<?php
/**
 * DOMPDF - PHP5 HTML to PDF renderer
 *
 * File: $RCSfile: canvas.cls.php,v $
 * Created on: 2004-06-06
 *
 * Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library in the file LICENSE.LGPL; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307 USA
 *
 * Alternatively, you may distribute this software under the terms of the
 * PHP License, version 3.0 or later.  A copy of this license should have
 * been distributed with this file in the file LICENSE.PHP .  If this is not
 * the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
 *
 * The latest version of DOMPDF might be available at:
 * http://www.dompdf.com/
 *
 * @link http://www.dompdf.com/
 * @copyright 2004 Benj Carson
 * @author Benj Carson <benjcarson@digitaljunkies.ca>
 * @package dompdf

 */

/* $Id: canvas.cls.php 357 2011-01-30 20:56:46Z fabien.menager $ */

/**
 * Main rendering interface
 *
 * Currently {@link CPDF_Adapter}, {@link PDFLib_Adapter}, {@link TCPDF_Adapter}, and {@link GD_Adapter}
 * implement this interface.
 *
 * Implementations should measure x and y increasing to the left and down,
 * respectively, with the origin in the top left corner.  Implementations
 * are free to use a unit other than points for length, but I can't
 * guarantee that the results will look any good.
 *
 * @package dompdf
 */
interface Canvas {

  /**
   * Returns the current page number
   *
   * @return int
   */
  function get_page_number();

  /**
   * Returns the total number of pages
   *
   * @return int
   */
  function get_page_count();

  /**
   * Sets the total number of pages
   *
   * @param int $count
   */
  function set_page_count($count);

  /**
   * Draws a line from x1,y1 to x2,y2
   *
   * See {@link Style::munge_colour()} for the format of the colour array.
   * See {@link Cpdf::setLineStyle()} for a description of the format of the
   * $style parameter (aka dash).
   *
   * @param float $x1
   * @param float $y1
   * @param float $x2
   * @param float $y2
   * @param array $color
   * @param float $width
   * @param array $style
   */
  function line($x1, $y1, $x2, $y2, $color, $width, $style = null);

  /**
   * Draws a rectangle at x1,y1 with width w and height h
   *
   * See {@link Style::munge_colour()} for the format of the colour array.
   * See {@link Cpdf::setLineStyle()} for a description of the $style
   * parameter (aka dash)
   *
   * @param float $x1
   * @param float $y1
   * @param float $w
   * @param float $h
   * @param array $color
   * @param float $width
   * @param array $style
   */
  function rectangle($x1, $y1, $w, $h, $color, $width, $style = null);

  /**
   * Draws a filled rectangle at x1,y1 with width w and height h
   *
   * See {@link Style::munge_colour()} for the format of the colour array.
   *
   * @param float $x1
   * @param float $y1
   * @param float $w
   * @param float $h
   * @param array $color
   */
  function filled_rectangle($x1, $y1, $w, $h, $color);

  /**
   * Starts a clipping rectangle at x1,y1 with width w and height h
   *
   * @param float $x1
   * @param float $y1
   * @param float $w
   * @param float $h
   */
  function clipping_rectangle($x1, $y1, $w, $h);

  /**
   * Ends the last clipping shape
   */
  function clipping_end();

  /**
   * Save current state
   */
  function save();

  /**
   * Restore last state
   */
  function restore();

  /**
   * Rotate
   */
  function rotate($angle, $x, $y);

  /**
   * Skew
   */
  function skew($angle_x, $angle_y, $x, $y);

  /**
   * Scale
   */
  function scale($s_x, $s_y, $x, $y);

  /**
   * Translate
   */
  function translate($t_x, $t_y);

  /**
   * Transform
   */
  function transform($a, $b, $c, $d, $e, $f);

  /**
   * Draws a polygon
   *
   * The polygon is formed by joining all the points stored in the $points
   * array.  $points has the following structure:
   * <code>
   * array(0 => x1,
   *       1 => y1,
   *       2 => x2,
   *       3 => y2,
   *       ...
   *       );
   * </code>
   *
   * See {@link Style::munge_colour()} for the format of the colour array.
   * See {@link Cpdf::setLineStyle()} for a description of the $style
   * parameter (aka dash)
   *
   * @param array $points
   * @param array $color
   * @param float $width
   * @param array $style
   * @param bool  $fill  Fills the polygon if true
   */
  function polygon($points, $color, $width = null, $style = null, $fill = false);

  /**
   * Draws a circle at $x,$y with radius $r
   *
   * See {@link Style::munge_colour()} for the format of the colour array.
   * See {@link Cpdf::setLineStyle()} for a description of the $style
   * parameter (aka dash)
   *
   * @param float $x
   * @param float $y
   * @param float $r
   * @param array $color
   * @param float $width
   * @param array $style
   * @param bool $fill Fills the circle if true
   */
  function circle($x, $y, $r, $color, $width = null, $style = null, $fill = false);

  /**
   * Add an image to the pdf.
   *
   * The image is placed at the specified x and y coordinates with the
   * given width and height.
   *
   * @param string $img_url the path to the image
   * @param string $img_type the type (e.g. extension) of the image
   * @param float $x x position
   * @param float $y y position
   * @param int $w width (in pixels)
   * @param int $h height (in pixels)
   */
  function image($img_url, $img_type, $x, $y, $w, $h);

  /**
   * Writes text at the specified x and y coordinates
   *
   * See {@link Style::munge_colour()} for the format of the colour array.
   *
   * @param float $x
   * @param float $y
   * @param string $text the text to write
   * @param string $font the font file to use
   * @param float $size the font size, in points
   * @param array $color
   * @param float $word_space word spacing adjustment
   * @param float $char_space whar spacing adjustment
   * @param float $angle angle
   */
  function text($x, $y, $text, $font, $size, $color = array(0,0,0), $word_space = 0, $char_space = 0, $angle = 0);

  /**
   * Add a named destination (similar to <a name="foo">...</a> in html)
   *
   * @param string $anchorname The name of the named destination
   */
  function add_named_dest($anchorname);

  /**
   * Add a link to the pdf
   *
   * @param string $url The url to link to
   * @param float  $x   The x position of the link
   * @param float  $y   The y position of the link
   * @param float  $width   The width of the link
   * @param float  $height   The height of the link
   */
  function add_link($url, $x, $y, $width, $height);

  /**
   * Add meta information to the pdf
   *
   * @param string $label  label of the value (Creator, Producer, etc.)
   * @param string $value  the text to set
   */
  function add_info($name, $value);

  /**
   * Calculates text size, in points
   *
   * @param string $text the text to be sized
   * @param string $font the desired font
   * @param float  $size the desired font size
   * @param float  $spacing word spacing, if any
   * @return float
   */
  function get_text_width($text, $font, $size, $word_spacing = 0, $char_spacing = 0);

  /**
   * Calculates font height, in points
   *
   * @param string $font
   * @param float $size
   * @return float
   */
  function get_font_height($font, $size);

  /**
   * Sets the opacity
   *
   * @param float $opacity
   * @param string $mode
   * @return float
   */
  function set_opacity($opacity, $mode = "Normal");

  /**
   * Starts a new page
   *
   * Subsequent drawing operations will appear on the new page.
   */
  function new_page();

  /**
   * Streams the PDF directly to the browser
   *
   * @param string $filename the name of the PDF file
   * @param array  $options associative array, 'Attachment' => 0 or 1, 'compress' => 1 or 0
   */
  function stream($filename, $options = null);

  /**
   * Returns the PDF as a string
   *
   * @param array  $options associative array: 'compress' => 1 or 0
   * @return string
   */
  function output($options = null);

}