diff --git a/pom.xml b/pom.xml
index cea53df..7ac9953 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
-    <groupId>com.funnyboyroks</groupId>
+    <groupId>com.github.funnyboy-roks</groupId>
     <artifactId>DrawLib</artifactId>
     <version>1.1.0-SNAPSHOT</version>
     <packaging>jar</packaging>
@@ -54,8 +54,8 @@
 
     <distributionManagement>
         <repository>
-            <id>funnyboy_roks</id>
-            <url>https://maven.funnyboyroks.com/snapshots</url>
+            <id>jitpack.io</id>
+            <url>https://jitpack.io</url>
         </repository>
     </distributionManagement>
 
diff --git a/src/main/java/com/funnyboyroks/drawlib/renderer/ShapeRenderer.java b/src/main/java/com/funnyboyroks/drawlib/renderer/ShapeRenderer.java
index 87a7384..a523fc7 100644
--- a/src/main/java/com/funnyboyroks/drawlib/renderer/ShapeRenderer.java
+++ b/src/main/java/com/funnyboyroks/drawlib/renderer/ShapeRenderer.java
@@ -136,12 +136,14 @@ public void drawLine(@NotNull Location a, @NotNull Location b) {
         final double lengthOfStartOptimize = lengthOfTerm * 2 + lengthOfMinMiddle;
         // |<--------------------------------- length ------------------------------------>|
         // |  term  |                          middle                             |  term  |
-        // ********** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * **********
+        // ************ * * * * *  *  *  *   *   *   *   *   *  *  *  * * * * * ************
         if (this.optimize && length >= lengthOfStartOptimize) {
             final double ppb = 1.0 / step_size; // points per block
             final int term = (int)(lengthOfTerm * ppb); // number of terminal points
             final int middle = (int)(lengthOfMinMiddle * ppb); // number of middle points
             final int max = term * 2 + middle; // max points on line
+            final double lengthOfMiddle = length - lengthOfTerm * 2;
+            final double gamma = 2.2;
             for (int i = 0; i <= max; i++) {
                 double mag;  // 0.0 ~ 1.0
                 if (i >= term + middle) {
@@ -149,7 +151,13 @@ public void drawLine(@NotNull Location a, @NotNull Location b) {
                 } else if (i < term) {
                     mag = ((double) i / term) * lengthOfTerm / length;
                 } else {
-                    mag = (lengthOfTerm + ((double)(i - term) / middle) * (length - lengthOfTerm * 2)) / length;
+                    double percent = (double)(i - term) / middle; // 0.0 ~ 1.0
+                    if (percent < 0.5) {
+                        percent = Math.pow(percent * 2, gamma) / 2;
+                    } else {
+                        percent = 1.0 - Math.pow((1.0 - percent) * 2, gamma) / 2;
+                    }
+                    mag = (lengthOfTerm + percent * lengthOfMiddle) / length;
                 }
                 Location l = vec.clone().mult(mag).toLocation(a.getWorld());
                 l.add(a);