Color Change on value threshold

chuck lidderdale — Sun, 25 Jan 2026 17:13:00 -0000

"misc" will be 00000 heat off, 00001 heat on. Plot create needs $plot>SetDrawBrokenLines(TRUE);
which allows for the line to "------- -----------" where data[8] thru data[14] is NULL. (an aside)

For testing because it's 4 deg outside right now I used $data[$n] to make it work.

In the mysql while fetch_row

if ($n > 100 && $n < 200)
{
$data[] = array($h, $row[2], $row[3], $s, $row[5], $row[6], 32, $row[2]);
} else {
$data[] = array($h, $row[2], $row[3], $s, $row[5], $row[6], 32, NULL);
}

and $plot->SetDataColors(array( 'DarkGreen', 'blue', 'brown', 'YellowGreen', '#aaaaaa', 'black', 'green', 'red'));
and my graph is:
gggggggggggggggggggggrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggg gggggggggggggg
the blank part is where I updated the temp to NULL.

and Who's on First

php 8.0.2

Afan Ottenheimer — Wed, 10 Nov 2021 22:30:05 -0000

Hi - I've moved PHPLOT development to https://github.com/ajRepo/phplot .

Can you open support requests there instead?

php 8.0.2

Michael Keusch — Tue, 09 Nov 2021 13:26:48 -0000

Hello,
support phplot release-6.2.0 PHP8?
Currently I am using release-6.2.0 with PHP7.4.
Thank you very much for your efforts.
Greetings Michael

includes or requires break image?

Afan Ottenheimer — Fri, 04 Jun 2021 13:58:52 -0000

If you get the "image contains errors" error on your browser, it usually means there is text in what's returned in addition to the binary data that defines the image. So perhaps your dbc.php has some HTML header information that it is returning or the like. To tell - look at the raw data being returned for the image and see.

Also - I've moved development to git via github ( https://github.com/AJRepo/PHPlot/ ) from Sourceforge.

includes or requires break image?

atn — Fri, 04 Jun 2021 05:11:14 -0000

every other php file on my site uses:

include dbc.php;

WHY does this break phplot? i have to get the actual sql connection line out of this file and put it in my graph.php manually, or i get the "image contains errors" every time.

what am i doing wrong here?

php 8.0.2

Ted Lorenz — Sat, 20 Feb 2021 19:17:46 -0000

I checked the php.ini file and the extension gd was commented out. Changed it and restarted and my graphs are now working. I would never have thought of that.

Thanks for the help!

php 8.0.2

Afan Ottenheimer — Sat, 20 Feb 2021 04:15:16 -0000

Is gd installed?

php 8.0.2

Ted Lorenz — Fri, 19 Feb 2021 23:38:35 -0000

I just updated xampp to the latest version which include PHP 8.0.2. When I tried to run my line graph i didn't get the graph. When I tried it in a command line I got the following error below. I reloaded xampp that has php 7 and reissued the same command line the output.png was perfect.

I'm not sure why the failure. Has anyone encountered this problem and is there a work around or fix?

Thanks

C:\xampp\htdocs\TS2>php myscript.php > output.png
PHP Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($function) must be a valid callback, function "imagecreate" not found or invalid function name in C:\xampp\htdocs\TS2\phplot-6.2.0\phplot.php:684
Stack trace:

0 C:\xampp\htdocs\TS2\phplot-6.2.0\phplot.php(659): PHPlot->initialize('imagecreate', 800, 600, NULL, NULL)

1 C:\xampp\htdocs\TS2\myscript.php(16): PHPlot->__construct(800, 600)

2

thrown in C:\xampp\htdocs\TS2\phplot-6.2.0\phplot.php on line 684

RasPi data/nodata

chuck lidderdale — Mon, 04 May 2020 13:19:35 -0000

Problem solved - seems the latested RasPi Buster comes with Mysql pre-installed and when you do the LAMP install as seen on the the web - FUBAR!.

RasPi data/nodata

chuck lidderdale — Sat, 02 May 2020 15:53:02 -0000

Pre: a curl script collect information on my heating/cooling system and inserts into a mysql DB.

A Phplot web script on a Fedora box runs fine. Copied to a new Raspberry Pi - when run as a web app says "DrawGraph(): No data array". But if I run from the cmd line "php furnace.php > furn.png" and then http localhost/furn.png I get a perfect graph. Testing indicates that $data doesen't grow under apache. phpinfo() GD look the same as the Fedora box.

include phplot.php
mysql_connect
select a, b, c, d from furnace ( about 1100 data rows )
while ($a2 = mysqli_fetch_row
$data[] = $a2;

$plot = new...
$plot->SetDataValues($data);
$plot->DrawGraph();

Am I missing something in apache config? Thanks for any help.

Recent posts to Discussion

Color Change on value threshold

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includes or requires break image?

includes or requires break image?

php 8.0.2

php 8.0.2

php 8.0.2

0 C:\xampp\htdocs\TS2\phplot-6.2.0\phplot.php(659): PHPlot->initialize('imagecreate', 800, 600, NULL, NULL)

1 C:\xampp\htdocs\TS2\myscript.php(16): PHPlot->__construct(800, 600)

2

RasPi data/nodata

RasPi data/nodata