wasm: hook up dot count to html input

1 files changed, 7 insertions, 6 deletions

diff --git a/src/state.rs b/src/state.rs
index 592f26e..1793388 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -11,7 +11,6 @@ use crate::point::Point;
 pub const TAU: f64 = PI * 2.0;
 pub const MAX_SPEED: f64 = 0.01;
 
-const NUM_POINTS: usize = 40;
 const VELVEC_SCALE: f64 = 3.0;
 
 #[derive(Debug)]
@@ -33,15 +32,11 @@ impl State {
             .dyn_into()?;
         ctx.scale(canvas.width().into(), canvas.height().into())?;
 
-        let points = (0..NUM_POINTS)
-            .map(|_| Point::new(fastrand::f64(), fastrand::f64()))
-            .collect();
-
         Ok(Self {
             canvas,
             ctx,
             fps,
-            points,
+            points: vec![],
             last_time: None,
             inter_count: 1,
         })
@@ -104,6 +99,12 @@ impl State {
         Ok(())
     }
 
+    pub fn set_dot_count(&mut self, n: usize) {
+        self.points = (0..n)
+            .map(|_| Point::new(fastrand::f64(), fastrand::f64()))
+            .collect();
+    }
+
     fn render_points(&self) -> JSResult<()> {
         for p in &self.points {
             self.ctx.set_fill_style_str(&p.color);