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Add constrainRotation option to ol.View2D

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This commit is contained in:
Tom Payne
2014-01-27 15:13:50 +01:00
parent 07a717d967
commit 3196afb4c7
2 changed files with 16 additions and 1 deletions
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5
src/objectliterals.jsdoc
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@@ -91,6 +91,11 @@
* The coordinate system for the center is specified with the `projection`
* option. Default is `undefined`, and layer sources will not be fetched if
* this is not set.
* @property {boolean|number|undefined} constrainRotation Rotation constraint.
* `false` means no constraint. `true` means no constraint, but snap to
* zero near zero. A number constraints the rotation to that number of
* values. For example, `4` will constrain the rotation to 0, 90, 180, and
* 270 degrees. The default is `true`.
* @property {boolean|undefined} enableRotation Enable rotation. Default is
* `true`.
* @property {ol.Extent|undefined} extent The extent that constrains the center,

12
src/ol/view2d.js
View File

@@ -572,7 +572,17 @@ ol.View2D.createRotationConstraint_ = function(options) {
var enableRotation = goog.isDef(options.enableRotation) ?
options.enableRotation : true;
if (enableRotation) {
return ol.RotationConstraint.createSnapToZero();
var constrainRotation = options.constrainRotation;
if (!goog.isDef(constrainRotation) || constrainRotation === true) {
return ol.RotationConstraint.createSnapToZero();
} else if (constrainRotation === false) {
return ol.RotationConstraint.none;
} else if (goog.isNumber(constrainRotation)) {
return ol.RotationConstraint.createSnapToN(constrainRotation);
} else {
goog.asserts.fail();
return ol.RotationConstraint.none;
}
} else {
return ol.RotationConstraint.disable;
}