How to calculate the hatch pattern line distance

[aravinthaan@yahoo.co.in]

Dear All,

 

I am using line pattern to hatch a object.I want to know the procedure to find the no of lines to appear in that rectangle area(if i am using rectangle object),distance between two lines in the hatch object based on given scale factor.For example i am going to hatch 400 * 500 area rectangle means what is the calculation to find number of horizontal lines to appear in the hatch object and the distance between two lines in the hatch object(scale factor is 1 and angle is 0).If anybody know guide me.

[ReMark]

What would be the purpose of this exercise? Is it critical to have a certain number of lines in any given hatch pattern?

[Tiger]

Puzzles me as well. If the number of lines is important I would use Array instead of a Hatch.

[ReMark]

I think you'd have to use a hatch pattern specific multiplier times the drawing scale factor to achieve the results you are looking for. Otherwise, follow Tiger's advice.

[BIGAL]

Ok a couple of clues about hatch patterns if you look in the acad.pat files.

 

Look at the numbers hey .125 .25 .5 yes 1/8" 1/4" 1/2" you can work out a scale factor so when you draw the hatch pattern comes out at exactly an even known spacing.

 

*ANSI32, ANSI Steel

45, 0,0, 0,.375

45, .176776695,0, 0,.375

 

hey .375 =3/8" Ok now it gets tricky if you want metric scales you must remember 1"=25.4mm

 

*NET, Horizontal / vertical grid

0, 0,0, 0,.125 as above 1/8" so scale factor to get 100mm squares 0.125*25.4 =3.175 ok sound good didn't work autocad at work again doing something weird with feet to metric answer seems to be scale 31.496 totaly confused I am.

 

Do it the easy way change the numbers in the hatch pattern to match what you want and give the pattern a new name.

 

*NET100, Horizontal / vertical grid100spacing

0, 0,0, 0,100

 

just checked acadiso.pat and net is 0, 0, 0, 0, 3.175

90, 0, 0, 0, 3.175 which matches above calcs

[BIGAL]

Just to confuse a bit more remembered answer scale "net" to 8 = should now be 8x.125 = 1 ?? drawing gives 25.4 units ie 1"=25.4 mm so say a net 100mm squares = 100/25.4*8 =31.496 as above whew! now I know why I made fixed size patterns once I figured out the scale.

 

We do draw our road storm water pipes 2.4 long in plans then you can count them as a approx order method re reason to do so in first place.