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move fingerprinting into polygons utility class

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This commit is contained in:
Stewart Allen 2020-02-11 09:27:34 -05:00
commit 674bb48689
6 changed files with 98 additions and 59 deletions
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7
js/geo-polygon.js
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@ -45,6 +45,7 @@ var gs_base_polygon = exports;
this.length = 0; // number of points
this.points = []; // ordered array of points
this.area2 = 0.0; // computed as 2x area (sign = direction)
this.perim = 0.0; // for caching the result
this.bounds = new Bounds();
this.inner = null; // array of enclosed polygons (if any)
this.parent = null; // enclosing parent polygon
@ -799,13 +800,17 @@ var gs_base_polygon = exports;
* @returns {number} perimeter length (sum of all segment lengths)
*/
PRO.perimeter = function() {
if (this.perim !== 0.0) {
return this.perim;
}
var len = 0.0;
this.forEachSegment(function(prev,next) {
len += SQRT(prev.distToSq2D(next));
}, this.open);
return len;
return this.perim = len;
};
PRO.perimeterDeep = function() {