Initial Commit

1 files changed, 82 insertions, 0 deletions

diff --git a/src/main.zig b/src/main.zig
new file mode 100644
index 0000000..f021181
--- /dev/null
+++ b/src/main.zig
@@ -0,0 +1,82 @@
+const std = @import("std");
+const rl = @import("raylib");
+var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+
+const particle = struct {
+    color: rl.Color,
+    attrs: particleAttrs,
+    x: i32,
+    y: i32,
+    xvel: i32,
+    yvel: i32,
+};
+
+const particleAttrs = struct {};
+const screenWidth = 1920;
+const screenHeight = 1080;
+
+pub fn main() !void {
+    rl.initWindow(screenWidth, screenHeight, "Particle Simulator");
+    defer rl.closeWindow();
+
+    rl.setTargetFPS(60);
+
+    var particles = try initParticles(200);
+    defer particles.deinit();
+    defer {
+        switch (gpa.deinit()) {
+            std.heap.Check.leak => std.debug.print("\n\nLEAKS!!!!\n\n", .{}),
+            std.heap.Check.ok => std.debug.print("No leaks :3", .{}),
+        }
+    }
+    std.debug.print("{}\n", .{particles.items.len});
+
+    while (!rl.windowShouldClose()) {
+        rl.beginDrawing();
+        if (rl.isKeyPressed(rl.KeyboardKey.key_q)) break;
+
+        defer rl.endDrawing();
+
+        for (0..particles.items.len) |i| {
+            updateParticle(&particles.items[i]);
+            drawParticle(particles.items[i]);
+        }
+
+        rl.clearBackground(rl.Color.white);
+    }
+}
+
+inline fn drawParticle(p: particle) void {
+    rl.drawCircle(p.x, p.y, 1, p.color);
+}
+
+fn updateParticle(p: *particle) void {
+    p.x = @mod((p.x + p.xvel), screenWidth);
+    p.y = @mod((p.y + p.yvel), screenHeight);
+}
+
+fn createParticle(x: i32, y: i32, color: rl.Color, attrs: particleAttrs) particle {
+    return particle{
+        .color = color,
+        .attrs = attrs,
+        .x = x,
+        .y = y,
+        .xvel = 5,
+        .yvel = -7,
+    };
+}
+
+fn initParticles(amnt: u32) !std.ArrayList(particle) {
+    const colors = [_]rl.Color{ rl.Color.red, rl.Color.blue, rl.Color.green };
+    const seed = @as(u64, @truncate(@as(u128, @bitCast(std.time.nanoTimestamp()))));
+    var prng = std.rand.DefaultPrng.init(seed);
+
+    var particles = std.ArrayList(particle).init(gpa.allocator());
+    for (0..amnt) |_| {
+        const x = prng.random().uintLessThan(u32, screenWidth);
+        const y = prng.random().uintLessThan(u32, screenHeight);
+        const color = colors[prng.random().uintLessThan(u32, 3)];
+        try particles.append(createParticle(@intCast(x), @intCast(y), color, .{}));
+    }
+    return particles;
+}