Utility classes and functions for comfortable drawing

src/drawing_assets.cpp

@@ -1,3 +1,4 @@
+#include <varargs.h>
 #include "frame.hpp"
 #include "drawing_assets.hpp"
 

src/drawing_assets.hpp

@@ -1,8 +1,117 @@
 #pragma once
 
+#include <type_traits>
+
 #include "frame.hpp"
 
 void draw_circle(Frame *frame, int cx, int cy, int radius, COLOR outline);
 
+inline void draw_circle(Frame *frame, Point c, int radius, COLOR outline) {
+    draw_circle(frame, c.x, c.y, radius, outline);
+}
+
 void draw_line(Frame *frame, int x1, int y1, int x2, int y2, COLOR color);
 
+inline void draw_line(Frame *frame, Point p1, Point p2, COLOR color) {
+    draw_line(frame, p1.x, p1.y, p2.x, p2.y, color);
+}
+
+template<class ...>
+struct draw_polyline_ {
+    template<class ...point_t>
+    friend
+    void draw_polyline(Frame *frame, COLOR color, point_t ...points);
+
+    template<class ...>
+    friend
+    struct draw_polyline_;
+private:
+};
+
+
+template<class p0_t, class p1_t, class ...pp_t>
+struct draw_polyline_<p0_t, p1_t, pp_t...> {
+    template<class ...point_t>
+    friend
+    void draw_polyline(Frame *frame, COLOR color, point_t ...points);
+
+    template<class ...>
+    friend
+    struct draw_polyline_;
+private:
+    static_assert(std::is_same_v<p0_t, Point>);
+    static_assert(std::is_same_v<p1_t, Point>);
+
+    static void draw(Frame *frame, COLOR color, p0_t p0, p1_t p1, pp_t ...points) {
+        draw_line(frame, p0, p1, color);
+        draw_polyline_<p1_t, pp_t...>::draw(frame, color, p1, points...);
+    }
+
+    static constexpr bool HAS_ANY = true;
+
+    static Point first(p0_t p0, p1_t p1, pp_t ...points) {
+        return p0;
+    }
+
+    static Point last(p0_t p0, p1_t p1, pp_t ...points) {
+        return draw_polyline_<p1_t, pp_t...>::last(p1, points...);
+    }
+};
+
+template<class p0_t>
+struct draw_polyline_<p0_t> {
+    template<class ...point_t>
+    friend
+    void draw_polyline(Frame *frame, COLOR color, point_t ...points);
+
+    template<class ...>
+    friend
+    struct draw_polyline_;
+private:
+    static_assert(std::is_same_v<p0_t, Point>);
+
+    static void draw(Frame *frame, COLOR color, p0_t p0) {}
+
+    static constexpr bool HAS_ANY = true;
+
+
+    static Point first(p0_t p0) {
+        return p0;
+    }
+
+    static Point last(p0_t p0) {
+        return p0;
+    }
+};
+
+template<>
+struct draw_polyline_<> {
+    template<class ...point_t>
+    friend
+    void draw_polyline(Frame *frame, COLOR color, point_t ...points);
+
+    template<class ...>
+    friend
+    struct draw_polyline_;
+private:
+    static void draw(Frame *frame, COLOR color) {}
+
+    static constexpr bool HAS_ANY = false;
+
+    static Point first() {
+        return Point{0, 0};
+    }
+
+    static Point last() {
+        return Point{0, 0};
+    }
+};
+
+template<class ...point_t>
+void draw_polyline(Frame *frame, COLOR color, point_t ...points) {
+    if constexpr (!draw_polyline_<point_t...>::HAS_ANY) {}
+    else {
+        draw_polyline_<point_t...>::draw(frame, color, points...);
+        draw_line(frame, draw_polyline_<point_t...>::last(points...), draw_polyline_<point_t...>::first(points...), color);
+    }
+}

src/frame.hpp

@@ -15,38 +15,60 @@ struct COLOR {
 
 };
 
+class Point {
+public:
+    int x;
+    int y;
+
+    inline Point(int x, int y) : x{x}, y{y} {};
+
+    [[nodiscard]] Point rotated_around(int cx, int cy, double angle_radians) const {
+        return Point{
+                static_cast<int>((this->x - cx) * std::cos(angle_radians) - (this->y - cy) * std::sin(angle_radians) + cx),
+                static_cast<int>((this->x - cx) * std::sin(angle_radians) + (this->y - cy) * std::cos(angle_radians) + cy)
+        };
+    }
+
+    [[nodiscard]] Point rotated_around(Point p, double angle_radians) const {
+        return this->rotated_around(p.x, p.y, angle_radians);
+    }
+
+    [[nodiscard]] Point moved(int dx, int dy) const {
+        return Point{this->x + dx, this->y + dy};
+    }
+};
 
 class Frame {
     COLOR *pixels;
 public:
     const int width, height;
 
-    Frame(int _width, int _height) : width{_width}, height{_height} {
+    inline Frame(int _width, int _height) : width{_width}, height{_height} {
         int size = width * height;
 
         this->pixels = new COLOR[size];
     }
 
 private:
-    [[nodiscard]] COLOR _get_pixel(int x, int y) const {
+    [[nodiscard]]inline COLOR _get_pixel(int x, int y) const {
         return this->pixels[y * this->width + x];
     }
 
-    [[nodiscard]] COLOR &_get_pixel(int x, int y) {
+    [[nodiscard]] inline COLOR &_get_pixel(int x, int y) {
         return this->pixels[y * this->width + x];
     }
 
 public:
-    void set_pixel(int x, int y, COLOR color) {
+    inline void set_pixel(int x, int y, COLOR color) {
         this->_get_pixel(x, y) = color;
     }
 
-    [[nodiscard]] COLOR get_pixel(int x, int y) const {
+    [[nodiscard]] inline COLOR get_pixel(int x, int y) const {
         return this->_get_pixel(x, y);
     }
 
 
-    ~Frame() {
+    inline ~Frame() {
         delete[]this->pixels;
     }
 };

src/painter.cpp

@@ -5,9 +5,8 @@
 
 
 class DemoPainter : public Painter {
-
+public:
     void draw(PainterState *state, Frame *frame) const override {
-
         int W = frame->width, H = frame->height;
         // Размер рисунка возьмём меньше (7 / 8), чтобы он не касался границ экрана
         float a = 7.0f / 8 * ((W < H) ? W - 1 : H - 1) / sqrt(2);
@@ -15,36 +14,19 @@ class DemoPainter : public Painter {
         float angle = state->angle; // Угол поворота
         a = a / 2;
 
-        // Инициализируем исходные координаты центра и вершин квадрата
-        struct {
-            float x;
-            float y;
-        } C = {(float) W / 2, (float) H / 2}, A[4] = {{C.x + a, C.y + a},
-                                                      {C.x + a, C.y - a},
-                                                      {C.x - a, C.y - a},
-                                                      {C.x - a, C.y + a}};
+        Point center{W / 2, H / 2};
 
+        draw_polyline(
+                frame, COLOR{200, 30, 45},
+                center.moved(a, a).rotated_around(center, angle),
+                center.moved(a, -a).rotated_around(center, angle),
+                center.moved(-a, -a).rotated_around(center, angle),
+                center.moved(-a, a).rotated_around(center, angle)
+        );
 
-        // Поворачиваем все вершины квадрата вокруг точки C на угол angle
-        for (int i = 0; i < 4; i++) {
-            float xi = A[i].x, yi = A[i].y;
-            A[i].x = (xi - C.x) * cos(angle) - (yi - C.y) * sin(angle) + C.x;
-            A[i].y = (xi - C.x) * sin(angle) + (yi - C.y) * cos(angle) + C.y;
-        }
-
-        // Рисуем стороны квадрата
-        for (int i = 0; i < 4; i++) {
-            int i2 = (i + 1) % 4;
-            draw_line(
-                    frame,
-                    int(A[i].x + 0.5f),
-                    int(A[i].y + 0.5f),
-                    int(A[i2].x + 0.5f),
-                    int(A[i2].y + 0.5f), COLOR(200, 30, 45));
-        }
 
         // Рисуем описанную окружность
-        draw_circle(frame, (int) C.x, (int) C.y, int(a * sqrt(2) + 0.5f), COLOR(100, 100, 250));
+        draw_circle(frame, center, int(a * sqrt(2) + 0.5f), COLOR(100, 100, 250));
 
         // Рисуем пиксель, на который кликнул пользователь
         if (state->clicked_pixel.x >= 0 && state->clicked_pixel.x < W &&