Convert glade components to Rust and add the palette (#26)

Co-authored-by: Savanni D'Gerinel <savanni@luminescent-dreams.com>
Reviewed-on: savanni/tools#26

hex-grid/resources/main.glade

@@ -1,99 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<interface>
-  <template class="HexGridWindow" parent="GtkApplicationWindow">
-    <property name="can-focus">False</property>
-    <child>
-      <object class="GtkBox">
-        <property name="visible">True</property>
-        <property name="can-focus">False</property>
-        <property name="spacing">8</property>
-        <child>
-          <object class="GtkDrawingArea" id="drawing_area">
-            <property name="width-request">1024</property>
-            <property name="height-request">768</property>
-            <property name="visible">True</property>
-            <property name="can-focus">False</property>
-            <property name="margin-start">8</property>
-            <property name="margin-end">8</property>
-            <property name="margin-top">8</property>
-            <property name="margin-bottom">8</property>
-            <property name="hexpand">True</property>
-          </object>
-        </child>
-        <child>
-          <object class="GtkBox">
-            <property name="width-request">100</property>
-            <property name="visible">True</property>
-            <property name="can-focus">False</property>
-            <property name="margin-start">4</property>
-            <property name="margin-end">4</property>
-            <property name="margin-top">4</property>
-            <property name="margin-bottom">4</property>
-            <property name="orientation">vertical</property>
-            <property name="spacing">8</property>
-            <child>
-              <object class="GtkBox">
-                <property name="visible">True</property>
-                <property name="can-focus">False</property>
-                <property name="hexpand">True</property>
-                <property name="spacing">8</property>
-                <property name="homogeneous">True</property>
-                <child>
-                  <object class="GtkLabel">
-                    <property name="visible">True</property>
-                    <property name="can-focus">False</property>
-                    <property name="label" translatable="yes">Canvas Address</property>
-                  </object>
-                </child>
-                <child>
-                  <object class="GtkLabel" id="canvas_address">
-                    <property name="visible">True</property>
-                    <property name="can-focus">False</property>
-                    <property name="margin-start">4</property>
-                    <property name="margin-end">4</property>
-                    <property name="margin-top">4</property>
-                    <property name="margin-bottom">4</property>
-                    <property name="label" translatable="yes">-----</property>
-                  </object>
-                </child>
-              </object>
-          </child>
-          <child>
-              <object class="GtkBox">
-                <property name="visible">True</property>
-                <property name="can-focus">False</property>
-                <property name="hexpand">True</property>
-                <property name="spacing">8</property>
-                <property name="homogeneous">True</property>
-                <child>
-                  <object class="GtkLabel">
-                    <property name="visible">True</property>
-                    <property name="can-focus">False</property>
-                    <property name="label" translatable="yes">Hexagon Address</property>
-                  </object>
-                </child>
-                <child>
-                  <object class="GtkLabel" id="hex_address">
-                    <property name="visible">True</property>
-                    <property name="can-focus">False</property>
-                    <property name="margin-start">4</property>
-                    <property name="margin-end">4</property>
-                    <property name="margin-top">4</property>
-                    <property name="margin-bottom">4</property>
-                    <property name="label" translatable="yes">-----</property>
-                  </object>
-                </child>
-              </object>
-            </child>
-            <child>
-              <placeholder/>
-            </child>
-            <child>
-              <placeholder/>
-            </child>
-          </object>
-        </child>
-      </object>
-    </child>
-  </template>
-</interface>

hex-grid/resources/resources.gresources.xml

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <gresources>
     <gresource prefix="/com/luminescent-dreams/hex-grid/">
-        <file>main.glade</file>
         <file>terrain.ppm</file>
         <file>map.txt</file>
     </gresource>

hex-grid/src/labeled_field.rs

@@ -0,0 +1,39 @@
+use glib::Object;
+use gtk::{prelude::*, subclass::prelude::*};
+
+#[derive(Default)]
+pub struct LabeledFieldPrivate {
+    value: gtk::Label,
+}
+
+#[glib::object_subclass]
+impl ObjectSubclass for LabeledFieldPrivate {
+    const NAME: &'static str = "LabeledField";
+    type Type = LabeledField;
+    type ParentType = gtk::Box;
+}
+
+impl ObjectImpl for LabeledFieldPrivate {}
+impl WidgetImpl for LabeledFieldPrivate {}
+impl BoxImpl for LabeledFieldPrivate {}
+
+glib::wrapper! {
+    pub struct LabeledField(ObjectSubclass<LabeledFieldPrivate>) @extends gtk::Box, gtk::Widget;
+}
+
+impl LabeledField {
+    pub fn new(label: &str, default_value: &str) -> Self {
+        let field: Self = Object::builder().build();
+        field.set_hexpand(true);
+        field.set_spacing(8);
+        field.set_homogeneous(true);
+        field.append(&gtk::Label::new(Some(label)));
+        field.append(&field.imp().value);
+        field.imp().value.set_label(default_value);
+        field
+    }
+
+    pub fn set_value(&self, value: &str) {
+        self.imp().value.set_label(value);
+    }
+}

hex-grid/src/main.rs

@@ -10,92 +10,24 @@ Luminescent Dreams Tools is distributed in the hope that it will be useful, but
 You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
 */
 
-use cairo::{Context, Path};
+use cairo::Context;
 use coordinates::{hex_map::parse_data, AxialAddr};
 use gio::resources_lookup_data;
 use glib::{subclass::InitializingObject, Object};
-use gtk::{
+use gtk::{gio, prelude::*, subclass::prelude::*, Application, DrawingArea};
-    gdk_pixbuf::Pixbuf, gio, prelude::*, subclass::prelude::*, Application, CompositeTemplate,
+use image::io::Reader as ImageReader;
-    DrawingArea, Label,
-};
-use image::{io::Reader as ImageReader, DynamicImage};
 use std::{cell::RefCell, io::Cursor, rc::Rc};
 
+mod labeled_field;
+mod palette_entry;
+mod tile;
+mod utilities;
+
 const APP_ID: &'static str = "com.luminescent-dreams.hex-grid";
 const HEX_RADIUS: f64 = 50.;
 const MAP_RADIUS: usize = 3;
 const DRAWING_ORIGIN: (f64, f64) = (1024. / 2., 768. / 2.);
 
-#[derive(Clone, Debug)]
-enum Terrain {
-    Empty,
-    Mountain,
-    Grasslands,
-    ShallowWater,
-    DeepWater,
-    Badlands,
-    Desert,
-    Swamp,
-}
-
-impl Default for Terrain {
-    fn default() -> Self {
-        Self::Empty
-    }
-}
-
-impl From<&str> for Terrain {
-    fn from(s: &str) -> Self {
-        match s {
-            "m" => Self::Mountain,
-            "g" => Self::Grasslands,
-            "sw" => Self::ShallowWater,
-            "dw" => Self::DeepWater,
-            "b" => Self::Badlands,
-            "d" => Self::Desert,
-            "s" => Self::Swamp,
-            _ => Self::Empty,
-        }
-    }
-}
-
-impl From<String> for Terrain {
-    fn from(s: String) -> Self {
-        Self::from(s.as_ref())
-    }
-}
-
-struct Tile {
-    terrain: Terrain,
-    image: Pixbuf,
-}
-
-impl Tile {
-    fn new(source: &DynamicImage, terrain: Terrain) -> Tile {
-        let image = match terrain {
-            Terrain::DeepWater => pixbuf_from_image_tile(source.clone().crop(0, 0, 100, 88)),
-            Terrain::ShallowWater => pixbuf_from_image_tile(source.clone().crop(100, 0, 100, 88)),
-            Terrain::Grasslands => pixbuf_from_image_tile(source.clone().crop(200, 0, 100, 88)),
-            Terrain::Desert => pixbuf_from_image_tile(source.clone().crop(300, 0, 100, 88)),
-            Terrain::Mountain => pixbuf_from_image_tile(source.clone().crop(0, 88, 100, 88)),
-            Terrain::Badlands => pixbuf_from_image_tile(source.clone().crop(100, 88, 100, 88)),
-            Terrain::Swamp => pixbuf_from_image_tile(source.clone().crop(0, 176, 100, 88)),
-            Terrain::Empty => pixbuf_from_image_tile(source.clone().crop(300, 176, 100, 88)),
-        };
-
-        Tile { terrain, image }
-    }
-
-    fn render_on_context(&self, context: &Context, translate_x: f64, translate_y: f64) {
-        context.save().unwrap();
-        context.append_path(&hexagon_path(context, translate_x, translate_y, 100., 88.));
-        context.clip();
-        context.set_source_pixbuf(&self.image, translate_x, translate_y);
-        context.paint().expect("paint should succeed");
-        context.restore().unwrap();
-    }
-}
-
 fn main() {
     gio::resources_register_include!("com.luminescent-dreams.hex-grid.gresource")
         .expect("Failed to register resources");
@@ -110,15 +42,13 @@ fn main() {
     app.run();
 }
 
-#[derive(CompositeTemplate, Default)]
-#[template(resource = "/com/luminescent-dreams/hex-grid/main.glade")]
 pub struct HexGridWindowPrivate {
-    #[template_child]
+    layout: gtk::Box,
-    pub drawing_area: TemplateChild<DrawingArea>,
+    palette: gtk::Box,
-    #[template_child]
+
-    pub hex_address: TemplateChild<Label>,
+    drawing_area: DrawingArea,
-    #[template_child]
+    hex_address: labeled_field::LabeledField,
-    pub canvas_address: TemplateChild<Label>,
+    canvas_address: labeled_field::LabeledField,
 
     current_coordinate: Rc<RefCell<Option<AxialAddr>>>,
 }
@@ -129,17 +59,71 @@ impl ObjectSubclass for HexGridWindowPrivate {
     type Type = HexGridWindow;
     type ParentType = gtk::ApplicationWindow;
 
-    fn class_init(c: &mut Self::Class) {
+    fn new() -> Self {
-        c.bind_template();
+        println!("hexGridWindowPrivate::new()");
-    }
+        let current_coordinate = Rc::new(RefCell::new(None));
 
-    fn instance_init(obj: &InitializingObject<Self>) {
+        let drawing_area = DrawingArea::builder()
-        obj.init_template();
+            .width_request(1024)
+            .height_request(768)
+            .margin_start(8)
+            .margin_end(8)
+            .margin_top(8)
+            .margin_bottom(8)
+            .hexpand(true)
+            .build();
+
+        let layout = gtk::Box::builder()
+            .homogeneous(false)
+            .spacing(8)
+            .can_focus(false)
+            .visible(true)
+            .build();
+
+        let sidebar = gtk::Box::builder()
+            .orientation(gtk::Orientation::Vertical)
+            .width_request(100)
+            .visible(true)
+            .can_focus(false)
+            .margin_start(4)
+            .margin_end(4)
+            .margin_top(4)
+            .margin_bottom(4)
+            .spacing(8)
+            .build();
+
+        let canvas_address = labeled_field::LabeledField::new("Canvas Address", "-----");
+        let hex_address = labeled_field::LabeledField::new("Hex Address", "-----");
+
+        let palette = gtk::Box::builder()
+            .spacing(8)
+            .orientation(gtk::Orientation::Vertical)
+            .hexpand(true)
+            .build();
+
+        sidebar.append(&canvas_address);
+        sidebar.append(&hex_address);
+        sidebar.append(&palette);
+
+        layout.append(&drawing_area);
+        layout.append(&sidebar);
+
+        layout.show();
+
+        Self {
+            drawing_area,
+            hex_address,
+            canvas_address,
+            current_coordinate,
+            layout,
+            palette,
+        }
     }
 }
 
 impl ObjectImpl for HexGridWindowPrivate {
     fn constructed(&self) {
+        println!("HexGridWindowPrivate::constructed()");
         self.parent_constructed();
 
         let map_text_resource = resources_lookup_data(
@@ -149,7 +133,8 @@ impl ObjectImpl for HexGridWindowPrivate {
         .expect("map should be in the bundle")
         .to_vec();
 
-        let hex_map = parse_data::<Terrain>(String::from_utf8(map_text_resource).unwrap().lines());
+        let hex_map =
+            parse_data::<tile::Terrain>(String::from_utf8(map_text_resource).unwrap().lines());
 
         let terrain_data = resources_lookup_data(
             "/com/luminescent-dreams/hex-grid/terrain.ppm",
@@ -161,13 +146,28 @@ impl ObjectImpl for HexGridWindowPrivate {
             .unwrap();
 
         let image = reader.decode().unwrap();
-        let deep_water = Tile::new(&image, Terrain::DeepWater);
+        let badlands = tile::Tile::new(&image, tile::Terrain::Badlands);
-        let shallow_water = Tile::new(&image, Terrain::ShallowWater);
+        let deep_water = tile::Tile::new(&image, tile::Terrain::DeepWater);
-        let grasslands = Tile::new(&image, Terrain::Grasslands);
+        let desert = tile::Tile::new(&image, tile::Terrain::Desert);
-        let desert = Tile::new(&image, Terrain::Desert);
+        let grasslands = tile::Tile::new(&image, tile::Terrain::Grasslands);
-        let mountain = Tile::new(&image, Terrain::Mountain);
+        let mountain = tile::Tile::new(&image, tile::Terrain::Mountain);
-        let badlands = Tile::new(&image, Terrain::Badlands);
+        let shallow_water = tile::Tile::new(&image, tile::Terrain::ShallowWater);
-        let swamp = Tile::new(&image, Terrain::Swamp);
+        let swamp = tile::Tile::new(&image, tile::Terrain::Swamp);
+
+        self.palette
+            .append(&palette_entry::PaletteEntry::new(&badlands));
+        self.palette
+            .append(&palette_entry::PaletteEntry::new(&deep_water));
+        self.palette
+            .append(&palette_entry::PaletteEntry::new(&desert));
+        self.palette
+            .append(&palette_entry::PaletteEntry::new(&grasslands));
+        self.palette
+            .append(&palette_entry::PaletteEntry::new(&mountain));
+        self.palette
+            .append(&palette_entry::PaletteEntry::new(&shallow_water));
+        self.palette
+            .append(&palette_entry::PaletteEntry::new(&swamp));
 
         let motion_controller = gtk::EventControllerMotion::new();
         {
@@ -182,13 +182,13 @@ impl ObjectImpl for HexGridWindowPrivate {
 
                 let (q, r) = axial_round(q, r);
                 let coordinate = AxialAddr::new(q, r);
-                canvas_address.set_label(&format!("{:.0} {:.0}", x, y));
+                canvas_address.set_value(&format!("{:.0} {:.0}", x, y));
 
                 if coordinate.distance(&AxialAddr::origin()) > MAP_RADIUS {
-                    hex_address.set_label(&format!("-----"));
+                    hex_address.set_value(&format!("-----"));
                     *c.borrow_mut() = None;
                 } else {
-                    hex_address.set_label(&format!("{:.0} {:.0}", coordinate.q(), coordinate.r()));
+                    hex_address.set_value(&format!("{:.0} {:.0}", coordinate.q(), coordinate.r()));
                     *c.borrow_mut() = Some(coordinate);
                 }
             });
@@ -201,16 +201,6 @@ impl ObjectImpl for HexGridWindowPrivate {
 
                 context.set_line_width(2.);
 
-                /*
-                deep_water.render_on_context(&context, 0., 0.);
-                shallow_water.render_on_context(&context, 150., 0.);
-                grasslands.render_on_context(&context, 300., 0.);
-                desert.render_on_context(&context, 450., 0.);
-                mountain.render_on_context(&context, 0., 100.);
-                badlands.render_on_context(&context, 150., 100.);
-                swamp.render_on_context(&context, 0., 200.);
-                */
-
                 for coordinate in vec![AxialAddr::origin()]
                     .into_iter()
                     .chain(AxialAddr::origin().addresses(MAP_RADIUS))
@@ -225,17 +215,16 @@ impl ObjectImpl for HexGridWindowPrivate {
                     let translate_y = center_y - (3. as f64).sqrt() * HEX_RADIUS / 2.;
 
                     let tile = match hex_map.get(&coordinate).unwrap() {
-                        Terrain::Mountain => &mountain,
+                        tile::Terrain::Mountain => &mountain,
-                        Terrain::Grasslands => &grasslands,
+                        tile::Terrain::Grasslands => &grasslands,
-                        Terrain::ShallowWater => &shallow_water,
+                        tile::Terrain::ShallowWater => &shallow_water,
-                        Terrain::DeepWater => &deep_water,
+                        tile::Terrain::DeepWater => &deep_water,
-                        Terrain::Badlands => &badlands,
+                        tile::Terrain::Badlands => &badlands,
-                        Terrain::Desert => &desert,
+                        tile::Terrain::Desert => &desert,
-                        Terrain::Swamp => &swamp,
+                        tile::Terrain::Swamp => &swamp,
                         _ => panic!("unhandled terrain type"),
                     };
                     tile.render_on_context(context, translate_x, translate_y);
-                    // draw_hexagon(context, center_x, center_y, HEX_RADIUS);
                 }
             });
         }
@@ -254,14 +243,16 @@ glib::wrapper! {
 
 impl HexGridWindow {
     pub fn new(app: &Application) -> Self {
-        Object::builder().property("application", app).build()
+        let window: Self = Object::builder().property("application", app).build();
+        window.set_child(Some(&window.imp().layout));
+        window
     }
 }
 
 fn draw_hexagon(context: &Context, center_x: f64, center_y: f64, radius: f64) {
     let ul_x = center_x - radius;
     let ul_y = center_y - (3. as f64).sqrt() * radius / 2.;
-    let points: Vec<(f64, f64)> = hexagon(radius * 2., (3. as f64).sqrt() * radius);
+    let points: Vec<(f64, f64)> = utilities::hexagon(radius * 2., (3. as f64).sqrt() * radius);
     context.new_path();
     context.move_to(ul_x + points[0].0, ul_y + points[0].1);
     context.line_to(ul_x + points[1].0, ul_y + points[1].1);
@@ -272,51 +263,6 @@ fn draw_hexagon(context: &Context, center_x: f64, center_y: f64, radius: f64) {
     context.close_path();
 }
 
-fn hexagon_path(
-    context: &Context,
-    translate_x: f64,
-    translate_y: f64,
-    width: f64,
-    height: f64,
-) -> Path {
-    context.new_path();
-    let points = hexagon(width, height);
-    context.move_to(translate_x + points[0].0, translate_y + points[0].1);
-    context.line_to(translate_x + points[1].0, translate_y + points[1].1);
-    context.line_to(translate_x + points[2].0, translate_y + points[2].1);
-    context.line_to(translate_x + points[3].0, translate_y + points[3].1);
-    context.line_to(translate_x + points[4].0, translate_y + points[4].1);
-    context.line_to(translate_x + points[5].0, translate_y + points[5].1);
-    context.copy_path().expect("to successfully copy a path")
-}
-
-fn hexagon(width: f64, height: f64) -> Vec<(f64, f64)> {
-    let center_x = width / 2.;
-    let center_y = height / 2.;
-    let radius = width / 2.;
-
-    vec![
-        (center_x + radius, center_y),
-        (
-            center_x + radius / 2.,
-            center_y + (3. as f64).sqrt() * radius / 2.,
-        ),
-        (
-            center_x - radius / 2.,
-            center_y + (3. as f64).sqrt() * radius / 2.,
-        ),
-        (center_x - radius, center_y),
-        (
-            center_x - radius / 2.,
-            center_y - (3. as f64).sqrt() * radius / 2.,
-        ),
-        (
-            center_x + radius / 2.,
-            center_y - (3. as f64).sqrt() * radius / 2.,
-        ),
-    ]
-}
-
 fn axial_round(q_f64: f64, r_f64: f64) -> (i32, i32) {
     let s_f64 = -q_f64 - r_f64;
     let mut q = q_f64.round();
@@ -334,15 +280,3 @@ fn axial_round(q_f64: f64, r_f64: f64) -> (i32, i32) {
     }
     unsafe { (q.to_int_unchecked::<i32>(), r.to_int_unchecked::<i32>()) }
 }
-
-fn pixbuf_from_image_tile(image: image::DynamicImage) -> Pixbuf {
-    Pixbuf::from_bytes(
-        &glib::Bytes::from(image.as_bytes()),
-        gtk::gdk_pixbuf::Colorspace::Rgb,
-        false,
-        8,
-        image.width() as i32,
-        image.height() as i32,
-        image.to_rgb8().sample_layout().height_stride as i32,
-    )
-}

hex-grid/src/palette_entry.rs

@@ -0,0 +1,52 @@
+use crate::tile;
+use glib::Object;
+use gtk::{prelude::*, subclass::prelude::*};
+use std::{cell::RefCell, rc::Rc};
+
+pub struct PaletteEntryPrivate {
+    terrain: Rc<RefCell<tile::Terrain>>,
+}
+
+#[glib::object_subclass]
+impl ObjectSubclass for PaletteEntryPrivate {
+    const NAME: &'static str = "PaletteEntry";
+    type Type = PaletteEntry;
+    type ParentType = gtk::ListBoxRow;
+
+    fn new() -> Self {
+        Self {
+            terrain: Rc::new(RefCell::new(tile::Terrain::Empty)),
+        }
+    }
+}
+
+impl ObjectImpl for PaletteEntryPrivate {}
+impl WidgetImpl for PaletteEntryPrivate {}
+impl ListBoxRowImpl for PaletteEntryPrivate {
+    fn activate(&self) {
+        println!("row activated: {:?}", self.terrain);
+    }
+}
+
+glib::wrapper! {
+    pub struct PaletteEntry(ObjectSubclass<PaletteEntryPrivate>) @extends gtk::ListBoxRow, gtk::Widget;
+}
+
+impl PaletteEntry {
+    pub fn new(tile: &tile::Tile) -> Self {
+        let row: Self = Object::builder().build();
+        *row.imp().terrain.borrow_mut() = tile.terrain.clone();
+        let layout = gtk::Box::builder().spacing(8).build();
+
+        let image = gtk::Image::from_pixbuf(Some(&tile.image));
+        image.set_width_request(100);
+        image.set_height_request(88);
+
+        layout.append(&image);
+        layout.append(&gtk::Label::new(Some(&String::from(&tile.terrain))));
+
+        row.set_child(Some(&layout));
+
+        row
+    }
+}

hex-grid/src/tile.rs

@@ -0,0 +1,108 @@
+use crate::utilities;
+use cairo::Context;
+use gtk::{gdk_pixbuf::Pixbuf, prelude::*};
+use image::DynamicImage;
+
+#[derive(Clone, Debug)]
+pub enum Terrain {
+    Badlands,
+    DeepWater,
+    Desert,
+    Empty,
+    Grasslands,
+    Mountain,
+    ShallowWater,
+    Swamp,
+}
+
+impl Default for Terrain {
+    fn default() -> Self {
+        Self::Empty
+    }
+}
+
+impl From<&str> for Terrain {
+    fn from(s: &str) -> Self {
+        match s {
+            "m" => Self::Mountain,
+            "g" => Self::Grasslands,
+            "sw" => Self::ShallowWater,
+            "dw" => Self::DeepWater,
+            "b" => Self::Badlands,
+            "d" => Self::Desert,
+            "s" => Self::Swamp,
+            _ => Self::Empty,
+        }
+    }
+}
+
+impl From<String> for Terrain {
+    fn from(s: String) -> Self {
+        Self::from(s.as_ref())
+    }
+}
+
+impl From<&Terrain> for String {
+    fn from(t: &Terrain) -> Self {
+        match t {
+            Terrain::Badlands => "Badlands",
+            Terrain::DeepWater => "Deep Water",
+            Terrain::Desert => "Desert",
+            Terrain::Empty => "Empty",
+            Terrain::Grasslands => "Grasslands",
+            Terrain::Mountain => "Mountain",
+            Terrain::ShallowWater => "Shallow Water",
+            Terrain::Swamp => "Swamp",
+        }
+        .to_owned()
+    }
+}
+
+pub struct Tile {
+    pub terrain: Terrain,
+    pub image: Pixbuf,
+}
+
+impl Tile {
+    pub fn new(source: &DynamicImage, terrain: Terrain) -> Tile {
+        let image = match terrain {
+            Terrain::DeepWater => pixbuf_from_image_tile(source.clone().crop(0, 0, 100, 88)),
+            Terrain::ShallowWater => pixbuf_from_image_tile(source.clone().crop(100, 0, 100, 88)),
+            Terrain::Grasslands => pixbuf_from_image_tile(source.clone().crop(200, 0, 100, 88)),
+            Terrain::Desert => pixbuf_from_image_tile(source.clone().crop(300, 0, 100, 88)),
+            Terrain::Mountain => pixbuf_from_image_tile(source.clone().crop(0, 88, 100, 88)),
+            Terrain::Badlands => pixbuf_from_image_tile(source.clone().crop(100, 88, 100, 88)),
+            Terrain::Swamp => pixbuf_from_image_tile(source.clone().crop(0, 176, 100, 88)),
+            Terrain::Empty => pixbuf_from_image_tile(source.clone().crop(300, 176, 100, 88)),
+        };
+
+        Tile { terrain, image }
+    }
+
+    pub fn render_on_context(&self, context: &Context, translate_x: f64, translate_y: f64) {
+        context.save().unwrap();
+        context.append_path(&utilities::hexagon_path(
+            context,
+            translate_x,
+            translate_y,
+            100.,
+            88.,
+        ));
+        context.clip();
+        context.set_source_pixbuf(&self.image, translate_x, translate_y);
+        context.paint().expect("paint should succeed");
+        context.restore().unwrap();
+    }
+}
+
+fn pixbuf_from_image_tile(image: image::DynamicImage) -> Pixbuf {
+    Pixbuf::from_bytes(
+        &glib::Bytes::from(image.as_bytes()),
+        gtk::gdk_pixbuf::Colorspace::Rgb,
+        false,
+        8,
+        image.width() as i32,
+        image.height() as i32,
+        image.to_rgb8().sample_layout().height_stride as i32,
+    )
+}

hex-grid/src/utilities.rs

@@ -0,0 +1,46 @@
+use cairo::{Context, Path};
+
+pub fn hexagon_path(
+    context: &Context,
+    translate_x: f64,
+    translate_y: f64,
+    width: f64,
+    height: f64,
+) -> Path {
+    context.new_path();
+    let points = hexagon(width, height);
+    context.move_to(translate_x + points[0].0, translate_y + points[0].1);
+    context.line_to(translate_x + points[1].0, translate_y + points[1].1);
+    context.line_to(translate_x + points[2].0, translate_y + points[2].1);
+    context.line_to(translate_x + points[3].0, translate_y + points[3].1);
+    context.line_to(translate_x + points[4].0, translate_y + points[4].1);
+    context.line_to(translate_x + points[5].0, translate_y + points[5].1);
+    context.copy_path().expect("to successfully copy a path")
+}
+
+pub fn hexagon(width: f64, height: f64) -> Vec<(f64, f64)> {
+    let center_x = width / 2.;
+    let center_y = height / 2.;
+    let radius = width / 2.;
+
+    vec![
+        (center_x + radius, center_y),
+        (
+            center_x + radius / 2.,
+            center_y + (3. as f64).sqrt() * radius / 2.,
+        ),
+        (
+            center_x - radius / 2.,
+            center_y + (3. as f64).sqrt() * radius / 2.,
+        ),
+        (center_x - radius, center_y),
+        (
+            center_x - radius / 2.,
+            center_y - (3. as f64).sqrt() * radius / 2.,
+        ),
+        (
+            center_x + radius / 2.,
+            center_y - (3. as f64).sqrt() * radius / 2.,
+        ),
+    ]
+}