diff --git a/.idea/misc.xml b/.idea/misc.xml
index 37a7509..7bfef59 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/visualizer/src/main/java/io/github/jeffshee/visualizer/painters/modifier/Rotate.kt b/visualizer/src/main/java/io/github/jeffshee/visualizer/painters/modifier/Rotate.kt
index 3f826f3..8b1cb75 100644
--- a/visualizer/src/main/java/io/github/jeffshee/visualizer/painters/modifier/Rotate.kt
+++ b/visualizer/src/main/java/io/github/jeffshee/visualizer/painters/modifier/Rotate.kt
@@ -9,22 +9,24 @@ class Rotate : Painter {
     var xR: Float
     var yR: Float
     var rpm: Float
+    var offset: Float
 
-    constructor(painters: List<Painter>, xR: Float = .5f, yR: Float = .5f, rpm: Float = 1f) {
+    constructor(painters: List<Painter>, xR: Float = .5f, yR: Float = .5f, rpm: Float = 1f, offset: Float = 0f) {
         this.painters = painters
         this.xR = xR
         this.yR = yR
         this.rpm = rpm
+        this.offset = offset
     }
 
-    constructor(painter: Painter, xR: Float = .5f, yR: Float = .5f, rpm: Float = 1f) : this(
-        listOf(painter), xR, yR, rpm
+    constructor(painter: Painter, xR: Float = .5f, yR: Float = .5f, rpm: Float = 1f, offset: Float = 0f) : this(
+        listOf(painter), xR, yR, rpm, offset
     )
 
     private var rot: Float = 0f
 
     override fun draw(canvas: Canvas, helper: VisualizerHelper) {
-        rotateHelper(canvas, rot, xR, yR) {
+        rotateHelper(canvas, rot + offset, xR, yR) {
             painters.forEach { painter ->
                 painter.draw(canvas, helper)
             }