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Code

Fixed positional accuracy for signatures

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This commit is contained in:
Saud Fatayerji 2023-05-06 18:52:30 +03:00
parent 654f7742e4
commit 0aa79d28f8
1 changed files with 32 additions and 24 deletions
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56
src/main/resources/templates/sign.html
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@ -109,7 +109,7 @@
<div id="pdf-container"> <div id="pdf-container">
<canvas id="pdf-canvas"></canvas> <canvas id="pdf-canvas"></canvas>
<canvas id="signature-canvas" hidden style="position: absolute;" data-scale="1"></canvas> <canvas id="signature-canvas" hidden style="position: absolute;"></canvas>
</div> </div>
<button id="download-pdf" class="btn btn-primary mb-2">Download PDF</button> <button id="download-pdf" class="btn btn-primary mb-2">Download PDF</button>
@ -220,8 +220,6 @@
const x = 0; const x = 0;
const y = 0; const y = 0;
signatureCanvas.style.transform = `translate(${x}px, ${y}px)`; signatureCanvas.style.transform = `translate(${x}px, ${y}px)`;
signatureCanvas.setAttribute('data-x', x);
signatureCanvas.setAttribute('data-y', y);
// calcualte the max size // calcualte the max size
const containerWidth = parseInt(getComputedStyle(pdfCanvas).width.replace('px','')); const containerWidth = parseInt(getComputedStyle(pdfCanvas).width.replace('px',''));
@ -274,17 +272,24 @@
}); });
} }
function parseTransform(element) {
const tansform = element.style.transform.replace(/[^.,-\d]/g, '');
const transformComponents = tansform.split(",");
return {
x: parseFloat(transformComponents[0]),
y: parseFloat(transformComponents[1]),
width: element.offsetWidth,
height: element.offsetHeight,
}
}
interact('#signature-canvas') interact('#signature-canvas')
.draggable({ .draggable({
listeners: { listeners: {
move: (event) => { move: (event) => {
const target = event.target; const transform = parseTransform(event.target)
const x = (parseFloat(target.getAttribute('data-x')) || 0) + event.dx; const x = (transform.x || 0) + event.dx;
const y = (parseFloat(target.getAttribute('data-y')) || 0) + event.dy; const y = (transform.y || 0) + event.dy;
event.target.style.transform = `translate(${x}px, ${y}px)`;
target.style.transform = `translate(${x}px, ${y}px)`;
target.setAttribute('data-x', x);
target.setAttribute('data-y', y);
}, },
}, },
}) })
@ -293,18 +298,12 @@
listeners: { listeners: {
move: (event) => { move: (event) => {
const target = event.target; const target = event.target;
const x = (parseFloat(target.getAttribute('data-x')) || 0);
const y = (parseFloat(target.getAttribute('data-y')) || 0);
const newWidth = event.rect.width; const newWidth = event.rect.width;
const newHeight = event.rect.height; const newHeight = event.rect.height;
const scale = newWidth / target.width;
target.style.width = newWidth + 'px'; target.style.width = newWidth + 'px';
target.style.height = newHeight + 'px'; target.style.height = newHeight + 'px';
target.setAttribute('data-scale', scale);
target.style.transform = `translate(${x}px, ${y}px)`;
}, },
}, },
modifiers: [ modifiers: [
@ -333,16 +332,25 @@
const pageIndex = 0; // Choose the page index where the signature should be added (0 is the first page) const pageIndex = 0; // Choose the page index where the signature should be added (0 is the first page)
const page = pdfDocModified.getPages()[pageIndex]; const page = pdfDocModified.getPages()[pageIndex];
const targetElement = signatureCanvas; const signatureCanvasPositionPixels = parseTransform(signatureCanvas);
const x = parseFloat(targetElement.getAttribute('data-x')) || 0; const signatureCanvasPositionRelative = {
const y = parseFloat(targetElement.getAttribute('data-y')) || 0; x: signatureCanvasPositionPixels.x / pdfCanvas.offsetWidth,
const scale = parseFloat(targetElement.getAttribute('data-scale')) || 1; y: signatureCanvasPositionPixels.y / pdfCanvas.offsetHeight,
width: signatureCanvasPositionPixels.width / pdfCanvas.offsetWidth,
height: signatureCanvasPositionPixels.height / pdfCanvas.offsetHeight,
}
const signaturePositionPdf = {
x: signatureCanvasPositionRelative.x * page.getWidth(),
y: signatureCanvasPositionRelative.y * page.getHeight(),
width: signatureCanvasPositionRelative.width * page.getWidth(),
height: signatureCanvasPositionRelative.height * page.getHeight(),
}
page.drawImage(signatureImageObject, { page.drawImage(signatureImageObject, {
x: x, x: signaturePositionPdf.x,
y: page.getHeight() - y - (targetElement.height * scale), y: page.getHeight() - signaturePositionPdf.y - signaturePositionPdf.height,
width: targetElement.width * scale, width: signaturePositionPdf.width,
height: targetElement.height * scale, height: signaturePositionPdf.height,
}); });
} }