31 lines
1008 B
JavaScript
31 lines
1008 B
JavaScript
import { computeHomography } from './homography.js';
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function $(id) { return document.getElementById(id); }
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export function updateLivePreview(state) {
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const container = $('fieldContainer');
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const cw = container.clientWidth;
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if (cw <= 0) return;
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const scale = cw / state.fieldW;
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const field = $('field');
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field.style.width = state.fieldW + 'px';
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field.style.height = state.fieldH + 'px';
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field.style.transform = `scale(${scale})`;
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container.style.height = (state.fieldH * scale) + 'px';
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const widget = $('widget');
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widget.style.width = state.widgetW + 'px';
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widget.style.height = state.widgetH + 'px';
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const H = computeHomography(state);
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if (H) {
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const n = v => parseFloat(v.toFixed(6));
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widget.style.transform = `matrix3d(${n(H.h00)},${n(H.h10)},0,${n(H.h20)},${n(H.h01)},${n(H.h11)},0,${n(H.h21)},0,0,1,0,${n(H.h02)},${n(H.h12)},0,${n(H.h22)})`;
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widget.style.opacity = '1';
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} else {
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widget.style.transform = 'none';
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widget.style.opacity = '0.3';
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}
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}
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