Performance issue, processor load 100%, when it try to calculate Y side.

Possible set fixed values
Y axis MIN value: 0
Y axis MAX value: -1

And then select "Preview"

There are other issue related to axises and registered recently. Click to "axis" label to find them.
Probably would be good to fix them together.

Another way:
min = 18
max = calculated
graph type = stacked
(works ok when type = normal)

(1) No translatable strings changed.

oleg.egorov CLOSED

RESOLVED in svn://svn.zabbix.com/branches/dev/ZBX-7957

(2) Coding style

if (!($this->ymin_type == GRAPH_YAXIS_TYPE_FIXED && $this->ymax_type == GRAPH_YAXIS_TYPE_CALCULATED)
					&& $this->type == GRAPH_TYPE_STACKED) {

I think better use:

if (($this->ymin_type != GRAPH_YAXIS_TYPE_FIXED || $this->ymax_type != GRAPH_YAXIS_TYPE_CALCULATED)
					&& $this->type == GRAPH_TYPE_STACKED) {

CLineGraphDraw: 810

if ($this->m_maxY[$side] == 0) {
	$this->m_minY[$side] = -1;
}

Why?

iivs Previous lines are as much as important that the ones mentioned. In order to understand these lines, one should look at bigger picture. If YaxisMax is fixed value and it is 0 and if YaxisMin doesn't have a value, or turns out the value is same "0" or even worse YaxisMin is > YaxisMax, then we can draw a graph. Since YaxisMin is marked as "calculated", we need to draw something. In order to draw a graph in this special case we need a default YaxisMin value, so we create a default value for YaxisMin = -1. So here we have YaxisMin = -1 and YaxisMax = 0. Later on in code, we add corrections depending on interval. In the end it corrects to YaxisMin to -1.2 and leaves YaxisMax to 0. So we have a nice "calculated" YaxisMin. The same reason when we make a default value for reverse situation when YaxisMin = 0 and YaxisMax has no value, is also 0 etc and YaxisMax is marked as "calculated". Only there we now give axis positive values from 0 to 1.2. So the code is pretty much self explanatory when giving it a harder look.

As for CLineGraphDraw: 796-797 coding style changed. RESOLVED in r44123

oleg.egorov CLOSED

(3) CLineGraphDraw: 705

if ($min > $max || $min == $max) {

Use bc functions

iivs RESOLVED in r44123

oleg.egorov CLOSED

TESTED

Graph Y axis min/max value validation has been improved. Now, if Y axis min/max contains invalid values, frontend will display error.

Fixed in pre-2.2.4rc1 r44156 and pre-2.3.0 (trunk) r44157