add board

editor/src/App.tsx

@@ -1,7 +1,7 @@
 import { useRef, useState, type ReactElement } from "react";
 import "./style.css";
 import Canvas from "./Canvas";
-import { Editor } from "./Editor";
+import { Editor } from "./editor/Editor";
 import Toolbar from "./Toolbar";
 
 function App(): ReactElement {

editor/src/Canvas.tsx

@@ -1,5 +1,6 @@
-import { useEffect, useRef, type ReactElement, type RefObject } from "react";
+import { useEffect, type ReactElement, type RefObject } from "react";
-import { V2, type Editor } from "./Editor";
+import { type Editor } from "./editor/Editor";
+import { V2 } from "./editor/V2";
 
 type Props = { editor: Editor; canvasRef: RefObject<HTMLCanvasElement | null> };
 
@@ -30,7 +31,9 @@ function Canvas({ editor, canvasRef }: Props): ReactElement {
             editor.renderIfNeeded(ev.target as HTMLCanvasElement);
           }}
           onMouseMove={(ev) => {
-            editor.mouseMove(V2(ev.movementX, ev.movementY));
+            const deltaPos = V2(ev.movementX, ev.movementY);
+            const pos = V2(ev.nativeEvent.offsetX, ev.nativeEvent.offsetY);
+            editor.mouseMove(deltaPos, pos);
             editor.renderIfNeeded(ev.target as HTMLCanvasElement);
           }}
           onKeyDown={(ev) => {

editor/src/Editor.ts

@@ -1,303 +0,0 @@
-export type V2 = { x: number; y: number };
-export const V2 = (x: number, y: number): V2 => ({ x, y });
-
-export class Editor {
-  private cx = new Cx();
-
-  render(canvas: HTMLCanvasElement) {
-    this.cx.render(canvas);
-  }
-
-  renderIfNeeded(canvas: HTMLCanvasElement) {
-    this.cx.renderIfNeeded(canvas);
-  }
-
-  mouseDown(pos: V2) {
-    this.cx.mouseDown(pos);
-  }
-
-  mouseUp(pos: V2) {
-    this.cx.mouseUp(pos);
-  }
-
-  mouseMove(deltaPos: V2) {
-    this.cx.mouseMove(deltaPos);
-  }
-
-  keyDown(key: string) {
-    this.cx.keyDown(key);
-  }
-
-  keyUp(key: string) {
-    this.cx.keyUp(key);
-  }
-
-  selectTool(tool: Tool) {
-    this.cx.selectTool(tool);
-  }
-
-  selectedTool(): Tool | null {
-    return this.cx.selectedTool();
-  }
-
-  tools(): Tool[] {
-    return ["select", "pan", "and"];
-  }
-
-  addUpdateAction(action: () => void): object {
-    return this.cx.addUpdateAction(action);
-  }
-
-  removeUpdateAction(actionId: object) {
-    this.cx.removeUpdateAction(actionId);
-  }
-}
-
-class Cx {
-  private offset = V2(0, 0);
-  private renderNeeded = false;
-  private state = new Normal(this) as State;
-  private updateActions: (() => void)[] = [];
-  private selectionRect: SelectionRect | null = null;
-
-  render(canvas: HTMLCanvasElement) {
-    const c = canvas.getContext("2d")!;
-
-    c.imageSmoothingEnabled = false;
-    c.fillStyle = "#666";
-    c.fillRect(0, 0, canvas.width, canvas.height);
-
-    const gridSize = { x: 20, y: 20 };
-    const dotSize = { x: 2, y: 2 };
-
-    c.fillStyle = "#111";
-    for (let y = 0; y < canvas.width / gridSize.x + 1; ++y) {
-      for (let x = 0; x < canvas.height / gridSize.y + 1; ++x) {
-        c.fillRect(
-          (this.offset.x % gridSize.x) + x * gridSize.x - dotSize.x / 2,
-          (this.offset.y % gridSize.y) + y * gridSize.y - dotSize.y / 2,
-          dotSize.x,
-          dotSize.y,
-        );
-      }
-    }
-
-    if (this.selectionRect) {
-      const {
-        pos: { x, y },
-        size: { x: w, y: h },
-      } = this.selectionRect;
-
-      c.fillStyle = `#ff880088`;
-      c.fillRect(x, y, w, h);
-      c.strokeStyle = `#ff8800`;
-      c.lineWidth = 2;
-      c.strokeRect(x, y, w, h);
-    }
-  }
-
-  renderIfNeeded(canvas: HTMLCanvasElement) {
-    if (this.renderNeeded) {
-      this.render(canvas);
-      this.renderNeeded = false;
-    }
-  }
-
-  mouseDown(pos: V2) {
-    this.state.onMouseDown?.(pos);
-  }
-  mouseUp(pos: V2) {
-    this.state.onMouseUp?.(pos);
-  }
-  mouseMove(deltaPos: V2) {
-    this.state.onMouseMove?.(deltaPos);
-  }
-  keyDown(key: string) {
-    this.state.onKeyDown?.(key);
-  }
-  keyUp(key: string) {
-    this.state.onKeyUp?.(key);
-  }
-  selectTool(tool: Tool) {
-    this.state.selectTool?.(tool);
-  }
-  selectedTool(): Tool | null {
-    return this.state.selectedTool?.() ?? null;
-  }
-
-  addUpdateAction(action: () => void): object {
-    this.updateActions.push(action);
-    return action;
-  }
-
-  removeUpdateAction(actionId: object) {
-    this.updateActions = this.updateActions.filter(
-      (action) => action !== actionId,
-    );
-  }
-
-  transitionTo(newState: State) {
-    this.state = newState;
-    this.notifyListeners();
-  }
-
-  notifyListeners() {
-    for (const action of this.updateActions) {
-      action();
-    }
-  }
-
-  moveOffset(deltaPos: V2) {
-    this.offset.x += deltaPos.x;
-    this.offset.y += deltaPos.y;
-    this.renderNeeded = true;
-  }
-
-  addSelectionRect(pos: V2) {
-    this.selectionRect = { pos, size: V2(0, 0) };
-    this.renderNeeded = true;
-  }
-
-  removeSelectionRect() {
-    this.selectionRect = null;
-    this.renderNeeded = true;
-  }
-
-  moveSelectionRect(deltaPos: V2) {
-    if (this.selectionRect) {
-      this.selectionRect.size.x += deltaPos.x;
-      this.selectionRect.size.y += deltaPos.y;
-      this.renderNeeded = true;
-    }
-  }
-}
-
-interface State {
-  onMouseDown?(pos: V2): void;
-  onMouseUp?(pos: V2): void;
-  onMouseMove?(deltaPos: V2): void;
-  onKeyDown?(key: string): void;
-  onKeyUp?(key: string): void;
-  selectTool?(tool: Tool): void;
-  selectedTool?(): Tool | null;
-}
-
-class Normal implements State {
-  constructor(private cx: Cx) {}
-
-  selectTool(tool: Tool): void {
-    switch (tool) {
-      case "pan":
-        this.cx.transitionTo(new Panning(this.cx));
-        break;
-      case "and":
-        this.cx.transitionTo(new Placing(this.cx, "and"));
-    }
-  }
-
-  onMouseDown(pos: V2): void {
-    this.cx.addSelectionRect(pos);
-    this.cx.transitionTo(new Selecting(this.cx));
-  }
-
-  onKeyDown(key: string): void {
-    if (key === "Shift") {
-      this.cx.transitionTo(new Panning(this.cx));
-      return;
-    }
-  }
-
-  selectedTool(): Tool | null {
-    return "select";
-  }
-}
-
-class Panning implements State {
-  private dragging = false;
-
-  constructor(private cx: Cx) {}
-
-  onMouseDown(_pos: V2): void {
-    this.dragging = true;
-  }
-
-  onMouseUp(_pos: V2): void {
-    this.dragging = false;
-  }
-
-  onMouseMove(deltaPos: V2): void {
-    if (this.dragging) {
-      this.cx.moveOffset(deltaPos);
-    }
-  }
-
-  onKeyDown(key: string): void {
-    if (key === "Escape") {
-      this.cx.transitionTo(new Normal(this.cx));
-      return;
-    }
-  }
-
-  onKeyUp(key: string): void {
-    if (key === "Shift") {
-      this.cx.transitionTo(new Normal(this.cx));
-      return;
-    }
-  }
-
-  selectTool(tool: Tool): void {
-    this.cx.transitionTo(new Normal(this.cx));
-    this.cx.selectTool(tool);
-  }
-
-  selectedTool(): Tool | null {
-    return "pan";
-  }
-}
-
-type SelectionRect = {
-  pos: V2;
-  size: V2;
-};
-
-class Selecting implements State {
-  constructor(private cx: Cx) {}
-
-  onMouseUp(_pos: V2): void {
-    this.cx.removeSelectionRect();
-    this.cx.transitionTo(new Normal(this.cx));
-  }
-
-  onMouseMove(deltaPos: V2): void {
-    this.cx.moveSelectionRect(deltaPos);
-  }
-
-  selectedTool(): Tool | null {
-    return "select";
-  }
-}
-
-class Placing implements State {
-  constructor(
-    private cx: Cx,
-    private tool: Tool,
-  ) {}
-
-  onMouseUp(pos: V2): void {
-    this.cx.transitionTo(new Normal(this.cx));
-    console.log("place");
-  }
-
-  onKeyDown(key: string): void {
-    if (key === "Escape") {
-      this.cx.transitionTo(new Normal(this.cx));
-      return;
-    }
-  }
-
-  selectedTool(): Tool | null {
-    return this.tool;
-  }
-}
-
-type Tool = "select" | "pan" | "and";

editor/src/Toolbar.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useState, type ReactElement, type RefObject } from "react";
-import type { Editor } from "./Editor";
+import type { Editor } from "./editor/Editor";
 
 type Props = { editor: Editor; canvasRef: RefObject<HTMLCanvasElement | null> };
 

editor/src/editor/Board.ts

@@ -0,0 +1,59 @@
+import { rectsCollide, type V2 } from "./V2";
+
+export class Board {
+  private components: Component[] = [];
+
+  canPlaceComponent(pos: V2, size: V2): boolean {
+    return !this.components.some((comp) =>
+      rectsCollide(comp.pos, comp.size, pos, size),
+    );
+  }
+
+  placeComponent(pos: V2, size: V2, label: string) {
+    this.components.push({ pos, size, label });
+  }
+
+  render(
+    canvas: HTMLCanvasElement,
+    c: CanvasRenderingContext2D,
+    offset: V2,
+    gridSize: Readonly<V2>,
+  ) {
+    for (const comp of this.components) {
+      const {
+        pos: { x, y },
+        size: { x: w, y: h },
+      } = comp;
+
+      c.fillStyle = `#0088cc`;
+      c.fillRect(
+        x * gridSize.x + offset.x,
+        y * gridSize.y + offset.y,
+        w * gridSize.x,
+        h * gridSize.y,
+      );
+      c.strokeStyle = `#333333`;
+      c.lineWidth = 2;
+      c.strokeRect(
+        x * gridSize.x + offset.x,
+        y * gridSize.y + offset.y,
+        w * gridSize.x,
+        h * gridSize.y,
+      );
+      c.fillStyle = `#333333`;
+      c.font = "bold 16px monospace";
+      const textMetrix = c.measureText(comp.label);
+      c.fillText(
+        comp.label,
+        x * gridSize.x + offset.x + (w * gridSize.x) / 2 - textMetrix.width / 2,
+        y * gridSize.y + offset.y + 13 + (h * gridSize.y) / 2 - 16 / 2,
+      );
+    }
+  }
+}
+
+type Component = {
+  pos: V2;
+  size: V2;
+  label: string;
+};

editor/src/editor/Cx.ts

@@ -0,0 +1,188 @@
+import { Board } from "./Board";
+import type { State } from "./State";
+import { Normal } from "./states/Normal";
+import { V2 } from "./V2";
+
+export class Cx {
+  private offset = V2(0, 0);
+  private renderNeeded = false;
+  private state = new Normal(this) as State;
+  private updateActions: (() => void)[] = [];
+
+  public gridSize = Object.freeze(V2(20, 20));
+
+  private selectionRect: SelectionRect | null = null;
+  private componentPlacer: ComponentPlacer | null = null;
+
+  public board = new Board();
+
+  render(canvas: HTMLCanvasElement) {
+    const c = canvas.getContext("2d")!;
+
+    c.imageSmoothingEnabled = false;
+    c.fillStyle = "#666";
+    c.fillRect(0, 0, canvas.width, canvas.height);
+
+    const gridSize = this.gridSize;
+    const dotSize = { x: 2, y: 2 };
+
+    c.fillStyle = "#111";
+    for (let y = 0; y < canvas.width / gridSize.x + 1; ++y) {
+      for (let x = 0; x < canvas.height / gridSize.y + 1; ++x) {
+        c.fillRect(
+          (this.offset.x % gridSize.x) + x * gridSize.x - dotSize.x / 2,
+          (this.offset.y % gridSize.y) + y * gridSize.y - dotSize.y / 2,
+          dotSize.x,
+          dotSize.y,
+        );
+      }
+    }
+
+    this.board.render(canvas, c, this.offset, gridSize);
+
+    if (this.selectionRect) {
+      const {
+        pos: { x, y },
+        size: { x: w, y: h },
+      } = this.selectionRect;
+
+      c.fillStyle = `#ff880088`;
+      c.fillRect(x, y, w, h);
+      c.strokeStyle = `#ff8800`;
+      c.lineWidth = 2;
+      c.strokeRect(x, y, w, h);
+    }
+
+    if (this.componentPlacer) {
+      const {
+        pos: { x, y },
+        size: { x: w, y: h },
+      } = this.componentPlacer;
+
+      c.strokeStyle = `#ffffff`;
+      c.lineWidth = 2;
+      c.strokeRect(x - (x % gridSize.x), y - (y % gridSize.y), w, h);
+    }
+  }
+
+  renderIfNeeded(canvas: HTMLCanvasElement) {
+    if (this.renderNeeded) {
+      this.render(canvas);
+      this.renderNeeded = false;
+    }
+  }
+
+  mouseDown(pos: V2) {
+    this.state.onMouseDown?.(pos);
+  }
+  mouseUp(pos: V2) {
+    this.state.onMouseUp?.(pos);
+  }
+  mouseMove(deltaPos: V2, pos: V2) {
+    this.state.onMouseMove?.(deltaPos, pos);
+  }
+  keyDown(key: string) {
+    this.state.onKeyDown?.(key);
+  }
+  keyUp(key: string) {
+    this.state.onKeyUp?.(key);
+  }
+  selectTool(tool: Tool) {
+    // this is very much a hack so that other tools
+    // can be selected from any tool, without me
+    // having to add that in every state.
+    if (!(this.state instanceof Normal)) {
+      this.transitionTo(new Normal(this));
+    }
+    this.state.selectTool?.(tool);
+  }
+  selectedTool(): Tool | null {
+    return this.state.selectedTool?.() ?? null;
+  }
+
+  addUpdateAction(action: () => void): object {
+    this.updateActions.push(action);
+    return action;
+  }
+
+  removeUpdateAction(actionId: object) {
+    this.updateActions = this.updateActions.filter(
+      (action) => action !== actionId,
+    );
+  }
+
+  transitionTo(newState: State) {
+    this.state.leaveState?.();
+    this.state = newState;
+    this.state.enterState?.();
+    this.notifyListeners();
+  }
+
+  notifyListeners() {
+    for (const action of this.updateActions) {
+      action();
+    }
+  }
+
+  moveOffset(deltaPos: V2) {
+    this.offset.x += deltaPos.x;
+    this.offset.y += deltaPos.y;
+    this.renderNeeded = true;
+  }
+
+  addSelectionRect(pos: V2) {
+    this.selectionRect = { pos, size: V2(0, 0) };
+    this.renderNeeded = true;
+  }
+
+  removeSelectionRect() {
+    this.selectionRect = null;
+    this.renderNeeded = true;
+  }
+
+  moveSelectionRect(deltaPos: V2) {
+    if (this.selectionRect) {
+      this.selectionRect.size.x += deltaPos.x;
+      this.selectionRect.size.y += deltaPos.y;
+      this.renderNeeded = true;
+    }
+  }
+
+  addComponentPlacer(pos: V2, size: V2) {
+    this.componentPlacer = { pos, size };
+    this.renderNeeded = true;
+  }
+
+  removeComponentPlacer() {
+    this.componentPlacer = null;
+    this.renderNeeded = true;
+  }
+
+  setComponentPlacerPos(pos: V2) {
+    if (this.componentPlacer) {
+      this.componentPlacer.pos = pos;
+      this.renderNeeded = true;
+    }
+  }
+
+  canvasPosToBoard(pos: V2): V2 {
+    const absX = pos.x - this.offset.x;
+    const absY = pos.y - this.offset.y;
+    return V2(
+      (absX - (absX % this.gridSize.x)) / this.gridSize.x,
+      (absY - (absY % this.gridSize.y)) / this.gridSize.y,
+    );
+  }
+}
+
+export type SelectionRect = {
+  pos: V2;
+  size: V2;
+};
+
+export type ComponentPlacer = {
+  pos: V2;
+  size: V2;
+};
+
+export type Tool = "select" | "pan" | "and";

editor/src/editor/Editor.ts

@@ -0,0 +1,54 @@
+import { Cx, type Tool } from "./Cx";
+import { V2 } from "./V2";
+
+export class Editor {
+  private cx = new Cx();
+
+  render(canvas: HTMLCanvasElement) {
+    this.cx.render(canvas);
+  }
+
+  renderIfNeeded(canvas: HTMLCanvasElement) {
+    this.cx.renderIfNeeded(canvas);
+  }
+
+  mouseDown(pos: V2) {
+    this.cx.mouseDown(pos);
+  }
+
+  mouseUp(pos: V2) {
+    this.cx.mouseUp(pos);
+  }
+
+  mouseMove(deltaPos: V2, pos: V2) {
+    this.cx.mouseMove(deltaPos, pos);
+  }
+
+  keyDown(key: string) {
+    this.cx.keyDown(key);
+  }
+
+  keyUp(key: string) {
+    this.cx.keyUp(key);
+  }
+
+  selectTool(tool: Tool) {
+    this.cx.selectTool(tool);
+  }
+
+  selectedTool(): Tool | null {
+    return this.cx.selectedTool();
+  }
+
+  tools(): Tool[] {
+    return ["select", "pan", "and"];
+  }
+
+  addUpdateAction(action: () => void): object {
+    return this.cx.addUpdateAction(action);
+  }
+
+  removeUpdateAction(actionId: object) {
+    this.cx.removeUpdateAction(actionId);
+  }
+}

editor/src/editor/State.ts

@@ -0,0 +1,14 @@
+import type { Tool } from "./Cx";
+import type { V2 } from "./V2";
+
+export interface State {
+  enterState?(): void;
+  leaveState?(): void;
+  onMouseDown?(pos: V2): void;
+  onMouseUp?(pos: V2): void;
+  onMouseMove?(deltaPos: V2, pos: V2): void;
+  onKeyDown?(key: string): void;
+  onKeyUp?(key: string): void;
+  selectTool?(tool: Tool): void;
+  selectedTool?(): Tool | null;
+}

editor/src/editor/V2.ts

@@ -0,0 +1,11 @@
+export type V2 = { x: number; y: number };
+export const V2 = (x: number, y: number): V2 => ({ x, y });
+
+export function rectsCollide(
+  { x: ax, y: ay }: V2,
+  { x: aw, y: ah }: V2,
+  { x: bx, y: by }: V2,
+  { x: bw, y: bh }: V2,
+): boolean {
+  return ax < bx + bw && ax + aw > bx && ay < by + bh && ay + ah > by;
+}

editor/src/editor/states/Normal.ts

@@ -0,0 +1,36 @@
+import type { Cx, Tool } from "../Cx";
+import type { V2 } from "../V2";
+import type { State } from "../State";
+import { Panning } from "./Panning";
+import { Placing } from "./Placing";
+import { Selecting } from "./Selecting";
+
+export class Normal implements State {
+  constructor(private cx: Cx) {}
+
+  selectTool(tool: Tool): void {
+    switch (tool) {
+      case "pan":
+        this.cx.transitionTo(new Panning(this.cx));
+        break;
+      case "and":
+        this.cx.transitionTo(new Placing(this.cx, "and"));
+    }
+  }
+
+  onMouseDown(pos: V2): void {
+    this.cx.addSelectionRect(pos);
+    this.cx.transitionTo(new Selecting(this.cx));
+  }
+
+  onKeyDown(key: string): void {
+    if (key === "Shift") {
+      this.cx.transitionTo(new Panning(this.cx));
+      return;
+    }
+  }
+
+  selectedTool(): Tool | null {
+    return "select";
+  }
+}

editor/src/editor/states/Panning.ts

@@ -0,0 +1,42 @@
+import type { Cx, Tool } from "../Cx";
+import type { V2 } from "../V2";
+import type { State } from "../State";
+import { Normal } from "./Normal";
+
+export class Panning implements State {
+  private dragging = false;
+
+  constructor(private cx: Cx) {}
+
+  onMouseDown(_pos: V2): void {
+    this.dragging = true;
+  }
+
+  onMouseUp(_pos: V2): void {
+    this.dragging = false;
+  }
+
+  onMouseMove(deltaPos: V2): void {
+    if (this.dragging) {
+      this.cx.moveOffset(deltaPos);
+    }
+  }
+
+  onKeyDown(key: string): void {
+    if (key === "Escape") {
+      this.cx.transitionTo(new Normal(this.cx));
+      return;
+    }
+  }
+
+  onKeyUp(key: string): void {
+    if (key === "Shift") {
+      this.cx.transitionTo(new Normal(this.cx));
+      return;
+    }
+  }
+
+  selectedTool(): Tool | null {
+    return "pan";
+  }
+}

editor/src/editor/states/Placing.ts

@@ -0,0 +1,43 @@
+import { type Cx, type Tool } from "../Cx";
+import { V2 } from "../V2";
+import type { State } from "../State";
+import { Normal } from "./Normal";
+
+export class Placing implements State {
+  constructor(
+    private cx: Cx,
+    private tool: Tool,
+  ) {}
+
+  enterState(): void {
+    this.cx.addComponentPlacer(V2(0, 0), V2(20 * 4, 20 * 2));
+  }
+
+  leaveState(): void {
+    this.cx.removeComponentPlacer();
+  }
+
+  onMouseDown(pos: V2): void {
+    const boardPos = this.cx.canvasPosToBoard(pos);
+    if (this.cx.board.canPlaceComponent(boardPos, V2(4, 2))) {
+      console.log("place");
+      this.cx.board.placeComponent(boardPos, V2(4, 2), "AND");
+      this.cx.transitionTo(new Normal(this.cx));
+    }
+  }
+
+  onMouseMove(_deltaPos: V2, pos: V2): void {
+    this.cx.setComponentPlacerPos(pos);
+  }
+
+  onKeyDown(key: string): void {
+    if (key === "Escape") {
+      this.cx.transitionTo(new Normal(this.cx));
+      return;
+    }
+  }
+
+  selectedTool(): Tool | null {
+    return this.tool;
+  }
+}

editor/src/editor/states/Selecting.ts

@@ -0,0 +1,21 @@
+import type { Cx, Tool } from "../Cx";
+import type { V2 } from "../V2";
+import type { State } from "../State";
+import { Normal } from "./Normal";
+
+export class Selecting implements State {
+  constructor(private cx: Cx) {}
+
+  onMouseUp(_pos: V2): void {
+    this.cx.removeSelectionRect();
+    this.cx.transitionTo(new Normal(this.cx));
+  }
+
+  onMouseMove(deltaPos: V2): void {
+    this.cx.moveSelectionRect(deltaPos);
+  }
+
+  selectedTool(): Tool | null {
+    return "select";
+  }
+}