titlescreen work, ui elements

src/states/titlescreen.rs

@@ -1,8 +1,9 @@
-use crate::resources::spritesheet::SpriteSheetMap;
+use crate::resources::{font::FontResource, spritesheet::SpriteSheetMap};
 use amethyst::{
     core::transform::Transform,
     prelude::*,
     renderer::{Camera, SpriteRender},
+    ui::{Anchor, UiImage, UiText, UiTransform},
     window::ScreenDimensions,
 };
 use nalgebra::Vector3;
@@ -17,6 +18,7 @@ impl TitleScreenState {
     /// initialize the titlescreen
     fn init(&self, world: &mut World, dimensions: ScreenDimensions) {
         self.init_camera(world, &dimensions);
+        self.init_ui(world);
         self.init_scenery(world, &dimensions);
     }
 
@@ -32,6 +34,62 @@ impl TitleScreenState {
             .build();
     }
 
+    fn init_ui(&self, world: &mut World) {
+        // get the font handle
+        let font_handle = {
+            if let Some(font_rsc) = world.try_fetch::<FontResource>() {
+                font_rsc.get_handle().clone()
+            } else {
+                panic!("failed to get a handle on font resource");
+            }
+        };
+
+        // create the button transforms
+        let exit_btn_transform = UiTransform::new(
+            "exit_button".into(),
+            Anchor::BottomRight,
+            Anchor::Middle,
+            -100.0,
+            50.0,
+            0.0,
+            100.0,
+            50.0,
+        );
+        let settings_btn_transform = UiTransform::new(
+            "settings_button".into(),
+            Anchor::BottomRight,
+            Anchor::Middle,
+            0.0,
+            0.0,
+            0.0,
+            200.0,
+            50.0,
+        );
+
+        // create the button ui text
+        let exit_btn_text =
+            UiText::new(font_handle.clone(), "Exit".into(), [1.0, 1.0, 1.0, 1.0], 30.0);
+        let settings_btn_text =
+            UiText::new(font_handle, "Settings".into(), [1.0, 1.0, 1.0, 1.0], 30.0);
+
+        // create ui image
+        let btn_image = UiImage::SolidColor([0.0, 0.0, 0.0, 1.0]);
+
+        // create the button
+        world
+            .create_entity()
+            .with(exit_btn_transform)
+            .with(exit_btn_text)
+            .with(btn_image.clone())
+            .build();
+        world
+            .create_entity()
+            .with(settings_btn_transform)
+            .with(settings_btn_text)
+            .with(btn_image)
+            .build();
+    }
+
     // initialize the scenery
     fn init_scenery(&self, world: &mut World, dimensions: &ScreenDimensions) {
         // create the scale vector
@@ -53,13 +111,14 @@ impl TitleScreenState {
                     .expect("could not find title_screen sprite sheet")
                     .clone()
             } else {
-                panic!("failed to find")
+                panic!("failed to get a handle on the spritesheet map")
             }
         };
 
         // create a sprite render
         let mut sprite_render = SpriteRender { sprite_sheet: spritesheet_handle, sprite_number: 2 };
 
+        // render background stuff
         world.create_entity().with(transform.clone()).with(sprite_render.clone()).build();
         sprite_render.sprite_number = 1;
         world.create_entity().with(transform.clone()).with(sprite_render.clone()).build();