Mega Code Archive
Simple bar graph
<![CDATA[
When you want to compare your data among durations, the first choice is graph. This function will create a bar graph by using only tag table. If your data looks like this:
Month 1 Growth 25%
Month 2 Growth 20%
Month 4 Growth 15%
Month 7 Growth 23%
select all data to array:
$dnum[1]=25, $dnum[2]=20, $dnum[4]=15, $dnum[7]=23
and $allmonth=7 that means you have data until 7th month
then send variable to function graph()
<?
$dnum[1]=25;
$dnum[2]=20;
$dnum[4]=15;
$dnum[7]=23;
$allmonth=7;
function graph($allmonth, $dnum) {
$maxdnum=ceil(max($dnum)); //find out the maximal value of array
if ($maxdnum>=50) { $xnum=1; } //set scale of graph to 100%
elseif ($maxdnum>=20) { $xnum=2; } //set scale of graph to 50%
elseif ($maxdnum>=10) { $xnum=5; } //set scale of graph to 20%
elseif ($maxdnum>=5) { $xnum=10; } //set scale of graph to 10%
elseif ($maxdnum>=0) { $xnum=20; } //set scale of graph to 5%
echo "<br><table align=center width=100% border=1>";
echo "<tr bgcolor=cyan align=center><td>Month</td>";
for ($i=1; $i<=100; $i++) { echo "<td></td>"; }
echo "<td>%</td></tr>";
for ($k=1; $k<=$allmonth; $k++) {
if ( !isset($dnum[$k]) ) { $dnum[$k]='NA'; } //set value to missed month
echo "<tr align=center><td>$k</td>";
if ($dnum[$k] !='NA') { $dgraph[$k]=round($dnum[$k]*$xnum);
$rgraph=100-$dgraph[$k]; }
else { $dgraph[$k]=0; $rgraph=100; }
for ($i=1; $i<=$dgraph[$k]; $i++) { echo "<td bgcolor=red></td>"; }
for ($j=1; $j<=$rgraph; $j++) { echo "<td bgcolor=#dedede></td>"; }
echo "<td>$dnum[$k]</td></tr>";
}
echo "</table>";
}
// Usage :
// graph($allmonth,$dnum);
?>
]]>