Assign(bmp);
bmp.free;
end;
//从剪贴板上复制
procedureTSDIAppForm.EditPaste1Execute(Sender:TObject);
var
bmp:tbitmap;//设置一个图形变量
begin
ifclipboard.HasFormat(CF_BITMAP)then
begin
bmp:=tbitmap.create;
bmp.Assign(clipboard);
sdiappform.Canvas.draw(0,0,bmp);
bmp.free;
end
elseifclipboard.HasFormat(CF_TEXT)then
begin
str:=clipboard.AsText;
detectI:=0;
invalidate;
end;

end;
//剪下图形拷贝到剪贴板
procedureTSDIAppForm.EditCut1Execute(Sender:TObject);
begin
EditCopy1Execute(sender);
withsdiappform.Canvasdo
begin
copymode:=cmwhiteness;
copyRect(rect,sdiappform.Canvas,rect);
CopyMode:=cmSrcCopy;
end;
end;
</pre>
<fontcolor="#ffffff">　　</font>也可以把已有的图形文件直接拷贝在Canvas上，本程
序通过菜单Open命令完成这一操作。
<pre>procedureTSDIAppForm.FileOpen1Execute(Sender:TObject);
var
bmp:Tbitmap;
currentfile:string;
begin
ifOpenDialog.Executethen
begin
currentfile:=OpenDialog.filename;
ifcurrentfile&#60;&#62;''then
try
bmp:=tbitmap.Create;
bmp.LoadFromFile(currentfile);
sdiappform.Canvas.StretchDraw(rect,bmp);
finally
bmp.Free;
end;

end;

end;
</pre>
<fontcolor="#ffffff">　　</font>本程序只是简单的讨论了Canvas绘图功能，离图形软
件包还相差很远，而且打开图形文件显示在Canvas中还有些问题，希望读者中编程高手能帮
我改正。

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