From 79554285331846db8a1d06e2570d5acbb2f2690e Mon Sep 17 00:00:00 2001
From: Nathan Reiner <nathan@nathanreiner.xyz>
Date: Sun, 21 Jan 2024 17:25:43 +0100
Subject: implement dynamic graph removal and pushing

---
 src/ui/graph.rs | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

(limited to 'src/ui')

diff --git a/src/ui/graph.rs b/src/ui/graph.rs
index 83d90f8..14f0c7d 100644
--- a/src/ui/graph.rs
+++ b/src/ui/graph.rs
@@ -36,6 +36,7 @@ impl GraphCanvas {
 
     pub fn push(&mut self, f: &str) {
         if let Ok(f) = ExpressionFunction::from_string(f.to_string(), self.ctx.operations()) {
+            self.ctx.set_function(f.name(), std::sync::Arc::new(f.clone()));
             self.funcs.lock().unwrap().push(Some(FunctionCache::new(f)));
         } else {
             self.funcs.lock().unwrap().push(None);
@@ -43,15 +44,28 @@ impl GraphCanvas {
     }
 
     pub fn set(&mut self, i: usize, f: &str) {
-        if let Ok(f) = ExpressionFunction::from_string(f.to_string(), self.ctx.operations()) {
-            self.funcs.lock().unwrap()[i] = Some(FunctionCache::new(f));
-        } else {
-            self.funcs.lock().unwrap().push(None);
+        if let Ok(mut vf) = self.funcs.lock() {
+            if let Some(last_f) = &vf[i] {
+                self.ctx.remove_function(last_f.name());
+            }
+
+            if let Ok(f) = ExpressionFunction::from_string(f.to_string(), self.ctx.operations()) {
+                self.ctx.set_function(f.name(), std::sync::Arc::new(f.clone()));
+                vf[i] = Some(FunctionCache::new(f));
+            } else {
+                vf[i] = None;
+            }
+
         }
     }
 
     pub fn remove(&mut self, i: usize) {
-        self.funcs.lock().unwrap().remove(i);
+        if let Ok(mut vf) = self.funcs.lock() {
+            if let Some(f) = &vf[i] {
+                self.ctx.remove_function(f.name());
+            }
+            vf.remove(i);
+        }
     }
 }
 
@@ -220,10 +234,11 @@ impl canvas::Program<Message, Renderer> for GraphCanvas {
             {
                 let mut y1 = func.eval(Complex::new(rect.x as f64, 0.0), &self.ctx).real as f32;
                 for x in (rect.x as i64..(rect.x + rect.width) as i64).step_by(step) {
-                    for d in 0..10 {
-                        let d = d as f32 / 10.0;
+                    let precision = state.scale as i64;
+                    for d in 0..precision {
+                        let d = d as f32 / (precision as f32);
                         let x1 = x as f32 + d * step as f32;
-                        let x2 = x as f32 + (d + 0.1) * step as f32;
+                        let x2 = x as f32 + (d + (1.0 / precision as f32)) * step as f32;
                         let y2 = func.eval(Complex::new(x2 as f64, 0.0), &self.ctx).real as f32;
                         if y1.is_finite() && !y1.is_nan() && y2.is_finite() && !y2.is_nan() {
                             let line =
-- 
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