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57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
/*
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Copyright (c) 2016 Jean-Marc VIGLINO,
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released under the CeCILL license (http://www.cecill.info/).
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*/
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/** Path animation: feature follow a path
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* @param {ol.featureAnimationPathOptions} options
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*/
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ol.featureAnimation.Path = function(options)
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{ options = options || {};
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ol.featureAnimation.call(this, options);
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this.speed_ = options.speed || 0;
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this.path_ = options.path;
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if (this.path_ && this.path_.getGeometry) this.path_ = this.path_.getGeometry();
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if (this.path_ && this.path_.getLineString) this.path_ = this.path_.getLineString();
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if (this.path_.getLength)
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{ this.dist_ = this.path_.getLength()
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if (this.path_ && this.path_.getCoordinates) this.path_ = this.path_.getCoordinates();
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}
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else this.dist_ = 0;
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if (this.speed_>0) this.duration_ = this.dist_/this.speed_;
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}
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ol.inherits(ol.featureAnimation.Path, ol.featureAnimation);
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/** Animate
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* @param {ol.featureAnimationEvent} e
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*/
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ol.featureAnimation.Path.prototype.animate = function (e)
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{ // First time
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if (!e.time)
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{ if (!this.dist_) return false;
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}
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var dmax = this.dist_*this.easing_(e.elapsed);
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var p0, p, dx,dy, dl, d = 0;
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p = this.path_[0];
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// Linear interpol
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for (var i = 1; i<this.path_.length; i++)
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{ p0 = p;
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p = this.path_[i];
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dx = p[0]-p0[0];
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dy = p[1]-p0[1];
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dl = Math.sqrt(dx*dx+dy*dy);
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if (dl && d+dl>=dmax)
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{ var s = (dmax-d)/dl;
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p = [ p0[0] + (p[0]-p0[0])*s, p0[1] + (p[1]-p0[1])*s];
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break;
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}
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d += dl;
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}
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e.geom.setCoordinates(p);
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// Animate
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this.drawGeom_(e, e.geom);
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return (e.time <= this.duration_);
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}
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