From f57f03cd87d205d8304008d08c05f53c34b44435 Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Wed, 7 Apr 2021 19:07:33 +0530
Subject: use floating angles

---
 src/app.rs    | 50 +++++++++++---------------------------------------
 src/bitmap.rs |  6 +++---
 src/consts.rs |  1 +
 src/main.rs   |  1 +
 4 files changed, 16 insertions(+), 42 deletions(-)

diff --git a/src/app.rs b/src/app.rs
index f42b48c..e8c5260 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -3,9 +3,10 @@ use crate::{
     brush::{Brush, CircleBrush, LineBrush},
     cache::Cache,
     command::CommandBox,
-    consts::{colors::*, FONT_PATH, RC_PATH, STDLIB_PATH},
+    consts::{colors::*, ANGLE, FONT_PATH, RC_PATH, STDLIB_PATH},
     dither,
     error::AppError,
+    grid::Grid,
     guide::Guide,
     lisp::{eval, lex::Lexer, parse::Parser, prelude, EnvList},
     message::Message,
@@ -68,20 +69,6 @@ pub struct AppState<'ctx> {
     pub zoom: u8,
 }
 
-pub struct Grid {
-    pub enabled: bool,
-    pub color: Color,
-}
-
-impl Grid {
-    fn new() -> Self {
-        Self {
-            enabled: true,
-            color: GRID_COLOR,
-        }
-    }
-}
-
 // private actions on appstate
 impl<'ctx> AppState<'ctx> {
     fn pan<P: Into<Point>>(&mut self, direction: P) {
@@ -331,27 +318,6 @@ impl<'ctx> AppState<'ctx> {
         self.mode = Mode::Draw;
     }
 
-    fn draw_grid(&mut self) {
-        let cs = self.zoom as u32;
-        let (width, height) = (self.width(), self.height());
-        let canvas = &mut self.canvas;
-        canvas.set_draw_color(self.grid.color);
-        for i in 1..width {
-            let x = (i * cs) as i32;
-            let y = (height * cs) as i32;
-            let start = self.start + Point::new(x, 0);
-            let end = self.start + Point::new(x, y);
-            canvas.draw_line(start, end).unwrap();
-        }
-        for j in 1..height {
-            let x = (width * cs) as i32;
-            let y = (j * cs) as i32;
-            let start = self.start + Point::new(0, y);
-            let end = self.start + Point::new(x, y);
-            canvas.draw_line(start, end).unwrap();
-        }
-    }
-
     fn draw_statusline(&mut self) {
         let container = Container::new(Offset::Left(0), Offset::Bottom(40), &self.canvas)
             .width(Size::Max, &self.canvas)
@@ -482,10 +448,15 @@ impl<'ctx> AppState<'ctx> {
             let size = self.zoom as u32 * (size as u32 + 5);
             if let (Some(from), Some(to)) = (start, pt) {
                 let line = self.pixmap.get_line(from, to.into());
+                let angle = positive_angle_with_x(from, to.into());
                 draw_text(
                     &mut self.canvas,
                     self.ttf_context,
-                    format!("{}°", positive_angle_with_x(from, to.into())),
+                    format!(
+                        "{:.width$}°",
+                        angle,
+                        width = if (angle - ANGLE).abs() < 1e-3 { 3 } else { 0 }
+                    ),
                     PINK,
                     (self.mouse.0 + size as i32, self.mouse.1 + size as i32),
                 );
@@ -546,7 +517,7 @@ impl<'ctx> AppState<'ctx> {
 
     fn draw(&mut self) {
         let cs = self.zoom as u32;
-        let (width, _) = (self.width(), self.height());
+        let (width, height) = (self.width(), self.height());
         let start = self.start;
         let grid_enabled = self.grid.enabled;
         self.canvas.set_draw_color(WHITE);
@@ -576,7 +547,8 @@ impl<'ctx> AppState<'ctx> {
             ))
             .unwrap();
         if grid_enabled {
-            self.draw_grid();
+            self.grid
+                .draw(&mut self.canvas, self.zoom, &self.start, width, height);
         }
         self.draw_guides();
         self.draw_symmetry();
diff --git a/src/bitmap.rs b/src/bitmap.rs
index 2f96a99..ba5c8f1 100644
--- a/src/bitmap.rs
+++ b/src/bitmap.rs
@@ -325,11 +325,11 @@ pub fn reflect_figure(figure: &[MapPoint], around: MapPoint) -> Vec<MapPoint> {
     figure.iter().map(|pt| pt.reflect(around)).collect()
 }
 
-pub fn positive_angle_with_x(start: MapPoint, end: MapPoint) -> u32 {
+pub fn positive_angle_with_x(start: MapPoint, end: MapPoint) -> f64 {
     if end.x == start.x {
-        return 90;
+        return 90.;
     }
     let numer = (end.y as f64 - start.y as f64).abs();
     let denum = (end.x as f64 - start.x as f64).abs();
-    (numer / denum).atan().to_degrees() as u32
+    (numer / denum).atan().to_degrees()
 }
diff --git a/src/consts.rs b/src/consts.rs
index 0b43f0a..7087073 100644
--- a/src/consts.rs
+++ b/src/consts.rs
@@ -11,3 +11,4 @@ pub mod colors {
 pub const FONT_PATH: &str = "./assets/NerdInput-Regular.ttf";
 pub const STDLIB_PATH: &str = "./src/lisp/std.lisp";
 pub const RC_PATH: &str = "/home/np/.config/sdl-tests";
+pub const ANGLE: f64 = 26.565;
diff --git a/src/main.rs b/src/main.rs
index 245ee83..220956a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,6 +8,7 @@ mod command;
 mod consts;
 mod dither;
 mod error;
+mod grid;
 mod guide;
 mod lisp;
 mod message;
-- 
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