Circles spawning area

This commit closes #9

.gitignore

@@ -11,3 +11,6 @@ target_wasm
 
 # https://github.com/lycheeverse/lychee
 .lycheecache
+
+# IDE
+.vscode

src/app.rs

@@ -1,3 +1,5 @@
+use std::cmp::min;
+
 use egui::{Color32, Stroke, Vec2};
 use rand::Rng;
 
@@ -110,22 +112,6 @@ impl eframe::App for Simulation {
 
             ui.add(egui::Slider::new(&mut self.circles_count, 0..=25).text("circles count"));
 
-            let diff = (self.circles.len() as i32) - (self.circles_count as i32);
-            if diff > 0 {
-                self.circles.truncate(self.circles_count);
-            } else {
-                for _ in diff..0 {
-                    self.circles.push(Circle::default());
-                    self.colors.push(
-                        egui::Color32::from_rgba_premultiplied(
-                            rand::thread_rng().gen_range(64..255),
-                            rand::thread_rng().gen_range(64..255),
-                            rand::thread_rng().gen_range(64..255),
-                            128)
-                        );
-                }
-            }
-
             let painter = ui.painter();
 
             let (hover_pos, any_down, any_released) = ctx.input(|input| (
@@ -142,7 +128,7 @@ impl eframe::App for Simulation {
                         if any_down {
                             painter.line_segment(
                             [circle.c, circle.c +d], 
-                                Stroke{width: 1.0, color: Color32::from_rgb(128, 255, 255)});
+                                Stroke{width: 3.0, color: Color32::from_rgb(255, 0, 0)});
                         }
 
                         if any_released {
@@ -152,7 +138,7 @@ impl eframe::App for Simulation {
                 });
             }
 
-            for i in 0..self.circles_count {
+            for i in 0..min(self.circles.len(), self.colors.len())  {
                 painter.circle(
                     self.circles[i].c, 
                     self.circles[i].r, 
@@ -172,6 +158,23 @@ impl eframe::App for Simulation {
             });
         });
 
+
+        let diff = (self.circles.len() as i32) - (self.circles_count as i32);
+        if diff > 0 {
+            self.circles.truncate(self.circles_count);
+        } else {
+            for _ in diff..0 {
+                self.circles.push(Circle::new(&ctx.used_rect()));
+                self.colors.push(
+                    egui::Color32::from_rgba_premultiplied(
+                        rand::thread_rng().gen_range(64..255),
+                        rand::thread_rng().gen_range(64..255),
+                        rand::thread_rng().gen_range(64..255),
+                        128)
+                    );
+            }
+        }
+
         for circle in &mut self.circles {
             circle.apply_force(&ctx.used_rect());
         }

src/circle.rs

@@ -1,4 +1,5 @@
 use egui::{Pos2, Rect, Vec2};
+use log::debug;
 use rand::Rng;
 
 pub static FRICTION: f32 = 0.995;
@@ -13,7 +14,7 @@ impl Default for Circle {
     fn default() -> Self {
         let r = rand::thread_rng().gen_range(20.0..50.0);
         Self {
-            r: r,
+            r,
             c: Pos2 {
                 x: rand::thread_rng().gen_range(r..400.0-r),
                 y: rand::thread_rng().gen_range(r..400.0-r)},
@@ -50,4 +51,19 @@ impl Circle {
         }
     }
 
+    pub fn new(bb: &Rect) -> Self {
+
+        debug!("bb: {}..{} {}..{}",bb.left(), bb.right(), bb.top(), bb.bottom() );
+        
+        Self {
+            r: rand::thread_rng().gen_range(20.0..50.0),
+            c: Pos2 {
+                x: rand::thread_rng().gen_range(bb.left()..bb.right()),
+                y: rand::thread_rng().gen_range(bb.top()..bb.bottom())},
+            v: Vec2 {
+                x: rand::thread_rng().gen_range(-2.0..2.0),
+                y: rand::thread_rng().gen_range(-2.0..2.0)},
+        }
+    }
+
 }