Add files via upload

Author: TimGoTheCreator

videos/three-body-stars.cpp

@@ -0,0 +1,82 @@
+#include "conf.h"
+#include "raylib.h"
+#include <vector>
+#include <string>
+
+int main() {
+    InitWindow(800, 600, "SemiEuler");
+    std::vector<Particle> particles;
+    particles.emplace_back(-5e10, 0, 0, 15000, 2e30, 7e8, "StarA");
+    particles.emplace_back(5e10, 0, 0, -15000, 2e30, 7e8, "StarB");
+    particles.emplace_back(0, 5e10, -7500, 0, 2e30, 7e7, "StarC");
+
+
+    SetTargetFPS(0); // Unlock FPS
+
+    double dt = 0.4;
+    double camX = 0.0;
+    double camY = 0.0;
+    double simTime = 0.0;
+    double scale = 1.5e6;
+    int steps = 10000;
+    double camSpeed = 5000000;
+    bool paused = false;
+
+    while (!WindowShouldClose()) {
+        if (IsKeyDown(KEY_W)) camY -= camSpeed;
+        if (IsKeyDown(KEY_S)) camY += camSpeed;
+        if (IsKeyDown(KEY_A)) camX -= camSpeed;
+        if (IsKeyDown(KEY_D)) camX += camSpeed;
+        if (IsKeyDown(KEY_UP)) scale *= 1.005;
+
+        if (IsKeyDown(KEY_DOWN)) scale /= 1.005;
+                if (IsKeyPressed(KEY_SPACE)) {
+            paused = !paused;
+        }
+
+        // If its unpaused, run the loop, otherwise, dont.
+        if(!paused) {
+        for (int s = 0; s < steps; s++) {
+            for (size_t i = 0; i < particles.size(); i++) {
+                for (size_t j = i + 1; j < particles.size(); j++) {
+                    Gravity(particles[i], particles[j], dt);
+                }
+            }
+
+            for (auto& p : particles) {
+                p.x += p.vx * dt;
+                p.y += p.vy * dt;
+            }
+
+            simTime += dt;
+        }
+        }
+
+        // Draw particles
+        BeginDrawing();
+        ClearBackground(BLACK);
+        for (auto& p : particles) {
+
+            int radius = (int)(p.r / scale);
+            if (radius < 1) radius = 1;
+
+            Color color = WHITE;
+            if (p.name == "StarA") color = BLUE; // if particle name "Earth" set color blue
+            else if (p.name == "StarB") color = YELLOW; // if particle name "Sun" set color yellow
+            else if (p.name == "StarC") color = PURPLE; // if particle name "Moon" set color gray
+
+            DrawCircle(
+                (int)((p.x - camX) / scale) + 400,
+                (int)((p.y - camY) / scale) + 300,
+                radius,
+                color
+            );
+        }
+
+        if (paused) {
+            DrawText("PAUSED", 10, 10, 20, WHITE);
+        }
+
+        EndDrawing();
+    }
+}