added code for gantt chart

Author: yogeeswar2001

.gitignore

@@ -1,2 +1,5 @@
 #ignore input.php file
 input.php
+
+#ignore buffers
+buffer/

algo_sim.php

@@ -40,7 +40,34 @@
 	echo "<tr>".$str."</tr>";
 }
 echo "</table>";
-echo "<h3>AVERAGE WAITING TIME: ".$output[$num_proc]."<br>AVERAGE TURN-AROUND TIME: ".$output[$num_proc+1]."</h3>";
-echo "<h3>GANTT CHART<br>".$output[$num_proc+2]."<br>".$output[$num_proc+3]."</h3>";
+echo "<h4>AVERAGE WAITING TIME: ".$output[$num_proc]."<br>AVERAGE TURN-AROUND TIME: ".$output[$num_proc+1]."</h4>";
+echo "<h4>GANTT CHART<br></h4>";
+
+echo "<table id=\"gantt_chart\">";
+$temp = explode(" ",$output[$num_proc+2]);
+$time = array_slice(explode(" ",$output[$num_proc+3]),1);
+$str="";
+
+$i=0;
+$px=20;
+foreach ($temp as $result) {
+	if( $i == 0)
+		$str = $str."<th style=\"width:".(int)$time[$i]*$px."px\">P".$result."</th>";
+	else 
+		$str = $str."<th style=\"width:".((int)$time[$i]-(int)$time[$i-1])*$px."px\">P".$result."</th>";
+	$i++;
+}
+echo "<tr>".$str."</tr>";
+
+$str="";
+$i=0;
+foreach ($time as $result) {
+	if( $i == 0 ) 
+		$str = $str."<td><div style=\"float:left;\">0</div><div style=\"float:right;\">".$result."</div></td>";
+	else
+		$str = $str."<td><div style=\"float:right\">".$result."</div></td>";
+	$i++;
+}
+echo "<tr>".$str."</tr></table>";
 
 ?>

buffer/input.txt

@@ -107,7 +107,16 @@ function display_output() {
 
 $_SESSION["algo_num"] = $algo_num;
 
-echo "<br><br>";
+$algo_name;
+if ( $algo_num == 1)
+	$algo_name = "FIRST COME FIRST SERVE";
+else if( $algo_num == 2)
+	$algo_name = "SHORTEST JOB FIRST";
+else if ( $algo_num == 3)
+	$algo_name = "ROUND ROBIN";
+else
+	$algo_name = "PRIORITY SCHEDULING";
+echo "<h2 style=\"text-align:center\">".$algo_name."</h2><br>";
 
 echo "<table id=\"input_tab\">";
 if ( $algo_num == 4 ) {