一个简单的问题：怎样将画的图形如：线段，点、矩形选中呢？(0分)

如题。谢谢解答。能贴点代码吗？我以前没有做过图形方面的

学习.

我有一个小例子。你的EMAIL

zwtexp@21cn.com thanks.

搞定了吗？
是单个选定，还是任意选定一个？

已经发出

谢谢DLwxn.收到了。我先学习一下。以后有分给你补上。[8D]

能把代码给我一份吗?gy@chintcem.net

也给我一份吧！jw_yan@163.com
TKS!

多谢各位及楼上的兄弟..我收到了..感谢~~!

我也要一份的，sozss_szb@21cn.net,请问那里有object pascal的教程吗？

谢谢!给否给我一份.visualboy@vip.citiz.net

从网上搜来的，关于Form自己做一下
unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, Spin;

type
TOperatorType=(otNone,otDrawLine,otSelect);
TAPoint=Array of TPoint;
TLine=Class//Ï߶ÔÏó.
Public
Selected:Boolean;
PointList:TAPoint;//Ï߶ÔÏóµÄµãÁбí.
constructor Create;
end;

TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
SpinEdit1: TSpinEdit;
Button3: TButton;
Button4: TButton;
Button5: TButton;
procedure FormCreate(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure FormPaint(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure FormMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure Button3Click(Sender: TObject);
procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
procedure Button4Click(Sender: TObject);
procedure Button5Click(Sender: TObject);
private
FOperatorType:TOperatorType;
LineList:TList;
FPointList:TAPoint;
procedure ClearLine;
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}
Const
Minimal=5;

////////////////////////////////////////////////////////////////////
//¼ÆËãÁ½µã¼äµÄ¾àÀë¡£
//²ÎÊý£ºx1,x2,y1,y2:Integer£¬ÐèÒª¼ÆËãµÄÁ½¸öµãµÄXºÍY×ø±ê¡£
//·µ»ØÖµÊÇÁ½¸öµãµÄ¾àÀë¡£
////////////////////////////////////////////////////////////////////
function DotDis(x1,x2,y1,y2:Integer)ouble;Overload;
Var X,youble;
//ÐèÒªÏȽ«ÕûÐÎÊý¾Ýת»»³ÉË«¾«¶È¸¡µãÐͲŲ»ÈÝÒ×Òç³ö¡£
begin
x:=(x1-x2)/5000000;
y:=(y1-y2)/5000000;
Result:=(SQRT(SQR(x)+SQR))*5000000;
end;

////////////////////////////////////////////////////////////////////
//¼ÆËãÁ½µã¼äµÄ¾àÀë¡£
//²ÎÊý£ºDot1,Dot2:TPoint£¬ÐèÒª¼ÆËãµÄÁ½¸öµã¡£
//·µ»ØÖµÊÇÁ½¸öµãµÄ¾àÀë¡£
////////////////////////////////////////////////////////////////////
function DotDis(Dot1,Dot2:TPoint)ouble; Overload;
begin
Result:=DotDis(Dot1.x,Dot2.x,Dot1.y,Dot2.y);
end;

////////////////////////////////////////////////////////////////////
//µãµ½Ï߶εľàÀë¡£Èç¹ûµãÓëÖ±ÏߵĴ¹×ã²»ÔÚÏ߶ÎÉÏ£¬ÔòÈ¡µãµ½Ï߶Î×î½üµãµÄ¾àÀë¡£
//²ÎÊý£ºpFrom, pTo:TPoint£¬Ï߶εĶ˵㡣
// pDot£¬µÚÈýµã¡£
//·µ»ØÖµÊǵÚÈýµãÓëÏ߶εľàÀë¡£
////////////////////////////////////////////////////////////////////
function Dot2Line(pFrom, pTo, pDot: Tpoint)ouble;
var
F2T_Dis,D2T_Dis,D2F_Dis,souble;
begin
F2T_Dis:=DotDis(pFrom,pTo);
D2T_Dis:=DotDis(pDot,pTo);
D2F_Dis:=DotDis(pDot,pFrom);
if (D2F_Dis>SQRT(SQR(D2T_Dis)+SQR(F2T_Dis))) then
Result:=D2T_Dis
else if (D2T_Dis>SQRT(SQR(D2F_Dis)+SQR(F2T_Dis))) then
Result:=D2F_Dis
else if (Trunc(D2F_Dis)=Trunc(SQRT(SQR(D2T_Dis)+SQR(F2T_Dis)))) then
Result:=D2T_Dis
else if (Trunc(D2T_Dis)=Trunc(SQRT(SQR(D2F_Dis)+SQR(F2T_Dis)))) then
Result:=D2F_Dis
else if F2T_Dis<0.0001 then
begin
if D2T_Dis>D2F_Dis then
Result:=D2F_Dis
else
Result:=D2T_Dis;
end else
begin
s:=(D2F_Dis+D2T_Dis+F2T_Dis)/2;
Result:=SQRT(ABS(s*(s-D2F_Dis)*(s-D2T_Dis)*(s-F2T_Dis)))*2/F2T_Dis;
end;
end;

////////////////////////////////////////////////////////////////////
//&amp;Aring;&amp;ETH;&amp;para;&amp;Iuml;&amp;micro;&amp;atilde;&amp;Ecirc;&amp;Ccedil;·&amp;ntilde;&amp;Ocirc;&amp;Uacute;&amp;Ograve;&amp;raquo;&amp;cedil;&amp;ouml;&amp;Igrave;&amp;otilde;&amp;Iuml;&amp;szlig;&amp;Eacute;&amp;Iuml;&amp;raquo;ò&amp;Ograve;&amp;raquo;&amp;para;¨&amp;frac34;à&amp;Agrave;&amp;euml;&amp;Auml;&amp;Uacute;&amp;iexcl;&amp;pound;
//&amp;sup2;&amp;Icirc;&amp;Ecirc;&amp;yacute;&amp;pound;&amp;ordm;PointArray:Array of TPoint×é&amp;sup3;&amp;Eacute;&amp;Ccedil;&amp;oslash;&amp;Oacute;ò&amp;micro;&amp;Auml;&amp;micro;&amp;atilde;&amp;Aacute;&amp;ETH;±í&amp;iexcl;&amp;pound;
// Dot&amp;pound;&amp;not;&amp;micro;&amp;Uacute;&amp;Egrave;&amp;yacute;&amp;micro;&amp;atilde;&amp;iexcl;&amp;pound;
// Var Contrastouble&amp;Ouml;&amp;cedil;&amp;para;¨&amp;micro;&amp;Auml;&amp;frac34;à&amp;Agrave;&amp;euml;&amp;pound;&amp;not;&amp;Egrave;&amp;ccedil;&amp;sup1;&amp;ucirc;&amp;micro;&amp;atilde;&amp;Oacute;&amp;euml;&amp;Iuml;&amp;szlig;&amp;micro;&amp;Auml;&amp;frac34;à&amp;Agrave;&amp;euml;&amp;ETH;&amp;iexcl;&amp;Oacute;&amp;Uacute;&amp;Otilde;&amp;acirc;&amp;cedil;&amp;ouml;&amp;Ouml;&amp;micro;&amp;pound;&amp;not;&amp;Ocirc;ò&amp;Oacute;&amp;Atilde;&amp;Otilde;&amp;acirc;&amp;cedil;&amp;ouml;&amp;Ouml;&amp;micro;&amp;Agrave;&amp;acute;·&amp;micro;&amp;raquo;&amp;Oslash;×&amp;icirc;&amp;frac12;ü&amp;micro;&amp;Auml;&amp;frac34;à&amp;Agrave;&amp;euml;&amp;iexcl;&amp;pound;
// Var PointIndex:Integer·&amp;micro;&amp;raquo;&amp;Oslash;&amp;Oacute;&amp;euml;&amp;cedil;&amp;Atilde;&amp;micro;&amp;atilde;×&amp;icirc;&amp;frac12;ü&amp;micro;&amp;Auml;&amp;Iuml;&amp;szlig;&amp;Eacute;&amp;Iuml;&amp;micro;&amp;Auml;&amp;micro;&amp;atilde;&amp;micro;&amp;Auml;&amp;ETH;ò&amp;ordm;&amp;Aring;&amp;iexcl;&amp;pound;
//·&amp;micro;&amp;raquo;&amp;Oslash;&amp;micro;&amp;Uacute;&amp;Egrave;&amp;yacute;&amp;micro;&amp;atilde;&amp;Ecirc;&amp;Ccedil;·&amp;ntilde;&amp;Ocirc;&amp;Uacute;&amp;Iuml;&amp;szlig;&amp;Eacute;&amp;Iuml;&amp;raquo;ò&amp;frac34;à&amp;Iuml;&amp;szlig;&amp;Ograve;&amp;raquo;&amp;para;¨&amp;frac34;à&amp;Agrave;&amp;euml;&amp;iexcl;&amp;pound;
////////////////////////////////////////////////////////////////////
function MyPTInLine(PointArray:TAPoint;Dot:TPoint;Var Contrastouble;Var PointIndex:Integer):Boolean;
Var MaxX,MaxY,MinX,MinY,i,Count:Integer;
dDot2LineValueouble;
Dis1,Dis2ouble;
begin
Result:=False;
Count:=High(PointArray)+1;
PointIndex:=-1;
if Count<=1 then
Exit;
MaxX:=0;
MaxY:=0;
MinX:=MaxInt;
MinY:=MaxInt;
For i:=0 to Count-1 do
begin
if MaxX<PointArray.x then
MaxX:=PointArray.x;
if MaxY<PointArray.y then
MaxY:=PointArray.y;
if MinX>PointArray.x then
MinX:=PointArray.x;
if MinY>PointArray.y then
MinY:=PointArray.y;
end;
if (Dot.x>MaxX+Contrast)
or (Dot.x<MinX-Contrast)
or (Dot.Y>MaxY+Contrast)
or (Dot.Y<MinY-Contrast)
then
Exit;
For i:=0 to Count-2 do
begin
dDot2LineValue:=Dot2Line(PointArray,PointArray[i+1],Dot);
if dDot2LineValue<=Contrast then
begin
Result:=True;
Contrast:=dDot2LineValue;
Dis1:=DotDis(PointArray,Dot);
Dis2:=DotDis(PointArray[i+1],Dot);
if (Dis1<Dis2) and (Dis1<=Minimal) then
PointIndex:=i
else if (Dis2<Dis1) and (Dis2<=Minimal) then
PointIndex:=i+1;
end;
end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
LineList:=TList.Create; //&amp;acute;&amp;acute;&amp;frac12;¨&amp;Aacute;&amp;ETH;±í±&amp;pound;&amp;acute;&amp;aelig;&amp;para;&amp;Ocirc;&amp;Iuml;ó.
FOperatorType:=otNone; //&amp;Ecirc;&amp;Ccedil;·&amp;ntilde;&amp;Ocirc;&amp;Uacute;&amp;raquo;&amp;shy;&amp;Iuml;&amp;szlig;.
end;

procedure TForm1.ClearLine;//&amp;Ccedil;&amp;aring;&amp;sup3;&amp;yacute;&amp;Iuml;&amp;szlig;&amp;para;&amp;Ocirc;&amp;Iuml;ó.
Var i:Integer;
Line:TLine;
begin
For i:=LineList.Count-1 downto 0 do//&amp;Ecirc;&amp;Iacute;·&amp;Aring;&amp;Atilde;&amp;iquest;&amp;Ograve;&amp;raquo;&amp;cedil;&amp;ouml;&amp;para;&amp;Ocirc;&amp;Iuml;ó.
begin
Line:=LineList;
Line.Free;
LineList.Delete(i);
end;
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
ClearLine;//&amp;Iuml;&amp;Egrave;&amp;Ccedil;&amp;aring;&amp;sup3;&amp;yacute;&amp;Iuml;&amp;szlig;&amp;para;&amp;Ocirc;&amp;Iuml;ó.
LineList.Free;//&amp;Ecirc;&amp;Iacute;·&amp;Aring;&amp;Aacute;&amp;ETH;±í.
end;

procedure TForm1.FormPaint(Sender: TObject);
Var i,j:Integer;
Line:TLine;
P:TPoint;
begin
For i:=0 to LineList.Count-1 do
begin
Canvas.Brush.Color:=Color;
Line:=LineList;
Canvas.Polyline(Line.PointList);//&amp;raquo;&amp;shy;&amp;Atilde;&amp;iquest;&amp;Ograve;&amp;raquo;&amp;Igrave;&amp;otilde;&amp;Iuml;&amp;szlig;&amp;para;&amp;Ocirc;&amp;Iuml;ó.
if Line.Selected then
begin
Canvas.Brush.Color:=clRed;
For j:=0 to High(Line.PointList) do
begin
p:=Line.PointList[j];
Canvas.FillRect(Rect(P.X-2,P.Y-2,P.x+2,P.Y+2));
end;
end;
end;
if FOperatorType=otDrawLine then
begin
if High(FPointList)>=1 then
Canvas.Polyline(FPointList);//&amp;Egrave;&amp;ccedil;&amp;sup1;&amp;ucirc;&amp;Otilde;&amp;yacute;&amp;Ocirc;&amp;Uacute;&amp;raquo;&amp;shy;&amp;Iuml;&amp;szlig;,&amp;Ocirc;ò°&amp;Ntilde;&amp;Icirc;&amp;acute;&amp;Iacute;ê&amp;sup3;&amp;Eacute;&amp;micro;&amp;Auml;&amp;Iuml;&amp;szlig;&amp;Ograve;&amp;sup2;&amp;raquo;&amp;shy;&amp;sup3;&amp;ouml;&amp;Agrave;&amp;acute;.
end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
FOperatorType:=otDrawLine;
SetLength(FPointList,0); //&amp;iquest;&amp;ordf;&amp;Ecirc;&amp;frac14;&amp;raquo;&amp;shy;&amp;Iuml;&amp;szlig;&amp;Ccedil;&amp;aring;&amp;sup3;&amp;yacute;&amp;Aacute;&amp;Ugrave;&amp;Ecirc;±&amp;Iuml;&amp;szlig;&amp;micro;&amp;Auml;&amp;micro;&amp;atilde;&amp;Aacute;&amp;ETH;±í.
end;

procedure TForm1.Button2Click(Sender: TObject);
Var Line:TLine;
begin
FOperatorType:=otNone;
if High(FPointList)>=1 then//&amp;Egrave;&amp;ccedil;&amp;sup1;&amp;ucirc;&amp;Ograve;&amp;Ntilde;&amp;frac34;&amp;shy;&amp;Oacute;&amp;ETH;&amp;Aacute;&amp;frac12;&amp;cedil;&amp;ouml;&amp;Ograve;&amp;Ocirc;&amp;Eacute;&amp;Iuml;&amp;micro;&amp;Auml;&amp;micro;&amp;atilde;
begin
Line:=TLine.Create;//&amp;acute;&amp;acute;&amp;frac12;¨&amp;Ograve;&amp;raquo;&amp;cedil;&amp;ouml;&amp;Iuml;&amp;szlig;&amp;para;&amp;Ocirc;&amp;Iuml;ó.
SetLength(Line.PointList,0);//&amp;sup3;&amp;otilde;&amp;Ecirc;&amp;frac14;&amp;raquo;&amp;macr;&amp;Iuml;&amp;szlig;&amp;para;&amp;Ocirc;&amp;Iuml;ó&amp;micro;&amp;Auml;&amp;micro;&amp;atilde;&amp;Aacute;&amp;ETH;±í.
Line.PointList:=Copy(FPointList,0,Sizeof(TPoint)*(High(FPointList)+1));
//&amp;cedil;&amp;acute;&amp;Ouml;&amp;AElig;&amp;micro;±&amp;Ccedil;°&amp;raquo;&amp;shy;&amp;ordm;&amp;Atilde;&amp;micro;&amp;Auml;&amp;Aacute;&amp;Ugrave;&amp;Ecirc;±&amp;micro;&amp;atilde;&amp;Aacute;&amp;ETH;±í.
LineList.Add(Line);//°&amp;Ntilde;&amp;para;&amp;Ocirc;&amp;Iuml;ó&amp;frac14;&amp;Oacute;&amp;Egrave;&amp;euml;&amp;micro;&amp;frac12;&amp;Aacute;&amp;ETH;±í.
Invalidate;//&amp;Ouml;&amp;Oslash;&amp;raquo;&amp;shy;Form
end;
end;

procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
Var Count,i,PoiIDX:Integer;
Line:TLine;
Contrastouble;
begin
if FOperatorType=otDrawLine then//&amp;Egrave;&amp;ccedil;&amp;sup1;&amp;ucirc;&amp;Otilde;&amp;yacute;&amp;Ocirc;&amp;Uacute;&amp;raquo;&amp;shy;&amp;Iuml;&amp;szlig;.
begin
Count:=High(FPointList)+1;
SetLength(FPointList,Count+1);
FPointList[Count]:=Point(x,y);//&amp;Ocirc;&amp;ouml;&amp;frac14;&amp;Oacute;&amp;Ograve;&amp;raquo;&amp;cedil;&amp;ouml;&amp;micro;&amp;atilde;.
Invalidate;
end else if FOperatorType=otSelect then
begin
For i:=0 to LineList.Count-1 do
begin
Line:=LineList;
Contrast:=Minimal;
if MyPTInLine(Line.PointList,Point(x,y),Contrast,PoiIDX) then
begin
Line.Selected:=not Line.Selected;
Invalidate;
Break;
end;
end;
end;
end;

procedure TForm1.Button3Click(Sender: TObject);
Var OldLine,NewLine:TLine;
i,j:Integer;
begin
if (SpinEdit1.Value>0) and (LineList.Count>0) then//&amp;Egrave;&amp;ccedil;&amp;sup1;&amp;ucirc;&amp;ETH;è&amp;Ograve;&amp;ordf;&amp;cedil;&amp;acute;&amp;Ouml;&amp;AElig;&amp;Ecirc;&amp;yacute;&amp;acute;ó&amp;Oacute;&amp;Uacute;0&amp;sup2;&amp;cent;&amp;Ccedil;&amp;Ograve;&amp;Ograve;&amp;Ntilde;&amp;frac34;&amp;shy;&amp;acute;&amp;aelig;&amp;Ocirc;&amp;Uacute;&amp;Ograve;&amp;raquo;&amp;cedil;&amp;ouml;&amp;Ograve;&amp;Ocirc;&amp;Eacute;&amp;Iuml;&amp;micro;&amp;Auml;&amp;Iuml;&amp;szlig;&amp;Igrave;&amp;otilde;.
begin
OldLine:=LineList[LineList.Count-1];//&amp;Egrave;&amp;iexcl;&amp;sup3;&amp;ouml;&amp;frac34;&amp;Eacute;&amp;Iuml;&amp;szlig;&amp;Igrave;&amp;otilde;.
For i:=0 to SpinEdit1.Value-1 do//&amp;cedil;&amp;acute;&amp;Ouml;&amp;AElig;&amp;ETH;è&amp;Ograve;&amp;ordf;&amp;micro;&amp;Auml;·&amp;Yacute;&amp;Ecirc;&amp;yacute;.
begin
NewLine:=TLine.Create;//&amp;acute;&amp;acute;&amp;frac12;¨&amp;ETH;&amp;Acirc;&amp;Iuml;&amp;szlig;&amp;Igrave;&amp;otilde;.
SetLength(NewLine.PointList,0);//&amp;sup3;&amp;otilde;&amp;Ecirc;&amp;frac14;&amp;raquo;&amp;macr;&amp;micro;&amp;atilde;&amp;Aacute;&amp;ETH;±í.
NewLine.PointList:=Copy(OldLine.PointList,0,Sizeof(TPoint)*(High(OldLine.PointList)+1));
//&amp;cedil;&amp;acute;&amp;Ouml;&amp;AElig;&amp;micro;&amp;atilde;&amp;Aacute;&amp;ETH;±í.
For j:=0 to High(NewLine.PointList) do//&amp;para;&amp;Ocirc;&amp;micro;&amp;atilde;&amp;frac12;&amp;oslash;&amp;ETH;&amp;ETH;&amp;Ograve;&amp;AElig;&amp;Icirc;&amp;raquo;.
begin
NewLine.PointList[j].X:=NewLine.PointList[j].X+40*(i+1);
NewLine.PointList[j].y:=NewLine.PointList[j].y+40*(i+1);
end;
LineList.Add(NewLine);//&amp;frac14;&amp;Oacute;&amp;ordm;&amp;Iacute;&amp;micro;&amp;frac12;&amp;Aacute;&amp;ETH;±í.
end;
Invalidate;//&amp;Ouml;&amp;Oslash;&amp;raquo;&amp;shy;.
end;
end;

procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
begin
if (FOperatorType=otDrawLine) and (High(FPointList)>=0) then//&amp;Otilde;&amp;acirc;&amp;Ouml;&amp;Ouml;·&amp;frac12;·¨&amp;frac14;ò&amp;micro;&amp;yen;&amp;sup2;&amp;raquo;&amp;sup1;&amp;yacute;&amp;Ecirc;ó±ê&amp;Ograve;&amp;AElig;&amp;para;&amp;macr;&amp;Ecirc;±&amp;raquo;á&amp;Ocirc;ì&amp;sup3;&amp;Eacute;&amp;Eacute;&amp;Aacute;&amp;para;&amp;macr;.
begin
Invalidate;
Canvas.MoveTo(FPointList[High(FPointList)].x,FPointList[High(FPointList)].y);
Canvas.LineTo(x,y);
end;
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
FOperatorType:=otSelect;
end;

{ TLine }

constructor TLine.Create;
begin
inherited;
Selected:=False;
end;

procedure TForm1.Button5Click(Sender: TObject);
Var i:Integer;
Line:TLine;
bDeleted:Boolean;
begin
bDeleted:=False;
For i:=LineList.Count-1 downto 0 do//&amp;Ecirc;&amp;Iacute;·&amp;Aring;&amp;Atilde;&amp;iquest;&amp;Ograve;&amp;raquo;&amp;cedil;&amp;ouml;&amp;para;&amp;Ocirc;&amp;Iuml;ó.
begin
Line:=LineList;
if Line.Selected then
begin
Line.Free;
LineList.Delete(i);
bDeleted:=True;
end;
end;
if bDeleted then
Invalidate;
end;

end.

能把代码给我一份吗?yangjunkgy_013@163.com

能把代码也给我一份吗？？E_mail;ciscolyf@163.com
谢谢！！！！

能把代码也给我一份吗?ezhuegou1979@sina.com
Thanks