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Copy pathcircuit diagram secjc v2.html
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1909 lines (1742 loc) · 73.7 KB
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Circuit Diagram Generator</title>
<style>
:root {
--panel: #f3f4f6;
--line: #111827;
--muted: #6b7280;
--border: #d1d5db;
--accent: #2563eb;
--danger: #dc2626;
--bg: #ffffff;
--grid: #e5e7eb;
--sel: #3b82f6;
}
* { box-sizing: border-box; }
body {
margin: 0;
font-family: Arial, Helvetica, sans-serif;
background: #fafafa;
color: #111827;
height: 100vh;
display: grid;
grid-template-columns: 210px 1fr 210px;
}
.sidebar {
background: var(--panel);
padding: 7px;
overflow: auto;
}
.sidebar-left {
border-right: 1px solid var(--border);
}
.sidebar-right {
border-left: 1px solid var(--border);
}
.sidebar h1 {
margin: 0 0 8px;
font-size: 15px;
}
.sidebar h2 {
margin: 8px 0 4px;
font-size: 12px;
text-transform: uppercase;
letter-spacing: .04em;
color: var(--muted);
}
.tool-subgroup-label {
margin: 10px 0 6px;
font-size: 11px;
font-weight: 700;
color: #4b5563;
text-transform: uppercase;
letter-spacing: 0.04em;
}
.tool-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 3px;
}
.tool-section {
margin-bottom: 7px;
padding: 5px;
background: rgba(255,255,255,0.7);
border: 1px solid var(--border);
border-radius: 12px;
}
.tool-section h3 {
margin: 0 0 5px;
font-size: 11px;
color: var(--muted);
text-transform: uppercase;
letter-spacing: .04em;
}
.tool-section p {
margin: 0 0 6px;
font-size: 11px;
color: #4b5563;
line-height: 1.35;
}
button, input, select {
font: inherit;
}
.tool-btn, .action-btn {
border: 1px solid var(--border);
background: white;
padding: 4px 4px;
border-radius: 8px;
cursor: pointer;
min-height: 26px;
}
.tool-btn, .action-btn {
font-size: 11px;
line-height: 1.15;
}
.tool-btn.active, .action-btn.active {
outline: 2px solid var(--accent);
border-color: var(--accent);
background: #eff6ff;
}
.action-row {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 5px;
margin-bottom: 5px;
}
.action-row.single {
grid-template-columns: 1fr;
}
.field {
margin: 6px 0;
}
.field label {
display: block;
font-size: 11px;
color: var(--muted);
margin-bottom: 4px;
}
.field input[type="number"],
.field input[type="text"],
.field select {
width: 100%;
padding: 5px 7px;
border-radius: 8px;
border: 1px solid var(--border);
background: white;
font-size: 11px;
}
.status {
margin-top: 8px;
padding: 8px;
border-radius: 10px;
background: white;
border: 1px solid var(--border);
font-size: 12px;
line-height: 1.35;
color: #374151;
}
.workspace {
position: relative;
overflow: hidden;
background: #fff;
}
#app {
width: 100%;
height: 100%;
display: block;
background: #fff;
cursor: crosshair;
user-select: none;
-webkit-user-select: none;
}
.topbar {
position: absolute;
top: 10px;
right: 10px;
display: flex;
gap: 8px;
z-index: 5;
}
.topbar button {
border: 1px solid var(--border);
background: white;
padding: 9px 12px;
border-radius: 10px;
cursor: pointer;
box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}
.kbd {
display: inline-block;
min-width: 1.4em;
padding: 1px 5px;
border-radius: 6px;
background: #e5e7eb;
font-size: 11px;
}
/* Overlay Text Editor Styling */
.text-editor {
position: absolute;
z-index: 20;
display: none;
border: 2px dashed var(--accent);
border-radius: 4px;
padding: 8px;
margin: 0;
text-align: center;
resize: none;
outline: none;
background: rgba(255,255,255,0.95);
color: #111827;
font-family: Arial, Helvetica, sans-serif;
line-height: 1.25;
box-shadow: 0 4px 12px rgba(0,0,0,0.1);
overflow: hidden;
white-space: pre-wrap;
}
/* Navigator / Minimap Styles */
.navigator-panel {
position: absolute;
bottom: 16px;
right: 16px;
width: 200px;
height: 133px; /* Aspect ratio of 2400x1600 */
background: #fafafa;
border: 1px solid var(--border);
border-radius: 6px;
box-shadow: 0 4px 12px rgba(0,0,0,0.1);
z-index: 10;
overflow: hidden;
cursor: crosshair;
}
#minimap {
width: 100%;
height: 100%;
display: block;
}
#minimap-viewport {
position: absolute;
border: 2px solid var(--accent);
background: rgba(59, 130, 246, 0.15);
pointer-events: none; /* Let clicks pass through */
box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.05);
}
</style>
</head>
<body>
<aside class="sidebar sidebar-left">
<h1>Circuit Diagram Generator</h1>
<h2>Tools</h2>
<div class="tool-section">
<h3>Modes</h3>
<p>Choose how you want to interact with the canvas first.</p>
<div class="tool-grid">
<button class="tool-btn active" data-tool="select">Select / Move</button>
<button class="tool-btn" data-tool="delete">Delete</button>
<button class="tool-btn" data-tool="wire">Wire</button>
<button class="tool-btn" data-tool="arrow">Arrow</button>
<button class="tool-btn" data-tool="label-line">Label Line</button>
<button class="tool-btn" data-tool="divider-arrow">Grid Arrow</button>
<button class="tool-btn" data-tool="textbox">Textbox</button>
</div>
</div>
<h2>Placement</h2>
<div class="action-row">
<button class="action-btn" id="rotateBtn">Rotate 90°</button>
<button class="action-btn" id="rotate180Btn">Rotate 180°</button>
</div>
<div class="action-row single">
<button class="action-btn" id="toggleGridBtn">Hide Grid</button>
</div>
<div class="action-row single">
<button class="action-btn" id="flipPolarityBtn">Flip Power Supply</button>
</div>
<h2>Edit</h2>
<div class="action-row">
<button class="action-btn" id="undoBtn">Undo</button>
<button class="action-btn" id="redoBtn">Redo</button>
</div>
<div class="action-row single">
<button class="action-btn" id="clearBtn">Clear All</button>
</div>
<h2>Export</h2>
<div class="action-row single">
<button class="action-btn" id="exportBtn">Export PNG</button>
</div>
<h2>Properties</h2>
<div class="tool-section">
<div class="field">
<label for="batteryCells">Battery cells in series</label>
<input id="batteryCells" type="number" min="1" max="8" value="2" />
</div>
<hr style="border: 0; border-top: 1px solid var(--border); margin: 8px 0;" />
<div class="field">
<label for="magnetBlocks">Solenoid length (Even grids)</label>
<input id="magnetBlocks" type="number" min="2" max="16" step="2" value="4" />
</div>
<div class="field">
<label for="magnetCoils">Solenoid coils</label>
<input id="magnetCoils" type="number" min="1" max="25" value="5" />
</div>
<hr style="border: 0; border-top: 1px solid var(--border); margin: 8px 0;" />
<div class="field">
<label for="resistorFill">Resistor Pattern</label>
<select id="resistorFill">
<option value="white">White (Default)</option>
<option value="black">Black</option>
<option value="grey">Grey</option>
<option value="dotted">Dotted</option>
<option value="hatched">Hatched (///)</option>
<option value="hatched-rev">Hatched (\\)</option>
<option value="checkered">Checkered</option>
</select>
</div>
<div class="action-row single">
<button class="action-btn" id="updateResistorBtn">Update Resistor</button>
</div>
<hr style="border: 0; border-top: 1px solid var(--border); margin: 8px 0;" />
<div class="field">
<label for="textValue">Textbox content</label>
<input id="textValue" type="text" value="Type here" />
</div>
<div class="field">
<label for="fontSize">Textbox font size</label>
<input id="fontSize" type="number" min="8" max="48" value="12" />
</div>
<div class="action-row single">
<button class="action-btn" id="updateTextBtn">Update Text</button>
</div>
</div>
<div class="status" id="statusBox">
Use <strong>Select / Move</strong> to drag components. Use <strong>Wire</strong> to draw straight snapped segments between grid points.<br><br><strong>Text Tool:</strong> Click canvas to place text. Double-click any text component to edit it directly. Press <strong>Enter</strong> to save, or <strong>Shift+Enter</strong> for a new line.<br><br>Crossings count as connections. Copy and paste commands work only on arrows.<br>Vibe coded by <a href="mailto:tan_jing_yan@schools.gov.sg">Tan Jing Yan (Julienne)</a> with contributions by Tan Seng Kwang
</div>
</aside>
<main class="workspace">
<div class="topbar">
<button id="zoomOutBtn" title="Zoom out">−</button>
<button id="zoomResetBtn" title="Reset zoom">100%</button>
<button id="zoomInBtn" title="Zoom in">+</button>
<button id="fitBtn">Centre View</button>
</div>
<svg id="app" xmlns="http://www.w3.org/2000/svg"></svg>
<textarea id="inlineEditor" class="text-editor" placeholder="Type here..."></textarea>
<div id="navigator" class="navigator-panel">
<svg id="minimap" xmlns="http://www.w3.org/2000/svg"></svg>
<div id="minimap-viewport"></div>
</div>
</main>
<aside class="sidebar sidebar-right">
<h1>Components</h1>
<div class="tool-section">
<h3>Sources and components</h3>
<div class="tool-subgroup-label">Sources</div>
<div class="tool-grid">
<button class="tool-btn" data-tool="battery">Battery</button>
<button class="tool-btn" data-tool="dc-supply">DC Supply</button>
<button class="tool-btn" data-tool="power-supply">Power Supply</button>
<button class="tool-btn" data-tool="ac-supply">AC Supply</button>
</div>
<div class="tool-subgroup-label">Control and switching</div>
<div class="tool-grid">
<button class="tool-btn" data-tool="switch-open">Switch Open</button>
<button class="tool-btn" data-tool="switch-closed">Switch Closed</button>
<button class="tool-btn" data-tool="junction">Junction</button>
<button class="tool-btn" data-tool="ground">Ground</button>
</div>
<div class="tool-subgroup-label">Passive components</div>
<div class="tool-grid">
<button class="tool-btn" data-tool="resistor">Resistor</button>
<button class="tool-btn" data-tool="potentiometer">Potentiometer</button>
<button class="tool-btn" data-tool="thermistor">Thermistor</button>
<button class="tool-btn" data-tool="ldr">LDR</button>
<button class="tool-btn" data-tool="capacitor">Capacitor</button>
<button class="tool-btn" data-tool="diode">Diode</button>
<button class="tool-btn" data-tool="transistor">Transistor</button>
<button class="tool-btn" data-tool="fuse">Fuse</button>
</div>
<div class="tool-subgroup-label">Output and other components</div>
<div class="tool-grid">
<button class="tool-btn" data-tool="bulb">Bulb</button>
<button class="tool-btn" data-tool="bell">Bell</button>
<button class="tool-btn" data-tool="heater">Heater</button>
<button class="tool-btn" data-tool="magnetising-coil">Mag Coil</button>
<button class="tool-btn" data-tool="transformer">Transformer</button>
<button class="tool-btn" data-tool="solenoid">Solenoid</button>
</div>
</div>
<div class="tool-section">
<h3>Meters and machines</h3>
<div class="tool-grid">
<button class="tool-btn" data-tool="ammeter">Ammeter</button>
<button class="tool-btn" data-tool="voltmeter">Voltmeter</button>
<button class="tool-btn" data-tool="galvanometer">Galvanometer</button>
<button class="tool-btn" data-tool="motor">Motor</button>
</div>
</div>
</aside>
<script>
const svg = document.getElementById('app');
const inlineEditor = document.getElementById('inlineEditor');
const GRID = 22.4;
const HIT = 8;
const WIRE_STROKE = 2.4;
const COMPONENT_SCALE = 0.8;
const state = {
tool: 'select',
rotation: 0,
showGrid: true,
wires: [],
components: [],
junctionMap: new Map(),
selected: null,
dragging: null,
wirePreview: null,
history: [],
future: [],
nextId: 1,
viewport: { width: 1200, height: 800 },
world: { width: 2400, height: 1600 },
zoom: 1,
clipboard: null,
polarityFlipped: false,
pendingTextPlacement: false
};
let editingComp = null;
const ui = {
toolBtns: [...document.querySelectorAll('.tool-btn')],
rotateBtn: document.getElementById('rotateBtn'),
rotate180Btn: document.getElementById('rotate180Btn'),
toggleGridBtn: document.getElementById('toggleGridBtn'),
flipPolarityBtn: document.getElementById('flipPolarityBtn'),
batteryCells: document.getElementById('batteryCells'),
magnetBlocks: document.getElementById('magnetBlocks'),
magnetCoils: document.getElementById('magnetCoils'),
resistorFill: document.getElementById('resistorFill'),
updateResistorBtn: document.getElementById('updateResistorBtn'),
fontSize: document.getElementById('fontSize'),
textValue: document.getElementById('textValue'),
updateTextBtn: document.getElementById('updateTextBtn'),
statusBox: document.getElementById('statusBox'),
undoBtn: document.getElementById('undoBtn'),
redoBtn: document.getElementById('redoBtn'),
clearBtn: document.getElementById('clearBtn'),
exportBtn: document.getElementById('exportBtn'),
fitBtn: document.getElementById('fitBtn'),
zoomInBtn: document.getElementById('zoomInBtn'),
zoomOutBtn: document.getElementById('zoomOutBtn'),
zoomResetBtn: document.getElementById('zoomResetBtn')
};
function getSelectedComponent() {
return state.selected?.kind === 'component'
? state.components.find(c => c.id === state.selected.id)
: null;
}
function applyRotation(deg) {
const comp = getSelectedComponent();
if (comp) {
saveHistory();
comp.rotation = (comp.rotation + deg) % 360;
if (comp.type !== 'textbox') autoAlignComponent(comp);
rebuildJunctions();
render();
} else {
state.rotation = (state.rotation + deg) % 360;
}
}
function deepClone(obj) {
return JSON.parse(JSON.stringify(obj));
}
function saveHistory() {
state.history.push(deepClone({
wires: state.wires,
components: state.components,
nextId: state.nextId
}));
if (state.history.length > 100) state.history.shift();
state.future = [];
}
function restoreSnapshot(snapshot) {
state.wires = deepClone(snapshot.wires);
state.components = deepClone(snapshot.components);
state.nextId = snapshot.nextId;
state.selected = null;
rebuildJunctions();
render();
}
function undo() {
if (!state.history.length) return;
state.future.push(deepClone({ wires: state.wires, components: state.components, nextId: state.nextId }));
restoreSnapshot(state.history.pop());
}
function redo() {
if (!state.future.length) return;
state.history.push(deepClone({ wires: state.wires, components: state.components, nextId: state.nextId }));
restoreSnapshot(state.future.pop());
}
function snap(v) {
return Math.round(v / GRID) * GRID;
}
function keyPt(x, y) { return `${x},${y}`; }
function addJunction(x, y) {
const key = keyPt(x, y);
state.junctionMap.set(key, (state.junctionMap.get(key) || 0) + 1);
}
function segmentPoints(a, b) {
const dx = b.x - a.x;
const dy = b.y - a.y;
const steps = gcd(Math.abs(dx), Math.abs(dy)) / GRID;
if (steps <= 0) return [a];
const stepx = dx / steps;
const stepy = dy / steps;
const pts = [];
for (let i = 0; i <= steps; i++) {
pts.push({ x: Math.round(a.x + stepx * i), y: Math.round(a.y + stepy * i) });
}
return pts;
}
function gcd(a, b) {
while (b) [a, b] = [b, a % b];
return a || 1;
}
function rebuildJunctions() {
state.junctionMap = new Map();
for (const wire of state.wires) {
for (const p of segmentPoints(wire.a, wire.b)) addJunction(p.x, p.y);
}
for (const comp of state.components) {
getComponentNodes(comp).forEach(p => addJunction(p.x, p.y));
}
}
function setTool(tool) {
state.tool = tool;
state.selected = null;
ui.toolBtns.forEach(btn => btn.classList.toggle('active', btn.dataset.tool === tool));
render();
}
ui.toolBtns.forEach(btn => btn.addEventListener('click', () => setTool(btn.dataset.tool)));
ui.rotateBtn.addEventListener('click', () => applyRotation(90));
ui.rotate180Btn.addEventListener('click', () => applyRotation(180));
ui.fontSize.addEventListener('input', () => {
const comp = getSelectedComponent();
if (comp?.type === 'textbox') {
comp.fontSize = Math.max(8, Math.min(48, Number(ui.fontSize.value) || 12));
resizeTextboxToFit(comp);
syncControls();
render();
}
});
ui.updateTextBtn.addEventListener('click', () => {
const comp = getSelectedComponent();
if (!comp || comp.type !== 'textbox') {
setStatus('Select a textbox first, then use <strong>Update Text</strong>.');
return;
}
saveHistory();
comp.text = (ui.textValue.value || 'Type here').trim() || 'Type here';
comp.fontSize = Math.max(8, Math.min(48, Number(ui.fontSize.value) || 12));
resizeTextboxToFit(comp);
syncControls();
render();
});
ui.updateResistorBtn.addEventListener('click', () => {
const comp = getSelectedComponent();
if (!comp || !['resistor', 'variable-resistor', 'potentiometer', 'thermistor'].includes(comp.type)) {
setStatus('Select a resistor-based component first, then use <strong>Update Resistor</strong>.');
return;
}
saveHistory();
comp.fillPattern = ui.resistorFill.value;
syncControls();
render();
});
ui.toggleGridBtn.addEventListener('click', () => {
state.showGrid = !state.showGrid;
ui.toggleGridBtn.textContent = state.showGrid ? 'Hide Grid' : 'Show Grid';
syncControls();
render();
});
ui.flipPolarityBtn.addEventListener('click', () => {
const selectedComp = getSelectedComponent();
if (selectedComp && ['dc-supply', 'ac-supply'].includes(selectedComp.type)) {
saveHistory();
selectedComp.polarityFlipped = !selectedComp.polarityFlipped;
render();
return;
}
state.polarityFlipped = !state.polarityFlipped;
ui.flipPolarityBtn.classList.toggle('active', state.polarityFlipped);
});
ui.undoBtn.addEventListener('click', undo);
ui.redoBtn.addEventListener('click', redo);
ui.clearBtn.addEventListener('click', () => {
saveHistory();
state.wires = [];
state.components = [];
state.selected = null;
rebuildJunctions();
render();
});
ui.exportBtn.addEventListener('click', exportPNG);
ui.fitBtn.addEventListener('click', centreView);
ui.zoomInBtn.addEventListener('click', () => adjustZoom(1.2));
ui.zoomOutBtn.addEventListener('click', () => adjustZoom(1 / 1.2));
ui.zoomResetBtn.addEventListener('click', resetZoom);
// --- INLINE EDITING LOGIC ---
function startInlineEditing(comp) {
editingComp = comp;
inlineEditor.value = comp.text === 'Type here' ? '' : comp.text;
inlineEditor.style.fontSize = (comp.fontSize * state.zoom) + 'px';
const pt = svg.createSVGPoint();
pt.x = comp.x;
pt.y = comp.y;
const screenPt = pt.matrixTransform(svg.getScreenCTM());
const rect = document.querySelector('.workspace').getBoundingClientRect();
const editorW = Math.max(120, comp.width * state.zoom + 40);
const editorH = Math.max(60, comp.height * state.zoom + 40);
inlineEditor.style.left = (screenPt.x - rect.left - editorW / 2) + 'px';
inlineEditor.style.top = (screenPt.y - rect.top - editorH / 2) + 'px';
inlineEditor.style.width = editorW + 'px';
inlineEditor.style.height = editorH + 'px';
inlineEditor.style.display = 'block';
inlineEditor.focus();
inlineEditor.select();
}
function stopInlineEditing() {
if (!editingComp) return;
const newText = inlineEditor.value.trim();
if (editingComp._snapshot) {
state.history.push(editingComp._snapshot);
if (state.history.length > 100) state.history.shift();
state.future = [];
delete editingComp._snapshot;
} else {
saveHistory();
}
if (!newText) {
state.components = state.components.filter(c => c.id !== editingComp.id);
state.selected = null;
} else {
editingComp.text = newText;
resizeTextboxToFit(editingComp);
}
inlineEditor.style.display = 'none';
editingComp = null;
syncControls();
render();
}
inlineEditor.addEventListener('blur', stopInlineEditing);
inlineEditor.addEventListener('keydown', (e) => {
if (e.key === 'Enter' && !e.shiftKey) {
e.preventDefault();
stopInlineEditing();
}
if (e.key === 'Escape') {
editingComp = null;
inlineEditor.style.display = 'none';
render();
}
});
svg.addEventListener('dblclick', (evt) => {
const p = pointerToSvg(evt);
const hit = findHit(p);
if (hit?.kind === 'component') {
const comp = state.components.find(x => x.id === hit.id);
if (comp && comp.type === 'textbox') startInlineEditing(comp);
}
});
document.addEventListener('keydown', (e) => {
const tag = (e.target?.tagName || '').toLowerCase();
const isTypingTarget = tag === 'textarea' || tag === 'input';
const ctrl = e.ctrlKey || e.metaKey;
if (isTypingTarget) return;
if (ctrl && e.key.toLowerCase() === 'z' && !e.shiftKey) { e.preventDefault(); undo(); }
if (ctrl && ((e.key.toLowerCase() === 'z' && e.shiftKey) || e.key.toLowerCase() === 'y')) { e.preventDefault(); redo(); }
if (ctrl && e.key.toLowerCase() === 'c') {
if (state.selected?.kind === 'component') {
const comp = state.components.find(c => c.id === state.selected.id);
if (comp && (comp.type === 'arrow' || comp.type === 'divider-arrow')) {
e.preventDefault();
state.clipboard = deepClone(comp);
}
}
}
if (ctrl && e.key.toLowerCase() === 'v') {
if (state.clipboard && (state.clipboard.type === 'arrow' || state.clipboard.type === 'divider-arrow')) {
e.preventDefault();
saveHistory();
const c = deepClone(state.clipboard);
const dx = GRID, dy = GRID;
c.id = state.nextId++;
c.x1 += dx; c.y1 += dy; c.x2 += dx; c.y2 += dy; c.x += dx; c.y += dy;
state.components.push(c);
state.selected = { kind: 'component', id: c.id };
render();
}
}
if (e.key === 'Delete' || e.key === 'Backspace') {
if (state.selected) {
e.preventDefault();
deleteSelected();
}
}
if (e.key.toLowerCase() === 'r') {
e.preventDefault();
ui.rotateBtn.click();
}
});
function setStatus(html) {
ui.statusBox.innerHTML = html;
}
function pointerToSvg(evt) {
const pt = svg.createSVGPoint();
pt.x = evt.clientX;
pt.y = evt.clientY;
const transformed = pt.matrixTransform(svg.getScreenCTM().inverse());
return { x: transformed.x, y: transformed.y };
}
function nearestGridPoint(p) {
return { x: snap(p.x), y: snap(p.y) };
}
function componentSize(type, cells = 2, comp = null) {
if (type === 'textbox') return { w: comp?.width || 160, h: comp?.height || 60 };
if (type === 'bulb' || type === 'ammeter' || type === 'voltmeter' || type === 'galvanometer' || type === 'motor') return { w: 46.4, h: 46.4 };
if (type === 'battery') return { w: 27.2 + cells * 14.4, h: 35.2 };
if (['dc-supply', 'power-supply', 'ac-supply', 'capacitor'].includes(type)) return { w: 67.2, h: 35.2 };
if (['resistor', 'variable-resistor', 'potentiometer', 'thermistor', 'ldr', 'heater', 'fuse', 'diode', 'led', 'switch'].includes(type)) return { w: 67.2, h: 35.2 };
if (type === 'transistor') return { w: 67.2, h: 44.8 };
if (type === 'bell') return { w: 38.4, h: 38.4 };
if (type === 'magnetising-coil') return { w: 73.6, h: 27.2 };
if (type === 'transformer') return { w: 67.2, h: 89.6 };
if (type === 'solenoid') return { w: 56 * COMPONENT_SCALE, h: ((comp?.blocks || 2) * 28 + 20) * COMPONENT_SCALE };
if (type === 'ground') return { w: 35.2, h: 35.2 };
if (type === 'junction') return { w: 16, h: 16 };
if (type === 'arrow' || type === 'divider-arrow' || type === 'label-line') return { w: 44.8, h: 19.2 };
return { w: 64, h: 24 };
}
function rotatePoint(x, y, rotation) {
const rad = rotation * Math.PI / 180;
const cos = Math.cos(rad);
const sin = Math.sin(rad);
return { x: x * cos - y * sin, y: x * sin + y * cos };
}
function getComponentNodes(comp) {
const cells = comp.cells || 2;
const size = componentSize(comp.type, cells, comp);
if (comp.type === 'ground') {
if (comp.rotation % 180 === 0) return [{ x: comp.x, y: comp.y - 17.6 }];
return [{ x: comp.x - 17.6, y: comp.y }];
}
if (comp.type === 'junction') {
return [{ x: comp.x, y: comp.y }];
}
if (comp.type === 'solenoid') {
const blocks = comp.blocks || 2;
// Node connection points in unscaled world space
const localNodes = [ { x: -22.4, y: 11.2 * blocks }, { x: 22.4, y: -11.2 * blocks } ];
return localNodes.map(node => {
const rotated = rotatePoint(node.x, node.y, comp.rotation || 0);
return { x: comp.x + rotated.x, y: comp.y + rotated.y };
});
}
if (comp.type === 'transistor') {
const localNodes = [ { x: -22.4, y: 0 }, { x: 22.4, y: -22.4 }, { x: 22.4, y: 22.4 } ];
return localNodes.map(node => {
const rotated = rotatePoint(node.x, node.y, comp.rotation || 0);
return { x: comp.x + rotated.x, y: comp.y + rotated.y };
});
}
if (comp.type === 'transformer') {
const localNodes = [ { x: -22.4, y: -44.8 }, { x: -22.4, y: 44.8 } ];
return localNodes.map(node => {
const rotated = rotatePoint(node.x, node.y, comp.rotation || 0);
return { x: comp.x + rotated.x, y: comp.y + rotated.y };
});
}
if (comp.type === 'arrow' || comp.type === 'divider-arrow' || comp.type === 'label-line' || comp.type === 'textbox') {
return [];
}
if (comp.rotation % 180 === 0) {
return [ { x: comp.x - size.w / 2, y: comp.y }, { x: comp.x + size.w / 2, y: comp.y } ];
}
return [ { x: comp.x, y: comp.y - size.w / 2 }, { x: comp.x, y: comp.y + size.w / 2 } ];
}
function distance(a, b) {
return Math.hypot(a.x - b.x, a.y - b.y);
}
function pointLineDistance(p, a, b) {
const l2 = (b.x-a.x)**2 + (b.y-a.y)**2;
if (l2 === 0) return distance(p, a);
let t = ((p.x-a.x)*(b.x-a.x) + (p.y-a.y)*(b.y-a.y)) / l2;
t = Math.max(0, Math.min(1, t));
return distance(p, { x: a.x + t*(b.x-a.x), y: a.y + t*(b.y-a.y) });
}
function findHit(p) {
for (let i = state.components.length - 1; i >= 0; i--) {
const comp = state.components[i];
if (comp.type === 'arrow' || comp.type === 'divider-arrow' || comp.type === 'label-line') {
if (pointLineDistance(p, { x: comp.x1, y: comp.y1 }, { x: comp.x2, y: comp.y2 }) <= HIT) {
return { kind: 'component', id: comp.id };
}
}
const box = getComponentBounds(comp);
if (p.x >= box.x && p.x <= box.x + box.w && p.y >= box.y && p.y <= box.y + box.h) {
return { kind: 'component', id: comp.id };
}
}
for (let i = state.wires.length - 1; i >= 0; i--) {
const wire = state.wires[i];
if (pointLineDistance(p, wire.a, wire.b) <= HIT) {
return { kind: 'wire', id: wire.id };
}
}
return null;
}
function getComponentBounds(comp) {
if (comp.type === 'arrow' || comp.type === 'divider-arrow' || comp.type === 'label-line') {
const minX = Math.min(comp.x1, comp.x2), maxX = Math.max(comp.x1, comp.x2);
const minY = Math.min(comp.y1, comp.y2), maxY = Math.max(comp.y1, comp.y2);
return { x: minX - 9.6, y: minY - 9.6, w: Math.max(19.2, maxX - minX + 19.2), h: Math.max(19.2, maxY - minY + 19.2) };
}
const size = componentSize(comp.type, comp.cells || 2, comp);
const rotated = comp.rotation % 180 === 0
? { w: size.w + 12.8, h: Math.max(size.h, 27.2) + 12.8 }
: { w: Math.max(size.h, 27.2) + 12.8, h: size.w + 12.8 };
return { x: comp.x - rotated.w / 2, y: comp.y - rotated.h / 2, w: rotated.w, h: rotated.h };
}
function measureTextWidth(textValue, fontSize) {
const canvas = measureTextWidth.canvas || (measureTextWidth.canvas = document.createElement('canvas'));
const ctx = canvas.getContext('2d');
ctx.font = `${fontSize}px Arial`;
return ctx.measureText(textValue || '').width;
}
function wrapTextLines(textValue, maxWidth, fontSize) {
const textStr = String(textValue || '');
const paragraphs = textStr.split('\n');
const all = [];
for (const para of paragraphs) {
const words = para.split(/\s+/).filter(Boolean);
if (!words.length) {
all.push('');
continue;
}
let line = '';
for (const word of words) {
const trial = line ? `${line} ${word}` : word;
if (measureTextWidth(trial, fontSize) <= maxWidth || !line) line = trial;
else {
all.push(line);
line = word;
}
}
all.push(line);
}
return all.length ? all : [''];
}
function resizeTextboxToFit(comp) {
const padX = 6;
const padY = 4;
const lines = wrapTextLines(comp.text || 'Type here', Math.max(40, comp.width - padX * 2), comp.fontSize || 12);
const widest = Math.max(40, ...lines.map(line => measureTextWidth(line, comp.fontSize || 12)));
comp.width = Math.max(64, Math.ceil(widest + padX * 2));
comp.height = Math.max(24, Math.ceil(lines.length * ((comp.fontSize || 12) * 1.2) + padY * 2));
return lines;
}
function syncControls() {
const comp = getSelectedComponent();
if (comp?.type === 'textbox') {
ui.fontSize.value = comp.fontSize || 12;
ui.textValue.value = comp.text || 'Type here';
} else if (comp && ['resistor', 'variable-resistor', 'potentiometer', 'thermistor'].includes(comp.type)) {
if (comp.fillPattern) ui.resistorFill.value = comp.fillPattern;
}
}
function addComponent(type, pos) {
const snapshotBeforeAdd = deepClone({
wires: state.wires, components: state.components, nextId: state.nextId
});
const p = type === 'textbox' ? pos : nearestGridPoint(pos);
const comp = {
id: state.nextId++,
type,
x: p.x,
y: p.y,
rotation: state.rotation,
variant: type,
cells: type === 'battery' ? Math.max(1, Math.min(8, Number(ui.batteryCells.value) || 2)) : undefined,
polarityFlipped: ['dc-supply', 'ac-supply'].includes(type) ? state.polarityFlipped : false
};
if (['resistor', 'variable-resistor', 'potentiometer', 'thermistor'].includes(type)) {
comp.fillPattern = ui.resistorFill.value;
}
if (type === 'solenoid') {
comp.blocks = Math.max(2, Math.floor((Number(ui.magnetBlocks.value) || 2) / 2) * 2);
comp.coils = Math.max(1, Number(ui.magnetCoils.value) || 5);
}
if (type === 'textbox') {
comp.text = ''; // Start completely empty for smooth editing UX
comp.fontSize = Math.max(8, Math.min(48, Number(ui.fontSize.value) || 12));
comp.width = 76.8;
comp.height = 24;
resizeTextboxToFit(comp);
state.pendingTextPlacement = false;
comp._snapshot = snapshotBeforeAdd;
} else if (type === 'ground') {
if (comp.rotation % 180 === 0) comp.y += 17.6;
else comp.x += 17.6;
state.history.push(snapshotBeforeAdd);
if (state.history.length > 100) state.history.shift();
state.future = [];
} else {
autoAlignComponent(comp);
state.history.push(snapshotBeforeAdd);
if (state.history.length > 100) state.history.shift();
state.future = [];
}
state.components.push(comp);
rebuildJunctions();
state.selected = { kind: 'component', id: comp.id };
syncControls();
render();
if (type === 'textbox') {
setTimeout(() => startInlineEditing(comp), 0);
}
}
function addArrow(start, end) {
saveHistory();
const comp = {
id: state.nextId++,
type: 'arrow',
x1: start.x, y1: start.y, x2: end.x, y2: end.y,
x: (start.x + end.x) / 2,
y: (start.y + end.y) / 2,
rotation: 0,
variant: 'arrow'
};
state.components.push(comp);
state.selected = { kind: 'component', id: comp.id };
render();
}