64 lines
2.1 KiB
JavaScript
64 lines
2.1 KiB
JavaScript
import { $ } from './dom.js';
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import { computeHomography } from './homography.js';
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import { round, FIELD_PADDING } from './constants.js';
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function applyBgToField(field, state) {
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if (state.bgImage) {
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field.style.backgroundImage = `url(${state.bgImage})`;
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field.style.backgroundSize = state.objectFit === 'fill' ? '100% 100%' : state.objectFit;
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} else {
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field.style.backgroundImage = 'none';
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field.style.backgroundSize = '';
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}
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}
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function applyWidgetImage(widget, state) {
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if (state.widgetImage) {
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widget.style.backgroundImage = `url(${state.widgetImage})`;
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widget.style.backgroundSize = '100% 100%';
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widget.style.backgroundPosition = 'center';
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widget.style.backgroundRepeat = 'no-repeat';
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widget.querySelector('span').style.display = 'none';
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} else {
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widget.style.backgroundImage = '';
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widget.style.backgroundSize = '';
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widget.style.backgroundPosition = '';
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widget.style.backgroundRepeat = '';
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widget.querySelector('span').style.display = '';
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}
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}
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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 maxH = window.innerHeight - FIELD_PADDING;
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const scaleW = cw / state.fieldW;
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const scaleH = maxH / state.fieldH;
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const scale = Math.min(scaleW, scaleH);
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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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applyBgToField(field, state);
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const widget = $('widget');
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widget.style.width = state.widgetW + 'px';
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widget.style.height = state.widgetH + 'px';
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applyWidgetImage(widget, state);
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const H = computeHomography(state);
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if (H) {
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widget.style.transform = `matrix3d(${round(H.h00)},${round(H.h10)},0,${round(H.h20)},${round(H.h01)},${round(H.h11)},0,${round(H.h21)},0,0,1,0,${round(H.h02)},${round(H.h12)},0,${round(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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