restructuring, keeping objects inside bounding box

7 years ago · fe586f841a
parent 91b35cba12
commit fe586f841a
4 changed files with 42 additions and 18 deletions
--- a/resources/public/index.html
+++ b/resources/public/index.html
@ -4,7 +4,8 @@
        
    </head>
    <body>
-        <canvas id="gamecanvas" height="400" width="600"></canvas>
+        <canvas id="gamecanvas" height="400" width="600"
+            style="border: 1px solid black"></canvas>
        <script src="js/cljsbuild-main.js"></script>
    </body>
 </html>
--- a/src/cljs/topdown2d/core.cljs
+++ b/src/cljs/topdown2d/core.cljs
@ -13,7 +13,10 @@
    :now 0
    :fps 0
  }
-  :keys []
+  :dimensions {
+    :w 600
+    :h 400
+  }
  :scene :demo
  :scenes {
    :demo {
@ -54,7 +57,10 @@
    (update-scene)))

 (defn draw-step [gamestate]
-  (.clearRect (:2d gamestate) 0 0 400 600)
+  (.clearRect (:2d gamestate)
+    0 0
+    (get-in gamestate [:dimensions :w])
+    (get-in gamestate [:dimensions :h]))
  (.fillText
    (:2d gamestate)
    (int (get-in gamestate [:timing :fps]))
--- a/src/cljs/topdown2d/demoscene.cljs
+++ b/src/cljs/topdown2d/demoscene.cljs
@ -23,6 +23,9 @@
        :h 10
        :v 5
        :d :?
+        :keep-in (assoc (:dimensions gamestate)
+          :x 0
+          :y 0)
      }
    }))

--- a/src/cljs/topdown2d/objects.cljs
+++ b/src/cljs/topdown2d/objects.cljs
@ -1,18 +1,32 @@
 (ns topdown2d.objects)

+(defn in? [obj box]
+  (let [{:keys [x y w h]} obj
+        {bx :x by :y bw :w bh :h} box]
+    (println obj x)
+    (and
+      (> x bx)
+      (> y by)
+      (< (+ x w) (+ bx bw))
+      (< (+ y h) (+ by bh)))))
+
 (defn move [obj]
-  (let [{:keys [x y v d]} obj]
-    (cond
-      (= d :w)
-        (assoc obj
-          :x (- x v))
-      (= d :e)
-        (assoc obj
-          :x (+ x v))
-      (= d :n)
-        (assoc obj
-          :y (- y v))
-      (= d :s)
-        (assoc obj
-          :y (+ y v))
-      :else obj)))
+  (let [{:keys [x y v d]} obj
+        moved (cond
+                (= d :w)
+                  (assoc obj
+                    :x (- x v))
+                (= d :e)
+                  (assoc obj
+                    :x (+ x v))
+                (= d :n)
+                  (assoc obj
+                    :y (- y v))
+                (= d :s)
+                  (assoc obj
+                    :y (+ y v))
+                :else obj)
+        keep-in (:keep-in obj)]
+    (if (or (nil? keep-in) (and keep-in (in? moved keep-in)))
+      moved
+      obj)))