Use transparency for the fill color

modules/Polygon/Polygon.cpp

@@ -27,8 +27,7 @@ private:
     double _min_speed {0.2};
     double _max_speed {2.0};
     double _stroke_width {1.0};
-    Color _stroke_color {"#FFFFFF"};
-    Color _fill_color {"#606060"};
+    Color _color {"#FFFFFF"};
     std::vector<Point> _points;
     double _hue;
 };
@@ -81,14 +80,12 @@ void Polygon::update() {
     if (_hue >= 360.0) {
         _hue -= 360.0;
     }
-    // construct stroke and fill colors
+    // construct color
     HSB hsb;
     hsb.h = _hue;
     hsb.s = 1.0;
-    hsb.b = 0.1;
-    _fill_color = hsb;
     hsb.b = 0.7;
-    _stroke_color = hsb;
+    _color = hsb;
 }
 
 void Polygon::render() {
@@ -101,11 +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_rgb(_c, f.r, f.g, f.b);
+    cairo_set_source_rgba(_c, c.r, c.g, c.b, 0.2);
     cairo_fill(_c);
 }

modules/Polygon/Polygon.json

@@ -1,6 +1,6 @@
 {
-    "num-points": 42,
+    "num-points": 11,
     "min-speed": 0.2,
     "max-speed": 2.0,
-    "stroke-width": 3.0
+    "stroke-width": 2.0
 }