[mkgmap-dev] Curvy routing support: new function?
From Manfred Brenneisen Manfred.Brenneisen at gmx.net on Tue Jul 1 21:02:42 BST 2014
Hi all, Garmin offers "curvy roads" preferences for their zümo 390 and 590 devices. https://buy.garmin.com/en-US/US/on-the-road/motorcycles/zumo-390lm/prod138275.html I'm thinking about creating motorcycle maps for old 200 series. Might it be useful to integrate a curviness() function so that mkgmap can optimize for curvy roads too? It might also help do determine a better default speed for curvy roads for use with car routing. The curviness() value might be the overall absolute turning angle (in degrees) of a road segment divided by the segment's length. What's your opinion? Cheers Manfred Pseudo code might look like this: function curviness() { oldpoint=points(0) foreach (point of a way segment as newpoint) { d_x=(newpoint.x-oldpoint.x)/360*40000000*COS(newpoint.x*PI()/180) //in meters d_y=(newpoint.y-oldpoint.y)/360*40000000 //in meters length+=sqrt(d_x**2+d_y**2) angle=arctan(d_y/d_x) d_angle=abs(angle-old_angle) sgn_x=sgn(d_x) sgn_y=sgn(d_y) if ((sgn_x*sgn_y*old_sgn_x*old_sgn_y)=-1 && (sgn_x!=old_sgn_x)) d_angle=pi-d_angle // 180 degrees correction, otherwise north-south roads show strange results if (point>1) sum_angle+=d_angle old_angle=angle oldpoint=newpoint old_sgn_x=sgn_x old_sgn_y=sgn_y } return sum_angle/length } // perhaps simple multiplication is faster than 4 times sgn() functions?
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