Add constant for the grid accuracy

0.5 was used as a magical number throughout the code for that until now,
which I now changed.

4 files changed, 14 insertions, 9 deletions

diff --git a/src/grid.rs b/src/grid.rs
index ecc59c3..72a849a 100644
--- a/src/grid.rs
+++ b/src/grid.rs
@@ -3,6 +3,9 @@ use crate::transform::Transform;
 use raylib::drawing::RaylibDraw;
 use raylib::ffi::Color;
 
+/// The internal grid length which will be used to snap things to it.
+pub const SNAP_SIZE: f32 = 0.5;
+
 pub const LINE_COLOUR: Color = Color {
     r: 255,
     g: 255,
diff --git a/src/tool/icon_tool.rs b/src/tool/icon_tool.rs
index 702c30e..bd16de8 100644
--- a/src/tool/icon_tool.rs
+++ b/src/tool/icon_tool.rs
@@ -1,6 +1,6 @@
 use crate::button::Button;
 use crate::config::{IconToolKeybindings, ToolKeybindings};
-use crate::grid::snap_to_grid;
+use crate::grid::{snap_to_grid, SNAP_SIZE};
 use crate::map_data::MapData;
 use crate::math::Vec2;
 use crate::tool::Tool;
@@ -125,8 +125,10 @@ impl Tool for IconTool {
 
     fn active_update(&mut self, map: &mut MapData, rl: &RaylibHandle, transform: &Transform) {
         // Update the position of the icon that should be drawn to the current mouse position.
-        let snapped_mouse_pos_m =
-            snap_to_grid(transform.point_px_to_m(rl.get_mouse_position().into()), 0.5);
+        let snapped_mouse_pos_m = snap_to_grid(
+            transform.point_px_to_m(rl.get_mouse_position().into()),
+            SNAP_SIZE,
+        );
         self.current_icon.position = snapped_mouse_pos_m;
 
         // Unwrap the current icon, since it is now definitely set, as we are in the active update.
diff --git a/src/tool/room_tool.rs b/src/tool/room_tool.rs
index bb719e0..0ac74b5 100644
--- a/src/tool/room_tool.rs
+++ b/src/tool/room_tool.rs
@@ -2,7 +2,7 @@ use super::Tool;
 use crate::button::Button;
 use crate::config::{RoomToolKeybindings, ToolKeybindings};
 use crate::dimension_indicator::DimensionIndicator;
-use crate::grid::snap_to_grid;
+use crate::grid::{snap_to_grid, SNAP_SIZE};
 use crate::map_data::MapData;
 use crate::math::{Rect, Vec2};
 use crate::transform::Transform;
@@ -34,7 +34,7 @@ impl Tool for RoomTool {
         let mouse_pos_m = transform.point_px_to_m(rl.get_mouse_position().into());
         // Update the currently drawn rectangle, if it exists, and also its dimension indicator.
         if let Some((ref pos1, ref mut pos2)) = &mut self.unfinished_rect {
-            *pos2 = snap_to_grid(mouse_pos_m, 0.5);
+            *pos2 = snap_to_grid(mouse_pos_m, SNAP_SIZE);
 
             self.dimension_indicator.update_dimensions(&[*pos1, *pos2]);
         }
@@ -44,7 +44,7 @@ impl Tool for RoomTool {
             let (pos1, pos2) = self.unfinished_rect.take().unwrap();
             map_data.rooms_mut().push(Rect::bounding_rect(pos1, pos2));
         } else if self.keybindings.start_draw.is_pressed(rl) {
-            let snapped_mouse_pos = snap_to_grid(mouse_pos_m, 0.5);
+            let snapped_mouse_pos = snap_to_grid(mouse_pos_m, SNAP_SIZE);
             self.unfinished_rect = Some((snapped_mouse_pos, snapped_mouse_pos))
         }
 
diff --git a/src/tool/wall_tool.rs b/src/tool/wall_tool.rs
index e815484..157f626 100644
--- a/src/tool/wall_tool.rs
+++ b/src/tool/wall_tool.rs
@@ -1,7 +1,7 @@
 use super::Tool;
 use crate::button::Button;
 use crate::config::{ToolKeybindings, WallToolKeybindings};
-use crate::grid::snap_to_grid;
+use crate::grid::{snap_to_grid, SNAP_SIZE};
 use crate::map_data::MapData;
 use crate::math::Vec2;
 use crate::transform::Transform;
@@ -27,7 +27,7 @@ impl Tool for WallTool {
     fn active_update(&mut self, map_data: &mut MapData, rl: &RaylibHandle, transform: &Transform) {
         let mouse_pos_m = transform.point_px_to_m(rl.get_mouse_position().into());
         if let Some((_, ref mut pos2)) = &mut self.unfinished_wall {
-            *pos2 = snap_to_grid(mouse_pos_m, 0.5);
+            *pos2 = snap_to_grid(mouse_pos_m, SNAP_SIZE);
         }
 
         if self.keybindings.finish_segment.is_pressed(rl) && self.unfinished_wall.is_some() {
@@ -35,7 +35,7 @@ impl Tool for WallTool {
             map_data.walls_mut().push((pos1, pos2));
             self.unfinished_wall = Some((pos2, pos2));
         } else if self.keybindings.start_wall.is_pressed(rl) {
-            let snapped_mouse_pos = snap_to_grid(mouse_pos_m, 0.5);
+            let snapped_mouse_pos = snap_to_grid(mouse_pos_m, SNAP_SIZE);
             self.unfinished_wall = Some((snapped_mouse_pos, snapped_mouse_pos))
         }