Pls. help need a routine lisp for req. area

please i need your help..fro s routine lisp for computing a target area base on three points as shown on figure below..i can solve it manually but the problem it takes a time solve it..and i could not finish my job on the field base on manual computation..like what i said it takes more time..so beg you guys.

info:

#. 3 known corners or coordinates

#. a line for reference (blue line)

#. the green line was new line base on computed area

thank in advanced

oliver

apologized ahead.. it just an update. thanks oliver

There seems to be not enough info to solve this problem. How do you solve it manually?

Why not use the parcel tools? You have LDD/C3D.

Using coordinate-area method you can come up with the formula, assuming the angle of the reference line is known.

Say the 4th side of the rectangle (the blue line) has a length of "C" with an angle "a" from the horizontal, and the rectangle has an area of "A". Point 1 has coordinates of (X1,Y1) etc.:

C=[2A-X2Y1+X1Y2-X1Y7+X7Y1+Y7X2]/[sina(X7-X2)+cosa(Y2-Y7)]

Rectangle Area.zip

There seems to be not enough info to solve this problem. How do you solve it manually?

using trial and error..what i want is a routine lisp which can be easily for me.

I'll say it again, what about the parcel tools built into LDD/C3D?

I'll say it again, what about the parcel tools built into LDD/C3D?

ok i use too..thanks for remind that:)

but its ok..f someone just make easier for us.

oliver

This reminds me of something....

thanks for that Lee..but the result was only perpendicular to the baseline.

So oliver, did not the formula I posted solve directly for the unknown length of the side along the reference line? Or are you looking for a general purpose lisp routine for all situations?

Or are you looking for a general purpose lisp routine for all situations?

i love too

OK I thought it was an interesting challenge, got me to brush up on some basic algebra. So here's a routine to determine the lot line location to produce the required area. Property to be made up of only straight line segments. Not polished, little error trapping, assumes user can pick property corners in order, clockwise.

LotLine.lsp