cione-comp-lib
Version:
`$ yarn add cione-comp-lib` 或者 `$ npm i cione-comp-lib -S`
36 lines (35 loc) • 1.2 kB
JavaScript
function getCenterCoord(view, point) {
return view.pointToProjected ? view.pointToProjected(point) : view.pointToData(point);
}
function updateCenterAndZoom(view, payload, zoomLimit, api) {
var previousZoom = view.getZoom();
var center = view.getCenter();
var zoom = payload.zoom;
var point = view.projectedToPoint ? view.projectedToPoint(center) : view.dataToPoint(center);
if (payload.dx != null && payload.dy != null) {
point[0] -= payload.dx;
point[1] -= payload.dy;
view.setCenter(getCenterCoord(view, point), api);
}
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.scaleX *= zoom;
view.scaleY *= zoom;
var fixX = (payload.originX - view.x) * (zoom - 1);
var fixY = (payload.originY - view.y) * (zoom - 1);
view.x -= fixX;
view.y -= fixY;
view.updateTransform();
view.setCenter(getCenterCoord(view, point), api);
view.setZoom(zoom * previousZoom);
}
return {
center: view.getCenter(),
zoom: view.getZoom()
};
}
export { updateCenterAndZoom };