set initial window position

jme3-core/src/main/java/com/jme3/system/AppSettings.java

@@ -289,6 +289,7 @@ public final class AppSettings extends HashMap<String, Object> {
         defaults.put("SwapBuffers", true);
         defaults.put("OpenCL", false);
         defaults.put("OpenCLPlatformChooser", DefaultPlatformChooser.class.getName());
+        defaults.put("CenterWindow", true);
         //  defaults.put("Icons", null);
     }
 
@@ -1331,4 +1332,63 @@ public boolean isGraphicsTrace() {
     public void setGraphicsTrace(boolean trace) {
         putBoolean("GraphicsTrace", trace);
     }
+
+    /**
+     * Get the Center Window state
+     *
+     * @return true for center the window in the middle of the screen
+     * @see #setCenterWindow(boolean)
+     */
+    public boolean getCenterWindow() {
+        return getBoolean("CenterWindow");
+    }
+
+    /**
+     * True to enable center the window.
+     *
+     * @param center whether to center the window or not.
+     */
+    public void setCenterWindow(boolean center) {
+        putBoolean("CenterWindow", center);
+    }
+
+
+    /**
+     * Get the position of the window's X Position
+     *
+     * @return int screen coordinates of the X Position of the window
+     * @see #setWindowXPosition(int)
+     */
+    public int getWindowXPosition() {
+        return getInteger("windowXpos");
+    }
+
+    /**
+     * The position of the window's X Position.
+     *
+     * @param pos screen coordinates for the X position.
+     */
+    public void setWindowXPosition(int pos) {
+        putInteger("windowXpos", pos);
+    }
+
+
+    /**
+     * Get the position of the window's Y Position
+     *
+     * @return int screen coordinates of the Y Position of the window
+     * @see #setWindowXPosition(int)
+     */
+    public int getWindowYPosition() {
+        return getInteger("windowYpos");
+    }
+
+    /**
+     * The position of the window's Y Position.
+     *
+     * @param pos screen coordinates for the Y position.
+     */
+    public void setWindowYPosition(int pos) {
+        putInteger("windowYpos", pos);
+    }
 }

jme3-lwjgl3/src/main/java/com/jme3/system/lwjgl/LwjglWindow.java

@@ -274,11 +274,16 @@ public void invoke(final long window, final boolean focus) {
             }
         });
 
-        // Center the window
         if (!settings.isFullscreen()) {
-            glfwSetWindowPos(window,
+            if (settings.getCenterWindow())
+            {
+                // Center the window
+                glfwSetWindowPos(window,
                     (videoMode.width() - settings.getWidth()) / 2,
                     (videoMode.height() - settings.getHeight()) / 2);
+            } else {
+                glfwSetWindowPos(window,settings.getWindowXPosition(), settings.getWindowYPosition());
+            }
         }
 
         // Make the OpenGL context current