{
Copyright © 1999 by Delphi 5 Developer's Guide - Xavier Pacheco and Steve Teixeira
}
unit MainFrm;
interface
uses
 SysUtils, Windows, Messages, Classes, Graphics, Controls,
 Forms, Dialogs, Menus;
const
 DString = 'Delphi 5 YES!';
 DString2 = 'Delphi 5 Rocks!';
type
 TMainForm = class(TForm)
  mmMain: TMainMenu;
  mmiText: TMenuItem;
  mmiTextRect: TMenuItem;
  mmiTextSize: TMenuItem;
  mmiDrawTextCenter: TMenuItem;
  mmiDrawTextRight: TMenuItem;
  mmiDrawTextLeft: TMenuItem;
  procedure mmiTextRectClick(Sender: TObject);
  procedure mmiTextSizeClick(Sender: TObject);
  procedure mmiDrawTextCenterClick(Sender: TObject);
  procedure mmiDrawTextRightClick(Sender: TObject);
  procedure mmiDrawTextLeftClick(Sender: TObject);
 public
  procedure ClearCanvas;
 end;
var
 MainForm: TMainForm;
implementation
{$R *.DFM}
procedure TMainForm.ClearCanvas;
begin
 with Canvas do
 begin
  Brush.Style := bsSolid;
  Brush.Color := clWhite;
  FillRect(ClipRect);
 end;
end;
procedure TMainForm.mmiTextRectClick(Sender: TObject);
var
 R: TRect;
 TWidth, THeight: integer;
begin
 ClearCanvas;
 Canvas.Font.Size := 18;
 // Calculate the width/height of the text string
 TWidth := Canvas.TextWidth(DString);
 THeight := Canvas.TextHeight(DString);
 { Initialize a TRect structure. The height of this rectangle will
  be 1/2 the height of the text string height. This is to
  illustrate clipping the text by the rectangle drawn }
 R := Rect(1, THeight div 2, TWidth + 1, THeight + (THeight div 2));
 // Draw a rectangle based on the text sizes
 Canvas.Rectangle(R.Left - 1, R. - 1, R.Right + 1, R.Bottom + 1);
 // Draw the Text within the rectangle
 Canvas.TextRect(R, 0, 0, DString);
end;
procedure TMainForm.mmiTextSizeClick(Sender: TObject);
begin
 ClearCanvas;
 with Canvas do
 begin
  Font.Size := 18;
  TextOut(10, 10, DString);
  TextOut(50, 50, 'TextWidth = ' + IntToStr(TextWidth(DString)));
  TextOut(100, 100, 'TextHeight = ' + IntToStr(TextHeight(DString)));
 end;
end;
procedure TMainForm.mmiDrawTextCenterClick(Sender: TObject);
var
 R: TRect;
begin
 ClearCanvas;
 Canvas.Font.Size := 10;
 R := Rect(10, 10, 80, 100);
 // Draw a rectangle to surround the TRect boundaries by 2 pixels }
 Canvas.Rectangle(R.Left - 2, R. - 2, R.Right + 2, R.Bottom + 2);
 // Draw text centered by specifying the dt_Center option
 DrawText(Canvas.Handle, PChar(DString2), -1, R, dt_WordBreak or dt_Center);
end;
procedure TMainForm.mmiDrawTextRightClick(Sender: TObject);
var
 R: TRect;
begin
 ClearCanvas;
 Canvas.Font.Size := 10;
 R := Rect(10, 10, 80, 100);
 // Draw a rectangle to surround the TRect boundaries by 2 pixels
 Canvas.Rectangle(R.Left - 2, R. - 2, R.Right + 2, R.Bottom + 2);
 // Draw text right-aligned by specifying the dt_Right option
 DrawText(Canvas.Handle, PChar(DString2), -1, R, dt_WordBreak or dt_Right);
end;
procedure TMainForm.mmiDrawTextLeftClick(Sender: TObject);
var
 R: TRect;
begin
 ClearCanvas;
 Canvas.Font.Size := 10;
 R := Rect(10, 10, 80, 100);
 // Draw a rectangle to surround the TRect boudries by 2 pixels
 Canvas.Rectangle(R.Left - 2, R. - 2, R.Right + 2, R.Bottom + 2);
 // Draw text left-aligned by specifying the dt_Left option
 DrawText(Canvas.Handle, PChar(DString2), -1, R, dt_WordBreak or dt_Left);
end;
end.