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Ensure that the first point for kinetic is valid

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tsauerwein
2014-07-18 16:07:59 +02:00
parent 02a2c5aceb
commit 73951394f9
1 changed files with 16 additions and 11 deletions
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27
src/ol/kinetic.js
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@@ -81,25 +81,30 @@ ol.Kinetic.prototype.update = function(x, y) {
* @return {boolean} Whether we should do kinetic animation.
*/
ol.Kinetic.prototype.end = function() {
if (this.points_.length < 6) {
// at least 2 points are required (i.e. there must be at least 6 elements
// in the array)
return false;
}
var delay = goog.now() - this.delay_;
var lastIndex = this.points_.length - 3;
if (this.points_[lastIndex + 2] < delay) {
// the user stopped panning before releasing the map
// the last tracked point is too old, which means that the user stopped
// panning before releasing the map
return false;
}
// get the first point which still falls into the delay time
var firstIndex = lastIndex - 3;
while (firstIndex >= 0 && this.points_[firstIndex + 2] > delay) {
while (firstIndex > 0 && this.points_[firstIndex + 2] > delay) {
firstIndex -= 3;
}
if (firstIndex >= 0) {
var duration = this.points_[lastIndex + 2] - this.points_[firstIndex + 2];
var dx = this.points_[lastIndex] - this.points_[firstIndex];
var dy = this.points_[lastIndex + 1] - this.points_[firstIndex + 1];
this.angle_ = Math.atan2(dy, dx);
this.initialVelocity_ = Math.sqrt(dx * dx + dy * dy) / duration;
return this.initialVelocity_ > this.minVelocity_;
}
return false;
var duration = this.points_[lastIndex + 2] - this.points_[firstIndex + 2];
var dx = this.points_[lastIndex] - this.points_[firstIndex];
var dy = this.points_[lastIndex + 1] - this.points_[firstIndex + 1];
this.angle_ = Math.atan2(dy, dx);
this.initialVelocity_ = Math.sqrt(dx * dx + dy * dy) / duration;
return this.initialVelocity_ > this.minVelocity_;
};