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circles.html
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<!DOCTYPE html>
<html>
<head>
<title>Drawing Circles and Lines</title>
<style>
body {
margin: 0;
overflow: hidden;
background-color: #f0f0f0;
}
.container {
width: 100vw;
height: 100vh;
position: relative;
background-image:
linear-gradient(to right, lightgray 1px, transparent 1px),
linear-gradient(to bottom, lightgray 1px, transparent 1px);
background-size: 25px 25px;
cursor: grab;
}
.container:active {
cursor: grabbing;
}
.fixed-point {
width: 1px;
height: 1px;
background-color: gray;
position: absolute;
display: none;
}
.line {
position: absolute;
background-color: black;
transform-origin: 0 0;
height: 1px;
}
.vector {
position: absolute;
background-color: red;
width: 1px;
}
.circle {
border: 1px solid rgba(0, 0, 0, 0.5);
border-radius: 50%;
position: absolute;
transform: translate(-50%, -50%);
pointer-events: none;
}
.drawn-circle {
border: 1px solid black;
}
.handle {
width: 10px;
height: 10px;
background-color: red;
border-radius: 50%;
position: absolute;
top: 50%;
left: 100%;
transform: translate(0, -50%);
cursor: grab;
}
.controls {
position: absolute;
bottom: 20px;
right: 20px;
}
.container {
cursor: crosshair;
}
</style>
</head>
<body>
<div class="container">
<div class="fixed-point"></div>
<div class="circle"></div>
<div class="line"></div>
</div>
<div class="controls">
Grid Size: <span id="grid-size">25</span>
<button id="increase-grid">+</button>
<button id="decrease-grid">-</button>
<button id="undo">Undo</button>
<button id="redo">Redo</button>
</div>
<script>
const container = document.querySelector('.container');
const fixedPoint = document.querySelector('.fixed-point');
const circle = document.querySelector('.circle');
const line = document.querySelector('.line');
const gridSizeDisplay = document.getElementById('grid-size');
const increaseGridBtn = document.getElementById('increase-grid');
const decreaseGridBtn = document.getElementById('decrease-grid');
const undoBtn = document.getElementById('undo');
const redoBtn = document.getElementById('redo');
let gridSize = 25;
let isDragging = false;
let isDrawingLine = false;
let isResizing = false;
let isPanning = false; // Add panning flag
let initialX, initialY;
let originX, originY;
let offsetX = 0;
let offsetY = 0;
let resizingCircle = null;
let lastRadius = 0;
let history = [];
let historyIndex = -1;
let scale = 1;
gridSizeDisplay.textContent = gridSize;
document.addEventListener('contextmenu', (e) => e.preventDefault());
increaseGridBtn.addEventListener('click', () => {
gridSize += 5;
gridSizeDisplay.textContent = gridSize;
updateBackgroundGrid();
});
decreaseGridBtn.addEventListener('click', () => {
gridSize = Math.max(5, gridSize - 5);
gridSizeDisplay.textContent = gridSize;
updateBackgroundGrid();
});
function updateBackgroundGrid() {
container.style.backgroundSize = `${gridSize}px ${gridSize}px`;
}
undoBtn.addEventListener('click', () => {
if (historyIndex >= 0) {
historyIndex--;
redrawFromHistory();
}
});
redoBtn.addEventListener('click', () => {
if (historyIndex < history.length - 1) {
historyIndex++;
redrawFromHistory();
}
});
function redrawFromHistory() {
container.innerHTML = '';
container.appendChild(fixedPoint);
container.appendChild(circle);
container.appendChild(line);
for (let i = 0; i <= historyIndex; i++) {
const elementData = history[i];
const element = document.createElement('div');
element.classList.add(elementData.class);
for (const [style, value] of Object.entries(elementData.styles)) {
element.style[style] = value;
}
container.appendChild(element);
if (elementData.class === 'circle') {
const handle = document.createElement('div');
handle.classList.add('handle');
element.appendChild(handle);
addHandleListeners(element);
}
}
}
document.addEventListener('mousedown', (e) => {
if (e.button === 0 && e.altKey) {
const newCircle = drawCircle(lastRadius * 2, e.clientY, e.clientX);
addToHistory(newCircle);
} else if (e.button === 0 && e.ctrlKey) {
isResizing = true;
resizingCircle = e.target.closest('.drawn-circle');
if (resizingCircle) {
originX = resizingCircle.offsetLeft + resizingCircle.offsetWidth / 2;
originY = resizingCircle.offsetTop + resizingCircle.offsetHeight / 2;
}
} else if (e.button === 0) {
isDragging = true;
initialX = e.clientX;
initialY = e.clientY;
originX = e.clientX;
originY = e.clientY;
fixedPoint.style.left = `${originX}px`;
fixedPoint.style.top = `${originY}px`;
fixedPoint.style.display = 'block';
circle.style.width = `${lastRadius * 2}px`;
circle.style.height = `${lastRadius * 2}px`;
circle.style.left = `${originX}px`;
circle.style.top = `${originY}px`;
} else if (e.button === 1) { // Middle mouse button for panning
isPanning = true;
offsetX = container.offsetLeft - e.clientX;
offsetY = container.offsetTop - e.clientY;
} else if (e.button === 2) {
isDrawingLine = true;
initialX = e.clientX;
initialY = e.clientY;
originX = e.clientX;
originY = e.clientY;
line.style.width = '0px';
line.style.left = `${originX}px`;
line.style.top = `${originY}px`;
}
});
document.addEventListener('mouseup', (e) => {
if (isDragging) {
isDragging = false;
const newCircle = drawCircle(circle.offsetWidth, circle.offsetTop, circle.offsetLeft);
addToHistory(newCircle);
circle.style.width = '0px';
circle.style.height = '0px';
fixedPoint.style.display = 'none';
lastRadius = newCircle.offsetWidth / 2;
} else if (isDrawingLine) {
isDrawingLine = false;
const newLine = drawLine(line.offsetWidth, line.offsetTop, line.offsetLeft, line.style.transform);
addToHistory(newLine);
line.style.width = '0px';
line.style.transform = 'rotate(0deg)';
} else if (isResizing) {
isResizing = false;
resizingCircle = null;
} else if (isPanning) {
isPanning = false;
}
});
function addToHistory(element) {
history = history.slice(0, historyIndex + 1);
history.push({
class: Array.from(element.classList).join(' '),
styles: {
width: element.style.width,
height: element.style.height,
top: element.style.top,
left: element.style.left,
transform: element.style.transform
}
});
historyIndex++;
}
document.addEventListener('mousemove', (e) => {
if (isDragging) {
handleCircleDragging(e);
} else if (isDrawingLine) {
handleLineDrawing(e);
} else if (isResizing && resizingCircle) {
handleCircleResizing(e);
} else if (isPanning) { // Panning with middle mouse button
container.style.left = `${e.clientX + offsetX}px`;
container.style.top = `${e.clientY + offsetY}px`;
}
});
function handleCircleDragging(e) {
e.preventDefault();
const deltaX = e.clientX - originX;
const deltaY = e.clientY - originY;
let distance = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
if (e.shiftKey) {
const snapPoints = findSnapPoints(e.clientX, e.clientY);
if (snapPoints.length > 0) {
const closestSnapPoint = snapPoints.reduce((closest, current) => {
const closestDistance = Math.sqrt(
Math.pow(closest.x - originX, 2) + Math.pow(closest.y - originY, 2)
);
const currentDistance = Math.sqrt(
Math.pow(current.x - originX, 2) + Math.pow(current.y - originY, 2)
);
return currentDistance < closestDistance ? current : closest;
});
distance = Math.sqrt(
Math.pow(closestSnapPoint.x - originX, 2) + Math.pow(closestSnapPoint.y - originY, 2)
);
} else {
distance = Math.round(distance / gridSize) * gridSize;
}
}
circle.style.width = `${distance * 2}px`;
circle.style.height = `${distance * 2}px`;
circle.style.left = `${originX}px`;
circle.style.top = `${originY}px`;
line.style.width = `${distance}px`;
line.style.left = `${originX}px`;
line.style.top = `${originY}px`;
const angle = Math.atan2(deltaY, deltaX) * (180 / Math.PI);
line.style.transform = `rotate(${angle}deg)`;
const vector = container.querySelector('.vector');
if (vector) {
vector.style.height = `${distance}px`;
}
}
function handleLineDrawing(e) {
e.preventDefault();
let deltaX = e.clientX - originX;
let deltaY = e.clientY - originY;
if (e.shiftKey) {
const snapPoints = findSnapPoints(e.clientX, e.clientY);
if (snapPoints.length > 0) {
const closestSnapPoint = snapPoints.reduce((closest, current) => {
const closestDistance = Math.sqrt(
Math.pow(closest.x - originX, 2) + Math.pow(closest.y - originY, 2)
);
const currentDistance = Math.sqrt(
Math.pow(current.x - originX, 2) + Math.pow(current.y - originY, 2)
);
return currentDistance < closestDistance ? current : closest;
});
deltaX = closestSnapPoint.x - originX;
deltaY = closestSnapPoint.y - originY;
} else {
const angle = Math.atan2(deltaY, deltaX) * (180 / Math.PI);
const snappedAngle = Math.round(angle / 45) * 45;
const distance = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
deltaX = Math.cos(snappedAngle * (Math.PI / 180)) * distance;
deltaY = Math.sin(snappedAngle * (Math.PI / 180)) * distance;
}
}
line.style.width = `${Math.sqrt(deltaX * deltaX + deltaY * deltaY)}px`;
line.style.transform = `rotate(${Math.atan2(deltaY, deltaX) * (180 / Math.PI)}deg)`;
}
function handleCircleResizing(e) {
e.preventDefault();
const deltaX = e.clientX - originX;
const deltaY = e.clientY - originY;
let newDiameter = Math.sqrt(deltaX * deltaX + deltaY * deltaY) * 2;
if (e.shiftKey) {
newDiameter = Math.round(newDiameter / gridSize) * gridSize;
}
resizingCircle.style.width = `${newDiameter}px`;
resizingCircle.style.height = `${newDiameter}px`;
const handle = resizingCircle.querySelector('.handle');
if (handle) {
handle.style.left = `${newDiameter}px`;
}
}
function addVector(x, y, length) {
const vector = document.createElement('div');
vector.classList.add('vector');
vector.style.left = `${x}px`;
vector.style.top = `${y - length}px`;
vector.style.height = `${length}px`;
container.appendChild(vector);
}
function drawCircle(diameter, top, left) {
const drawnCircle = document.createElement('div');
drawnCircle.classList.add('circle');
drawnCircle.classList.add('drawn-circle');
drawnCircle.style.width = `${diameter}px`;
drawnCircle.style.height = `${diameter}px`;
drawnCircle.style.top = `${top}px`;
drawnCircle.style.left = `${left}px`;
container.appendChild(drawnCircle);
const handle = document.createElement('div');
handle.classList.add('handle');
drawnCircle.appendChild(handle);
addHandleListeners(drawnCircle);
return drawnCircle;
}
function addHandleListeners(circle) {
const handle = circle.querySelector('.handle');
let isHandleDragging = false;
let handleOffsetX, handleOffsetY;
handle.addEventListener('mousedown', (e) => {
isHandleDragging = true;
handleOffsetX = circle.offsetWidth + handle.offsetLeft - e.clientX;
handleOffsetY = handle.offsetTop - e.clientY;
});
document.addEventListener('mouseup', (e) => {
if (isHandleDragging) {
isHandleDragging = false;
}
});
document.addEventListener('mousemove', (e) => {
if (!isHandleDragging) return;
e.preventDefault();
let newDiameter = e.clientX + handleOffsetX - circle.offsetLeft;
newDiameter = Math.max(0, newDiameter);
if (e.shiftKey) {
newDiameter = Math.round(newDiameter / gridSize) * gridSize;
}
circle.style.width = `${newDiameter}px`;
circle.style.height = `${newDiameter}px`;
handle.style.left = `${newDiameter}px`;
});
}
function drawLine(length, top, left, transform) {
const drawnLine = document.createElement('div');
drawnLine.classList.add('line');
drawnLine.style.width = `${length}px`;
drawnLine.style.height = '1px';
drawnLine.style.top = `${top}px`;
drawnLine.style.left = `${left}px`;
drawnLine.style.transform = transform;
drawnLine.style.backgroundColor = 'black';
container.appendChild(drawnLine);
return drawnLine;
}
function findSnapPoints(x, y) {
const snapPoints = [];
const elements = container.querySelectorAll('.drawn-circle, .line');
elements.forEach(element => {
if (element.classList.contains('drawn-circle')) {
const radius = element.offsetWidth / 2;
const centerX = element.offsetLeft + radius;
const centerY = element.offsetTop + radius;
const distance = Math.sqrt(Math.pow(x - centerX, 2) + Math.pow(y - centerY, 2));
if (Math.abs(distance - radius) < 5) {
snapPoints.push({ x: centerX, y: centerY });
}
} else if (element.classList.contains('line')) {
const rect = element.getBoundingClientRect();
if (Math.abs(x - rect.left) < 5 && Math.abs(y - rect.top) < 5) {
snapPoints.push({ x: rect.left, y: rect.top });
} else if (Math.abs(x - rect.right) < 5 && Math.abs(y - rect.bottom) < 5) {
snapPoints.push({ x: rect.right, y: rect.bottom });
}
}
});
return snapPoints;
}
container.addEventListener('wheel', (e) => {
e.preventDefault();
const zoomFactor = e.deltaY > 0 ? 0.9 : 1.1;
scale *= zoomFactor;
container.style.transform = `scale(${scale})`;
});
</script>
</body>
</html>