Lab2/main.cpp at main · chumarena/Lab2 · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
#include "Draw.cpp"


int main(int argc, char* argv[]) {

    if (SDL_Init(SDL_INIT_VIDEO) != 0) {
        SDL_Log("Ошибка инициализации SDL: %s", SDL_GetError());
        return 1;
    }


    const int WIDTH = 800;
    const int HEIGHT = 600;
    SDL_Window* window = SDL_CreateWindow("Движение точки с следом",
                                         SDL_WINDOWPOS_CENTERED,
                                         SDL_WINDOWPOS_CENTERED,
                                         WIDTH, HEIGHT,
                                         SDL_WINDOW_SHOWN);

    if (!window) {
        SDL_Log("Ошибка создания окна: %s", SDL_GetError());
        SDL_Quit();
        return 1;
    }

    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1,
                                               SDL_RENDERER_ACCELERATED |
                                               SDL_RENDERER_PRESENTVSYNC);

    if (!renderer) {
        SDL_Log("Ошибка создания рендерера: %s", SDL_GetError());
        SDL_DestroyWindow(window);
        SDL_Quit();
        return 1;
    }


    Vector2D position(WIDTH / 2, HEIGHT / 2);
    Vector2D velocity(0, 0);
     float SPEED = 2.0f;


    std::vector<TrailPoint> trail;
    const Uint32 TRAIL_DELAY = 100;
    Uint32 lastTrailTime = 0;
    const float MAX_RADIUS = 20.0f;
    const int TRAIL_DURATION = 1500;


    bool isMoving = false;


    bool upPressed = false;
    bool downPressed = false;
    bool leftPressed = false;
    bool rightPressed = false;


    bool running = true;
    SDL_Event event;


    while (running) {
        Uint32 currentTime = SDL_GetTicks();


        while (SDL_PollEvent(&event)) {
            if (event.type == SDL_QUIT) {
                running = false;
            } else if (event.type == SDL_KEYDOWN) {
                switch (event.key.keysym.sym) {
                    case SDLK_UP: upPressed = true; break;
                    case SDLK_DOWN: downPressed = true; break;
                    case SDLK_LEFT: leftPressed = true; break;
                    case SDLK_RIGHT: rightPressed = true; break;
                }
            } else if (event.type == SDL_KEYUP) {
                switch (event.key.keysym.sym) {
                    case SDLK_UP: upPressed = false; break;
                    case SDLK_DOWN: downPressed = false; break;
                    case SDLK_LEFT: leftPressed = false; break;
                    case SDLK_RIGHT: rightPressed = false; break;
                }
            }
        }


        velocity = Vector2D(0, 0);
        if (upPressed) velocity += Vector2D(0, -SPEED);
        if (downPressed) velocity += Vector2D(0, SPEED);
        if (leftPressed) velocity += Vector2D(-SPEED, 0);
        if (rightPressed) velocity += Vector2D(SPEED, 0);


        position += velocity;


        position.setPosition(position.getX(), position.getY(), 5.0f, WIDTH - 5.0f, 5.0f, HEIGHT - 5.0f);


        isMoving = !velocity.isZero();


        if (isMoving && currentTime - lastTrailTime > TRAIL_DELAY) { // Добавление нового следа только если точка движется для того чтобы при остановке не появлялись следы
            TrailPoint newPoint;
            newPoint.position = position;
            newPoint.radius = 3.0f;
            newPoint.alpha = 100;
            newPoint.creationTime = currentTime;
            trail.push_back(newPoint);
            lastTrailTime = currentTime;
        }

        // Обновление следов
        for (auto it = trail.begin(); it != trail.end(); ) {
            float age = currentTime - it->creationTime;
            float lifeRatio = age / (float)TRAIL_DURATION;

            if (lifeRatio > 1.0f) {

                it = trail.erase(it);
            } else {

                it->radius = 3.0f + lifeRatio * (MAX_RADIUS - 3.0f);
                it->alpha = 100 - static_cast<Uint8>(lifeRatio * 100);
                ++it;
            }
        }


        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
        SDL_RenderClear(renderer);


        for (const auto& point : trail) {//следы тусклее точки
            drawCircle(renderer,
                      static_cast<int>(point.position.getX()),
                      static_cast<int>(point.position.getY()),
                      static_cast<int>(point.radius),
                      200, 200, 200, point.alpha);
        }


        drawCircle(renderer,
                  static_cast<int>(position.getX()),
                  static_cast<int>(position.getY()),
                  5,
                  255, 255, 255, 255);

        SDL_RenderPresent(renderer);


        SDL_Delay(10);
    }


    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}