shane_china wrote: > In openlayers, > I have a straight line with two endpoints. How could I get a point on the > line with given distance to one endpoint? Thank you. >
You can find a point anywhere on a line by using a ratio calculation. Start with the distance to your point divided by the total distance of your line, then your new X coordinate = the difference between the X coordinates of the endpoints times the ratio (plus the X coordinate of the starting line endpoint. For example, if your endpoints are at coordinates (X0, Y0) and (X1,Y1) then the Cartesian distance is D = sqrt((X1-X0)*(X1-X0) + (Y1-Y0)*(Y1-Y0)) Then if the ratio between this and the distance to your point is d, your new point's coordinates will be: X= X0+(X1-X0)*d/D Y=Y0+(Y1-Y0)*d/D HTH, - Bill Thoen _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users
