Add module Polygon

modules/Polygon/Polygon.cpp

@@ -0,0 +1,99 @@
+#include "Polygon.hpp"
+#include <cairo/cairo.h>
+#include <libsccolor.hpp>
+#include <libscnumerics.hpp>
+#include <libscscreensaver.hpp>
+#include <vector>
+
+struct Point {
+    double x;
+    double y;
+    double speed_x;
+    double speed_y;
+};
+
+class Polygon : public ScreensaverPlugin {
+public:
+    Polygon() = default;
+    ~Polygon() = 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;
+    std::string version() const override;
+
+private:
+    int _num_points {10};
+    double _min_speed {0.2};
+    double _max_speed {2.0};
+    double _stroke_width {1.0};
+    Color _stroke_color {"#FFFFFF"};
+    Color _fill_color {"#006600"};
+    std::vector<Point> _points;
+};
+
+ScreensaverPlugin *create_instance() { return new Polygon; }
+
+void Polygon::setup(cairo_t* context, const cairo_rectangle_t& rect) {
+    ScreensaverPlugin::setup(context, rect);
+    for (int i = 0; i < _num_points; ++i) {
+        Point p;
+        p.x = sc::random::double_between(0, _r.width);
+        p.y = sc::random::double_between(0, _r.height);
+        p.speed_x = sc::random::double_between(_min_speed, _max_speed);
+        p.speed_x *= sc::random::boolean() ? 1 : -1;
+        p.speed_y = sc::random::double_between(_min_speed, _max_speed);
+        p.speed_y *= sc::random::boolean() ? 1 : -1;
+        _points.push_back(p);
+    }
+}
+
+void Polygon::configure() {
+    _num_points = _j["num-points"];
+    _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"];
+    setup(_c, _r);
+}
+
+std::string Polygon::version() const { return "1.0.0"; }
+
+int Polygon::fps() const { return 30; }
+
+void Polygon::update() {
+    for (Point& p : _points) {
+        p.x += p.speed_x;
+        if (p.x < 0 || p.x > _r.width) {
+            p.speed_x *= -1;
+            p.x += p.speed_x;
+        }
+        p.y += p.speed_y;
+        if (p.y < 0 || p.y > _r.height) {
+            p.speed_y *= -1;
+            p.y += p.speed_y;
+        }
+    }
+}
+
+void Polygon::render() {
+    make_black();
+    Point first = _points[0];
+    cairo_new_path(_c);
+    cairo_move_to(_c, first.x, first.y);
+    for (size_t i = 1; i < _points.size(); ++i) {
+        Point& p = _points[i];
+        cairo_line_to(_c, p.x, p.y);
+    }
+    cairo_close_path(_c);
+    RGB c = RGB(_stroke_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_fill(_c);
+}