diff --git a/src/ScreensaverPlugin.cpp b/src/ScreensaverPlugin.cpp
index 3b6ad4b..4b17fe9 100644
--- a/src/ScreensaverPlugin.cpp
+++ b/src/ScreensaverPlugin.cpp
@@ -25,27 +25,33 @@ void ScreensaverPlugin::make_black() {
 }
 
 cairo_rectangle_t ScreensaverPlugin::random_rect() {
-    cairo_rectangle_t rect;
+    return random_rect_in_rect(_r);
+}
+
+cairo_rectangle_t ScreensaverPlugin::random_rect_in_rect(const cairo_rectangle_t& rect) {
+    cairo_rectangle_t r;
+    std::uniform_real_distribution<double> dx {rect.x, rect.width};
+    std::uniform_real_distribution<double> dy {rect.y, rect.height};
     double v1, v2;
-    v1 = random_x();
-    v2 = random_x();
+    v1 = dx(_eng);
+    v2 = dx(_eng);
     if (v1 < v2) {
-        rect.x = v1;
-        rect.width = v2 - v1;
+        r.x = v1;
+        r.width = v2 - v1;
     } else {
-        rect.x = v2;
-        rect.width = v1 - v2;
+        r.x = v2;
+        r.width = v1 - v2;
     }
-    v1 = random_y();
-    v2 = random_y();
+    v1 = dy(_eng);
+    v2 = dy(_eng);
     if (v1 < v2) {
-        rect.y = v1;
-        rect.height = v2 - v1;
+        r.y = v1;
+        r.height = v2 - v1;
     } else {
-        rect.y = v2;
-        rect.height = v1 - v2;
+        r.y = v2;
+        r.height = v1 - v2;
     }
-    return rect;
+    return r;
 }
 
 double ScreensaverPlugin::random_x() {
@@ -62,3 +68,8 @@ double ScreensaverPlugin::random01() {
     std::uniform_real_distribution<double> dist {};
     return dist(_eng);
 }
+
+double ScreensaverPlugin::random_between(double v1, double v2) {
+    std::uniform_real_distribution<double> dist {v1, v2};
+    return dist(_eng);
+}
diff --git a/src/ScreensaverPlugin.hpp b/src/ScreensaverPlugin.hpp
index 8f77403..84a67ee 100644
--- a/src/ScreensaverPlugin.hpp
+++ b/src/ScreensaverPlugin.hpp
@@ -31,9 +31,11 @@ class ScreensaverPlugin {
 
         void make_black();
         cairo_rectangle_t random_rect();
+        cairo_rectangle_t random_rect_in_rect(const cairo_rectangle_t& rect);
         double random_x();
         double random_y();
         double random01();
+        double random_between(double v1, double v2);
 };
 
 #endif // _ScreensaverPlugin_H_