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How to Draw Wave-Alike Object? |
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Kent Cooper
Senior Member Joined: 12.Mar.2013 Location: United States Using: AutoCAD2020, 2023 Status: Offline Points: 632 |
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Only you can say whether putting two Circles of 10-unit diameter 11 units apart, and drawing the tangent Line between them, gives you a shape that is close enough for you to matching the waviness in your original image. As you mentioned, maybe a Spline could make a more precise match. But seriously -- how precisely does it need to match? I assume the squiggly-wavy pointer is just a graphic convention for some relationship [sub-atomic particle movement or something?], not representative of an actual physical object, so what does it matter whether the precise shape of the waviness matches exactly? And frankly, to me it looks like the end-most bulges in the original image are slightly smaller than the intermediate ones, which if true, you could construct if you really need that difference, but would not be possible with a shape-embedded linetype, which would need all bulges to be exactly the same. So what does it represent, and how much does the exactness of the wavy shape really matter?
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dery
Senior Member Joined: 31.Jan.2018 Location: United States Using: AutoCAD 2014 Status: Offline Points: 114 |
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I need to draw as similar as possible like the original pic. How do I draw it using spline please?
Can you show me please the step-by-step animation like post #5 on page 2?
Edited by dery - 24.Apr.2024 at 08:57 |
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Kent Cooper
Senior Member Joined: 12.Mar.2013 Location: United States Using: AutoCAD2020, 2023 Status: Offline Points: 632 |
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Well, this may not be any more precise about matching the wave shape, and seems like a lot of work compared to other approaches, and hugely more difficult if you need to adjust it. But I would do it with Snap turned on and a series of regularly-spaced positions. Here, Snap and Grid are both set to 1 drawing unit -- note how the cursor pops to only grid positions. I pre-positioned Points [green] just to illustrate what I was up to, but they are not needed. You will want to experiment with the arrangement for "close enough" precision. This is in a SPLINE command.
Edited by Kent Cooper - 25.Apr.2024 at 20:02 |
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dery
Senior Member Joined: 31.Jan.2018 Location: United States Using: AutoCAD 2014 Status: Offline Points: 114 |
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How do you positioned the green points location like that?
Edited by dery - 26.Apr.2024 at 10:17 |
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philippe JOSEPH
Senior Member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2017 Status: Offline Points: 1434 |
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The "good" thing to do when drawing a spline is adding start and end tangents.
In the old AutoCAD version you could do this after but now I haven't find the way to "catch" those tangents so I add multiple in line points and then trim the spline were it normaly begins and ends. Any informations about start and end tangents ? I had previously posted a discussion about that with an AutoCAD file but got no answers.
Edited by philippe JOSEPH - 26.Apr.2024 at 13:16 |
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dery
Senior Member Joined: 31.Jan.2018 Location: United States Using: AutoCAD 2014 Status: Offline Points: 114 |
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Hi Mr. Joseph. I don't know what "tangent of spline" is.
Can you explain and show me please example by pic or animation? Thank you. |
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philippe JOSEPH
Senior Member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2017 Status: Offline Points: 1434 |
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About tangent of spline, see eventually :
TEST SPLINE 01 Aa.dwgin the CAD / BIM Blocks library and / or test the command SPLINE on your computer.
Edited by philippe JOSEPH - 26.Apr.2024 at 16:18 |
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Kent Cooper
Senior Member Joined: 12.Mar.2013 Location: United States Using: AutoCAD2020, 2023 Status: Offline Points: 632 |
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With the POINT command, with Snap turned on so they are all at grid locations. They are there in the image only to illustrate -- it is not necessary to have them there if you can visually pop to positions in that kind of regular relationship. In the case of the relationship in my image, the relative position of each location is like a Knight's move in chess, but you'll need to experiment to decide whether that makes a shape enough like what you want.
Edited by Kent Cooper - 29.Apr.2024 at 14:09 |
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Kent Cooper
Senior Member Joined: 12.Mar.2013 Location: United States Using: AutoCAD2020, 2023 Status: Offline Points: 632 |
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They're in the DXF code 12 and 13 entries in entity data -- see >this<. -- or the StartTangent and EndTangent VLA properties, or in the (getpropertyvalue)/(setpropertyvalue) world, the StartFitTangent and EndFitTangent properties. You can play with them in the Properties palette, too.
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dery
Senior Member Joined: 31.Jan.2018 Location: United States Using: AutoCAD 2014 Status: Offline Points: 114 |
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Hi Mr. Cooper, may I know what software you're using to capture the sreenshot animation like your post (3rd post of page 3)?
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