sdaf

src/main.zig

@@ -3,17 +3,64 @@ const rl = @import("raylib");
 const rg = @import("raygui");
 const pr = @import("primitives.zig");
 
-const Particle = struct{
+var prng = std.rand.DefaultPrng.init(124346556);
+
+
+const rand = prng.random();
+
+fn randMinMaxFloat(min:f32,max:f32) f32 {
+    var r1 = rand.float(f32);
+    r1 = 2*(r1 - 0.5);//-0.5..0.5
+    return (@abs(min)+@abs(max))/2 * r1;
+}
+
+test "random" {
+    var seed:u64 = undefined;
+    var r1 :f32 = undefined;
+    try std.posix.getrandom(std.mem.asBytes(&seed));
+
+    prng = std.rand.DefaultPrng.init(seed);
+    while(true) {
+        r1 = randMinMaxFloat(-10,10);
+        //std.debug.print("randMinMaxFloat:{}\n",.{r1});
+        if (r1 > 8 or r1 < -8 ) {
+            std.debug.print("Greater:{}\n",.{r1});
+        }
+    }
+}
+
+const Particle = struct {
     const Self = @This();
     position : pr.Vec = .{.a = .{.x=0,.y=0,.z=0}},
     velocity : pr.Vec = .{.a = .{.x=0,.y=0,.z=0}},
     acceleration : pr.Vec = .{.a = .{.x=0,.y=0,.z=0}},
-    pub fn new(self:Self)void{
+    lifespan : u8 = 0,
+    pub fn new(self:Self) void {
         _ = self;
     }
-    pub fn update(self:Self)void{
-        self.velocity = self.velocity + self.acceleration;
-        self.position = self.position + self.velocity;
+    pub fn update(self:*Self) void {
+        self.velocity.add(self.acceleration);
+        self.position.add(self.velocity);
+
+        if (self.lifespan > 0) {
+            self.lifespan -= 1;
+        } else {
+            const xrnr = randMinMaxFloat(-1,1);
+            const yrnr = randMinMaxFloat(-1,1);
+
+            std.debug.print("rngx:{}\nyrng:{}\n",.{xrnr,yrnr});
+            self.lifespan = rand.intRangeAtMost(u8,1,100);
+            self.acceleration.a.x = xrnr;
+            self.acceleration.a.y = yrnr;
+            self.position.a.x = 0;
+            self.position.a.y = 0;
+            self.velocity.a.x = 0;
+            self.velocity.a.y = 0;
+            self.position.a.color.r = rand.intRangeAtMost(u8,0,255);
+            self.position.a.color.g = rand.intRangeAtMost(u8,0,255);
+            self.position.a.color.b = rand.intRangeAtMost(u8,0,255);
+        }
+
     }
 };
 
@@ -25,8 +72,23 @@ pub fn main() anyerror!void {
     const rect2 = rl.Rectangle{ .x = @as(f32, @floatFromInt(10)), .y = @as(f32, @floatFromInt(10)), .width = @as(f32, @floatFromInt(300)), .height = @as(f32, @floatFromInt(100)) };
     var msg_res : i32=-1;
     var state : i32=-1;
+    
+    var seed:u64 = undefined;
+    try std.posix.getrandom(std.mem.asBytes(&seed));
 
-    const p1 = Particle{.velocity = .{.a = .{.x = 1,.y = 1}}};
+    prng = std.rand.DefaultPrng.init(seed);
+    var xrnr : f32 = 0;
+    var yrnr : f32 = 0;
+
+    var posx : i32 = 0;
+    var posy : i32 = 0;
+
+    var p1 : [100]Particle = undefined;
+    for (&p1) |*p| {
+        xrnr = rand.float(f32);
+        yrnr = rand.float(f32);
+        p.* = Particle{.velocity = .{.a = .{.x = 5,.y = 1}},.acceleration = .{.a = .{.x=xrnr,.y=yrnr}}};
+    }
 
     rl.initWindow(screenWidth, screenHeight, "raylib-zig [core] example - basic window");
     defer rl.closeWindow(); // Close window and OpenGL context
@@ -59,8 +121,20 @@ pub fn main() anyerror!void {
                     else =>{},
             }
         }
-        p1.update();
-        rl.drawCircle(p1.position.a.x,p1.position.a.y,40,rl.Color{.r=124,.g=195,.b=217,.a=100});
+        for (&p1) |*p| {
+            p.update();
+            if(p.position.a.x >= -(screenWidth/2)){
+                posx = @intFromFloat(screenWidth / 2 + p.position.a.x);
+            } else {
+                posx  = 0;
+            }
+            if(p.position.a.y >= -(screenHeight/2)){
+                posy = @intFromFloat(screenHeight / 2 + p.position.a.y);
+            } else {
+                posy = 0;
+            }
+            rl.drawCircle(posx,posy,5,rl.Color{.r=p.position.a.color.r,.g=p.position.a.color.g,.b=p.position.a.color.b,.a=255});
+        }
 
 
     }