Add constant signal emitters

src/js/game/items/boolean_item.js

@@ -0,0 +1,53 @@
+import { DrawParameters } from "../../core/draw_parameters";
+import { Loader } from "../../core/loader";
+import { types } from "../../savegame/serialization";
+import { BaseItem, enumItemType } from "../base_item";
+
+export class BooleanItem extends BaseItem {
+    static getId() {
+        return "boolean_item";
+    }
+
+    static getSchema() {
+        return types.uint;
+    }
+
+    serialize() {
+        return this.value;
+    }
+
+    deserialize(data) {
+        this.value = data;
+    }
+
+    getItemType() {
+        return enumItemType.boolean;
+    }
+
+    /**
+     * @param {number} value
+     */
+    constructor(value) {
+        super();
+        this.value = value ? 1 : 0;
+    }
+
+    /**
+     * @param {number} x
+     * @param {number} y
+     * @param {number} size
+     * @param {DrawParameters} parameters
+     */
+    draw(x, y, parameters, size = 12) {
+        let sprite;
+        if (this.value) {
+            sprite = Loader.getSprite("sprites/wires/boolean_true.png");
+        } else {
+            sprite = Loader.getSprite("sprites/wires/boolean_false.png");
+        }
+        sprite.drawCachedCentered(parameters, x, y, size * 1.5);
+    }
+}
+
+export const BOOL_FALSE_SINGLETON = new BooleanItem(0);
+export const BOOL_TRUE_SINGLETON = new BooleanItem(1);

src/js/game/items/negative_energy_item.js

@@ -1,37 +0,0 @@
-import { DrawParameters } from "../../core/draw_parameters";
-import { Loader } from "../../core/loader";
-import { types } from "../../savegame/serialization";
-import { BaseItem, enumItemType } from "../base_item";
-
-export class NegativeEnergyItem extends BaseItem {
-    static getId() {
-        return "negative_energy";
-    }
-
-    static getSchema() {
-        return types.uint;
-    }
-
-    serialize() {
-        return 0;
-    }
-
-    deserialize(data) {}
-
-    getItemType() {
-        return enumItemType.negativeEnergy;
-    }
-
-    /**
-     * @param {number} x
-     * @param {number} y
-     * @param {number} size
-     * @param {DrawParameters} parameters
-     */
-    draw(x, y, parameters, size = 12) {
-        const sprite = Loader.getSprite("sprites/wires/negative_energy.png");
-        sprite.drawCachedCentered(parameters, x, y, size * 1.5);
-    }
-}
-
-export const NEGATIVE_ENERGY_ITEM_SINGLETON = new NegativeEnergyItem();

src/js/game/items/positive_energy_item.js

@@ -1,37 +0,0 @@
-import { DrawParameters } from "../../core/draw_parameters";
-import { Loader } from "../../core/loader";
-import { types } from "../../savegame/serialization";
-import { BaseItem, enumItemType } from "../base_item";
-
-export class PositiveEnergyItem extends BaseItem {
-    static getId() {
-        return "positive_energy";
-    }
-
-    static getSchema() {
-        return types.uint;
-    }
-
-    serialize() {
-        return 0;
-    }
-
-    deserialize(data) {}
-
-    getItemType() {
-        return enumItemType.positiveEnergy;
-    }
-
-    /**
-     * @param {number} x
-     * @param {number} y
-     * @param {number} size
-     * @param {DrawParameters} parameters
-     */
-    draw(x, y, parameters, size = 12) {
-        const sprite = Loader.getSprite("sprites/wires/positive_energy.png");
-        sprite.drawCachedCentered(parameters, x, y, size * 1.5);
-    }
-}
-
-export const POSITIVE_ENERGY_ITEM_SINGLETON = new PositiveEnergyItem();