idraw/packages/board/example/features/lib/scale.js

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const input = document.querySelector('#scale');
let hasInited = false;
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export function doScale(board) {
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if (hasInited === true) return;
input.addEventListener('change', () => {
const val = input.value * 1;
if (val > 0) {
board.scale(val);
board.draw();
}
});
hasInited = true;
}