<?php
/**
 * ClickHeat : Classe de génération des cartes depuis un fichier ClickHeat / Maps generation class from a ClickHeat logfile
 * 
 * Cette classe est VOLONTAIREMENT écrite pour PHP 4
 * This class is VOLUNTARILY written for PHP 4
 * 
 * @author Yvan Taviaud - LabsMedia - www.labsmedia.com
 * @since 12/05/2007
**/

class HeatmapFromClicks extends Heatmap
{
	// array $files Logfiles to use
	private $files = array();

	// integer $minScreen Screen size filter
	public $minScreen;

	// integer $maxScreen Screen size filter
	public $maxScreen;

	/**
	 * Add a file to parse and check existence
	 *
	 * @param string $file
	 */
	public function addFile($file)
	{
		if (file_exists($file))
		{
			$this->files[] = $file;
		}
	}

	/**
	 * Do some tasks before drawing (database connection...)
	 */
	public function startDrawing()
	{
		return true;
	}

	/**
	 * Find pixels coords and draw these on the current image
	 *
	 * @param integer $image Number of the image (to be used with $this->height)
	 * @return boolean Success
	 */
	public function drawPixels($image)
	{
		/**
		 * If it's not the first image,
		 * just use the value stored in the temp files
		 */
		if ($image !== 0)
		{
			if (file_exists($this->cache.sprintf($this->file, $image).'_log'))
			{
				$f = fopen($this->cache.sprintf($this->file, $image).'_log', 'r');
				while (feof($f) === false)
				{
					$click = explode('|', trim(fgets($f, 1024)));
					if (count($click) === 3)
					{
						$x = (int) $click[0];
						$y = (int) $click[1];
						$c = (bool) $click[2];
						if ($this->heatmap)
						{
							/**
							 * Apply a calculus for the step,
							 * with increases the speed of rendering:
							 * step = 3, then pixel is drawn at x = 2 (center of a 3x3 square)
							 */
							$x -= $x % $this->step - $this->startStep;
							$y -= $y % $this->step - $this->startStep;

							/**
							 * Add 1 to the current color of this pixel
							 * (color which represents the sum of clicks on this pixel)
							 */
							$color = imagecolorat($this->image, $x, $y) + 1;
							imagesetpixel($this->image, $x, $y, $color);
							$this->maxClicks = max($this->maxClicks, $color);
						}
						else
						{
							/** Put a red or green cross at the click location */
							$color = $c === true ? 0xFF0000 : 0x00DC00;
							imageline($this->image, $x - 2, $y - 2, $x + 2, $y + 2, $color);
							imageline($this->image, $x + 2, $y - 2, $x - 2, $y + 2, $color);
						}
					}
				}
				fclose($f);
				unlink($this->cache.sprintf($this->file, $image).'_log');
			}
			return true;
		}

		$leftWidth = 10;//(int) $this->layout[1];
		$centerWidth = 0;//(int) $this->layout[2];
		$rightWidth = 0;//(int) $this->layout[3];
		if ($leftWidth !== 0 && $centerWidth !== 0 && $rightWidth === 0)
		{
			/**
			 * Fixed left menu and fixed center ?
			 * Fall back to a fixed left menu only
			 */
			$leftWidth += $centerWidth;
			$centerWidth = 0;
		}
		elseif ($leftWidth === 0 && $centerWidth !== 0 && $rightWidth !== 0)
		{
			/**
			 * Fixed right menu and fixed center ?
			 * Fall back to a fixed right menu only
			 */
			$rightWidth += $centerWidth;
			$centerWidth = 0;
		}
		elseif ($leftWidth !== 0 && $centerWidth !== 0 && $rightWidth !== 0)
		{
			/**
			 * Everything is fixed ??
			 */
			return $this->raiseError(LANG_ERROR_FIXED);
		}
		$totalWidth = $leftWidth + $centerWidth + $rightWidth;

		for ($file = 0; $file < count($this->files); $file++)
		{
			/** Read clicks in the log file */
			$f = @fopen($this->files[$file], 'r');
			if ($f === false)
			{
				return $this->raiseError(LANG_ERROR_FILE.': '.$this->files[$file]);
			}

			$buffer = '';
			$count = 0;
			while (true)
			{
				$buffer .= fgets($f, 1024);
				// Grouping by 1000 clicks
				if (feof($f) === false && $count++ !== 1000)
					continue;

				/** Do a regular match (faster and easier for large volume of data) */
				preg_match_all('~^(\d+)\|(\d+)\|(\d+)\|(\d+)$~m', $buffer, $clicks);
				$buffer = '';

				for ($i = 0, $max = count($clicks[1]); $i < $max; $i++)
				{
					$x = (int) $clicks[1][$i]; // X
					$y = (int) $clicks[2][$i]; // Y
					$w = (int) $clicks[3][$i]; // display width
					$c = ($clicks[4][$i] < 3); // left click

					/**
					 * X is not in the range of sizes,
					 * or right click for heatmap,
					 * or X is greater than screen size,
					 * the website is too large for the window,
					 * so we don't know where the click is... ignore those clicks
					 */
					if ($x <= $this->minScreen || $x > $this->maxScreen || $this->heatmap && $c === false || $x > $w)
						continue;

					/**
					 * Correction of X for liquid and/or fixed layouts
					 */

					if ($w <= $totalWidth) {
						/**
						 * Display's width is less than fixed content's one,
						 * X is absolute
						 */
					}

					elseif ($leftWidth !== 0 && $centerWidth === 0 && $rightWidth === 0) {

						// Left fixed menu
						if ($x <= $leftWidth) {
							// Click in the left menu: X is good

						} else {
							// Apply a percentage on the rest of the screen
							$x = $leftWidth + ceil(($this->width - $leftWidth) * ($x - $leftWidth) / ($w - $leftWidth));
						}

					}

					elseif ($leftWidth === 0 && $centerWidth === 0 && $rightWidth !== 0) {
						// Right fixed menu
						if ($w - $x <= $rightWidth)
							/**
							 * Click in the right menu:
							 * X is good, but relative to the right border
							 */
							$x = $this->width - ($w - $x);

						else
							/**
							 * Apply a percentage on the rest of the screen
							 */
							$x = ceil(($this->width - $rightWidth) * $x / ($w - $rightWidth));
					}

					elseif ($leftWidth !== 0 && $centerWidth === 0 && $rightWidth !== 0) {

						// Left and right fixed menus
						if ($w - $x <= $rightWidth) {
							/**
							 * Click in the right menu:
							 * X is good, but relative to the right border
							 */
							$x = $this->width - ($w - $x);

						} elseif ($x <= $leftWidth) {

							/**
							 * Click in the left menu: X is good
							 */

						} else {
							/**
							 * Apply a percentage on the rest of the screen
							 */
							$x = $leftWidth + ceil(($this->width - $leftWidth - $rightWidth) * ($x - $leftWidth) / ($w - $leftWidth - $rightWidth));
						}

					}

					elseif ($leftWidth === 0 && $centerWidth !== 0 && $rightWidth === 0) {

						// Fixed centered content
						if (abs($x - $w / 2) <= $centerWidth / 2)
							/**
							 * Click is in the centered content
							 */
							$x = ($this->width - $w) / 2 + $x;

						elseif ($x < $w / 2)
							/**
							 * Click is at the left of the centered content
							 */
							$x = ($this->width - $centerWidth) / ($w - $centerWidth) * $x;

						else
							/**
							 * Click is at the right of the centered content
							 */
							$x = ($this->width + $centerWidth) / 2 + ($this->width - $centerWidth) / ($w - $centerWidth) * ($x - ($w + $centerWidth) / 2);

					} else {
						/**
						 * Layout 100%
						 */
						$x = $this->width / $w * $x;
					}

					$x = (int) $x;
					$y = (int) $y;
					if ($x < 0 || $x >= $this->width)
						continue;

					if ($y >= 0 && $y < $this->height) {
						if ($this->heatmap) {
							/**
							 * Apply a calculus for the step,
							 * with increases the speed of rendering:
							 * step = 3, then pixel is drawn at x = 2 (center of a 3x3 square)
							 */
							$x -= $x % $this->step - $this->startStep;
							$y -= $y % $this->step - $this->startStep;

							/**
							 * Add 1 to the current color of this pixel
							 * (color which represents the sum of clicks on this pixel)
							 */
							$color = imagecolorat($this->image, $x, $y) + 1;
							imagesetpixel($this->image, $x, $y, $color);
							$this->maxClicks = max($this->maxClicks, $color);

						} else {
							/**
							 * Put a red or green cross at the click location
							 */
							$color = $c === true ? 0xFF0000 : 0x00DC00;
							imageline($this->image, $x - 2, $y - 2, $x + 2, $y + 2, $color);
							imageline($this->image, $x + 2, $y - 2, $x - 2, $y + 2, $color);
						}
					} else {
						// Append to the temporary log of this image
						error_log($x.'|'.($y % $this->height).'|'.$c."\n", 3, $this->cache . sprintf($this->file, ceil($y / $this->height) - 1).'_log');
					}

					/**
					 * Looking for the maximum height of click
					 */
					$this->maxY = max($y, $this->maxY);
				}
				unset($clicks);

				if ($count !== 1001)
					break;
				$count = 0;
			}
			fclose($f);
		}
		return true;
	}

	/**
	 * Do some cleaning or ending tasks (close database, reset array...)
	 */
	function finishDrawing()
	{
		$this->files = array();
		return true;
	}
}
?>