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Fixed binary user interface

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Signed-off-by: Alexander Lyall <alex@adcm.uk>
This commit is contained in:
Alexander Lyall
2026-02-28 23:35:14 +00:00
parent aa9e071d40
commit af131fc58a
1 changed files with 22 additions and 63 deletions
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77
src/pages/binary.astro
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@@ -5,8 +5,8 @@
* Bit width: 4..64
*
* Requires:
* public/fonts/DSEG7Classic-Regular.woff
* public/fonts/DSEG7Classic-Regular.ttf
* public/fonts/DSEG7Classic-Regular.woff
* public/fonts/DSEG7Classic-Regular.ttf
*/
---
@@ -16,7 +16,7 @@
<meta name="viewport" content="width=device-width,initial-scale=1" />
<title>Binary | Computing:Box</title>
<style>
<style is:global>
:root{
--bg: #1f2027;
--panel: #22242d;
@@ -51,7 +51,7 @@
padding: 32px 20px 60px;
}
/* Layout: readout left, settings panel right (like your screenshot) */
/* Layout: readout/bits on left, settings panel on right */
.layout{
display:grid;
grid-template-columns: 1fr 360px;
@@ -92,7 +92,6 @@
word-break: break-all;
}
/* Buttons under readout (as requested) */
.controls{
margin-top: 16px;
display:flex;
@@ -142,7 +141,7 @@
line-height: 1.35;
}
/* Reusable toggle switch (for MODE and for each BIT) */
/* Reusable toggle switch */
.switch{
position: relative;
width: 56px;
@@ -260,7 +259,7 @@
opacity: .95;
}
/* Bulb (must come back!) */
/* Bulb */
.bulb{
width: 22px;
height: 22px;
@@ -293,7 +292,7 @@
<body>
<main class="wrap">
<section class="layout">
<!-- LEFT: readout + buttons -->
<div>
<div class="readout">
<div class="label">Denary</div>
@@ -310,80 +309,56 @@
</div>
</div>
<!-- Bits grid (built by JS so bit-width 4..64 works) -->
<section id="bitsGrid" class="bits" aria-label="Bit switches"></section>
</div>
<!-- RIGHT: settings panel -->
<aside>
<div class="panel">
<div class="panelTitle">Mode</div>
<div class="panelRow">
<span style="font-weight:800;">Unsigned</span>
<!-- MODE TOGGLE uses SAME switch style -->
<label class="switch" aria-label="Toggle Two's complement mode">
<input id="modeToggle" type="checkbox" />
<span class="slider"></span>
</label>
<span style="font-weight:800;">Two’s complement</span>
<span style="font-weight:800;">Two's complement</span>
</div>
<div class="hint">
Tip: In two’s complement, the left-most bit (MSB) represents a negative value.
Tip: In two's complement, the left-most bit (MSB) represents a negative value.
</div>
</div>
<div class="panel">
<div class="panelTitle">Bit width</div>
<div class="bwControls">
<button class="bwBtn" id="btnBitsDown" type="button" aria-label="Decrease bits">−</button>
<div class="bwInput">
<div class="bwLabel">Bits</div>
<input
id="bitsField"
class="bwField"
type="number"
min="4"
max="64"
step="1"
value="8"
inputmode="numeric"
/>
<input id="bitsField" class="bwField" type="number" min="4" max="64" step="1" value="8" inputmode="numeric" />
</div>
<button class="bwBtn" id="btnBitsUp" type="button" aria-label="Increase bits">+</button>
</div>
<div class="hint">
Minimum 4 bits, maximum 64 bits.
</div>
</div>
</aside>
</section>
</main>
<script type="module">
// ---------- State ----------
let bitsCount = 8; // 4..64
let isTwos = false; // false = unsigned
let bitStates = []; // MSB -> LSB booleans
let bitsCount = 8;
let isTwos = false;
let bitStates = [];
// ---------- Helpers ----------
function clamp(n, min, max){ return Math.min(max, Math.max(min, n)); }
function pow2(n){
// for up to 64 bits, Number is still OK for *visual simulator*.
// if you later want exact 64-bit maths, swap to BigInt end-to-end.
return 2 ** n;
}
function pow2(n){ return 2 ** n; }
function getPlaceValues(){
// MSB -> LSB
// Unsigned: [2^(n-1), ..., 1]
// Two's: [-2^(n-1), 2^(n-2), ..., 1]
const vals = [];
for (let i = 0; i < bitsCount; i++){
const power = bitsCount - 1 - i;
@@ -420,7 +395,6 @@
document.getElementById("binaryNumber").innerText = binaryString();
document.getElementById("denaryNumber").innerText = String(denaryValue());
// bulb on/off updates:
for (let i = 0; i < bitsCount; i++){
const bulb = document.getElementById(`bulb-${i}`);
if (bulb) bulb.classList.toggle("on", !!bitStates[i]);
@@ -430,7 +404,6 @@
// ---------- DOM build for bits grid ----------
function setBitsGridColumns(){
const grid = document.getElementById("bitsGrid");
// make it adapt (up to 16 per row max, then wraps)
const cols = clamp(bitsCount, 4, 16);
grid.style.gridTemplateColumns = `repeat(${cols}, 1fr)`;
}
@@ -456,10 +429,8 @@
const val = document.createElement("div");
val.className = "bitVal num";
// show absolute label for MSB in twos? No — show the actual negative value (clear to students).
val.textContent = String(v);
// IMPORTANT: bit switch must be the SAME style as MODE switch
const label = document.createElement("label");
label.className = "switch";
label.setAttribute("aria-label", `Toggle bit ${v}`);
@@ -483,6 +454,7 @@
bit.appendChild(bulb);
bit.appendChild(val);
bit.appendChild(label);
grid.appendChild(bit);
}
@@ -497,7 +469,6 @@
const padded = clean.slice(-bitsCount).padStart(bitsCount, "0");
bitStates = [...padded].map(ch => ch === "1");
// update toggles without rebuilding
for (let i = 0; i < bitsCount; i++){
const toggle = document.querySelector(`input[type="checkbox"][data-index="${i}"]`);
if (toggle) toggle.checked = bitStates[i];
@@ -513,16 +484,13 @@
const { min, max } = rangeForMode();
if (num < min || num > max) return false;
// convert to bit pattern
let unsignedVal;
if (!isTwos){
unsignedVal = num;
} else {
// two's complement representation
unsignedVal = num < 0 ? (pow2(bitsCount) + num) : num;
}
// build MSB->LSB bits from unsignedVal
const newBits = [];
for (let i = 0; i < bitsCount; i++){
const power = bitsCount - 1 - i;
@@ -541,17 +509,14 @@
// ---------- Shifts ----------
function shiftLeft(){
// logical left shift: drop MSB, add 0 at LSB
bitStates = bitStates.slice(1).concat(false);
buildBitsGrid(); // rebuild keeps labels correct if mode changed (also updates bulbs)
buildBitsGrid();
}
function shiftRight(){
if (!isTwos){
// logical right shift
bitStates = [false].concat(bitStates.slice(0, -1));
} else {
// arithmetic right shift (preserve MSB)
const msb = bitStates[0];
bitStates = [msb].concat(bitStates.slice(0, -1));
}
@@ -563,11 +528,9 @@
const wanted = clamp(Number(next) || 8, 4, 64);
if (wanted === bitsCount) return;
// keep the right-most (LSB) bits when resizing (feels natural)
const old = binaryString();
bitsCount = wanted;
// rebuild state from old binary, keeping LSBs
const padded = old.slice(-bitsCount).padStart(bitsCount, "0");
bitStates = [...padded].map(ch => ch === "1");
@@ -577,10 +540,9 @@
// ---------- Mode toggle ----------
function applyMode(nextIsTwos){
const prevDenary = denaryValue(); // keep the *value* if possible
const prevDenary = denaryValue();
isTwos = !!nextIsTwos;
// Try to keep the denary value, but clamp if it becomes invalid in the new mode
const { min, max } = rangeForMode();
const kept = clamp(prevDenary, min, max);
setFromDenary(kept);
@@ -606,11 +568,9 @@
if (!setFromDenary(val)) alert(`Invalid input. Enter an integer from ${min} to ${max}.`);
});
// Mode toggle
const modeToggle = document.getElementById("modeToggle");
modeToggle.addEventListener("change", () => applyMode(modeToggle.checked));
// Bit width +/- and manual entry
document.getElementById("btnBitsDown").addEventListener("click", () => applyBitsCount(bitsCount - 1));
document.getElementById("btnBitsUp").addEventListener("click", () => applyBitsCount(bitsCount + 1));
@@ -624,7 +584,6 @@
// ---------- Init ----------
function init(){
// default: 8-bit unsigned
bitsCount = 8;
isTwos = false;
bitStates = Array(bitsCount).fill(false);