Resolved #201 - add scale() function.

src/datasource-zabbix/metricFunctions.js

@@ -30,6 +30,15 @@ addFuncDef({
   defaultParams: ['1m', 'avg'],
 });
 
+addFuncDef({
+  name: 'scale',
+  category: 'Transform',
+  params: [
+    { name: 'factor', type: 'float', options: [100, 0.01, 10, -1]}
+  ],
+  defaultParams: [100],
+});
+
 addFuncDef({
   name: 'sumSeries',
   category: 'Aggregate',
@@ -126,8 +135,16 @@ class FuncInstance {
 
       // Bind function arguments
       var bindedFunc = func;
+      var param;
       for (var i = 0; i < this.params.length; i++) {
-        bindedFunc = _.partial(bindedFunc, this.params[i]);
+        param = this.params[i];
+
+        // Convert numeric params
+        if (this.def.params[i].type === 'int' ||
+            this.def.params[i].type === 'float') {
+          param = Number(param);
+        }
+        bindedFunc = _.partial(bindedFunc, param);
       }
       return bindedFunc;
     } else {
@@ -140,7 +157,10 @@ class FuncInstance {
     var parameters = _.map(this.params, function(value, index) {
 
       var paramType = this.def.params[index].type;
-      if (paramType === 'int' || paramType === 'value_or_series' || paramType === 'boolean') {
+      if (paramType === 'int' ||
+          paramType === 'float' ||
+          paramType === 'value_or_series' ||
+          paramType === 'boolean') {
         return value;
       }
       else if (paramType === 'int_or_interval' && $.isNumeric(value)) {