diff --git a/src/canvas.ts b/src/canvas.ts
new file mode 100644
index 0000000..47c6684
--- /dev/null
+++ b/src/canvas.ts
@@ -0,0 +1,105 @@
+import { EvHandler, EvHandlerRes, Mouse } from "./input.ts";
+import { Renderer } from "./renderer.ts";
+
+export class CanvasRenderer implements Renderer {
+    constructor(
+        private c: HTMLCanvasElement,
+        private g: CanvasRenderingContext2D,
+    ) {}
+
+    get width(): number {
+        return this.c.width;
+    }
+    get height(): number {
+        return this.c.height;
+    }
+
+    clear(color: string): void {
+        const { g } = this;
+        g.fillStyle = color;
+        g.fillRect(0, 0, this.c.width, this.c.height);
+    }
+
+    fillRect(x: number, y: number, w: number, h: number, color: string): void {
+        const { g } = this;
+        g.fillStyle = color;
+        g.fillRect(x, y, w, h);
+    }
+
+    fillCirc(x: number, y: number, radius: number, color: string): void {
+        const { g } = this;
+        g.fillStyle = color;
+        g.beginPath();
+        g.arc(x, y, radius, 0, Math.PI * 2);
+        g.fill();
+    }
+
+    putImageData(data: ImageData, x: number, y: number, _hash = 0n): void {
+        const { g } = this;
+        g.putImageData(data, x, y);
+    }
+}
+
+export class CanvasMouse implements Mouse {
+    public x = 0;
+    public y = 0;
+
+    private pressHandlers: EvHandler[] = [];
+    private releaseHandlers: EvHandler[] = [];
+    private moveHandlers: EvHandler[] = [];
+    private scrollHandlers: ((direction: "up" | "down") => EvHandlerRes)[] = [];
+
+    constructor(c: HTMLCanvasElement) {
+        c.onmousemove = (ev) => {
+            this.x = ev.x;
+            this.y = ev.y;
+        };
+        c.onmousedown = (ev) => {
+            if (ev.button === 0) {
+                this.runHandlers(this.pressHandlers);
+            }
+        };
+        c.onmouseup = (ev) => {
+            if (ev.button === 0) {
+                this.runHandlers(this.releaseHandlers);
+            }
+        };
+        c.onmousemove = (ev) => {
+            this.x = ev.x;
+            this.y = ev.y;
+            this.runHandlers(this.moveHandlers);
+        };
+        c.onwheel = (ev) => {
+            if (ev.deltaY !== 0) {
+                this.runHandlers(
+                    this.scrollHandlers,
+                    ev.deltaY < 0 ? "up" : "down",
+                );
+            }
+        };
+    }
+
+    private runHandlers<Args extends unknown[] = []>(
+        handlers: EvHandler<Args>[],
+        ...args: Args
+    ) {
+        for (const handler of handlers.toReversed()) {
+            if (handler(...args) === "stop") {
+                break;
+            }
+        }
+    }
+
+    addOnPress(handler: EvHandler) {
+        this.pressHandlers.push(handler);
+    }
+    addOnRelease(handler: EvHandler) {
+        this.releaseHandlers.push(handler);
+    }
+    addOnMove(handler: EvHandler) {
+        this.moveHandlers.push(handler);
+    }
+    addOnScroll(handler: EvHandler<["up" | "down"]>) {
+        this.scrollHandlers.push(handler);
+    }
+}
diff --git a/src/grid.ts b/src/grid.ts
new file mode 100644
index 0000000..a9a2852
--- /dev/null
+++ b/src/grid.ts
@@ -0,0 +1,219 @@
+import { Mouse } from "./input.ts";
+import { Renderer } from "./renderer.ts";
+
+export class Grid {
+    private t: Transformation = { s: 2, ox: 0, oy: 0 };
+    private transformer = new Transformer(this.t);
+    private tr = new TransformingRenderer(this.t);
+
+    constructor(
+        private mouse: Mouse,
+    ) {
+        this.mouse.addOnPress(() => {
+            this.transformer.startPan();
+            return "stop";
+        });
+        this.mouse.addOnRelease(() => {
+            this.transformer.endPan();
+            return "stop";
+        });
+        this.mouse.addOnMove(() => {
+            const { x, y } = this.mouse;
+            this.transformer.move(x, y);
+            return "stop";
+        });
+        this.mouse.addOnScroll((direction) => {
+            if (direction === "up") {
+                this.transformer.zoomIn();
+            } else {
+                this.transformer.zoomOut();
+            }
+            this.tr.clearCache();
+            return "stop";
+        });
+    }
+
+    render(r: Renderer, renderTransformed: (r: Renderer) => void) {
+        this.transformer.updateCanvas(r.width, r.height);
+        this.drawGrid(r);
+        this.tr.render(r, (tr) => {
+            renderTransformed(tr);
+        });
+    }
+
+    private drawGrid(r: Renderer) {
+        const { t: { s, ox, oy } } = this;
+        r.clear("#ddd");
+
+        const dotSpace = 32 * s;
+
+        const dotOffsetX = ox % dotSpace - dotSpace;
+        const dotOffsetY = oy % dotSpace - dotSpace;
+
+        const dotWidth = r.width / dotSpace + 1;
+        const dotHeight = r.height / dotSpace + 1;
+
+        if (s < 0.2) {
+            return;
+        }
+        for (let y = 0; y < Math.min(dotHeight, 200); ++y) {
+            for (let x = 0; x < Math.min(dotWidth, 200); ++x) {
+                r.fillCirc(
+                    x * dotSpace + dotOffsetX + 16 * s,
+                    y * dotSpace + dotOffsetY + 16 * s,
+                    2 * s,
+                    "#bbb",
+                );
+            }
+        }
+    }
+}
+
+// offset is screen offset
+type Transformation = {
+    s: number;
+    ox: number;
+    oy: number;
+};
+
+class Transformer {
+    private isPanning = false;
+
+    private lastMouseX = 0;
+    private lastMouseY = 0;
+    private lastCanvasWidth = 0;
+    private lastCanvasHeight = 0;
+
+    constructor(
+        private t: Transformation,
+    ) {}
+
+    updateCanvas(width: number, height: number) {
+        this.lastCanvasWidth = width;
+        this.lastCanvasHeight = height;
+    }
+
+    startPan() {
+        this.isPanning = true;
+    }
+
+    endPan() {
+        this.isPanning = false;
+    }
+
+    move(x: number, y: number) {
+        const deltaX = x - this.lastMouseX;
+        const deltaY = y - this.lastMouseY;
+        this.lastMouseX = x;
+        this.lastMouseY = y;
+        if (this.isPanning) {
+            this.t.ox += deltaX;
+            this.t.oy += deltaY;
+        }
+    }
+
+    zoomIn() {
+        this.zoom(1 - 1 / 1.1);
+    }
+    zoomOut() {
+        this.zoom(1 - 1.1);
+    }
+
+    private zoom(factor: number) {
+        this.t.s *= 1 + factor;
+
+        const mouseRatioX = (this.lastMouseX - this.t.ox) /
+            this.lastCanvasWidth;
+        const mouseRatioY = (this.lastMouseY - this.t.oy) /
+            this.lastCanvasHeight;
+
+        const deltaOffsetX = this.lastCanvasWidth * factor *
+            mouseRatioX * -1;
+        const deltaOffsetY = this.lastCanvasHeight * factor *
+            mouseRatioY * -1;
+
+        this.t.ox += deltaOffsetX;
+        this.t.oy += deltaOffsetY;
+    }
+}
+
+class TransformingRenderer implements Renderer {
+    private imageDataCache = new Map<bigint, ImageData>();
+    private r!: Renderer;
+
+    constructor(
+        private t: Transformation,
+    ) {}
+
+    render(r: Renderer, renderTransformed: (r: Renderer) => void): void {
+        this.r = r;
+        renderTransformed(this);
+    }
+
+    clearCache() {
+        this.imageDataCache.clear();
+    }
+
+    get width(): number {
+        return this.r.width / this.t.s;
+    }
+    get height(): number {
+        return this.r.height / this.t.s;
+    }
+    clear(color: string): void {
+        this.r.clear(color);
+    }
+    fillRect(x: number, y: number, w: number, h: number, color: string): void {
+        const { r, t: { s, ox, oy } } = this;
+        r.fillRect(x * s + ox, y * s + oy, w * s, h * s, color);
+    }
+    fillCirc(x: number, y: number, radius: number, color: string): void {
+        const { r, t: { s, ox, oy } } = this;
+        r.fillCirc(x * s + ox, y * s + oy, radius * s, color);
+    }
+    putImageData(data: ImageData, x: number, y: number, hash = 0n): void {
+        const { r, t: { s, ox, oy } } = this;
+
+        if (hash === 0n || !this.imageDataCache.has(hash)) {
+            const scaledWidth = data.width * s;
+            const scaledHeight = data.height * s;
+
+            const canvas = new OffscreenCanvas(
+                Math.max(data.width, scaledWidth),
+                Math.max(data.height, scaledHeight),
+            );
+            const ctx = canvas.getContext("2d")!;
+            ctx.putImageData(data, 0, 0);
+            ctx.scale(s, s);
+
+            const scaledData = ctx.getImageData(
+                0,
+                0,
+                scaledWidth,
+                scaledHeight,
+            );
+
+            if (hash === 0n) {
+                r.putImageData(
+                    scaledData,
+                    x * s + ox,
+                    y * s + oy,
+                );
+                return;
+            }
+            if (this.imageDataCache.size > 128) {
+                this.imageDataCache.delete(
+                    this.imageDataCache.keys().take(1).toArray()[0],
+                );
+            }
+            this.imageDataCache.set(hash, scaledData);
+            console.log(this.imageDataCache);
+        }
+
+        r.putImageData(
+            this.imageDataCache.get(hash)!,
+            x * s + ox,
+            y * s + oy,
+        );
+    }
+}
diff --git a/src/input.ts b/src/input.ts
new file mode 100644
index 0000000..d539774
--- /dev/null
+++ b/src/input.ts
@@ -0,0 +1,14 @@
+export type EvHandlerRes = "bubble" | "stop";
+export type EvHandler<Args extends unknown[] = []> = (
+    ...args: Args
+) => EvHandlerRes;
+
+export interface Mouse {
+    get x(): number;
+    get y(): number;
+
+    addOnPress(handler: EvHandler): void;
+    addOnRelease(handler: EvHandler): void;
+    addOnMove(handler: EvHandler): void;
+    addOnScroll(handler: EvHandler<["up" | "down"]>): void;
+}
diff --git a/src/main.ts b/src/main.ts
index afb0a6d..375806a 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,9 +1,23 @@
+import { CanvasMouse, CanvasRenderer } from "./canvas.ts";
+import { Simulator } from "./simulator.ts";
+
 const c = document.querySelector<HTMLCanvasElement>("canvas#editor")!;
-const g = c.getContext("2d")!;
+const g = c.getContext("2d", { alpha: false })!;
 
 c.width = document.body.clientWidth;
 c.height = document.body.clientHeight;
 c.style.position = "absolute";
 
-g.fillStyle = "#aa2233";
-g.fillRect(0, 0, c.width, c.height);
+const r = new CanvasRenderer(c, g);
+const mouse = new CanvasMouse(c);
+
+const simulator = new Simulator(mouse);
+
+function render() {
+    simulator.render(r);
+
+    requestAnimationFrame(() => {
+        render();
+    });
+}
+render();
diff --git a/src/painter.ts b/src/painter.ts
new file mode 100644
index 0000000..d58ee11
--- /dev/null
+++ b/src/painter.ts
@@ -0,0 +1,52 @@
+import { CanvasRenderer } from "./canvas.ts";
+import { Renderer } from "./renderer.ts";
+
+export class Painter implements Renderer {
+    private c: OffscreenCanvas;
+    private g: OffscreenCanvasRenderingContext2D;
+    private r: Renderer;
+
+    private hash: bigint = 0n;
+
+    constructor(width: number, height: number) {
+        this.c = new OffscreenCanvas(width, height);
+        this.g = this.c.getContext("2d", { alpha: false })!;
+        this.r = new CanvasRenderer(
+            this.c as unknown as HTMLCanvasElement,
+            this.g as unknown as CanvasRenderingContext2D,
+        );
+        this.rehash();
+    }
+
+    private rehash() {
+        this.hash = BigInt(Math.floor(Math.random() * Number.MAX_SAFE_INTEGER));
+    }
+
+    render(r: Renderer, x: number, y: number) {
+        const data = this.g.getImageData(0, 0, this.c.width, this.c.height);
+        r.putImageData(data, x, y, this.hash);
+    }
+
+    get width(): number {
+        return this.r.width;
+    }
+    get height(): number {
+        return this.r.height;
+    }
+    clear(color: string): void {
+        this.rehash();
+        this.r.clear(color);
+    }
+    fillRect(x: number, y: number, w: number, h: number, color: string): void {
+        this.rehash();
+        this.r.fillRect(x, y, w, h, color);
+    }
+    fillCirc(x: number, y: number, radius: number, color: string): void {
+        this.rehash();
+        this.r.fillCirc(x, y, radius, color);
+    }
+    putImageData(data: ImageData, x: number, y: number, hash?: bigint): void {
+        this.rehash();
+        this.r.putImageData(data, x, y, hash);
+    }
+}
diff --git a/src/renderer.ts b/src/renderer.ts
new file mode 100644
index 0000000..97276c9
--- /dev/null
+++ b/src/renderer.ts
@@ -0,0 +1,10 @@
+type N = number;
+
+export interface Renderer {
+    get width(): N;
+    get height(): N;
+    clear(color: string): void;
+    fillRect(x: N, y: N, w: N, h: N, color: string): void;
+    fillCirc(x: N, y: N, radius: N, color: string): void;
+    putImageData(data: ImageData, x: N, y: N, hash?: bigint): void;
+}
diff --git a/src/simulator.ts b/src/simulator.ts
new file mode 100644
index 0000000..4b870c2
--- /dev/null
+++ b/src/simulator.ts
@@ -0,0 +1,39 @@
+import { Grid } from "./grid.ts";
+import { Mouse } from "./input.ts";
+import { Painter } from "./painter.ts";
+import { Renderer } from "./renderer.ts";
+
+export class Simulator {
+    private grid: Grid;
+
+    private myComponent = new Component();
+
+    constructor(
+        private mouse: Mouse,
+    ) {
+        this.grid = new Grid(this.mouse);
+    }
+
+    render(r: Renderer) {
+        r.clear("black");
+        this.grid.render(r, (r) => {
+            this.myComponent.render(r);
+        });
+    }
+}
+
+class Circuit {
+    private components: Component[] = [];
+}
+
+class Component {
+    private p = new Painter(64, 64);
+
+    constructor() {
+        this.p.clear("black");
+    }
+
+    render(r: Renderer) {
+        this.p.render(r, 0, 0);
+    }
+}
diff --git a/static/index.html b/static/index.html
index d51da97..b54b9bc 100644
--- a/static/index.html
+++ b/static/index.html
@@ -4,7 +4,7 @@
         <meta charset="UTF-8">
         <meta name="viewport" content="width=device-width, initial-scale=1">
         <link rel="stylesheet" href="style.css">
-        <script src="bundle.js" defer></script>
+        <script src="bundle.js" type="module" defer></script>
         <title>LogiCirc</title>
     </head>
     <body>