Huge performance improvement when translating quest entities.

src/data_formats/vector.ts

@@ -7,7 +7,13 @@ export class Vec2 {
         this.y = y;
     }
 
-    add(v: Vec2): Vec2 {
+    set(x: number, y: number): this {
+        this.x = x;
+        this.y = y;
+        return this;
+    }
+
+    add(v: Vec2): this {
         this.x += v.x;
         this.y += v.y;
         return this;
@@ -33,7 +39,14 @@ export class Vec3 {
         this.z = z;
     }
 
-    add(v: Vec3): Vec3 {
+    set(x: number, y: number, z: number): this {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+        return this;
+    }
+
+    add(v: Vec3): this {
         this.x += v.x;
         this.y += v.y;
         this.z += v.z;

src/domain/NpcType.ts

@@ -1,6 +1,6 @@
-import { Episode, check_episode } from ".";
+import { Episode, check_episode, EntityType } from ".";
 
-export class NpcType {
+export class NpcType implements EntityType {
     readonly id: number;
     /**
      * Matches the constant name. E.g. the code of NpcType.Zu is "Zu".

src/domain/index.ts

@@ -1,4 +1,4 @@
-import { computed, observable } from "mobx";
+import { computed, observable, action } from "mobx";
 import { DatNpc, DatObject, DatUnknown } from "../data_formats/parsing/quest/dat";
 import { Vec3 } from "../data_formats/vector";
 import { enum_values } from "../enums";
@@ -127,10 +127,18 @@ export class Quest {
     }
 }
 
+export interface EntityType {
+    readonly id: number;
+    readonly code: string;
+    readonly name: string;
+}
+
 /**
  * Abstract class from which QuestNpc and QuestObject derive.
  */
-export class QuestEntity {
+export class QuestEntity<Type extends EntityType = EntityType> {
+    readonly type: Type;
+
     @observable area_id: number;
 
     private _section_id: number;
@@ -139,14 +147,14 @@ export class QuestEntity {
         return this.section ? this.section.id : this._section_id;
     }
 
-    @observable section?: Section;
+    @observable.ref section?: Section;
 
     /**
      * World position
      */
-    @observable position: Vec3;
+    @observable.ref position: Vec3;
 
-    @observable rotation: Vec3;
+    @observable.ref rotation: Vec3;
 
     /**
      * Section-relative position
@@ -185,9 +193,10 @@ export class QuestEntity {
         }
     }
 
-    constructor(area_id: number, section_id: number, position: Vec3, rotation: Vec3) {
+    constructor(type: Type, area_id: number, section_id: number, position: Vec3, rotation: Vec3) {
         if (Object.getPrototypeOf(this) === Object.getPrototypeOf(QuestEntity))
             throw new Error("Abstract class should not be instantiated directly.");
+        if (!type) throw new Error("type is required.");
         if (!Number.isInteger(area_id) || area_id < 0)
             throw new Error(`Expected area_id to be a non-negative integer, got ${area_id}.`);
         if (!Number.isInteger(section_id) || section_id < 0)
@@ -195,14 +204,21 @@ export class QuestEntity {
         if (!position) throw new Error("position is required.");
         if (!rotation) throw new Error("rotation is required.");
 
+        this.type = type;
         this.area_id = area_id;
         this._section_id = section_id;
         this.position = position;
         this.rotation = rotation;
     }
+
+    @action
+    set_position_and_section(position: Vec3, section?: Section): void {
+        this.position = position;
+        this.section = section;
+    }
 }
 
-export class QuestObject extends QuestEntity {
+export class QuestObject extends QuestEntity<ObjectType> {
     @observable type: ObjectType;
     /**
      * The raw data from a DAT file.
@@ -217,16 +233,14 @@ export class QuestObject extends QuestEntity {
         type: ObjectType,
         dat: DatObject
     ) {
-        super(area_id, section_id, position, rotation);
-
-        if (!type) throw new Error("type is required.");
+        super(type, area_id, section_id, position, rotation);
 
         this.type = type;
         this.dat = dat;
     }
 }
 
-export class QuestNpc extends QuestEntity {
+export class QuestNpc extends QuestEntity<NpcType> {
     @observable type: NpcType;
     /**
      * The raw data from a DAT file.
@@ -241,7 +255,7 @@ export class QuestNpc extends QuestEntity {
         type: NpcType,
         dat: DatNpc
     ) {
-        super(area_id, section_id, position, rotation);
+        super(type, area_id, section_id, position, rotation);
 
         if (!type) throw new Error("type is required.");
 
@@ -270,7 +284,7 @@ export class Area {
 }
 
 export class AreaVariant {
-    @observable sections: Section[] = [];
+    @observable.shallow sections: Section[] = [];
 
     constructor(public id: number, public area: Area) {
         if (!Number.isInteger(id) || id < 0)

src/rendering/QuestEntityControls.ts

@@ -1,4 +1,4 @@
-import { autorun, runInAction } from "mobx";
+import { autorun } from "mobx";
 import { Intersection, Mesh, MeshLambertMaterial, Plane, Raycaster, Vector2, Vector3 } from "three";
 import { Vec3 } from "../data_formats/vector";
 import { QuestEntity, QuestNpc, QuestObject, Section } from "../domain";
@@ -239,14 +239,14 @@ export class QuestEntityControls {
         const { intersection, section } = this.pick_terrain(pointer_position, pick);
 
         if (intersection) {
-            runInAction(() => {
-                selection.entity.position = new Vec3(
+            selection.entity.set_position_and_section(
+                new Vec3(
                     intersection.point.x,
                     intersection.point.y + pick.drag_y,
                     intersection.point.z
-                );
-                selection.entity.section = section;
-            });
+                ),
+                section
+            );
         } else {
             // If the cursor is not over any terrain, we translate the entity accross the horizontal plane in which the entity's origin lies.
             this.raycaster.setFromCamera(pointer_position, this.renderer.camera);

src/ui/quest_editor/EntityInfoComponent.tsx

@@ -1,8 +1,10 @@
 import { InputNumber } from "antd";
 import { observer } from "mobx-react";
-import React, { ReactNode, Component } from "react";
+import React, { ReactNode, Component, PureComponent } from "react";
 import { QuestNpc, QuestObject, QuestEntity } from "../../domain";
 import "./EntityInfoComponent.css";
+import { IReactionDisposer, autorun } from "mobx";
+import { Vec3 } from "../../data_formats/vector";
 
 export type Props = {
     entity?: QuestEntity;
@@ -104,30 +106,71 @@ export class EntityInfoComponent extends Component<Props> {
     }
 }
 
-@observer
-class CoordRow extends Component<{
+type CoordProps = {
     entity: QuestEntity;
     position_type: "position" | "section_position";
     coord: "x" | "y" | "z";
-}> {
+};
+
+class CoordRow extends PureComponent<CoordProps> {
     render(): ReactNode {
-        const entity = this.props.entity;
-        const value = entity[this.props.position_type][this.props.coord];
         return (
             <tr>
                 <td>{this.props.coord.toUpperCase()}: </td>
                 <td>
-                    <InputNumber
-                        value={value}
-                        size="small"
-                        precision={3}
-                        className="EntityInfoComponent-coord"
-                        onChange={this.changed}
-                    />
+                    <CoordInput {...this.props} />
                 </td>
             </tr>
         );
     }
+}
+
+class CoordInput extends Component<CoordProps, { value: number }> {
+    private disposer?: IReactionDisposer;
+
+    state = { value: 0 };
+
+    componentDidMount(): void {
+        this.start_observing();
+    }
+
+    componentWillUnmount(): void {
+        if (this.disposer) this.disposer();
+    }
+
+    componentDidUpdate(prev_props: CoordProps): void {
+        if (this.props.entity !== prev_props.entity) {
+            this.start_observing();
+        }
+    }
+
+    render(): ReactNode {
+        return (
+            <InputNumber
+                value={this.state.value}
+                size="small"
+                precision={3}
+                className="EntityInfoComponent-coord"
+                onChange={this.changed}
+            />
+        );
+    }
+
+    private start_observing() {
+        if (this.disposer) this.disposer();
+
+        this.disposer = autorun(
+            () => {
+                this.setState({
+                    value: this.props.entity[this.props.position_type][this.props.coord],
+                });
+            },
+            {
+                name: `${this.props.entity.type.code}.${this.props.position_type}.${this.props.coord} changed`,
+                delay: 50,
+            }
+        );
+    }
 
     private changed = (value?: number) => {
         if (value != null) {