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app.js
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app.js
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const canvas = document.querySelector('canvas');
const form = document.querySelector('.signature-pad-form');
const clearBtn = document.querySelector('.clear-button');
const ctx = canvas.getContext('2d');
let writingMode = false;
const handlePointerDown = (event) => {
writingMode = true;
ctx.beginPath();
const [posX, posY] = getCursorPosition(event);
ctx.moveTo(posX, posY);
}
const handlePointerUp = () => {
writingMode = false;
}
const handlePointerMove = (event) => {
if (!writingMode) return;
const [posX, posY] = getCursorPosition(event);
ctx.lineTo(posX, posY);
ctx.stroke();
}
const getCursorPosition = (event) => {
positionX = event.clientX - event.target.getBoundingClientRect().x;
positionY = event.clientY - event.target.getBoundingClientRect().y;
return [positionX, positionY];
}
ctx.lineWidth = 3;
ctx.lineJoin = ctx.lineCap = 'round';
form.addEventListener('submit', (event) => {
event.preventDefault();
const url = canvas.toDataURL();
const img = document.createElement('img');
img.src = url;
img.height = canvas.height;
img.width = canvas.width;
img.style.marginTop = '0.3rem';
img.style.marginBottom = '1.5rem';
img.style.border = '3px solid teal';
img.style.borderRadius = '5px';
img.style.display = 'block';
const downloadLink = document.createElement('a');
downloadLink.href = url;
downloadLink.classList.add('download');
downloadLink.innerHTML = 'Download';
downloadLink.setAttribute('download', "download");
form.appendChild(img);
form.appendChild(downloadLink);
clearPad();
});
const clearPad = () => {
ctx.clearRect(0, 0, canvas.width, canvas.height);
}
clearBtn.addEventListener('click', (event) => {
event.preventDefault();
clearPad();
});
canvas.addEventListener('pointerdown', handlePointerDown, {passive: true});
canvas.addEventListener('pointerup', handlePointerUp, {passive: true});
canvas.addEventListener('pointermove', handlePointerMove, {passive: true});