From 02c34c4f2537386fb1087c1fb3528f96011a54e0 Mon Sep 17 00:00:00 2001
From: tom barrett <spalf0@gmail.com>
Date: Sun, 16 Jun 2019 12:26:06 -0500
Subject: movement of camera

---
 src/constants.rs |  1 +
 src/main.rs      | 21 ++++++++++++++++++---
 src/map.rs       | 35 ++++++++++++++++-------------------
 3 files changed, 35 insertions(+), 22 deletions(-)

(limited to 'src')

diff --git a/src/constants.rs b/src/constants.rs
index 8276340..dd61e38 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -1 +1,2 @@
 pub const TILE_SCALE: f32 = 3.0;
+pub const CAMERA_MOVE: f32 = 5.0;
diff --git a/src/main.rs b/src/main.rs
index 953d326..eaafa88 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,5 @@
 use ggez::conf::Conf;
-use ggez::event::{self, EventHandler};
+use ggez::event::{self, EventHandler, KeyCode, KeyMods};
 use ggez::filesystem;
 use ggez::graphics::{self, spritebatch::SpriteBatch, DrawParam, FilterMode, Image};
 use ggez::nalgebra::{Point2, Vector2};
@@ -12,6 +12,7 @@ struct State {
     map: Map,
     tileset: Tileset,
     spritebatch: SpriteBatch,
+    camera_point: (f32, f32),
 }
 
 impl State {
@@ -23,12 +24,13 @@ impl State {
             map: Map::new(filesystem::open(context, "/map.tmx")?),
             tileset: Tileset::new(filesystem::open(context, "/tileset.tsx")?),
             spritebatch: SpriteBatch::new(image),
+            camera_point: (0.0, 0.0),
         })
     }
 }
 
 impl EventHandler for State {
-    fn update(&mut self, _context: &mut Context) -> GameResult {
+    fn update(&mut self, _: &mut Context) -> GameResult {
         Ok(())
     }
 
@@ -51,12 +53,25 @@ impl EventHandler for State {
             }
         }
 
-        graphics::draw(context, &self.spritebatch, DrawParam::default())?;
+        let draw_param =
+            DrawParam::default().dest(Point2::new(self.camera_point.0, self.camera_point.1));
+
+        graphics::draw(context, &self.spritebatch, draw_param)?;
         self.spritebatch.clear();
 
         graphics::present(context)?;
         Ok(())
     }
+
+    fn key_down_event(&mut self, _: &mut Context, keycode: KeyCode, _: KeyMods, _: bool) {
+        match keycode {
+            KeyCode::W => self.camera_point.1 += constants::CAMERA_MOVE,
+            KeyCode::A => self.camera_point.0 += constants::CAMERA_MOVE,
+            KeyCode::S => self.camera_point.1 -= constants::CAMERA_MOVE,
+            KeyCode::D => self.camera_point.0 -= constants::CAMERA_MOVE,
+            _ => (),
+        }
+    }
 }
 
 fn main() -> GameResult {
diff --git a/src/map.rs b/src/map.rs
index db79deb..ed90f1a 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -2,24 +2,6 @@ use ggez::filesystem::File;
 use std::io::BufReader;
 use xml::reader::{EventReader, XmlEvent};
 
-pub struct Layer {
-    pub id: usize,
-    pub data: Vec<usize>,
-}
-
-impl Layer {
-    pub fn new(text: String, id: usize) -> Layer {
-        Layer {
-            id,
-            data: text
-                .replace("\n", "")
-                .split(',')
-                .map(|s| s.parse().unwrap())
-                .collect(),
-        }
-    }
-}
-
 pub struct Map {
     pub width: usize,
     pub height: usize,
@@ -47,7 +29,7 @@ impl Map {
                     }
                 }
             } else if let Ok(XmlEvent::Characters(text)) = e {
-                layers.push(Layer::new(text, layers.len() + 1));
+                layers.push(Layer::new(text));
             }
         }
 
@@ -59,3 +41,18 @@ impl Map {
     }
 }
 
+pub struct Layer {
+    pub data: Vec<usize>,
+}
+
+impl Layer {
+    pub fn new(text: String) -> Layer {
+        Layer {
+            data: text
+                .replace("\n", "")
+                .split(',')
+                .map(|s| s.parse().unwrap())
+                .collect(),
+        }
+    }
+}
-- 
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