Make it possible to set a minimum circle width

refs #4190

modules/monitoring/application/controllers/TimelineController.php

@@ -16,6 +16,7 @@ class Monitoring_TimelineController extends ActionController
 {
     public function indexAction()
     {
+        // TODO: filter for hard_states (precedence adjustments necessary!)
         $this->setupIntervalBox();
         list($displayRange, $forecastRange) = $this->buildTimeRanges();
 
@@ -62,6 +63,7 @@ class Monitoring_TimelineController extends ActionController
             )
         );
         $timeline->setMaximumCircleWidth('6em');
+        $timeline->setMinimumCircleWidth('0.15em');
         $timeline->setDisplayRange($displayRange);
         $timeline->setForecastRange($forecastRange);
         $timeline->setSession($this->getWindowSession('timeline'));

modules/monitoring/library/Monitoring/Timeline/TimeLine.php

@@ -81,6 +81,13 @@ class TimeLine implements IteratorAggregate
      */
     protected $circleDiameter = 100.0;
 
+    /**
+     * The minimum diameter each circle can have
+     *
+     * @var float
+     */
+    protected $minCircleDiameter = 1.0;
+
     /**
      * The unit of a circle's diameter
      *
@@ -154,14 +161,35 @@ class TimeLine implements IteratorAggregate
     public function setMaximumCircleWidth($width)
     {
         $matches = array();
-        if (preg_match('#([\d]+)([a-z]+|%)#', $width, $matches)) {
+        if (preg_match('#([\d|\.]+)([a-z]+|%)#', $width, $matches)) {
-            $this->circleDiameter = intval($matches[1]);
+            $this->circleDiameter = floatval($matches[1]);
             $this->diameterUnit = $matches[2];
         } else {
             throw new Exception('Width "' . $width . '" is not a valid width');
         }
     }
 
+    /**
+     * Set the minimum diameter each circle can have
+     *
+     * @param   string      $width      The diameter to set, suffixed with its unit
+     *
+     * @throws  Exception               If the given diameter is invalid or its unit differs from the maximum
+     */
+    public function setMinimumCircleWidth($width)
+    {
+        $matches = array();
+        if (preg_match('#([\d|\.]+)([a-z]+|%)#', $width, $matches)) {
+            if ($matches[2] === $this->diameterUnit) {
+                $this->minCircleDiameter = floatval($matches[1]);
+            } else {
+                throw new Exception('Unit needs to be in "' . $this->diameterUnit . '"');
+            }
+        } else {
+            throw new Exception('Width "' . $width . '" is not a valid width');
+        }
+    }
+
     /**
      * Return all known group types (identifiers) with their respective labels and colors as array
      *
@@ -190,7 +218,12 @@ class TimeLine implements IteratorAggregate
     {
         $base = $this->getCalculationBase(true);
         $factor = log($group->getValue() * $group->getWeight(), $base) / 100;
-        return sprintf('%.' . $precision . 'F%s', $this->circleDiameter * $factor, $this->diameterUnit);
+        $width = $this->circleDiameter * $factor;
+        return sprintf(
+            '%.' . $precision . 'F%s',
+            $width > $this->minCircleDiameter ? $width : $this->minCircleDiameter,
+            $this->diameterUnit
+        );
     }
 
     /**