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- function updateCenterAndZoom(view, payload, zoomLimit) {
- var previousZoom = view.getZoom();
- var center = view.getCenter();
- var zoom = payload.zoom;
- var point = view.dataToPoint(center);
- if (payload.dx != null && payload.dy != null) {
- point[0] -= payload.dx;
- point[1] -= payload.dy;
- var center = view.pointToData(point);
- view.setCenter(center);
- }
- if (zoom != null) {
- if (zoomLimit) {
- var zoomMin = zoomLimit.min || 0;
- var zoomMax = zoomLimit.max || Infinity;
- zoom = Math.max(Math.min(previousZoom * zoom, zoomMax), zoomMin) / previousZoom;
- }
- view.scale[0] *= zoom;
- view.scale[1] *= zoom;
- var position = view.position;
- var fixX = (payload.originX - position[0]) * (zoom - 1);
- var fixY = (payload.originY - position[1]) * (zoom - 1);
- position[0] -= fixX;
- position[1] -= fixY;
- view.updateTransform();
- var center = view.pointToData(point);
- view.setCenter(center);
- view.setZoom(zoom * previousZoom);
- }
- return {
- center: view.getCenter(),
- zoom: view.getZoom()
- };
- }
- exports.updateCenterAndZoom = updateCenterAndZoom;
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