From 5c0dd5558eee93b874bcd3bcc74cc1fefe319952 Mon Sep 17 00:00:00 2001
From: lifning <>
Date: Sun, 17 Oct 2021 22:23:35 -0700
Subject: [PATCH] better looking snow

---
 src/main.rs | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 3e6e56f..9f58ca9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,7 +9,7 @@ use sdl2::render::{WindowCanvas, BlendMode};
 use sdl2::image::ImageRWops;
 use sdl2::surface::Surface;
 use sdl2::pixels::{Color, PixelFormatEnum};
-use sdl2::rect::Rect;
+use sdl2::rect::Point;
 
 use rand::{SeedableRng, Rng};
 use rand_xoshiro::Xoshiro128Plus;
@@ -44,7 +44,7 @@ struct Zretro {
     font: Surface<'static>,
     rng: Xoshiro128Plus,
     ui_bg: Option<Surface<'static>>,
-    snowflakes: Vec<Rect>,
+    snowflakes: Vec<Point>,
 }
 
 const FONT_PNG: &'static [u8] = include_bytes!("lifont.png");
@@ -101,10 +101,10 @@ impl Zretro {
         let mut ui_bg = Surface::new(geometry.base_width, geometry.base_height, PixelFormatEnum::ABGR8888)?;
         ui_bg.fill_rect(None, Color::RGBA(0, 0, 128, 128))?;
         let snowflakes = (0..100).into_iter()
-            .map(|_| Rect::new(
+            .map(|_| Point::new(
                 rng.gen_range(0..ui_bg.width() as i32),
                 rng.gen_range(0..ui_bg.height() as i32),
-                2, 2))
+            ))
             .collect();
 
         Ok(Zretro {
@@ -122,15 +122,22 @@ impl Zretro {
         ui_bg.fill_rect(None, Color::RGBA(0, 0, 128, 128))?;
         let w = ui_bg.width() as i32;
         let h = ui_bg.height() as i32;
-        for flake in &mut self.snowflakes {
-            let x = flake.x() + self.rng.gen_range(-1..=1);
+        let halflen = self.snowflakes.len() / 2;
+        for flake in &mut self.snowflakes[..halflen] {
+            let x = flake.x() + self.rng.gen_range(0..=1);
             let y = flake.y() + 1;
-            flake.set_x(x % w);
-            flake.set_y(y % h);
+            *flake = Point::new(x % w, y % h);
+        }
+        for flake in &mut self.snowflakes[halflen..] {
+            let x = flake.x();
+            let y = flake.y() + self.rng.gen_range(0..=1);
+            *flake = Point::new(x, y % h);
         }
         let mut ui_canvas = ui_bg.into_canvas()?;
         ui_canvas.set_draw_color(Color::RGBA(255, 255, 255, 160));
-        ui_canvas.draw_rects(&self.snowflakes[..])?;
+        ui_canvas.draw_points(&self.snowflakes[..halflen])?;
+        ui_canvas.set_draw_color(Color::RGBA(255, 255, 255, 128));
+        ui_canvas.draw_points(&self.snowflakes[halflen..])?;
         self.ui_bg = Some(ui_canvas.into_surface());
         Ok(())
     }