unit umain;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  Menus, ieview, imageenview, ComCtrls, ExtCtrls, StdCtrls, hyieutils,
  iexBitmaps, hyiedefs, iesettings, iexRulers, iexLayers;

type
  TForm1 = class(TForm)
    ImageEnView1: TImageEnView;
    MainMenu1: TMainMenu;
    FileMenu: TMenuItem;
    miOpen: TMenuItem;
    N1: TMenuItem;
    miExit: TMenuItem;
    StatusBar1: TStatusBar;
    ViewMenu: TMenuItem;
    miCenter: TMenuItem;
    miAlignRuler: TMenuItem;
    UnitsMenu: TMenuItem;
    miPixels: TMenuItem;
    miInches: TMenuItem;
    miCentimeters: TMenuItem;
    N2: TMenuItem;
    miLockGrips: TMenuItem;
    miMillimeters: TMenuItem;
    ToolsMenu: TMenuItem;
    miAddGrips: TMenuItem;
    miNextKind: TMenuItem;
    N3: TMenuItem;
    miInverted: TMenuItem;
    procedure Exit1Click(Sender: TObject);
    procedure miOpenClick(Sender: TObject);
    procedure ImageEnView1ViewChange(Sender: TObject; Change: Integer);
    procedure Center1Click(Sender: TObject);
    procedure OnSelectUnits(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure miAddGripsClick(Sender: TObject);
    procedure miAlignRulerClick(Sender: TObject);
    procedure miInvertedClick(Sender: TObject);
    procedure miLockGripsClick(Sender: TObject);
    procedure miNextKindClick(Sender: TObject);
    procedure ViewMenuClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}
{$R WindowsTheme.res}


procedure TForm1.FormCreate(Sender: TObject);
begin
  ImageEnView1.RulerParams.Units := ieruPixels;
  ImageEnView1.ShowRulers := [ rdHorizontal, rdVertical ];
  ImageEnView1.RulerParams.ConstrainGrips := True; // Allow grips outside the area of the image?
end;


// File | Exit
procedure TForm1.Exit1Click(Sender: TObject);
begin
  Close;
end;

// File | Open
procedure TForm1.miOpenClick(Sender: TObject);
begin
  with ImageEnView1.IO do
    LoadFromFile( ExecuteOpenDialog('','',false,1,'') );
end;

// scroll or zoom
procedure TForm1.ImageEnView1ViewChange(Sender: TObject; Change: Integer);
begin
  StatusBar1.Panels[0].Text := '  Zoom: ' + IntToStr( Trunc( ImageEnView1.Zoom )) + '%';
end;


// View -> Center
procedure TForm1.Center1Click(Sender: TObject);
begin
  ImageEnView1.Center := miCenter.Checked;
end;

procedure TForm1.miAddGripsClick(Sender: TObject);
begin
  // Add three grips at 25%, 50% and 75% of the image width
  ImageEnView1.RulerParams.HorzGripsCount := 3;
  ImageEnView1.RulerParams.GripsPosBase := ierbBitmap; // Units are relative to the bitmap
  ImageEnView1.RulerParams.HorzGripsPos[ 0 ] := MulDiv( ImageEnView1.IEBitmap.Width, 1, 4 );
  ImageEnView1.RulerParams.HorzGripsPos[ 1 ] := MulDiv( ImageEnView1.IEBitmap.Width, 2, 4 );
  ImageEnView1.RulerParams.HorzGripsPos[ 2 ] := MulDiv( ImageEnView1.IEBitmap.Width, 3, 4 );

  // Add three grips at 25%, 50% and 75% of the image height
  ImageEnView1.RulerParams.VertGripsCount := 3;
  ImageEnView1.RulerParams.GripsPosBase := ierbBitmap; // Units are relative to the bitmap
  ImageEnView1.RulerParams.VertGripsPos[ 0 ] := MulDiv( ImageEnView1.IEBitmap.Height, 1, 4 );
  ImageEnView1.RulerParams.VertGripsPos[ 1 ] := MulDiv( ImageEnView1.IEBitmap.Height, 2, 4 );
  ImageEnView1.RulerParams.VertGripsPos[ 2 ] := MulDiv( ImageEnView1.IEBitmap.Height, 3, 4 );
end;

procedure TForm1.miAlignRulerClick(Sender: TObject);
begin
  ImageEnView1.RulerParams.AlignToImage := miAlignRuler.Checked;
end;


procedure TForm1.miInvertedClick(Sender: TObject);
begin
  ImageEnView1.LockUpdate();

  if miInverted.Checked then
  begin
    // Move rulers
    ImageEnView1.RulerParams.HorzPos := gdDown;
    ImageEnView1.RulerParams.VertPos := gdRight;

    // Reverse direction of measurements
    ImageEnView1.RulerParams.HorzInverted := True;
    ImageEnView1.RulerParams.VertInverted := True;
  end
  else
  begin
    // Move rulers
    ImageEnView1.RulerParams.HorzPos := gdUp;
    ImageEnView1.RulerParams.VertPos := gdLeft;

    // Reverse direction of measurements
    ImageEnView1.RulerParams.HorzInverted := False;
    ImageEnView1.RulerParams.VertInverted := False;
  end;

  ImageEnView1.UnlockUpdate();
end;


procedure TForm1.miLockGripsClick(Sender: TObject);
const
  Lock_Grips_To_Label = True; // snap to integer values, or closest label tick?
begin
  if miLockGrips.Checked = False then
    ImageEnView1.RulerParams.SnapGrips := iesnNone
  else
  if Lock_Grips_To_Label then
    ImageEnView1.RulerParams.SnapGrips := iesnSnapToLabel
  else
    ImageEnView1.RulerParams.SnapGrips := iesnSnapToWholeNumber;
end;

procedure TForm1.miNextKindClick(Sender: TObject);
var
  nextKind: TGripKind;
begin
  nextKind := TGripKind( Ord( ImageEnView1.RulerParams.GripKindDefault ) + 1 );
  if nextKind = gkNone then
    nextKind := gkTriangle;
  ImageEnView1.RulerParams.GripKindDefault := nextKind;
end;

procedure TForm1.OnSelectUnits(Sender: TObject);
begin
  if Sender = miPixels then
    ImageEnView1.RulerParams.Units := ieruPixels
  else
  if Sender = miInches then
    ImageEnView1.RulerParams.Units := ieruInches
  else
  if Sender = miMillimeters then
    ImageEnView1.RulerParams.Units := ieruMillimeters
  else
  if Sender = miCentimeters then
    ImageEnView1.RulerParams.Units := ieruCentimeters;
end;

procedure TForm1.ViewMenuClick(Sender: TObject);
begin
  miNextKind.Enabled := ImageEnView1.RulerParams.HorzGripsCount > 0;
end;


end.