sandparm.pas

模拟2维沙堆效果

unit SandParm;
// The dialog box shown on each simulation start-up

interface

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

type
  TParameterForm = class(TForm)
    OkButton: TButton;
    CancelButton: TButton;
    GroupBox1: TGroupBox;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    procedure FormActivate(Sender: TObject);
    procedure OkButtonClick(Sender: TObject);
  end;

var
  ParameterForm: TParameterForm;

implementation

uses
  SandMain;

{$R *.DFM}

{------------------- TParameterForm -------------------}

procedure TParameterForm.FormActivate(Sender: TObject);
begin
  // Get parameters for simulation
  Edit1.Text := IntToStr(MainForm.PileSize);
  Edit2.Text := IntToStr(MainForm.AddRect);
  Edit3.Text := IntToStr(MainForm.MaxRounds);
  Edit1.SetFocus;            // User-friendliness
  Edit1.SelectAll;
end;


procedure TParameterForm.OkButtonClick(Sender: TObject);

  procedure ParameterError(const S: String; EditBox: TEdit);
  begin
    MessageDlg(S, mtError, [mbOk], 0);
    EditBox.SetFocus;
    EditBox.SelectAll;
    ModalResult := mrNone;
  end;

begin
  // Check validity of parameters before closing
  if StrToInt(Edit1.Text) > 255 then
    ParameterError('Pile size cannot exceed 255.', Edit1);
  if StrToInt(Edit2.Text) > StrToInt(Edit1.Text) then
    ParameterError('Diameter must be inside pile size.', Edit2);
end;

end.