stuff

TODO.md

@@ -17,4 +17,6 @@
 7. sliding values for functions (like a user-interactable slider that adjusts a variable in the function, like desmos)
 8. Keybinds
 9. nth derivative support (again)
-10. Update function tests
+10. Update function tests
+11. rewrite FunctionEntry to move more information and handling to egui_app (such as config changes)
+12. dynamically adjust newton iterations and resolution of graph based on performance and if the machine is lagging

src/egui_app.rs

@@ -263,6 +263,10 @@ struct AppSettings {
 
     // Stores whether or not dark mode is enabled
     pub dark_mode: bool,
+
+    pub extrema: bool,
+
+    pub roots: bool,
 }
 
 impl Default for AppSettings {
@@ -276,6 +280,8 @@ impl Default for AppSettings {
             integral_max_x: DEFAULT_MAX_X,
             integral_num: DEFAULT_INTEGRAL_NUM,
             dark_mode: true,
+            extrema: true,
+            roots: true,
         }
     }
 }
@@ -323,6 +329,29 @@ impl MathApp {
                         ui.selectable_value(&mut self.settings.sum, RiemannSum::Right, "Right");
                     });
 
+                let mut extrema_toggled: bool = false;
+                let mut roots_toggled: bool = false;
+                ui.horizontal(|ui| {
+                    extrema_toggled = ui
+                        .add(Button::new("Extrema"))
+                        .on_hover_text(match self.settings.extrema {
+                            true => "Disable Displaying Extrema",
+                            false => "Display Extrema",
+                        })
+                        .clicked();
+
+                    roots_toggled = ui
+                        .add(Button::new("Roots"))
+                        .on_hover_text(match self.settings.roots {
+                            true => "Disable Displaying Roots",
+                            false => "Display Roots",
+                        })
+                        .clicked();
+                });
+
+                self.settings.extrema.bitxor_assign(extrema_toggled);
+                self.settings.roots.bitxor_assign(roots_toggled);
+
                 let min_x_old = self.settings.integral_min_x;
                 let min_x_changed = ui
                     .add(
@@ -359,6 +388,12 @@ impl MathApp {
                     )
                     .changed();
 
+                let configs_changed = max_x_changed
+                    | min_x_changed
+                    | integral_num_changed
+                    | roots_toggled
+                    | extrema_toggled;
+
                 let functions_len = self.functions.len();
                 let mut remove_i: Option<usize> = None;
                 for (i, function) in self.functions.iter_mut().enumerate() {
@@ -405,11 +440,9 @@ impl MathApp {
                     });
 
                     let proc_func_str = process_func_str(self.func_strs[i].clone());
-                    if integral_toggle
+                    if configs_changed
+                        | integral_toggle
                         | derivative_toggle
-                        | max_x_changed
-                        | min_x_changed
-                        | integral_num_changed
                         | (proc_func_str != function.get_func_str())
                         | self.last_error.iter().any(|ele| ele.0 == i)
                     {
@@ -434,6 +467,8 @@ impl MathApp {
                                 Some(self.settings.integral_max_x),
                                 Some(self.settings.integral_num),
                                 Some(self.settings.sum),
+                                self.settings.extrema,
+                                self.settings.roots,
                             );
                             self.last_error = self
                                 .last_error

src/function.rs

@@ -42,6 +42,8 @@ pub struct FunctionEntry {
     integral_max_x: f64,
     integral_num: usize,
     sum: RiemannSum,
+    roots: bool,
+    extrema: bool,
 }
 
 // How many times should newton's method iterate?
@@ -63,12 +65,15 @@ impl FunctionEntry {
             integral_max_x: f64::NAN,
             integral_num: 0,
             sum: DEFAULT_RIEMANN,
+            roots: true,
+            extrema: true,
         }
     }
 
     pub fn update(
         &mut self, func_str: String, integral: bool, derivative: bool, integral_min_x: Option<f64>,
         integral_max_x: Option<f64>, integral_num: Option<usize>, sum: Option<RiemannSum>,
+        extrema: bool, roots: bool,
     ) {
         // If the function string changes, just wipe and restart from scratch
         if func_str != self.func_str {
@@ -79,6 +84,8 @@ impl FunctionEntry {
 
         self.derivative = derivative;
         self.integral = integral;
+        self.extrema = extrema;
+        self.roots = roots;
 
         // Makes sure proper arguments are passed when integral is enabled
         if integral
@@ -289,7 +296,14 @@ impl FunctionEntry {
                 continue;
             }
 
-            if last_ele.unwrap().y.signum() != ele.y.signum() {
+            let last_ele_signum = last_ele.unwrap().y.signum();
+            let ele_signum = ele.y.signum();
+
+            if last_ele_signum.is_nan() | ele_signum.is_nan() {
+                continue;
+            }
+
+            if last_ele_signum != ele_signum {
                 // Do 50 iterations of newton's method, should be more than accurate
                 let x = {
                     let mut x1: f64 = last_ele.unwrap().x;
@@ -317,7 +331,14 @@ impl FunctionEntry {
                 continue;
             }
 
-            if last_ele.unwrap().y.signum() != ele.y.signum() {
+            let last_ele_signum = last_ele.unwrap().y.signum();
+            let ele_signum = ele.y.signum();
+
+            if last_ele_signum.is_nan() | ele_signum.is_nan() {
+                continue;
+            }
+
+            if last_ele_signum != ele_signum {
                 // Do 50 iterations of newton's method, should be more than accurate
                 let x = {
                     let mut x1: f64 = last_ele.unwrap().x;
@@ -341,8 +362,18 @@ impl FunctionEntry {
         self.output.back = Some(back_values);
         self.output.integral = integral;
         self.output.derivative = derivative;
-        self.extrema();
-        self.roots();
+
+        if self.extrema {
+            self.extrema();
+        } else {
+            self.output.extrema = None;
+        }
+
+        if self.roots {
+            self.roots();
+        } else {
+            self.output.roots = None;
+        }
 
         self.output.display(
             plot_ui,

src/parsing.rs

@@ -1,7 +1,7 @@
 use exmex::prelude::*;
 
 lazy_static::lazy_static! {
-    static ref EMPTY_FUNCTION: FlatEx<f64> = exmex::parse::<f64>("0").unwrap();
+    static ref EMPTY_FUNCTION: FlatEx<f64> = exmex::parse::<f64>("0/0").unwrap();
 }
 
 #[derive(Clone)]