On 12/26/05, Toon Van de Putte <[EMAIL PROTECTED]> wrote: > > Hi, > > I've got a math question: > > How can i find the x,y coordinates of a point at a known equal distance > from > two other, known, points?
Well if it is strictly a math question the most straightforward way might be analytic: solve the system of two equations for the circles of radius d about the two points, as shown at http://www.ping.be/~ping1339/circle.htm#Intersection-points- But I guess you might be wanting to find a code solution. I think I have an idea: Use matrix operations to rotate the line connecting P1 and P2 to horizontal and translate it to the X axis with midpoint at the origin. Concat these operations into a single Matrix. The desired point(s) will now be found on the y axis with ordinate equal to + or - sqrt(d * d - x * x), where d is your desired distance and x is the current transformed abscissa of P2 (if d >= x that is). The invert the matrix and apply it to the points you found. What do you think? -A _______________________________________________ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
