60 lines
1.7 KiB
Plaintext
60 lines
1.7 KiB
Plaintext
define(function (require) {
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var roamHelper = {};
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/**
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* @param {module:echarts/coord/View} view
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* @param {Object} payload
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* @param {Object} [zoomLimit]
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*/
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roamHelper.updateCenterAndZoom = function (
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view, payload, zoomLimit
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) {
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var previousZoom = view.getZoom();
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var center = view.getCenter();
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var zoom = payload.zoom;
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var point = view.dataToPoint(center);
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if (payload.dx != null && payload.dy != null) {
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point[0] -= payload.dx;
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point[1] -= payload.dy;
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var center = view.pointToData(point);
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view.setCenter(center);
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}
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if (zoom != null) {
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if (zoomLimit) {
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var zoomMin = zoomLimit.min || 0;
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var zoomMax = zoomLimit.max || Infinity;
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zoom = Math.max(
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Math.min(previousZoom * zoom, zoomMax),
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zoomMin
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) / previousZoom;
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}
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// Zoom on given point(originX, originY)
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view.scale[0] *= zoom;
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view.scale[1] *= zoom;
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var position = view.position;
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var fixX = (payload.originX - position[0]) * (zoom - 1);
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var fixY = (payload.originY - position[1]) * (zoom - 1);
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position[0] -= fixX;
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position[1] -= fixY;
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view.updateTransform();
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// Get the new center
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var center = view.pointToData(point);
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view.setCenter(center);
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view.setZoom(zoom * previousZoom);
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}
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return {
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center: view.getCenter(),
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zoom: view.getZoom()
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};
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};
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return roamHelper;
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}); |