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Post by Vermin King on Jul 16, 2016 16:50:25 GMT -9
I'm trying to replicate a wheel from an old drawing, eliminating the forced perspective. I've been using Gimp, but I'm not finding a good way to make the concentric circles of the outer wheel, the inner wheel and the hub. I've found many tutorials on making 'perfect circles' which really aren't, but I'm not seeing anything on concentric circles. Can someone have pity on me and throw me a hint or point me in the direction of a useful tutorial?
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Post by gilius on Jul 16, 2016 17:26:10 GMT -9
I'd probably draw it in Inkscape, then export the bitmap (considering the need of making the circular arrays of spokes and bolts).
Other than that, I can only think:
1. Ellipse selection tool, hold Shift as you make the selection to keep it circular. 2. Edit -> Stroke Selection 3. Hold and start dragging one of the corner handles of the selection area, then hold Control and Shift as you drag. This will allow you to resize around the center, keeping the area circular. Repeat steps 2 and 3 as needed.
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Post by Vermin King on Jul 16, 2016 17:39:45 GMT -9
Thanks, I'll have to try that
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Post by mproteau (Paper Realms) on Jul 17, 2016 2:27:41 GMT -9
Couple ideas. keep in mind I'm typing this on my phone and I woke up 5 minutes ago so I might use the wrong terms for things.
You can use the round select tool to make a selection. If you lay down guides that cross in the center of your circles and make the selection tool expand from the center AND hold the shift key to make it a perfect circle, you can select the outer circle area. On a separate layer, fill the circle in black. Shrink the selection a couple pixels and press delete to erase the black. Now shrink the selection again until you're at your inner circle edge. Fill black. Shrink again and delete.
Repeat for each circle.
Remember ctrl+, and ctrl+. fill the selection with foreground/background color. Good hotkeys to know.
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Post by Vermin King on Jul 17, 2016 4:46:08 GMT -9
I'm not sure how to set those guides at the center of the circle. When I shrink circles, they seem to have their reference point at the top left of a square that just fits the circle inside it, which wouldn't be bad if I had guides in the centers. It may be a question of setting preferences, but I'm not sure
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Post by mproteau (Paper Realms) on Jul 17, 2016 5:23:03 GMT -9
If you know where you want your circle to be, you can lay down guides (pull down from the top ruler, or pull right from the ruler on the left) that cross where you want the center of the circle. With the Ellipse Select tool, there's an "Expand from center" option that will let you click at the intersection point of those guides and pull outward, and the circle selection will grow from the center. If you have a fixed aspect ratio of 1:1, you'll get a circle. When "Expand from center" is selected, the grow/shrink handles will keep the circle centered. Using the menu Select > Grow or Select > Shrink will always stay centered.
All of the options show up in the "Tool Options" dockable dialog.
I just learned there's a neat Select > Border menu option, which will take the current selection and select a number of pixels AROUND that selection. Neat.
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Post by Vermin King on Jul 17, 2016 9:06:19 GMT -9
I knew this couldn't be as difficult as I was making it. Thanks
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