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ui-spacetimechart: add support for HiDPI #880

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Feb 11, 2025
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ui-spacetimechart: add support for HiDPI #880

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11 changes: 9 additions & 2 deletions ui-spacetimechart/src/hooks/useCanvas.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -210,14 +210,21 @@ export function useCanvas(

// Handle resizing:
useEffect(() => {
const scale = window.devicePixelRatio || 1;

for (const id in canvasesRef.current) {
const canvas = canvasesRef.current[id];
const ctx = contextsRef.current[id];

if (canvas) {
canvas.style.width = size.width + 'px';
canvas.style.height = size.height + 'px';
canvas.setAttribute('width', size.width + 'px');
canvas.setAttribute('height', size.height + 'px');
canvas.setAttribute('width', size.width * scale + 'px');
canvas.setAttribute('height', size.height * scale + 'px');

// Reset the transform to identity, then apply the new scale
ctx.setTransform(1, 0, 0, 1, 0, 0);
ctx.scale(scale, scale);
}
}

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