//
// The graphics engine GLScene
//
unit FmVectorEditor;

(* Editor for a vector *)

interface

{$I Stage.Defines.inc}

uses
  System.Classes,
  System.SysUtils,
  VCL.Forms,
  VCL.ComCtrls,
  VCL.StdCtrls,
  VCL.ToolWin,
  VCL.ExtCtrls,
  VCL.Buttons,
  VCL.Graphics,
  VCL.Controls,

  Stage.VectorGeometry,
  Stage.Utils,
  Stage.VectorTypes;

type
  TGLVectorEditorForm = class(TForm)
    EDx: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    EDy: TEdit;
    EDz: TEdit;
    BBok: TBitBtn;
    BBcancel: TBitBtn;
    IMx: TImage;
    IMy: TImage;
    IMz: TImage;
    SpeedButton1: TSpeedButton;
    SBmX: TSpeedButton;
    SpeedButton3: TSpeedButton;
    SBmY: TSpeedButton;
    SpeedButton5: TSpeedButton;
    SBmZ: TSpeedButton;
    SpeedButton7: TSpeedButton;
    SBUnit: TSpeedButton;
    SpeedButton9: TSpeedButton;
    Bevel1: TBevel;
    SBInvert: TSpeedButton;
    procedure TBxClick(Sender: TObject);
    procedure TByClick(Sender: TObject);
    procedure TBzClick(Sender: TObject);
    procedure TBnullClick(Sender: TObject);
    procedure EDxChange(Sender: TObject);
    procedure EDyChange(Sender: TObject);
    procedure EDzChange(Sender: TObject);
    procedure SBmXClick(Sender: TObject);
    procedure SBmYClick(Sender: TObject);
    procedure SBmZClick(Sender: TObject);
    procedure SBUnitClick(Sender: TObject);
    procedure SpeedButton9Click(Sender: TObject);
    procedure SBInvertClick(Sender: TObject);
  private
    vx, vy, vz: Single;
    procedure TestInput(edit: TEdit; imError: TImage; var dest: Single);
  public
    function Execute(var x, y, z: Single): Boolean;
  end;

function GLVectorEditorForm: TGLVectorEditorForm;
procedure ReleaseVectorEditorForm;

// ------------------------------------------------------------------
implementation
// ------------------------------------------------------------------

{$R *.dfm}

var
  vGLVectorEditorForm: TGLVectorEditorForm;

function GLVectorEditorForm: TGLVectorEditorForm;
begin
  if not Assigned(vGLVectorEditorForm) then
    vGLVectorEditorForm := TGLVectorEditorForm.Create(nil);
  Result := vGLVectorEditorForm;
end;

procedure ReleaseVectorEditorForm;
begin
  if Assigned(vGLVectorEditorForm) then
  begin
    vGLVectorEditorForm.Free;
    vGLVectorEditorForm := nil;
  end;
end;

function TGLVectorEditorForm.Execute(var x, y, z: Single): Boolean;
begin
  // setup dialog fields
  vx := x;
  vy := y;
  vz := z;
  EDx.Text := FloatToStr(vx);
  EDy.Text := FloatToStr(vy);
  EDz.Text := FloatToStr(vz);
  // show the dialog
  Result := (ShowModal = mrOk);
  if Result then
  begin
    x := vx;
    y := vy;
    z := vz;
  end;
end;

procedure TGLVectorEditorForm.TestInput(edit: TEdit; imError: TImage;
  var dest: Single);
begin
  if Visible then
  begin
    try
      dest := StrToFloat(edit.Text);
      imError.Visible := False;
    except
      imError.Visible := True;
    end;
    BBok.Enabled := not(IMx.Visible or IMy.Visible or IMz.Visible);
  end;
end;

procedure TGLVectorEditorForm.TBxClick(Sender: TObject);
begin
  EDx.Text := '1';
  EDy.Text := '0';
  EDz.Text := '0';
end;

procedure TGLVectorEditorForm.TByClick(Sender: TObject);
begin
  EDx.Text := '0';
  EDy.Text := '1';
  EDz.Text := '0';
end;

procedure TGLVectorEditorForm.TBzClick(Sender: TObject);
begin
  EDx.Text := '0';
  EDy.Text := '0';
  EDz.Text := '1';
end;

procedure TGLVectorEditorForm.TBnullClick(Sender: TObject);
begin
  EDx.Text := '0';
  EDy.Text := '0';
  EDz.Text := '0';
end;

procedure TGLVectorEditorForm.EDxChange(Sender: TObject);
begin
  TestInput(EDx, IMx, vx);
end;

procedure TGLVectorEditorForm.EDyChange(Sender: TObject);
begin
  TestInput(EDy, IMy, vy);
end;

procedure TGLVectorEditorForm.EDzChange(Sender: TObject);
begin
  TestInput(EDz, IMz, vz);
end;

procedure TGLVectorEditorForm.SBmXClick(Sender: TObject);
begin
  EDx.Text := '-1';
  EDy.Text := '0';
  EDz.Text := '0';
end;

procedure TGLVectorEditorForm.SBmYClick(Sender: TObject);
begin
  EDx.Text := '0';
  EDy.Text := '-1';
  EDz.Text := '0';
end;

procedure TGLVectorEditorForm.SBmZClick(Sender: TObject);
begin
  EDx.Text := '0';
  EDy.Text := '0';
  EDz.Text := '-1';
end;

procedure TGLVectorEditorForm.SBUnitClick(Sender: TObject);
begin
  EDx.Text := '1';
  EDy.Text := '1';
  EDz.Text := '1';
end;

procedure TGLVectorEditorForm.SpeedButton9Click(Sender: TObject);
var
  v: TAffineVector;
begin
  SetVector(v, StrToFloatDef(EDx.Text, 0),
    StrToFloatDef(EDy.Text, 0), StrToFloatDef(EDz.Text, 0));
  if VectorLength(v) = 0 then
    v := NullVector
  else
    NormalizeVector(v);
  EDx.Text := FloatToStr(v.x);
  EDy.Text := FloatToStr(v.y);
  EDz.Text := FloatToStr(v.z);
end;

procedure TGLVectorEditorForm.SBInvertClick(Sender: TObject);
var
  v: TAffineVector;
begin
  SetVector(v, StrToFloatDef(EDx.Text, 0),
    StrToFloatDef(EDy.Text, 0), StrToFloatDef(EDz.Text, 0));
  NegateVector(v);
  EDx.Text := FloatToStr(v.x);
  EDy.Text := FloatToStr(v.y);
  EDz.Text := FloatToStr(v.z);
end;

// ------------------------------------------------------------------
initialization
// ------------------------------------------------------------------

finalization

ReleaseVectorEditorForm;

end.