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feat(binary): add full binary simulator with unsigned and two’s complement modes
- Introduce new Binary Simulator page with adjustable bit width (4–16 bits) - Support unsigned and two’s complement representations with live conversion - Add left/right shift operations and custom binary/denary input - Implement accessible bulb-and-switch UI with MD3-inspired styling - Add seven-segment display font assets for realistic number output - Establish shared base layout, styles, and tooling for future simulators Signed-off-by: Alexander Lyall <alex@adcm.uk>
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381
src/components/tools/BinarySimulator.astro
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381
src/components/tools/BinarySimulator.astro
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---
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const { mode = "unsigned", defaultBits = 8 } = Astro.props;
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// For unsigned: min 1 bit, max 16 bits (tweak if you want)
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const minBits = 4;
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const maxBits = 16;
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const initialBits = Math.min(Math.max(defaultBits, minBits), maxBits);
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---
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<section class="binary-sim" data-mode={mode} data-bits={initialBits}>
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<div class="top">
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<div class="left-brand">
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<!-- Replace with your logo/img -->
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<div class="brand-box" aria-hidden="true">Computing:Box</div>
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</div>
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<div class="display" aria-live="polite">
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<div class="label">DENARY</div>
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<div id="denaryNumber" class="value">0</div>
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<div class="label">BINARY</div>
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<div id="binaryNumber" class="value mono">00000000</div>
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</div>
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<div class="actions">
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<button class="btn" type="button" data-action="custom-binary">Custom Binary</button>
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<button class="btn" type="button" data-action="custom-denary">Custom Denary</button>
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<button class="btn" type="button" data-action="shift-left">Left Shift</button>
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<button class="btn" type="button" data-action="shift-right">Right Shift</button>
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<div class="bits-control">
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<div class="bits-title">Bits</div>
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<div class="bits-buttons">
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<button class="btn small" type="button" data-action="bits-minus" aria-label="Decrease bits">−</button>
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<span id="bitsCount" class="bits-count">{initialBits}</span>
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<button class="btn small" type="button" data-action="bits-plus" aria-label="Increase bits">+</button>
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</div>
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</div>
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</div>
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</div>
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<div id="bitsRow" class="bits-row" aria-label="Binary bit switches"></div>
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</section>
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<script is:inline>
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(() => {
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const root = document.currentScript.closest(".binary-sim");
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const bitsRow = root.querySelector("#bitsRow");
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const binaryEl = root.querySelector("#binaryNumber");
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const denaryEl = root.querySelector("#denaryNumber");
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const bitsCountEl = root.querySelector("#bitsCount");
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let bitCount = parseInt(root.dataset.bits || "8", 10);
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const minBits = 4;
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const maxBits = 16;
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// state: array of 0/1, MSB at index 0
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let bits = new Array(bitCount).fill(0);
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function placeValues(n) {
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// unsigned place values: [2^(n-1), ..., 2^0]
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return Array.from({ length: n }, (_, i) => 2 ** (n - 1 - i));
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}
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function bitsToDenary(bitsArr) {
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const pv = placeValues(bitsArr.length);
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return bitsArr.reduce((acc, b, i) => acc + (b ? pv[i] : 0), 0);
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}
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function render() {
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const binaryStr = bits.join("");
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binaryEl.textContent = binaryStr;
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denaryEl.textContent = String(bitsToDenary(bits));
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bitsCountEl.textContent = String(bitCount);
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const pv = placeValues(bitCount);
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bitsRow.innerHTML = pv.map((value, i) => {
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const id = `bit_${bitCount}_${i}`;
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const checked = bits[i] === 1 ? "checked" : "";
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return `
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<div class="bit-col">
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<div class="bulb ${bits[i] ? "on" : "off"}" aria-hidden="true"></div>
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<div class="place">${value}</div>
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<label class="switch" for="${id}">
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<input id="${id}" type="checkbox" ${checked} data-index="${i}">
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<span class="slider" aria-hidden="true"></span>
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<span class="sr-only">Toggle bit value ${value}</span>
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</label>
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</div>
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`;
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}).join("");
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}
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function setBitsFromBinaryString(str) {
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// allow shorter input; pad left
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const clean = (str || "").trim();
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if (!/^[01]+$/.test(clean) || clean.length > bitCount) return false;
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const padded = clean.padStart(bitCount, "0");
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bits = padded.split("").map(c => c === "1" ? 1 : 0);
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return true;
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}
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function setBitsFromDenary(num) {
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if (!Number.isInteger(num)) return false;
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const max = (2 ** bitCount) - 1;
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if (num < 0 || num > max) return false;
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const bin = num.toString(2).padStart(bitCount, "0");
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bits = bin.split("").map(c => c === "1" ? 1 : 0);
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return true;
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}
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function shiftLeft() {
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bits = bits.slice(1).concat(0);
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}
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function shiftRight() {
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bits = [0].concat(bits.slice(0, -1));
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}
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function resizeBits(newCount) {
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const clamped = Math.max(minBits, Math.min(maxBits, newCount));
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if (clamped === bitCount) return;
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// keep value as best as possible: preserve LSBs when resizing
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const currentBinary = bits.join("");
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bitCount = clamped;
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bits = new Array(bitCount).fill(0);
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const take = currentBinary.slice(-bitCount);
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setBitsFromBinaryString(take);
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}
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// Switch input handler
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bitsRow.addEventListener("change", (e) => {
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const input = e.target;
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if (!(input instanceof HTMLInputElement)) return;
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const idx = parseInt(input.dataset.index || "-1", 10);
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if (idx < 0) return;
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bits[idx] = input.checked ? 1 : 0;
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render();
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});
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// Button actions
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root.querySelector(".actions").addEventListener("click", (e) => {
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const btn = e.target.closest("button[data-action]");
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if (!btn) return;
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const action = btn.dataset.action;
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if (action === "custom-binary") {
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const entered = prompt(`Enter a ${bitCount}-bit binary value (0s and 1s):`, bits.join(""));
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if (entered === null) return;
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if (!setBitsFromBinaryString(entered)) {
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alert(`Invalid binary. Use only 0 and 1, up to ${bitCount} digits.`);
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return;
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}
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render();
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}
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if (action === "custom-denary") {
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const max = (2 ** bitCount) - 1;
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const entered = prompt(`Enter a denary value (0 to ${max}):`, String(bitsToDenary(bits)));
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if (entered === null) return;
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const num = Number.parseInt(entered, 10);
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if (!setBitsFromDenary(num)) {
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alert(`Invalid denary. Enter a whole number from 0 to ${max}.`);
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return;
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}
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render();
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}
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if (action === "shift-left") { shiftLeft(); render(); }
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if (action === "shift-right") { shiftRight(); render(); }
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if (action === "bits-minus") { resizeBits(bitCount - 1); render(); }
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if (action === "bits-plus") { resizeBits(bitCount + 1); render(); }
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});
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// initial
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render();
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})();
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</script>
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<style>
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/* Layout */
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.binary-sim {
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padding: 2rem 1rem 3rem;
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}
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.top {
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display: grid;
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grid-template-columns: 260px 1fr 220px;
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gap: 1.5rem;
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align-items: start;
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}
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@media (max-width: 980px) {
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.top {
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grid-template-columns: 1fr;
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}
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.actions {
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display: grid;
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grid-template-columns: 1fr 1fr;
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}
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}
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/* Brand placeholder */
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.brand-box {
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width: 180px;
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height: 180px;
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border-radius: 12px;
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display: grid;
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place-items: center;
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font-weight: 700;
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opacity: 0.9;
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border: 1px solid rgba(255,255,255,0.08);
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background: rgba(255,255,255,0.04);
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}
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/* Display */
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.display {
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text-align: center;
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padding: 1rem;
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}
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.label {
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letter-spacing: 0.12em;
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opacity: 0.85;
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margin-top: 0.5rem;
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}
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.value {
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font-size: 3rem;
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line-height: 1.1;
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margin: 0.25rem 0 0.75rem;
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font-weight: 700;
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}
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.mono {
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font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
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}
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/* Buttons */
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.actions {
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display: flex;
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flex-direction: column;
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gap: 0.75rem;
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}
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.btn {
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border: 0;
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border-radius: 10px;
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padding: 0.75rem 1rem;
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font-weight: 600;
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cursor: pointer;
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background: rgba(255,255,255,0.08);
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color: inherit;
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}
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.btn:hover { background: rgba(255,255,255,0.12); }
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.btn.small {
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padding: 0.45rem 0.75rem;
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border-radius: 10px;
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}
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.bits-control {
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margin-top: 0.25rem;
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padding-top: 0.5rem;
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border-top: 1px solid rgba(255,255,255,0.08);
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}
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.bits-title { opacity: 0.8; margin-bottom: 0.35rem; }
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.bits-buttons {
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display: flex;
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align-items: center;
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gap: 0.5rem;
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}
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.bits-count {
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min-width: 2ch;
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text-align: center;
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font-weight: 700;
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}
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/* Bits row */
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.bits-row {
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margin-top: 2rem;
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display: grid;
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grid-template-columns: repeat(auto-fit, minmax(88px, 1fr));
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gap: 1.25rem;
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align-items: end;
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}
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.bit-col {
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text-align: center;
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padding: 0.5rem 0.25rem;
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}
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.place {
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margin: 0.5rem 0 0.5rem;
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font-size: 2rem;
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font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
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}
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/* Bulb */
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.bulb {
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width: 26px;
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height: 26px;
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margin: 0 auto 0.25rem;
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border-radius: 50%;
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border: 1px solid rgba(255,255,255,0.15);
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}
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.bulb.off { opacity: 0.15; }
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.bulb.on { opacity: 1; }
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/* Light switch (accessible checkbox) */
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.switch {
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display: inline-flex;
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align-items: center;
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justify-content: center;
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width: 64px;
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height: 36px;
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position: relative;
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}
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.switch input {
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position: absolute;
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opacity: 0;
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width: 1px;
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height: 1px;
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}
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.slider {
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width: 64px;
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height: 36px;
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border-radius: 999px;
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background: rgba(255,255,255,0.10);
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border: 1px solid rgba(255,255,255,0.14);
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position: relative;
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transition: transform 120ms ease, background 120ms ease;
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}
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.slider::after {
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content: "";
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position: absolute;
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top: 4px;
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left: 4px;
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width: 28px;
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height: 28px;
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border-radius: 999px;
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background: rgba(255,255,255,0.85);
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transition: transform 120ms ease;
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}
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.switch input:checked + .slider {
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background: rgba(255,255,255,0.18);
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}
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.switch input:checked + .slider::after {
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transform: translateX(28px);
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}
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/* focus */
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.switch input:focus-visible + .slider {
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outline: 3px solid rgba(255,255,255,0.35);
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outline-offset: 2px;
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}
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.sr-only {
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position: absolute;
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width: 1px; height: 1px;
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padding: 0; margin: -1px;
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overflow: hidden; clip: rect(0,0,0,0);
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white-space: nowrap; border: 0;
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}
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</style>
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