Ruler similar to apple notes app (ios9)
I don't know if there is an API for that, but this ruler is awesome and far better to draw technical stuff than the simple shape recognition (which is awesome, too).

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Elizabeth Mackie-Donnelly commented
It’s so hard to make a scale model or accurate blueprint. Something that tells me the measurements on the page is using. It may be a small thing for some but it’s very frustrating for others.
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Carlo Bernard commented
A set square and a compass would be even fantastic for this application!!!
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Anoniempje commented
Would be an awesome new feature! Missing this for my Smith Charts
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Gordon Anderson commented
Thanks for sharing. I found a lot of interesting information here. https://www.indigocard.org/
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Urs Esa commented
yes, please: *DISTANCES* and *ANGLES* [incl. hack]
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<-- my current workaround: i created a sticker collection and containing a triangle ruler (png with transparent background) from the web. it can be shifted, rotated and scaled and allows for manual measurements and construction
--> could/should be more advanced from within the app. a tool that allows snapping, entering parameters, etc., both for analysis and construction -
Cam commented
Please add a ruler, would be super useful for making scale drawings for my engineering notes, and lines at a specific angle. Thanks very much
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Anonymous commented
Please add a ruler, or even better a triangle ruler. It will be necessary for my students to draw engineering diagrams or force diagrams. We, currently, need to get back to analog paper drawings... this can´t be your intention.
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Matt commented
My hands are pretty shaky, a ruler would solve the issue of uneven straight lines immediately. Im shocked this hasn't been added already.
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JGK commented
We *need* the triangle ruler!
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Anonymous commented
Please add this feature! The shape recognition is incredibly useful but it is not capable of some of the features of a ruler. The ability to draw perfectly parallel lines, dashed lines, and to align different parts of a sketch are all only accomplished with a ruler over the automatic shape feature. Adding a protractor, compass, French curves, triangles, and all sorts of hand drafting tools would make this app absolutely fantastic!!!
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Anonymous commented
3-hole punch guides, I’d like to be able to print pages and store them in my binder.
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Vera Eppel-Weber commented
Ein richtiges Geodreieck wäre ein Traum!
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Les Roche commented
Yes a ruler, and an ability to measure distance between different points of a PDF.
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adenm commented
It’s been 6 years, why doesn’t it have this feature? And dotted line .it’s been 8years
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Jonathan Mayer commented
I'm still waiting! This would be great. Basically a must if I want to use this for engineering purposes. Would be nice if I could do this on my iPad.
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Alyssa Gatenby-Moore commented
Yes Please! and a protractor!
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Anonymous commented
Some more Math tools for example Triangle ruler (there is no app coming up with that), dotted lines, Circles with center,...
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Lindsay commented
this would be great to be able to write straight on paper without the grid. and for egr classes
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Inês Trigo commented
A ruler would be great for both engineers and dyslexic people!
Using a ruler under the text line you are reading helps keep the letters in place. -
Joao Agricio commented
Ruler for angle measures and improved scale sense. Please :)