renamed module directories

modules/FadingRects/FadingRects.cpp

@@ -0,0 +1,158 @@
+//
+// FadingRects.cpp
+// screensaver
+//
+// Created by Bob Polis at 2020-10-26
+// Copyright (c) 2020 SwiftCoder. All rights reserved.
+//
+
+#include "FadingRects.hpp"
+#include <libscscreensaver.hpp>
+#include <string>
+#include <sstream>
+#include <iomanip>
+#include <vector>
+#include <algorithm>
+
+const int default_frames_per_rect {10};
+const int fade_time {5}; // seconds
+
+enum class FadingState {
+    fadein,
+    sustain,
+    fadeout
+};
+
+struct Rect {
+    double x {0};
+    double y {0};
+    double width {0};
+    double height {0};
+    double red {0.0};
+    double green {0.0};
+    double blue {0.0};
+    double alpha {1.0};
+    double cur_alpha {0.0};
+    double delta {0.0};
+    FadingState state {FadingState::fadein};
+    int sustain_frame {0};
+    double line_width {2.0};
+};
+
+class FadingRects : public ScreensaverPlugin {
+    public:
+        FadingRects() = default;
+        ~FadingRects() = default;
+
+        void setup(cairo_t* context, const cairo_rectangle_t& rect) override;
+        int fps() const override;
+        void update () override;
+        void render() override;
+
+    private:
+        double _hue {0.0};
+        std::vector<Rect> _rects;
+        int _frames_per_rect {default_frames_per_rect};
+
+        Color next_color();
+};
+
+ScreensaverPlugin* create_instance() {
+    return new FadingRects;
+}
+
+int FadingRects::fps() const {
+    return 20;
+}
+
+void FadingRects::update() {
+    // adjust rects
+    for (Rect& r : _rects) {
+        switch (r.state) {
+            case FadingState::fadein:
+                r.cur_alpha += r.delta;
+                if (r.cur_alpha > r.alpha) {
+                    r.cur_alpha = r.alpha;
+                    r.state = FadingState::sustain;
+                }
+                break;
+            case FadingState::sustain:
+                r.sustain_frame++;
+                if (r.sustain_frame > fps()) {
+                    r.state = FadingState::fadeout;
+                }
+                break;
+            case FadingState::fadeout:
+                r.cur_alpha -= r.delta;
+                break;
+        }
+    }
+    auto it = std::remove_if(_rects.begin(), _rects.end(), [](const Rect& r) {
+        return r.cur_alpha < 0.0;
+    });
+    _rects.erase(it, _rects.end());
+
+    // add new rect, if allowed
+    _frames_per_rect--;
+    if (_frames_per_rect == 0) {
+        _frames_per_rect = default_frames_per_rect;
+        cairo_rectangle_t rr {_r};
+        rr.x -= 50.0;
+        rr.y -= 50.0;
+        rr.width += 100.0;
+        rr.height += 100.0;
+        rr = random_rect_in_rect(rr);
+        RGB rgb {RGB(next_color())};
+        Rect rect;
+        rect.red = rgb.r;
+        rect.green = rgb.g;
+        rect.blue = rgb.b;
+        rect.alpha = random01();
+        rect.cur_alpha = 0.0;
+        rect.state = FadingState::fadein;
+        rect.sustain_frame = 0;
+        rect.delta = rect.alpha / (fade_time * fps());
+        rect.line_width = random_between(1.0, 20.0);
+        rect.x = rr.x;
+        rect.y = rr.y;
+        rect.width = rr.width;
+        rect.height = rr.height;
+        _rects.push_back(rect);
+    }
+}
+
+void FadingRects::render() {
+    // clear screen
+    make_black();
+
+    // render rects
+    for (Rect r : _rects) {
+        cairo_set_source_rgba(_c, r.red, r.green, r.blue, r.cur_alpha);
+        cairo_rectangle_t rect;
+        rect.x = r.x;
+        rect.y = r.y;
+        rect.width = r.width;
+        rect.height = r.height;
+        rounded_rect(rect, 10.0);
+        cairo_set_line_width(_c, r.line_width);
+        cairo_stroke(_c);
+    }
+}
+
+Color FadingRects::next_color() {
+    _hue += 0.5;
+    if (_hue >= 360.0) {
+        _hue -= 360.0;
+    }
+    HSB hsb;
+    hsb.h = _hue;
+    hsb.s = random01();
+    hsb.b = random01();
+    return Color {hsb};
+}
+
+void FadingRects::setup(cairo_t* context, const cairo_rectangle_t& rect) {
+    ScreensaverPlugin::setup(context, rect);
+    std::uniform_real_distribution<double> dist {0.0, 360.0};
+    _hue = dist(_eng);
+}