利用Delphi中的画布画树

_Q757856333叹

_Q757856333叹

2016-02-19 12:49

今天图老师小编要跟大家分享利用Delphi中的画布画树,精心挑选的过程简单易学,喜欢的朋友一起来学习吧!

       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.TypeNo0 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
    begin
        setselected(x,y);
    end;
  end;

  procedure TFrm_Tree.FormCreate(Sender: TObject);
  begin
    OLst:=TList.Create;
    ToolNO:=0;
    Root:=true;
    SelID:='';
    SearilID:=0;
    clicked:=false;
    with PaintBox1.Canvas do
    begin
      brush.Color:=clWhite;
      FillRect(rect(0,0,PaintBox1.Width,PaintBox1.Height));
    end;
  end;

  procedure TFrm_Tree.Button1Click(Sender: TObject);
  begin
    ToolNO:=1;
  end;

  procedure TFrm_Tree.Button2Click(Sender: TObject);
  begin
    ToolNO:=2;
  end;

  procedure TFrm_Tree.AddObj(id: string; x, y, typeno: integer;
    selected: boolean; Fnode: string;showed:boolean);
  var
    Obj: ^TObj;
  begin
    new(obj);
    obj.ObjId:=id;
    obj.CenterX:=x;
    obj.centery:=y;
    obj.TypeNo:=typeno;
    obj.Selected:=selected;
    obj.FNode:=fnode;
    obj.showed:=showed;
    OLst.Add(obj);
  end;

  function TFrm_Tree.getObj(id: string): TObj;
  var
    i,j:integer;
  begin
    j:=Olst.Count;
    for i:=0 to j-1 do
    begin
      if TObj(OLst.Items[i]^).ObjId=id then
      begin
        Result:=TObj(OLst.Items[i]^);
        Break;
      end;
    end;
  end;

  function TFrm_Tree.getselect: TObj;
  var
    i,j:integer;
  begin
    j:=Olst.Count;
    for i:=0 to j-1 do
    begin
      if TObj(OLst.Items[i]^).Selected then
      begin
        Result:=TObj(OLst.Items[i]^);
        Break;
      end;
    end;
  end;

  function TFrm_Tree.haveselect: boolean;
  var
    i,j:integer;
  begin
    Result:=false;
    j:=Olst.Count;
    for i:=0 to j-1 do
    begin
      if TObj(OLst.Items[i]^).Selected then
      begin
        Result:=true;
        Break;
      end;
    end;
  end;

  procedure TFrm_Tree.DrawFull;
  var
    i,j:integer;
  begin
    //PaintBox1.Canvas.FillRect(rect(0,0,PaintBox1.Width,PaintBox1.Height));
    clearCanvas;
    j:=olst.Count;
    for I:=0 to j-1 do
    begin
      DrawNode(TObj(OLst.Items[i]^).ObjId);
    end;
  end;

  procedure TFrm_Tree.PaintBox1Paint(Sender: TObject);
  begin
  DrawFull;
  end;

  procedure TFrm_Tree.setselected(x, y: integer);
  var
    i,j:integer;
  begin
    j:=olst.Count;
    for I:=0 to j-1 do
    begin
      TObj(OLst.Items[i]^).Selected:=false;
      if (TObj(OLst.Items[i]^).CenterX-10x) and (TObj(OLst.Items[i]^).CenterX+10x)
      and (TObj(OLst.Items[i]^).Centery-10y) and (TObj(OLst.Items[i]^).Centery+10y) then
      begin
        TObj(OLst.Items[i]^).Selected:=true;
        Label1.caption:='selected the node id:'+ TObj(OLst.Items[i]^).objid;
      end;

    end;
    DrawFull;
  end;

(本文来源于图老师网站,更多请访问http://m.tulaoshi.com/bianchengyuyan/)

  procedure TFrm_Tree.Button3Click(Sender: TObject);
  begin
    ToolNO:=3;
  end;

  function TFrm_Tree.setshowsel(x, y: integer):tobj;
  var
    i,j:integer;
  begin
    j:=olst.Count;
    for I:=0 to j-1 do
    begin
      TObj(OLst.Items[i]^).Selected:=false;
      if (TObj(OLst.Items[i]^).CenterX-10x) and (TObj(OLst.Items[i]^).CenterX+10x)
      and (TObj(OLst.Items[i]^).Centery-10y) and (TObj(OLst.Items[i]^).Centery+10y) then
      begin
        TObj(OLst.Items[i]^).showed:=true;
        Label1.caption:='look the node id:'+ TObj(OLst.Items[i]^).objid;
        Result:=TObj(OLst.Items[i]^);
        Break;
      end;
    end;
  end;

  procedure TFrm_Tree.clearshowed;
  var
    i,j:integer;
  begin
    j:=olst.Count;
    for I:=0 to j-1 do
    begin
      TObj(olst.items[i]^).showed:=false;
    end;
  end;

  procedure TFrm_Tree.setfnode(id: string);
  var
    curobj:^tobj;
  begin
    if id'' then
    begin
      //new(curobj);
      curobj:=getPObj(id);
      while curobj^.TypeNo=1 do
      begin
         curobj^.showed := true;
         curobj :=getpobj(curobj^.FNode);
      end;
      curobj^.showed:=true;
      //dispose(curobj);
    end;
  end;

  procedure TFrm_Tree.setcnode(id: string);
  var
    curobj:^tobj;
    i,j:integer;
  begin
    //curobj:=getobj(id);
    j:=olst.count;
    for i:=0 to j-1 do
    begin
      if tobj(olst.Items[i]^).FNode=id then
      begin
        curobj:=getpobj(tobj(olst.Items[i]^).ObjId);
        curobj^.showed:=true;
        setcnode(curobj^.ObjId);
      end;
    end;
  end;

  procedure TFrm_Tree.clearCanvas;
  begin
    //PaintBox1.Canvas
    PaintBox1.Canvas.FillRect(rect(0,0,PaintBox1.Width,PaintBox1.Height));
  end;

(本文来源于图老师网站,更多请访问http://m.tulaoshi.com/bianchengyuyan/)

  procedure TFrm_Tree.Button4Click(Sender: TObject);
  begin
    clicked:=false;
    PaintBox1.Canvas.FillRect(rect(0,0,PaintBox1.Width,PaintBox1.Height));
    OLst.Clear;
    Root:=true;
    SelID:='';
    SearilID:=0;
   { with PaintBox1.Canvas do
      begin
          Pen.Width :=2;
          Pen.Color:=clblack;
          pen.Style :=psclear;
          Brush.Style:=bsSolid;
          Brush.Color:=clwhite;
          Rectangle(0,0,PaintBox1.Width,PaintBox1.Height);
      end;}
  end;

  procedure TFrm_Tree.Button5Click(Sender: TObject);
  var
    i,j: integer;
  begin
    j:=olst.count;
    for i:=0 to j-1 do
    begin
      tobj(olst.Items[i]^).showed:=true;

    end;
    DrawFull;
  end;

(本文来源于图老师网站,更多请访问http://m.tulaoshi.com/bianchengyuyan/)

  function TFrm_Tree.getPObj(id: string): Pointer;
  var
    i,j:integer;
  begin
    Result:=nil;
    j:=Olst.Count;
    for i:=0 to j-1 do
    begin
      if TObj(OLst.Items[i]^).ObjId=id then
      begin
        Result:=OLst.Items[i];
        Break;
      end;
    end;
  end;

  function TFrm_Tree.clickobj(x, y: integer): string;
  var
    i,j:integer;
  begin
    Result:='';
    j:=olst.Count;
    setselected(x,y);
    for I:=0 to j-1 do
    begin
      if (TObj(OLst.Items[i]^).CenterX-10x) and (TObj(OLst.Items[i]^).CenterX+10x)
      and (TObj(OLst.Items[i]^).Centery-10y) and (TObj(OLst.Items[i]^).Centery+10y) then
      begin
        Label1.caption:='click the node id:'+ TObj(OLst.Items[i]^).objid;
        Result:=TObj(OLst.Items[i]^).ObjId;
        Break;
      end;
    end;
  end;

  procedure TFrm_Tree.Button6Click(Sender: TObject);
  begin
    ToolNO:=4;
  end;

  procedure TFrm_Tree.moveobj(dx, dy: integer);
  var
    i,j:integer;
  begin
    j:=olst.Count;
    for I:=0 to j-1 do
    begin
      TObj(OLst.Items[i]^).CenterX:= TObj(OLst.Items[i]^).CenterX+dx;
      TObj(OLst.Items[i]^).Centery:= TObj(OLst.Items[i]^).Centery+dy;
    end;
    //DrawFull;
  end;

  procedure TFrm_Tree.PaintBox1MouseUp(Sender: TObject; Button: TMouseButton;
    Shift: TShiftState; X, Y: Integer);
  begin
    case toolno of
      4:
      begin
        if clicked then
        begin
          endx:=x;
          endy:=y;
          moveobj((endx-beginx),(endy-beginy));
        end;
        clicked:=false;
      end;
      5:
      begin
        clicked:=false;
      end;
    end;
  end;

  procedure TFrm_Tree.PaintBox1MouseMove(Sender: TObject; Shift: TShiftState;
    X, Y: Integer);
  begin
    if (clicked) then
    begin
    case ToolNO of
    4:
    begin
      moveobj((x-beginx),(y-beginy));
      beginx:=x;beginy:=y;
      DrawFull;
    end;
    5:
    begin
      movenode((x-beginx),(y-beginy),getselect.ObjId);
      movelocal((x-beginx),(y-beginy));
      beginx:=x;beginy:=y;
      DrawFull;
    end;
    end;
    end;
  end;

  procedure TFrm_Tree.FADEStream1Click(Sender: TObject);
  var
    selfile :String;
    curid:string;
    curobj:Tobj;
    lstdate:TIniFile32;
    i,j:integer;
  begin
    j:=OLst.Count;
    if SaveDialog1.Execute then
    begin
      selfile := SaveDialog1.FileName;
      lstdate := TIniFile32.Create(selfile+'.dat');
      lstdate.WriteInteger('Title','Num',j);
      for i:=0 to j-1 do
      begin
        curobj:=Tobj(olst.Items[i]^);
        curid:= curobj.ObjId;
        lstdate.WriteString(curid,'ObjID',curobj.ObjId);
        lstdate.WriteInteger(curid,'CenterX',curobj.CenterX);
        lstdate.WriteInteger(curid,'CenterY',curobj.CenterY);
        lstdate.WriteInteger(curid,'TypeNo',curobj.TypeNo);
        lstdate.WriteBool(curid,'Selected',curobj.Selected);
        lstdate.WriteString(curid,'FNode',curobj.FNode);
        lstdate.WriteBool(curid,'Showed',curobj.showed);
      end;
    end;
  end;

  procedure TFrm_Tree.RANDOMRandomselection1Click(Sender: TObject);
  var
    selfile :String;
    //curid:string;
    lstdate:TIniFile32;
    i,j:integer;
  begin
    if OpenDialog1.Execute then
    begin
        selfile:=OpenDialog1.FileName;
        clicked:=false;
        PaintBox1.Canvas.FillRect(rect(0,0,PaintBox1.Width,PaintBox1.Height));
        OLst.Clear;
        Root:=true;
        SelID:='';
        SearilID:=0;
        lstdate:=TIniFile32.Create(selfile);
        j:=lstdate.ReadInteger('Title','Num',0);
        for i:=1 to j do
        begin
          addobj(lstdate.Readstring(inttostr(i),'ObjID',''),lstdate.ReadInteger(inttostr(i),'CenterX',0),lstdate.ReadInteger(inttostr(i),'CenterY',0),lstdate.ReadInteger(inttostr(i),'TypeNo',0),lstdate.ReadBool(inttostr(i),'Selected',true),lstdate.Readstring(inttostr(i),'FNode',''),lstdate.ReadBool(inttostr(i),'Showed',true));
        end;
        SearilID:=j;
        Root:=false;
        DrawFull;
    end;
  end;

  procedure TFrm_Tree.Button7Click(Sender: TObject);
  begin
    ToolNO:=5;
  end;

  procedure TFrm_Tree.movenode(dx, dy: integer;id:string);
  var
    i,j:integer;
    curobj:^tobj;
  begin
    j:=olst.Count;
    for I:=0 to j-1 do
    begin
      if tobj(olst.Items[i]^).FNode=id then
      begin
        curobj:=getpobj(tobj(olst.Items[i]^).ObjId);
        curobj^.CenterX:=curobj^.CenterX+dx;
        curobj^.CenterY:=curobj^.CenterY+dy;
        movenode(dx,dy,curobj^.ObjId);
      end;
    end;
  end;

  procedure TFrm_Tree.movelocal(dx, dy: integer);
  var
    i,j:integer;
    //curobj:tobj;
  begin
    j:=olst.Count;
    for I:=0 to j-1 do
    begin
      if tobj(olst.Items[i]^).Selected then
      begin
         tobj(olst.Items[i]^).CenterX:=tobj(olst.Items[i]^).CenterX+dx;
         tobj(olst.Items[i]^).Centery:=tobj(olst.Items[i]^).Centery+dy;
         Break;
      end;
    end;
  end;
  end.

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