uzoom.pas

用DELPHI 和MAPX的基础练习.是学习的好资料

unit UZoom;

interface

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

type
  TFZoom = class(TForm)
    Edit1: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    ComboBox1: TComboBox;
    Button1: TButton;
    Button3: TButton;
    Button2: TButton;
    procedure FormShow(Sender: TObject);
    procedure ComboBox1Change(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  FZoom: TFZoom;

implementation

uses UMap;

{$R *.dfm}

procedure TFZoom.FormShow(Sender: TObject);
var
i:integer;
begin
  i:= Fmap.Map1.MapUnit;
  ComboBox1.ItemIndex:=i;
  Edit1.Text:=FloatToStr(FMap.Map1.Zoom);
end;

procedure TFZoom.ComboBox1Change(Sender: TObject);
begin
Edit1.Clear;
FMap.Map1.MapUnit:=ComboBox1.ItemIndex;
Edit1.Text:=FloatToStr(FMap.Map1.Zoom);
end;

procedure TFZoom.Button3Click(Sender: TObject);
begin
close;
end;

procedure TFZoom.Button1Click(Sender: TObject);
begin
  FMap.Map1.MapUnit:=ComboBox1.ItemIndex;
  try
    FMap.Map1.Zoom:=StrToFloat(Edit1.Text);
  except
    MessageDlg('请输入正确的数字',mtWarning,[mbOK],0);

  end;
  close;
end;

procedure TFZoom.Button2Click(Sender: TObject);
begin
  FMap.Map1.MapUnit:=ComboBox1.ItemIndex;
  try
    FMap.Map1.Zoom:=StrToFloat(Edit1.Text);
  except
    MessageDlg('请输入正确的数字',mtWarning,[mbOK],0);
  end;
end;

end.