note 60410 deleted from ref.image by cmb
| From: | cmb@php.net | Date: | Thu, 13 Oct 2016 17:35:37 +0000 |
| Subject: | note 60410 deleted from ref.image by cmb | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-206887@lists.php.net to get a copy of this message | ||
Note Submitter: peter dot hulstaert at gmail dot com
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While I was searching for a good way to draw a graph, I stumbled on skumar2k15's script.
I have taken the liberty to improve multiple aspects of it.
1. The array can grow and shrink in size, the graph will adjust accordingly.
2. All the values in the array are recalculated so they won't get bigger than the height of the
graph.
3. I inserted the possibility to keep a percentage off the height away from the edge.
4. You can adjust the size of the grid.
5. Everything will adjust when you change the height of width.
<?
header("Content-type: image/png");
// Define variables
$Values=array(50,90,30,155,50,40,320,50,40,86,240,128,650,540,320);
$imgWidth=500;
$imgHeight=200;
$grid=25;
$graphspacing=0.05;
//Creation of new array with hight adjusted values
while (list($key, $val) = each($Values))
{if($val>$max){$max=$val;}}
for ($i=0; $i<count($Values); $i++){
$graphValues[$i] = $Values[$i] * (($imgHeight*(1-$graphspacing))/$max);
}
// Create image and define colors
$image=imagecreate($imgWidth, $imgHeight);
$colorWhite=imagecolorallocate($image, 255, 255, 255);
$colorGrey=imagecolorallocate($image, 192, 192, 192);
$colorBlue=imagecolorallocate($image, 0, 0, 255);
// Create border around image
imageline($image, 0, 0, 0, $imgHeight, $colorGrey);
imageline($image, 0, 0, $imgWidth, 0, $colorGrey);
imageline($image, $imgWidth-1, 0, $imgWidth-1, $imgHeight-1, $colorGrey);
imageline($image, 0, $imgHeight-1, $imgWidth-1, $imgHeight-1, $colorGrey);
// Create grid
for ($i=1; $i<($imgWidth/$grid); $i++)
{imageline($image, $i*$grid, 0, $i*$grid, $imgHeight, $colorGrey);}
for ($i=1; $i<($imgHeight/$grid); $i++)
{imageline($image, 0, $i*$grid, $imgWidth, $i*$grid, $colorGrey);}
// Create line graph
if($imgWidth/$grid>count($graphValues)){$space=$grid;}
else{$space = $imgWidth/(count($graphValues)-1);}
for ($i=0; $i<count($graphValues)-1; $i++)
{imageline($image, $i*$space, ($imgHeight-$graphValues[$i]), ($i+1)*$space,
($imgHeight-$graphValues[$i+1]), $colorBlue);}
// Output graph and clear image from memory
imagepng($image);
imagedestroy($image);
?>