"Laptop alias", a frequent MySQL forum contributor, posted this example of a bar chart. Run the DDL in a MySQL client program, substitute your values for USR, PWD and DBNAME in the PHP script, then run the script on your web server.
-- DDL
CREATE TABLE my_chart(month INT NOT NULL AUTO_INCREMENT PRIMARY KEY,val INT NOT NULL);
INSERT INTO my_chart (val) values (50),(75),(130),(215),(44),(135),(24),(54),(75),(90),(47),(67);
SELECT * FROM my_chart;
<?php
// PHP SCRIPT
$conn = mysql_connect( "localhost", "USR", "PWD" );
mysql_select_db( "DBNAME" );
$query = "SELECT DATE_FORMAT(CONCAT('2009-',month,'-00'),'%b') month,val FROM my_chart";
$result = mysql_query($query);
$values = array();
while ($row = mysql_fetch_array($result)) {
$values[$row['month']] = $row['val'];
}
$max_value=max($values);
$img_width=450;
$img_height=300;
$margins=20;
# ---- Find the size of graph by substracting the size of borders
$graph_width=$img_width - $margins * 2;
$graph_height=$img_height - $margins * 2;
$img=imagecreate($img_width,$img_height);
$bar_width=20;
$total_bars=count($values);
$gap= ($graph_width- $total_bars * $bar_width ) / ($total_bars +1);
# ------- Define Colors ----------------
$bar_color=imagecolorallocate($img,0,64,128);
$background_color=imagecolorallocate($img,240,240,255);
$border_color=imagecolorallocate($img,200,200,200);
$line_color=imagecolorallocate($img,220,220,220);
# ------ Create the border around the graph ------
imagefilledrectangle($img,1,1,$img_width-2,$img_height-2,$border_color);
imagefilledrectangle($img,$margins,$margins,$img_width-1-$margins,$img_height-1-$margins,$background_color);
# ------- Max value is required to adjust the scale -------
$max_value=max($values);
$ratio= $graph_height/$max_value;
# -------- Create scale and draw horizontal lines --------
$horizontal_lines=20;
$horizontal_gap=$graph_height/$horizontal_lines;
for($i=1;$i<=$horizontal_lines;$i++){
$y=$img_height - $margins - $horizontal_gap * $i ;
imageline($img,$margins,$y,$img_width-$margins,$y,$line_color);
$v=intval($horizontal_gap * $i /$ratio);
imagestring($img,0,5,$y-5,$v,$bar_color);
}
# ----------- Draw the bars here ------
for( $i=0; $i< $total_bars; $i++ ){
# ------ Extract key and value pair from the current pointer position
list($key,$value) = each($values);
$x1 = $margins + $gap + $i * ($gap+$bar_width) ;
$x2 = $x1 + $bar_width;
$y1 =$margins +$graph_height- intval($value * $ratio) ;
$y2 =$img_height-$margins;
imagestring($img,0,$x1+3,$y1-10,$value,$bar_color);
imagestring($img,0,$x1+3,$img_height-15,$key,$bar_color);
imagefilledrectangle($img,$x1,$y1,$x2,$y2,$bar_color);
}
header("Content-type:image/png");
imagepng($img);
?>
|
|