topic Re: Learning Hatch pattern Confuse in AutoCAD Forum

Learning Hatch pattern Confuse

Anonymous — Wed, 24 May 2017 18:26:09 GMT

Hi All

i am Learning to create custom hatch pattern. and i try to understand AutoCAD hatch pattern but i don't understand these 2 hatch

as i Understand Hatch pattern is (Angle , OrgX, OrgY, DeltaX, DeltaY, +00(Line) 0(dot) and -000 (is Gap);

so in the Angle Hatch pattern there is no DeltaX in the second 90 deg line. how it create Line in the x offset?

*ANGLE, Angle steel

0, 0,0, 0,.275, .2,-.075

90, 0,0, 0,.275, .2,-.075

And Second is

Rename of Solid "this does not work as AutoCAD solid hatch.. Why?

*ReSolid, ReSolid

45, 0,0, 0,.125

Thanks in Advance.

Re: Learning Hatch pattern Confuse

Kent1Cooper — Wed, 24 May 2017 19:27:57 GMT

@Anonymous wrote:

....

as i Understand Hatch pattern is (Angle , OrgX, OrgY, DeltaX, DeltaY, +00(Line) 0(dot) and -000 (is Gap);

so in the Angle Hatch pattern there is no DeltaX in the second 90 deg line. how it create Line in the x offset?

*ANGLE, Angle steel

0, 0,0, 0,.275, .2,-.075

90, 0,0, 0,.275, .2,-.075

And Second is

Rename of Solid "this does not work as AutoCAD solid hatch.. Why?

*ReSolid, ReSolid

45, 0,0, 0,.125

....

The first one is because of something that's often confusing -- while the X and Y coordinates of the origin point for a lineset [in this case the 0,0 entries in both linesets] is in relation to "World" orientation, the X and Y offsets [in this case the 0,.275 entries in both linesets] are in relation to the angle at the beginning of the definition line, and not to the "World" orientation. So for a 90-degree lineset, "X" is upward [in that 90-degree direction] rather than to the right, and in relation to that orientation, there is no X offset for that lineset.

As to the second one, I believe the SOLID definition is a kind of "stand-in," and AutoCAD really does it differently somehow based on the SOLID name specifically, so giving that same definition line a different name will give you the "literal" result of that definition. But I do have to ask: why would you want to use a SOLID pattern under a different name?

Re: Learning Hatch pattern Confuse

Anonymous — Wed, 24 May 2017 20:03:29 GMT

hi Kent Cooper

Thanks for reply.

so for the first one.. if angle rotate, it mean Delta X and Delta Y also Rotate.

like 45, 0,0, 0.5,0.5, 0.5,-0.5

so when it draw it will rotate Delta X and Delta Y from the 0,0 . is that correct? is is apply to all hatch pattern? or just in some case.

because i check and i did not get .1767766 in any dimension in this hatch. is am i missing any thing or am i not understanding some thing.

*FLEX, Flexible material
0, 0,0, 0,.25, .25,-.25
45, .25,0, .176776695296,.176776695296, .0625,-.2285533906

for the solid i am just testing as i mansion i am learning to create hatch pattern.

Re: Learning Hatch pattern Confuse

Kent1Cooper — Wed, 24 May 2017 20:17:16 GMT

@Anonymous wrote:

.... i did not get .1767766 in any dimension in this hatch. is am i missing any thing or am i not understanding some thing.

....

Re: Learning Hatch pattern Confuse

Anonymous — Wed, 24 May 2017 20:21:15 GMT

oh..... i see..

so it mean that delta x and delta y also rotate as per angle....

Thanks for clear me.

Re: Learning Hatch pattern Confuse

ambrosl — Wed, 24 May 2017 20:27:57 GMT

I will try to explain to you what is happening in a hatch pattern.

angle, x-origin,y-origin, delta-x,delta-y, dash-1,dash-2, …

angle, - Specifies the angle in which the line segment should be drawn based on the current UCS; think of this as rotating the UCS around the specified origin and that the line segment is always drawn along the X-axis

x-origin,y-origin, - Specifies the point origin in which the line segment should be started from

delta-x,delta-y, - Specifies an offset from the origin

dash-1,dash-2, - Specifies the dash gap sequence in which the line segment should be drawn

Re: Learning Hatch pattern Confuse

Anonymous — Wed, 24 May 2017 20:34:53 GMT

Hi Lee. thanks for reply...

Now i understand..

Thanks Again