From 22c656d0be6dd5356f8839fae716174a9fe474c7 Mon Sep 17 00:00:00 2001
From: Nathan Reiner <nathan@nathanreiner.xyz>
Date: Fri, 19 Jan 2024 18:11:56 +0100
Subject: only calculate evey point once

---
 src/main.rs | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

(limited to 'src/main.rs')

diff --git a/src/main.rs b/src/main.rs
index 90fc7ea..34adc14 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -227,19 +227,18 @@ impl canvas::Program<Message, Renderer> for Graph {
                     state.map_coords(end_x as f32, 0.0),
                 );
                 frame.stroke(&line, zeroline.clone());
-
+                let mut y1 = self
+                    .func
+                    .eval(
+                        FunctionArgument::new(vec![Complex::new(start_x as f64, 0.0)]),
+                        &self.ctx,
+                    )
+                    .unwrap()
+                .real as f32;
                 for x in start_x..end_x {
                     for d in 0..10 {
                         let d = d as f32 / 10.0;
                         let x1 = x as f32 + d;
-                        let y1 = self
-                            .func
-                            .eval(
-                                FunctionArgument::new(vec![Complex::new(x1 as f64, 0.0)]),
-                                &self.ctx,
-                            )
-                            .unwrap()
-                            .real as f32;
                         let x2 = x as f32 + d + 0.1;
                         let y2 = self
                             .func
@@ -253,6 +252,7 @@ impl canvas::Program<Message, Renderer> for Graph {
                             let line = Path::line(state.map_coords(x1, y1), state.map_coords(x2, y2));
                             frame.stroke(&line, graphline.clone())
                         }
+                        y1 = y2;
                     }
                 }
             });
-- 
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