<?php
	/* Libchart - PHP chart library
	 * Copyright (C) 2005-2007 Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
	 *
	 * This program is free software: you can redistribute it and/or modify
	 * it under the terms of the GNU General Public License as published by
	 * the Free Software Foundation, either version 3 of the License, or
	 * (at your option) any later version.
	 *
	 * This program 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 General Public License for more details.
	 *
	 * You should have received a copy of the GNU General Public License
	 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
	 *
	 */

	defined('FULL_PATH') or die('restricted access!');

	/**
	 * The plot holds graphical attributes, and is responsible for computing the layout of the graph.
	 * The layout is quite simple right now, with 4 areas laid out like that:
	 * (of course this is subject to change in the future).
	 *
	 * output area------------------------------------------------|
	 * |  (outer padding)                                         |
	 * |  image area--------------------------------------------| |
	 * |  | (title padding)                                     | |
	 * |  | title area----------------------------------------| | |
	 * |  | |-------------------------------------------------| | |
	 * |  |                                                     | |
	 * |  | (graph padding)              (caption padding)      | |
	 * |  | graph area----------------|  caption area---------| | |
	 * |  | |                         |  |                    | | |
	 * |  | |                         |  |                    | | |
	 * |  | |                         |  |                    | | |
	 * |  | |                         |  |                    | | |
	 * |  | |                         |  |                    | | |
	 * |  | |-------------------------|  |--------------------| | |
	 * |  |                                                     | |
	 * |  |-----------------------------------------------------| |
	 * |                                                          |
	 * |----------------------------------------------------------|
	 *
	 * All area dimensions are known in advance , and the optional logo is drawn in absolute coordinates.
	 *
	 * @author Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
	 * Created on 27 july 2007
	 */
	class LibchartPlot {
		// Style properties
		protected $title;
		protected $logoFileName;

		// Outer area, whose dimension is the same as the PNG returned
		protected $outputArea;

		// Outer padding surrounding the whole image, everything outside is blank
		protected $outerPadding;

		// Coordinates of the area inside the outer padding
		protected $imageArea;

		// Fixed title height in pixels
		protected $titleHeight;

		// Padding of the title area
		protected $titlePadding;

		// Coordinates of the title area
		protected $titleArea;

		// True if the plot has a caption
		protected $hasCaption;

		// Ratio of graph/caption in width
		protected $graphCaptionRatio;

		// Padding of the graph area
		protected $graphPadding;

		// Coordinates of the graph area
		protected $graphArea;

		// Padding of the caption area
		protected $captionPadding;

		// Coordinates of the caption area
		protected $captionArea;

		/**
		 * Text writer.
		 */
		protected $text;

		/**
		 * Color palette.
		 */
		protected $palette;

		/**
		 * GD image
		 */
		protected $img;

		/**
		 * Drawing primitives
		 */
		protected $primitive;

		protected $backGroundColor;
		protected $textColor;

		/**
		 * Constructor of Plot.
		 *
		 * @param integer width of the image
		 * @param integer height of the image
		 */
		public function __construct($width, $height) {
			$this->width = $width;
			$this->height = $height;

			$this->text = new LibchartText();
			$this->palette = new LibchartPalette();

			// Default layout
			$this->outputArea = new LibchartRectangle(0, 0, $width - 1, $height - 1);
			$this->outerPadding = new LibchartPadding(5);
			$this->titleHeight = 26;
			$this->titlePadding = new LibchartPadding(5);
			$this->hasCaption = false;
			$this->graphCaptionRatio = 0.50;
			$this->graphPadding = new LibchartPadding(50);
			$this->captionPadding = new LibchartPadding(15);
		}

		/**
		 * Compute the area inside the outer padding (outside is white).
		 */
		private function computeImageArea() {
			$this->imageArea = $this->outputArea->getPaddedRectangle($this->outerPadding);
		}

		/**
		 * Compute the title area.
		 */
		private function computeTitleArea() {
			$titleUnpaddedBottom = $this->imageArea->y1 + $this->titleHeight + $this->titlePadding->top + $this->titlePadding->bottom;
			$titleArea = new LibchartRectangle(
					$this->imageArea->x1,
					$this->imageArea->y1,
					$this->imageArea->x2,
					$titleUnpaddedBottom - 1
			);
			$this->titleArea = $titleArea->getPaddedRectangle($this->titlePadding);
		}

		/**
		 * Compute the graph area.
		 */
		private function computeGraphArea() {
			$titleUnpaddedBottom = $this->imageArea->y1 + $this->titleHeight + $this->titlePadding->top + $this->titlePadding->bottom;
			$graphArea = null;
			if ($this->hasCaption) {
				$graphUnpaddedRight = $this->imageArea->x1 + ($this->imageArea->x2 - $this->imageArea->x1) * $this->graphCaptionRatio
						+ $this->graphPadding->left + $this->graphPadding->right;
				$graphArea = new LibchartRectangle(
						$this->imageArea->x1,
						$titleUnpaddedBottom,
						$graphUnpaddedRight - 1,
						$this->imageArea->y2
				);
			} else {
				$graphArea = new LibchartRectangle(
						$this->imageArea->x1,
						$titleUnpaddedBottom,
						$this->imageArea->x2,
						$this->imageArea->y2
				);
			}
			$this->graphArea = $graphArea->getPaddedRectangle($this->graphPadding);
		}

		/**
		 * Compute the caption area.
		 */
		private function computeCaptionArea() {
			$graphUnpaddedRight = $this->imageArea->x1 + ($this->imageArea->x2 - $this->imageArea->x1) * $this->graphCaptionRatio
					+ $this->graphPadding->left + $this->graphPadding->right;
			$titleUnpaddedBottom = $this->imageArea->y1 + $this->titleHeight + $this->titlePadding->top + $this->titlePadding->bottom;
			$captionArea = new LibchartRectangle(
					$graphUnpaddedRight,
					$titleUnpaddedBottom,
					$this->imageArea->x2,
					$this->imageArea->y2
			);
			$this->captionArea = $captionArea->getPaddedRectangle($this->captionPadding);
		}

		/**
		 * Compute the layout of all areas of the graph.
		 */
		public function computeLayout() {
			$this->computeImageArea();
			$this->computeTitleArea();
			$this->computeGraphArea();
			if ($this->hasCaption) {
				$this->computeCaptionArea();
			}
		}

		/**
		 * Creates and initialize the image.
		 */
		public function createImage() {
			$this->img = imagecreatetruecolor($this->width, $this->height);

			$this->primitive = new LibchartPrimitive($this->img);

			$this->backGroundColor = new LibchartColor(255, 255, 255);
			$this->textColor = new LibchartColor(0, 0, 0);

			// White background
			imagefilledrectangle($this->img, 0, 0, $this->width - 1, $this->height - 1, $this->backGroundColor->getColor($this->img));

			//imagerectangle($this->img, $this->imageArea->x1, $this->imageArea->y1, $this->imageArea->x2, $this->imageArea->y2, $this->palette->red->getColor($this->img));
		}

		/**
		 * Print the title to the image.
		 */
		public function printTitle() {
			$yCenter = $this->titleArea->y1 + ($this->titleArea->y2 - $this->titleArea->y1) / 2;
			$this->text->printCentered($this->img, $yCenter, $this->textColor, $this->title, $this->text->fontCondensedBold);
		}

		/**
		 * Print the logo image to the image.
		 */
		public function printLogo() {
			@$logoImage = imageCreateFromPNG($this->logoFileName);

			if ($logoImage) {
				imagecopymerge($this->img, $logoImage, 2 * $this->outerPadding->left, $this->outerPadding->top, 0, 0, imagesx($logoImage), imagesy($logoImage), 100);
			}
		}

		/**
		 * Renders to a file or to standard output.
		 *
		 * @param fileName File name (optional)
		 */
		public function render($fileName) {
			if (isset($fileName)) {
				imagepng($this->img, $fileName);
			} else {
				imagepng($this->img);
			}
		}

		/**
		 * Sets the title.
		 *
		 * @param string New title
		 */
		public function setTitle($title) {
			$this->title = $title;
		}

		/**
		 * Sets the logo image file name.
		 *
		 * @param string New logo image file name
		 */
		public function setLogoFileName($logoFileName) {
			$this->logoFileName = $logoFileName;
		}

		/**
		 * Return the GD image.
		 *
		 * @return GD Image
		 */
		public function getImg() {
			return $this->img;
		}

		/**
		 * Return the palette.
		 *
		 * @return palette
		 */
		public function getPalette() {
			return $this->palette;
		}

		/**
		 * Return the text.
		 *
		 * @return text
		 */
		public function getText() {
			return $this->text;
		}

		/**
		 * Return the primitive.
		 *
		 * @return primitive
		 */
		public function getPrimitive() {
			return $this->primitive;
		}

		/**
		 * Return the outer padding.
		 *
		 * @param integer Outer padding value in pixels
		 */
		public function getOuterPadding() {
			return $outerPadding;
		}

		/**
		 * Set the outer padding.
		 *
		 * @param integer Outer padding value in pixels
		 */
		public function setOuterPadding($outerPadding) {
			$this->outerPadding = $outerPadding;
		}

		/**
		 * Return the title height.
		 *
		 * @param integer title height
		 */
		public function setTitleHeight($titleHeight) {
			$this->titleHeight = $titleHeight;
		}

		/**
		 * Return the title padding.
		 *
		 * @param integer title padding
		 */
		public function setTitlePadding($titlePadding) {
			$this->titlePadding = $titlePadding;
		}

		/**
		 * Return the graph padding.
		 *
		 * @param integer graph padding
		 */
		public function setGraphPadding($graphPadding) {
			$this->graphPadding = $graphPadding;
		}

		/**
		 * Set if the graph has a caption.
		 *
		 * @param boolean graph has a caption
		 */
		public function setHasCaption($hasCaption) {
			$this->hasCaption = $hasCaption;
		}

		/**
		 * Set the caption padding.
		 *
		 * @param integer caption padding
		 */
		public function setCaptionPadding($captionPadding) {
			$this->captionPadding = $captionPadding;
		}

		/**
		 * Set the graph/caption ratio.
		 *
		 * @param integer caption padding
		 */
		public function setGraphCaptionRatio($graphCaptionRatio) {
			$this->graphCaptionRatio = $graphCaptionRatio;
		}

		/**
		 * Return the graph area.
		 *
		 * @return graph area
		 */
		public function getGraphArea() {
			return $this->graphArea;
		}

		/**
		 * Return the caption area.
		 *
		 * @return caption area
		 */
		public function getCaptionArea() {
			return $this->captionArea;
		}

		/**
		 * Return the text color.
		 *
		 * @return text color
		 */
		public function getTextColor() {
			return $this->textColor;
		}
	}