Particle amount now updates with slider

2 files changed, 11 insertions, 1 deletions

diff --git a/src/main.zig b/src/main.zig
index 7d859fc..02830e5 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -36,6 +36,16 @@ pub fn main() !void {
     defer particles.deinit(gpa.allocator());
 
     while (!rl.windowShouldClose()) {
+        if (particles.items(.x).len < cfg.particleCount) {
+            for (0..@intCast(cfg.particleCount - @as(i32, @intCast(particles.items(.x).len)))) |_| {
+                try particles.append(gpa.allocator(), part.createParticle());
+            }
+        }
+
+        if (particles.items(.x).len > cfg.particleCount) {
+            particles.shrinkRetainingCapacity(@intCast(cfg.particleCount));
+        }
+
         rl.beginDrawing();
         defer rl.endDrawing();
         if (rl.isKeyPressed(rl.KeyboardKey.key_q)) break;
diff --git a/src/particle.zig b/src/particle.zig
index 05ffb7f..00eace7 100644
--- a/src/particle.zig
+++ b/src/particle.zig
@@ -124,7 +124,7 @@ fn force(distance: f32, attraction: f32) f32 {
     return 0;
 }
 
-fn createParticle() particle {
+pub fn createParticle() particle {
     const seed = @as(u64, @truncate(@as(u128, @bitCast(std.time.nanoTimestamp()))));
     var prng = std.rand.DefaultPrng.init(seed);
     const x = prng.random().uintLessThan(u32, cfg.screenWidth);