利用Delphi中的画布画树

     一直都听说delphi中画布使用简单方便。现在我就利用画布实现一个简单的树机构的图形表示。系统支持节点选择、移动、保存树、打开树等。为了实现的方便用到了递归与指针，虽然效率有点问题但是在快速解决问题还是蛮好的。

  程序写的比较乱，欢迎交流：sss@pacia.com.cn

  源代码如下：

  unit U_Tree;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ExtCtrls, StdCtrls, jpeg, Menus,IniFiles32;

type
  TObj= record
    ObjId   : string;
    CenterX : integer;
    CenterY : integer;
    TypeNo  : integer;
    Selected : boolean;
    FNode    : string;
    showed  : boolean;
  end;
  TFrm_Tree = class(TForm)
    Panel1: TPanel;
    PaintBox1: TPaintBox;
    Panel2: TPanel;
    Label1: TLabel;
    Button2: TButton;
    Button1: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    MainMenu1: TMainMenu;
    FADEStream1: TMenuItem;
    RANDOMRandomselection1: TMenuItem;
    SaveDialog1: TSaveDialog;
    OpenDialog1: TOpenDialog;
    Button7: TButton;
    procedure PaintBox1MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure PaintBox1Paint(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure PaintBox1MouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure PaintBox1MouseMove(Sender: TObject; Shift: TShiftState; X,
      Y: Integer);
    procedure FADEStream1Click(Sender: TObject);
    procedure RANDOMRandomselection1Click(Sender: TObject);
    procedure Button7Click(Sender: TObject);
  private
    { Private declarations }
    ToolNO : integer;                        //1 画点，2 选择  3 查看  4 移动 5子移动
    beginx,beginy,endx,endy : integer;
    clicked:boolean;
    OLst : TList;
    SelID : string;
    Root : boolean;
    SearilID : integer;
    procedure DrawNode(id:string);
    procedure AddObj(id:string;x,y:integer;typeno:integer;selected:boolean;Fnode:string;showed:boolean);
    function getObj(id : string): TObj;
    function getPObj(id:string): Pointer;
    function getselect: TObj;
    function haveselect:boolean;
    function clickobj(x,y:integer):string;
    procedure DrawFull;
    procedure setselected(x,y:integer);
    function setshowsel(x,y:integer):tobj;
    procedure setfnode(id:string);
    procedure setcnode(id:string);
    procedure clearshowed;
    procedure clearCanvas;
    procedure moveobj(dx,dy:integer);
    procedure movenode(dx,dy:integer;id:string);
    procedure movelocal(dx,dy:integer);
    //procedure
  public
    { Public declarations }
  end;

var
  Frm_Tree: TFrm_Tree;

implementation

{$R *.DFM}

{ TForm1 }

procedure TFrm_Tree.DrawNode(id:string);
var
  OldBrushColor: TColor;
  OldpenColor: TColor;
  obj:TObj;
begin
  obj:=getObj(id);

  with Frm_Tree.PaintBox1.Canvas do
  begin
    if obj.showed then
    begin
      OldBrushColor:=brush.color;
      OldpenColor:=pen.color;
      if obj.Selected then
      begin
        Pen.Color:=rgb(255,0,0);
      end;
      Brush.Color:=$00FF31FF;
      Ellipse(obj.CenterX-10,obj.Centery-10,obj.CenterX+10,obj.Centery+10);
      Pen.Color:=$00FF31FF;
      if obj.TypeNo>0 then
      begin
        moveTo(obj.CenterX,obj.CenterY);
        lineTo(GetObj(obj.FNode).CenterX,GetObj(obj.FNode).CenterY);
      end;
      pen.color:=OldpenColor;
      brush.color:=OldBrushColor;
    end;
  end;
end;

procedure TFrm_Tree.PaintBox1MouseDown(Sender: TObject;
  Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
var
  curobj:Tobj;
begin
  if Button= mbLeft then
  begin
    case ToolNO of
    1:
      begin
        SearilID :=SearilID+1;
        if Root then
        begin
          AddObj(inttostr(SearilID),x,y,0,false,'''''''',true);
          DrawNode(inttostr(SearilID));
          Root:=false;
        end
        else
        begin
          if haveselect then
          begin
            AddObj(inttostr(SearilID),x,y,1,false,getselect.objid,true);
            DrawNode(inttostr(SearilID));
            label1.Caption:=''''add the node,id:''''+inttostr(SearilID);
          end
          else
          begin
            label1.Caption:=''''please select the node!'''';
          end;
        end;
      end;
    2:
      begin
        setselected(x,y);
      end;
    3:                       //查看
      begin
        //clearCanvas;
        curobj:=setshowsel(x,y);
        if curobj.ObjId<>'''''''' then
        begin
          clearshowed;
          curobj:=setshowsel(x,y);
          curobj.showed:=true;
          setfnode(curobj.FNode);
          setcnode(curobj.ObjId);
          DrawFull;
        end;
      end;
    4:             //移动
      begin
        if clickobj(x,y)<>'''''''' then clicked:=true;
        beginx:=x;
        beginy:=y;
      end;
    5:
      begin
        if clickobj(x,y)<>'''''''' then clicked:=true;
        beginx:=x;
        beginy:=y;
      end;
    end;
  end
  else
  beg

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