Circ-renderer

It's a simple tool to render a Logisim Circ file and simulate some of its components

Note: This project is still in development, so it may not work as expected.

Installation

You can use any of your preferred node package manager to install this package.

npm install circ-renderer

Usage

import { CircRenderer } from 'circ-renderer';

// ...

const file = await fetch('./file.circ');
const fileContent = await file.text();

const options = // optional

const canvasElement = new CircRenderer(fileContent, options);

document.body.appendChild(canvasElement);

Options

Name	Required	Default	Description
width	No	800	The width of the canvas
height	No	600	The height of the canvas
scale	No	1	The scale of the canvas
theme	No	-	Color Scheme and skin instructions

Theming and Skins

Theming and skins are still in very early development, the idea is to provide a way to customize the look of the components and the canvas. platform independent, so you can have multple themes and skins for the same circuit.

Theme Object

const theme: CircTheme = {
  colors: // color scheme
  library: // skin instructions
}

Color Scheme

The color scheme is a simple object that contains the colors for the components and the canvas.

// Default color scheme
const colors = {
 primary: "#007bff",
 primary1: "#007bff",
 primary2: "#0056b3",
 backgroundPrimary: "#f8f9fa",
 backgroundPrimaryAlt: "#f8f9fa",
 backgroundSecondary: "#f8f9fa",
 red: "#dc3545",
 orange: "#fd7e14",
 yellow: "#ffc107",
 green: "#28a745",
 cyan: "#17a2b8",
 blue: "#007bff",
 purple: "#6f42c1",
 pink: "#e83e8c", // <- used as base color all default skins
 // These base?? means nothing. possibly will be removed in the future
 base00: "#ffffff",
 base05: "#f8f9fa",
 base10: "#f1f3f5",
 base20: "#e9ecef",
 base25: "#dee2e6",
 base30: "#ced4da",
 base35: "#adb5bd",
 base40: "#868e96",
 base50: "#495057",
 base60: "#343a40",
 base70: "#212529",
 base100: "#000000",
};

Skin Instructions

The skin instructions are simple functions that recives a set of parameters and renders the draw instructions of the component in the canvas.

This is still in development, so the API may change in the future. i'm experimenting with different ways to implement.

Note: The Skin does not render the component ports, this is done by the renderer.

import {
  type NotState, // params from the file.
  type DrawArguments, // arguments used for rendering in canvas, theme information, assets, and component location information.
} from "circ-renderer";

// Example of a skin instruction
const NotSkin = ({
  dimensions,
  ctx,
  theme,
  assets,
}: DrawArguments<NotState>) => {
  const [width, height] = dimensions;

  ctx.drawImage(assets.NOT, 0, -height / 2, width, height * 2);

  ctx.beginPath();
  ctx.font = `${6}px monospace`;

  ctx.fillStyle = theme.colors.base00;
  ctx.strokeStyle = theme.colors.base70;
  ctx.lineWidth = 0.5;
  ctx.textAlign = "center";
  ctx.fill();

  ctx.save();
  ctx.translate(width / 2, height);
  ctx.rotate(-Math.PI / 2);

  ctx.strokeText("NOT", 5, -5);

  ctx.fillText("NOT", 5, -5);
  ctx.restore();
};

Assets

The assets is an experiment to provide a way to render the components with images, this is not the best way to do, but it's a way to do it and I WILL CHANGE IT IN THE NEAR FUTURE.

export const prepareTheme = async (): Promise<CircTheme> => {
  const assets = await loadAsset();

  return {
    colors,
    library: {
      LED: (drawArgs) => LEDSkin({ ...drawArgs, assets }),
      NOT: (drawArgs) => NotSkin({ ...drawArgs, assets }),
      pin: (drawArgs) => PinSkin({ ...drawArgs, assets }),
      wire: (drawArgs) => WireSkin({ ...drawArgs, assets }),
      AND: (drawArgs) => AndSkin({ ...drawArgs, assets }),
      NAND: (drawArgs) => NandSkin({ ...drawArgs, assets }),
      OR: (drawArgs) => OrSkin({ ...drawArgs, assets }),
      XOR: (drawArgs) => XorSkin({ ...drawArgs, assets }),
    },
  };
};

load the assets in the way you like and then overload the skin functions from your theme to use the assets.

my plan is to provide a nice API to render the components with much of hassle and boilerplate. but for now, this is the way to do it.

Example