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Constrain the center in zoomByDelta

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Thomas Chandelle
2017-01-05 14:43:54 +01:00
parent 23960d086d
commit 395d833dd6
2 changed files with 80 additions and 0 deletions
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17
src/ol/interaction/interaction.js
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@@ -180,6 +180,23 @@ ol.interaction.Interaction.zoom = function(view, resolution, opt_anchor, opt_dur
ol.interaction.Interaction.zoomByDelta = function(view, delta, opt_anchor, opt_duration) {
var currentResolution = view.getResolution();
var resolution = view.constrainResolution(currentResolution, delta, 0);
// If we have a constraint on center, we need to change the anchor so that the
// new center is within the extent. We first calculate the new center, apply
// the constraint to it, and then calculate back the anchor
if (opt_anchor && resolution !== undefined && resolution !== currentResolution) {
var currentCenter = view.getCenter();
var center = view.calculateCenterZoom(resolution, opt_anchor);
center = view.constrainCenter(center);
opt_anchor = [
(resolution * currentCenter[0] - currentResolution * center[0]) /
(resolution - currentResolution),
(resolution * currentCenter[1] - currentResolution * center[1]) /
(resolution - currentResolution)
];
}
ol.interaction.Interaction.zoomWithoutConstraints(
view, resolution, opt_anchor, opt_duration);
};