What is the perpendicular distance between a point and a line?
Application for which there is no redeeming social value:
Create a line graphic "line" and an oval graphic "circle" Put the following script into a transparent radio button and then drag that button.
local myName, p2,p3
on mouseDown put the name of me into myName put the points of grc "line" into tPoints put line 1 of tPoints into p2 put line 2 of tPoints into p3 end mouseDown
on mouseUP put "" into myName end mouseUP
on mouseLeave mouseUP end mouseLeave
on mouseMove u,v if myName is "" then exit mouseMove set the loc of me to u,v put u,v into p1 put abs(perpDist(p1,p2,p3)) into tRadius set the loc of grc "circle" to u,v set the width of grc "circle" to 2*tRadius set the height of grc "circle" to 2*tRadius end mouseMove
function perpDist p1,p2,p3 --Returns the perpendicular distance --between point p1 and the line with --end points p2 and p3 put item 1 of p1 into x1 put item 2 of p1 into y1 put item 1 of p2 into x2 put item 2 of p2 into y2 put item 1 of p3 into x3 put item 2 of p3 into y3
if x3-x2 is 0 then return (x1-x2) else put (y3-y2)/(x3-x2) into m -- The slope return (m*(x1-x2)-(y1-Y2))/sqrt(1+m*m) end if
end perpDist
Jim _______________________________________________ use-revolution mailing list use-revolution@lists.runrev.com http://lists.runrev.com/mailman/listinfo/use-revolution