Merge branch 'master' of https://github.com/michalkop93/c3 into michalkop93-master

bower.json

@@ -4,7 +4,7 @@
     "c3.css",
     "c3.js"
   ],
-  "version": "0.2.4",
+  "version": "0.2.5",
   "homepage": "https://github.com/masayuki0812/c3",
   "authors": [
     "Masayuki Tanaka <masayuki0812@mac.com>"

c3.js

@@ -4,7 +4,7 @@
     /*global define, module, exports, require */
 
     var c3 = {
-        version: "0.2.4"
+        version: "0.2.5"
     };
 
     var CLASS = {
@@ -1250,6 +1250,12 @@
             if (yTargets.length === 0) { // use current domain if target of axisId is none
                 return axisId === 'y2' ? y2.domain() : y.domain();
             }
+            if (isNaN(yDomainMin)) { // set minimum to zero when not number
+                yDomainMin = 0;
+            }
+            if (isNaN(yDomainMax)) { // set maximum to have same value as yDomainMin
+                yDomainMax = yDomainMin;
+            }
             if (yDomainMin === yDomainMax) {
                 yDomainMin < 0 ? yDomainMax = 0 : yDomainMin = 0;
             }
@@ -2063,7 +2069,7 @@
                 if (tooltipRight > chartRight) {
                     tooltipLeft -= tooltipRight - chartRight;
                 }
-                if (tooltipTop + tHeight > getCurrentHeight()) {
+                if (tooltipTop + tHeight > getCurrentHeight() && tooltipTop > tHeight + 30) {
                     tooltipTop -= tHeight + 30;
                 }
             }

component.json

@@ -2,7 +2,7 @@
   "name": "c3",
   "repo": "masayuki0812/c3",
   "description": "A D3-based reusable chart library",
-  "version": "0.2.4",
+  "version": "0.2.5",
   "keywords": [],
   "dependencies": {
     "mbostock/d3": "*"

package.json

 {
   "name": "c3",
-  "version": "0.2.4",
+  "version": "0.2.5",
   "description": "D3-based reusable chart library",
   "main": "c3.js",
   "scripts": {