{*
 * << Alternative PDF Library 1.0.0 >> -- LineDemo.dpr
 *
 * Copyright (c) 1999-2006 Takeshi Kanno <takeshi_kanno@est.hi-ho.ne.jp>
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.
 * It is provided 'as is' without express or implied warranty.
 *
 *}
program LineDemo;

{$APPTYPE CONSOLE}

uses
  SysUtils, hpdf, hpdf_types, hpdf_consts;

procedure
error_handler (error_no: HPDF_STATUS; detail_no: HPDF_STATUS;
              user_data: Pointer); stdcall;
var
  message: string;
begin
  message := 'ERROR: ' + IntToStr(error_no) + '-' + IntToStr(detail_no);
  raise Exception.Create(message);
end;

procedure draw_line (page: HPDF_Page; x: Single; y: Single; const text: PChar);
begin
  HPDF_Page_BeginText(page);
  HPDF_Page_MoveTextPos(page, x, y - 10);
  HPDF_Page_ShowText(page, text);
  HPDF_Page_EndText(page);

  HPDF_Page_MoveTo(page, x, y - 15);
  HPDF_Page_LineTo(page, x + 220, y - 15);
  HPDF_Page_Stroke(page);
end;

procedure draw_line2 (page: HPDF_Page; x: Single; y: Single; const text: PChar);
begin
  HPDF_Page_BeginText(page);
  HPDF_Page_MoveTextPos(page, x, y);
  HPDF_Page_ShowText(page, text);
  HPDF_Page_EndText(page);

  HPDF_Page_MoveTo(page, x + 30, y - 25);
  HPDF_Page_LineTo(page, x + 160, y - 25);
  HPDF_Page_Stroke(page);
end;

procedure draw_rect (page: HPDF_Page; x: Double; y: Double; const text: PChar);
begin
  HPDF_Page_BeginText(page);
  HPDF_Page_MoveTextPos(page, x, y - 10);
  HPDF_Page_ShowText(page, text);
  HPDF_Page_EndText(page);

  HPDF_Page_Rectangle(page, x, y - 40, 220, 25);
end;


procedure make_pdf ();
const
  page_title: string = 'Line Demo';
  fname: string = 'LineDemo.pdf';

  DASH_MODE1: array[0..0] of HPDF_UINT16 = (3);
  DASH_MODE2: array[0..1] of HPDF_UINT16 = (7, 3);
  DASH_MODE3: array[0..3] of HPDF_UINT16 = (8, 7, 2, 7);
var
  pdf: HPDF_Doc;
  font: HPDF_Font;
  page: HPDF_Page;

  x: Double;
  y: Double;
  x0: Double;
  y0: Double;
  x1: Double;
  y1: Double;
  x2: Double;
  y2: Double;
  x3: Double;
  y3: Double;

  tw: Single;
begin
  pdf := HPDF_New(@error_handler, nil);
  if pdf = nil then
  begin
    WriteLn('error: cannot create PdfDoc object\n');
    Halt (1);
  end;

  try
    HPDF_SetCompressionMode(pdf, HPDF_COMP_ALL);

    {* create default-font *}
    font := HPDF_GetFont(pdf, 'Helvetica', nil);

    {* add a new page object. *}
    page := HPDF_AddPage(pdf);

    {* print the lines of the page. *}
    HPDF_Page_SetLineWidth(page, 1);
    x := HPDF_Page_GetWidth(page) - 100;
    y := HPDF_Page_GetHeight(page) - 110;
    HPDF_Page_Rectangle(page, 50, 50, x, y);
    HPDF_Page_Stroke(page);

    {* print the title of the page (with positioning center). *}
    HPDF_Page_SetFontAndSize(page, font, 24);
    tw := HPDF_Page_TextWidth(page, PChar(page_title));
    HPDF_Page_BeginText(page);

    x := (HPDF_Page_GetWidth(page) - tw) / 2;
    y := HPDF_Page_GetHeight(page) - 50;
    HPDF_Page_MoveTextPos (page, x, y);

    HPDF_Page_ShowText (page, PChar(page_title));
    HPDF_Page_EndText (page);

    HPDF_Page_SetFontAndSize (page, font, 10);

    {* Draw verious widths of lines. *}
    HPDF_Page_SetLineWidth (page, 0);
    draw_line (page, 60, 770, 'line width := 0');

    HPDF_Page_SetLineWidth (page, 1.0);
    draw_line (page, 60, 740, 'line width := 1.0');

    HPDF_Page_SetLineWidth (page, 2.0);
    draw_line (page, 60, 710, 'line width := 2.0');

    {* Line dash pattern *}
    HPDF_Page_SetLineWidth (page, 1.0);

    HPDF_Page_SetDash (page, @DASH_MODE1, 1, 1);
    draw_line (page, 60, 680, 'dash_ptn=[3], phase=1 -- 2 on, 3 off, 3 on...');

    HPDF_Page_SetDash (page, @DASH_MODE2, 2, 2);
    draw_line (page, 60, 650, 'dash_ptn=[7, 3], phase=2 -- 5 on 3 off, 7 on,...');

    HPDF_Page_SetDash (page, @DASH_MODE3, 4, 0);
    draw_line (page, 60, 620, 'dash_ptn=[8, 7, 2, 7], phase=0');

    HPDF_Page_SetDash (page, nil, 0, 0);

    HPDF_Page_SetLineWidth (page, 30);
    HPDF_Page_SetRGBStroke (page, 0.0, 0.5, 0.0);

    {* Line Cap Style *}
    HPDF_Page_SetLineCap (page, HPDF_BUTT_END);
    draw_line2 (page, 60, 570, 'PDF_BUTT_END');

    HPDF_Page_SetLineCap (page, HPDF_ROUND_END);
    draw_line2 (page, 60, 505, 'PDF_ROUND_END');

    HPDF_Page_SetLineCap (page, HPDF_PROJECTING_SCUARE_END);
    draw_line2 (page, 60, 440, 'PDF_PROJECTING_SCUARE_END');

    {* Line Join Style *}
    HPDF_Page_SetLineWidth (page, 30);
    HPDF_Page_SetRGBStroke (page, 0.0, 0.0, 0.5);

    HPDF_Page_SetLineJoin (page, HPDF_MITER_JOIN);
    HPDF_Page_MoveTo (page, 120, 300);
    HPDF_Page_LineTo (page, 160, 340);
    HPDF_Page_LineTo (page, 200, 300);
    HPDF_Page_Stroke (page);

    HPDF_Page_BeginText (page);
    HPDF_Page_MoveTextPos (page, 60, 360);
    HPDF_Page_ShowText (page, 'PDF_MITER_JOIN');
    HPDF_Page_EndText (page);

    HPDF_Page_SetLineJoin (page, HPDF_ROUND_JOIN);
    HPDF_Page_MoveTo (page, 120, 195);
    HPDF_Page_LineTo (page, 160, 235);
    HPDF_Page_LineTo (page, 200, 195);
    HPDF_Page_Stroke (page);

    HPDF_Page_BeginText (page);
    HPDF_Page_MoveTextPos (page, 60, 255);
    HPDF_Page_ShowText (page, 'PDF_ROUND_JOIN');
    HPDF_Page_EndText (page);

    HPDF_Page_SetLineJoin (page, HPDF_BEVEL_JOIN);
    HPDF_Page_MoveTo (page, 120, 90);
    HPDF_Page_LineTo (page, 160, 130);
    HPDF_Page_LineTo (page, 200, 90);
    HPDF_Page_Stroke (page);

    HPDF_Page_BeginText (page);
    HPDF_Page_MoveTextPos (page, 60, 150);
    HPDF_Page_ShowText (page, 'PDF_BEVEL_JOIN');
    HPDF_Page_EndText (page);

    {* Draw Rectangle *}
    HPDF_Page_SetLineWidth (page, 2);
    HPDF_Page_SetRGBStroke (page, 0, 0, 0);
    HPDF_Page_SetRGBFill (page, 0.75, 0.0, 0.0);

    draw_rect (page, 300, 770, 'Stroke');
    HPDF_Page_Stroke (page);

    draw_rect (page, 300, 720, 'Fill');
    HPDF_Page_Fill (page);

    draw_rect (page, 300, 670, 'Fill then Stroke');
    HPDF_Page_FillStroke (page);

    {* Clip Rect *}
    HPDF_Page_GSave (page);  {* Save the current graphic state *}
    draw_rect (page, 300, 620, 'Clip Rectangle');
    HPDF_Page_Clip (page);
    HPDF_Page_Stroke (page);
    HPDF_Page_SetFontAndSize (page, font, 13);

    HPDF_Page_BeginText (page);
    HPDF_Page_MoveTextPos (page, 290, 600);
    HPDF_Page_SetTextLeading (page, 12);
    HPDF_Page_ShowText (page,
                'Clip Clip Clip Clip Clip Clipi Clip Clip Clip');
    HPDF_Page_ShowTextNextLine (page,
                'Clip Clip Clip Clip Clip Clip Clip Clip Clip');
    HPDF_Page_ShowTextNextLine (page,
               'Clip Clip Clip Clip Clip Clip Clip Clip Clip');
    HPDF_Page_EndText (page);
    HPDF_Page_GRestore (page);

    x0 := 330;
    y0 := 440;
    x1 := 430;
    y1 := 530;
    x2 := 480;
    y2 := 470;
    x3 := 480;
    y3 := 90;

    {* Curve Example(CurveTo2) *}
    HPDF_Page_SetRGBFill (page, 0, 0, 0);

    HPDF_Page_BeginText (page);
    HPDF_Page_MoveTextPos (page, 300, 540);
    HPDF_Page_ShowText (page, 'CurveTo2(x1, y1, x2. y2)');
    HPDF_Page_EndText (page);

    HPDF_Page_BeginText (page);
    HPDF_Page_MoveTextPos (page, x0 + 5, y0 - 5);
    HPDF_Page_ShowText (page, 'Current point');
    HPDF_Page_MoveTextPos (page, x1 - x0, y1 - y0);
    HPDF_Page_ShowText (page, '(x1, y1)');
    HPDF_Page_MoveTextPos (page, x2 - x1, y2 - y1);
    HPDF_Page_ShowText (page, '(x2, y2)');
    HPDF_Page_EndText (page);

    HPDF_Page_SetDash (page, nil, 0, 0);

    HPDF_Page_SetLineWidth (page, 0.5);
    HPDF_Page_MoveTo (page, x1, y1);
    HPDF_Page_LineTo (page, x2, y2);
    HPDF_Page_Stroke (page);

    HPDF_Page_SetDash (page, nil, 0, 0);

    HPDF_Page_SetLineWidth (page, 1.5);

    HPDF_Page_MoveTo (page, x0, y0);
    HPDF_Page_CurveTo2 (page, x1, y1, x2, y2);
    HPDF_Page_Stroke (page);

    {* Curve Example(CurveTo3) *}
    y0 := y0 - 150;
    y1 := y1 - 150;
    y2 := y2 - 150;

    HPDF_Page_BeginText (page);
    HPDF_Page_MoveTextPos (page, 300, 390);
    HPDF_Page_ShowText (page, 'CurveTo3(x1, y1, x2. y2)');
    HPDF_Page_EndText (page);

    HPDF_Page_BeginText (page);
    HPDF_Page_MoveTextPos (page, x0 + 5, y0 - 5);
    HPDF_Page_ShowText (page, 'Current point');
    HPDF_Page_MoveTextPos (page, x1 - x0, y1 - y0);
    HPDF_Page_ShowText (page, '(x1, y1)');
    HPDF_Page_MoveTextPos (page, x2 - x1, y2 - y1);
    HPDF_Page_ShowText (page, '(x2, y2)');
    HPDF_Page_EndText (page);

    HPDF_Page_SetDash (page, @DASH_MODE1, 1, 1);

    HPDF_Page_SetLineWidth (page, 0.5);
    HPDF_Page_MoveTo (page, x0, y0);
    HPDF_Page_LineTo (page, x1, y1);
    HPDF_Page_Stroke (page);

    HPDF_Page_SetDash (page, nil, 0, 0);

    HPDF_Page_SetLineWidth (page, 1.5);
    HPDF_Page_MoveTo (page, x0, y0);
    HPDF_Page_CurveTo3 (page, x1, y1, x2, y2);
    HPDF_Page_Stroke (page);

    {* Curve Example(CurveTo) *}
    y0 := y0 - 150;
    y1 := y1 - 160;
    y2 := y2 - 130;
    x2 := x2 + 10;

    HPDF_Page_BeginText (page);
    HPDF_Page_MoveTextPos (page, 300, 240);
    HPDF_Page_ShowText (page, 'CurveTo(x1, y1, x2. y2, x3, y3)');
    HPDF_Page_EndText (page);

    HPDF_Page_BeginText (page);
    HPDF_Page_MoveTextPos (page, x0 + 5, y0 - 5);
    HPDF_Page_ShowText (page, 'Current point');
    HPDF_Page_MoveTextPos (page, x1 - x0, y1 - y0);
    HPDF_Page_ShowText (page, '(x1, y1)');
    HPDF_Page_MoveTextPos (page, x2 - x1, y2 - y1);
    HPDF_Page_ShowText (page, '(x2, y2)');
    HPDF_Page_MoveTextPos (page, x3 - x2, y3 - y2);
    HPDF_Page_ShowText (page, '(x3, y3)');
    HPDF_Page_EndText (page);

    HPDF_Page_SetDash (page, @DASH_MODE1, 1, 1);

    HPDF_Page_SetLineWidth (page, 0.5);
    HPDF_Page_MoveTo (page, x0, y0);
    HPDF_Page_LineTo (page, x1, y1);
    HPDF_Page_Stroke (page);
    HPDF_Page_MoveTo (page, x2, y2);
    HPDF_Page_LineTo (page, x3, y3);
    HPDF_Page_Stroke (page);

    HPDF_Page_SetDash (page, nil, 0, 0);

    HPDF_Page_SetLineWidth (page, 1.5);
    HPDF_Page_MoveTo (page, x0, y0);
    HPDF_Page_CurveTo (page, x1, y1, x2, y2, x3, y3);
    HPDF_Page_Stroke (page);

    {* save the document to a file *}
    HPDF_SaveToFile (pdf, PChar(fname));

  except
    on e: Exception do
    begin
      Writeln (e.message);
      HPDF_Free (pdf);
      Halt (1);
    end;
  end;

  {* clean up *}
  HPDF_Free (pdf);
end;

begin
  make_pdf;
end.