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
|
#include <raylib.h>
#include <android/log.h>
#include <vector>
#include <cmath>
#define LOG_TAG "raydemo_particles"
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)
struct Particle {
Vector2 position;
Vector2 velocity;
Color color;
float size;
float life;
};
int main(int argc, char** argv) {
InitWindow(0, 0, "Raylib Particles");
SetTargetFPS(60);
LOGD("raylib particles starting!");
std::vector<Particle> particles;
while (!WindowShouldClose()) {
// Update
bool inputActive = IsMouseButtonDown(MOUSE_BUTTON_LEFT) || GetTouchPointCount() > 0;
Vector2 pos;
if (inputActive) {
pos = GetMousePosition();
if (GetTouchPointCount() > 0) pos = GetTouchPosition(0);
} else {
// Auto emit when idle
double time = GetTime();
pos.x = GetScreenWidth() / 2.0f + cos(time * 3.0f) * (GetScreenWidth() / 4.0f);
pos.y = GetScreenHeight() / 2.0f + sin(time * 2.0f) * (GetScreenHeight() / 4.0f);
}
if (inputActive || GetRandomValue(0, 100) < 50) {
int count = inputActive ? 5 : 2;
for (int i = 0; i < count; i++) {
Particle p;
p.position = pos;
p.velocity = {(float)GetRandomValue(-200, 200) / 100.0f, (float)GetRandomValue(-200, 200) / 100.0f};
p.color = (Color){(unsigned char)GetRandomValue(0, 255), (unsigned char)GetRandomValue(0, 255), (unsigned char)GetRandomValue(0, 255), 255};
p.size = (float)GetRandomValue(5, 20);
p.life = 1.0f;
particles.push_back(p);
}
}
for (auto it = particles.begin(); it != particles.end();) {
it->position.x += it->velocity.x * 5.0f;
it->position.y += it->velocity.y * 5.0f;
it->life -= 0.02f;
it->size *= 0.99f;
if (it->life <= 0) {
it = particles.erase(it);
} else {
++it;
}
}
// Draw
BeginDrawing();
ClearBackground(BLACK);
for (const auto& p : particles) {
DrawCircleV(p.position, p.size, Fade(p.color, p.life));
}
// Draw FPS
const char* fpsText = TextFormat("%2i FPS", GetFPS());
int fpsWidth = MeasureText(fpsText, 40);
DrawText(fpsText, GetScreenWidth() / 2 - fpsWidth / 2, 30, 40, GREEN);
// Draw centered instructions
int fontSize = 40;
const char* text = "Touch to create particles!";
int textWidth = MeasureText(text, fontSize);
DrawText(text, GetScreenWidth() / 2 - textWidth / 2, 80, fontSize, WHITE);
EndDrawing();
}
CloseWindow();
return 0;
}
|
