Use transparency for the fill color

And use random_between() function

modules/FadingRects/FadingRects.cpp

@@ -2,7 +2,6 @@
 #include <cairo/cairo.h>
 #include <libscscreensaver.hpp>
 #include <libsccolor.hpp>
-#include <libscnumerics.hpp>
 #include <vector>
 #include <algorithm>
 
@@ -36,7 +35,7 @@ class FadingRects : public ScreensaverPlugin {
         FadingRects() = default;
         ~FadingRects() = default;
 
-        void setup(cairo_t* context, const cairo_rectangle_t& rect) override;
+        void configure() override;
         int fps() const override;
         void update () override;
         void render() override;
@@ -55,7 +54,7 @@ ScreensaverPlugin* create_instance() {
 }
 
 std::string FadingRects::version() const {
-    return "1.2.0";
+    return "1.2.1";
 }
 
 int FadingRects::fps() const {
@@ -151,8 +150,7 @@ Color FadingRects::next_color() {
     return Color {hsb};
 }
 
-void FadingRects::setup(cairo_t* context, const cairo_rectangle_t& rect) {
+void FadingRects::configure() {
-    ScreensaverPlugin::setup(context, rect);
+    _hue = random_between(0.0, 360.0);
-    _hue = sc::random::double_between(0.0, 360.0);
     _rects.clear();
 }

modules/FadingRects/premake.make

@@ -1,4 +1,4 @@
-LDLIBS := -lcairo -lscscreensaver -lscnumerics -lsccolor
+LDLIBS := -lcairo -lscscreensaver -lsccolor
 UNAME_S := $(shell uname -s)
 PROJ := $(shell basename $$(pwd))
 PLUGIN := $(PROJ).saver

modules/Polygon/Polygon.cpp

@@ -27,9 +27,9 @@ private:
     double _min_speed {0.2};
     double _max_speed {2.0};
     double _stroke_width {1.0};
-    Color _stroke_color {"#FFFFFF"};
+    Color _color {"#FFFFFF"};
-    Color _fill_color {"#606060"};
     std::vector<Point> _points;
+    double _hue;
 };
 
 ScreensaverPlugin *create_instance() { return new Polygon; }
@@ -39,8 +39,6 @@ void Polygon::configure() {
     _min_speed = _j["min-speed"];
     _max_speed = _j["max-speed"];
     _stroke_width = _j["stroke-width"];
-    _stroke_color = _j["stroke-color"];
-    _fill_color = _j["fill-color"];
     for (int i = 0; i < _num_points; ++i) {
         Point p;
         p.x = random_x();
@@ -51,6 +49,7 @@ void Polygon::configure() {
         p.speed_y *= random_bool() ? 1 : -1;
         _points.push_back(p);
     }
+    _hue = random_between(0.0, 360.0);
 }
 
 void Polygon::size_changed() {
@@ -60,9 +59,10 @@ void Polygon::size_changed() {
     }
 }
 
-std::string Polygon::version() const { return "1.0.0"; }
+std::string Polygon::version() const { return "1.1.0"; }
 
 void Polygon::update() {
+    // update points
     for (Point& p : _points) {
         p.x += p.speed_x;
         if (p.x < 0 || p.x > _r.width) {
@@ -75,6 +75,17 @@ void Polygon::update() {
             p.y += p.speed_y;
         }
     }
+    // update hue
+    _hue += 0.5;
+    if (_hue >= 360.0) {
+        _hue -= 360.0;
+    }
+    // construct color
+    HSB hsb;
+    hsb.h = _hue;
+    hsb.s = 1.0;
+    hsb.b = 0.7;
+    _color = hsb;
 }
 
 void Polygon::render() {
@@ -87,11 +98,10 @@ void Polygon::render() {
         cairo_line_to(_c, p.x, p.y);
     }
     cairo_close_path(_c);
-    RGB c = RGB(_stroke_color);
+    RGB c = RGB(_color);
     cairo_set_source_rgb(_c, c.r, c.g, c.b);
     cairo_set_line_width(_c, _stroke_width);
     cairo_stroke_preserve(_c);
-    RGB f = RGB(_fill_color);
+    cairo_set_source_rgba(_c, c.r, c.g, c.b, 0.2);
-    cairo_set_source_rgb(_c, f.r, f.g, f.b);
     cairo_fill(_c);
 }

modules/Polygon/Polygon.json

@@ -1,8 +1,6 @@
 {
-    "num-points": 7,
+    "num-points": 11,
     "min-speed": 0.2,
     "max-speed": 2.0,
-    "stroke-width": 3.0,
+    "stroke-width": 2.0
-    "stroke-color": "#00D000",
-    "fill-color": "#006000"
 }

src/main.cpp

@@ -42,7 +42,6 @@ void print_help() {
 
 void list_plugins() {
     for (const auto& elem : sc::plugin<ScreensaverPlugin>::all()) {
-
         std::cout << elem.first << " (" << elem.second()->version() << ")\n";
     }
 }