haaacky pixel->coord conversion

examples/test.rs

@@ -25,14 +25,16 @@ impl Game for World {
             pos: Vec2::zero(),
             map: HexMap::new(
                 Vec2 { x: 27, y: 13 },
-                Tileset::load_data(include_bytes!("assets/hex2.gif"), Vec2 { x: 1, y: 1 }),
+                Tileset::load_data(include_bytes!("assets/hex2.gif"), Vec2 { x: 2, y: 1 }),
+                Vec2 { x: 23, y: 13 },
             ),
         }
     }
 
     fn update(&mut self, window_state: &mut WindowState) {
         self.pos = window_state.mouse_pos();
-        window_state.log(format!("{}x{}", self.pos.x, self.pos.y).as_str());
+        let coord = self.map.pixel_to_coord(self.pos);
+        window_state.log(format!("{}x{}", coord.x, coord.y).as_str());
     }
 
     fn on_event(&mut self, window_state: &mut WindowState, event: Event) {
@@ -40,6 +42,10 @@ impl Game for World {
             Event::MouseClick(MouseButton::Left, _) => {
                 window_state.scramble_palette();
             }
+            Event::MouseClick(MouseButton::Right, _) => {
+                self.map
+                    .set(self.map.pixel_to_coord(window_state.mouse_pos()), 1);
+            }
             _ => {}
         }
     }

src/hexmap.rs

@@ -1,4 +1,5 @@
 use crate::{Image, Tileset, Vec2};
+use num::complex::ComplexFloat;
 use std::rc::Rc;
 
 //odd-q vertical layout https://www.redblobgames.com/grids/hexagons
@@ -6,15 +7,18 @@ pub struct HexMap {
     size: Vec2<i32>,
     data: Vec<i32>,
     tileset: Rc<Tileset>,
+    pix_tile_off: Vec2<i32>,
 }
 
 impl HexMap {
     //pub static
-    pub fn new(size: Vec2<i32>, tileset: Rc<Tileset>) -> Self {
+    //pix_tile_off: x offset per tile, up/down alternating y offset on x axis
+    pub fn new(size: Vec2<i32>, tileset: Rc<Tileset>, pix_tile_off: Vec2<i32>) -> Self {
         HexMap {
             size,
             data: vec![0; size.size()],
             tileset,
+            pix_tile_off,
         }
     }
 
@@ -23,6 +27,32 @@ impl HexMap {
         self.data[self.coord_to_idx(coord)]
     }
 
+    pub fn pixel_to_coord(&self, pixel: Vec2<i32>) -> Vec2<i32> {
+        let tilesize = self.tileset.tile_size();
+        let xrepeat = pixel.x % self.pix_tile_off.x;
+        let mut x = pixel.x / self.pix_tile_off.x;
+        let py = if x % 2 == 0 {
+            pixel.y
+        } else {
+            pixel.y - self.pix_tile_off.y
+        };
+        let yrepeat = py % tilesize.y;
+        let mut y = py / tilesize.y;
+        let outside = self.tileset.get(0).get_pixel(Vec2 {
+            x: xrepeat,
+            y: yrepeat,
+        }) == 0;
+        if outside {
+            x -= 1;
+            if yrepeat > tilesize.y / 2 {
+                y += 1;
+            }
+            y -= x % 2;
+        }
+        let slice = xrepeat / (tilesize.x / 4);
+        Vec2 { x, y }
+    }
+
     pub fn set(&mut self, coord: Vec2<i32>, val: i32) {
         let idx = self.coord_to_idx(coord);
         self.data[idx] = val;
@@ -39,9 +69,8 @@ impl HexMap {
         coord: Vec2<i32>,
         offset: Vec2<i32>,
     ) {
-        let x = coord.x * (self.tileset.tile_size().x as f64 * 3.0 / 4.0).ceil() as i32;
-        let y =
-            coord.y * self.tileset.tile_size().y + (coord.x % 2) * (self.tileset.tile_size().y / 2);
+        let x = coord.x * self.pix_tile_off.x;
+        let y = coord.y * self.tileset.tile_size().y + (coord.x % 2) * self.pix_tile_off.y;
         target.draw_image(
             Vec2 { x, y } + offset,
             self.tileset.get(self.data[self.coord_to_idx(coord)]),