新增虚拟输入类 VirtualInput

source/src/Utils/Input/Virtual/VirtualIntegerAxis.ts

@@ -0,0 +1,44 @@
+module es {
+    /**
+     * 用int(-1、0或1)表示的虚拟输入。它对应的输入可以从上到下到下，
+     * 如使用两个键盘键作为正/负检查。
+     */
+    export class VirtualIntegerAxis extends VirtualInput {
+        public nodes: VirtualAxisNode[] = [];
+
+        public get value(){
+            for (let i = 0; i < this.nodes.length; i ++){
+                let val = this.nodes[i].value;
+                if (val != 0)
+                    return Math.sign(val);
+            }
+
+            return 0;
+        }
+
+        constructor(...nodes: VirtualAxisNode[]){
+            super();
+            this.nodes.concat(nodes);
+        }
+
+        public update() {
+            for (let i = 0; i < this.nodes.length; i ++)
+                this.nodes[i].update();
+        }
+
+        /**
+         * 添加键盘键来模拟这个虚拟输入的左/右或上/下
+         * @param overlapBehavior
+         * @param negative
+         * @param positive
+         */
+        public addKeyboardKeys(overlapBehavior: OverlapBehavior, negative: Keys, positive: Keys){
+            this.nodes.push(new KeyboardKeys(overlapBehavior, negative, positive));
+            return this;
+        }
+    }
+
+    export abstract class VirtualAxisNode extends VirtualInputNode {
+        public abstract value: number;
+    }
+}