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"The program should, in some way, expand the concept of what computer paint programs are, as well as what mark making can be."

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Omar Rizwan @omar

woah -- it's like it's an intermingling of levels of abstraction (the world of display and pixels vs. the world of characters and text)

Function: pixel-fill-region start end pixel-width ¶
Most Emacs buffers use monospaced text, so all the filling functions (like fill-region) work based on the number of characters and char-width. However, Emacs can render other types of things, like text that contains images and using proportional fonts, and the pixel-fill-region exists to handle that. It fills the region of text between start and end at pixel granularity, so text using variable-pitch fonts or several different fonts looks filled regardless of different character sizes. The argument pixel-width specifies the maximum pixel width a line is allowed to have after filling; it is the pixel-resolution equivalent of the fill-column in fill-region. For instance, this Lisp snippet will insert text using a proportional font, and then fill this to be no wider than 300 pixels:

(insert (propertize
"This is a sentence that's ends here."
'face 'variable-pitch))
(pixel-fill-region (point) (point-max) 300)

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Omar Rizwan @omar

There is only one 100% foolproof way:

public static double normalizeAngle(double angle) {
return Math.atan2(Math.sin(angle), Math.cos(angle));
}
Everything else is people trying to be too smart and failing.
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answered Mar 25, 2016 at 15:09
cohadar's user avatar
cohadar
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This method is probably more accurate (and I think provides a half-closed range, unlike MathUtils), but it's also about 40x slower (median ~190ns on my 15" MBP, vs. ~4.9ns using MathUtils), which may be more important for some applications. –
David Moles
Mar 28, 2016 at 17:24

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Omar Rizwan @omar

thinking about various 3d objects having a dry-erase surface that you can draw on https://www.sargentwelch.com/store/product/28306847/whiteboard-globe

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Omar Rizwan @omar

weirdly beautiful

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Omar Rizwan @omar

all the best software is just a material

it's often very tempting to add some capability to a
system that also breaks some symmetry or assumption or
monism, and so loses far more than the capability adds.
solo authors are less susceptible to the temptation;
companies are much more susceptible

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Omar Rizwan @omar

oo https://old.reddit.com/r/MapPorn/comments/10o3u0c/political_world_map_de_facto_labeled_january_2023/

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Omar Rizwan @omar

https://www.complang.tuwien.ac.at/ulrich/PS/transforms.html interesting difference from HTML5 canvas (which otherwise has an almost identical API to PostScript) where you can set the matrix directly

Transformations

The PostScript interpreter keeps track of a matrix called the current transformation matrix. When constructing an image, the interpreter uses this matrix to convert the world coordinates used by the program into device coordinates used by the printer itself. Generally, the actual contents of the matrix are of little interest to a well-written PostScript program; the reason for this is that the specific contents are device-dependent. A program that uses them might not work properly. PostScript does provide a number of operators, however, that transform the matrix in a device-independent way. These operators allow you to transform the way user space maps onto device space, and they modify the current transformation matrix with a simple matrix transformation. The basic transformation operators are:
rotate
translate
scale
It is useful to realize that the current transformation matrix (and, hence the effect of all these operators) is part of the current graphics state and can be saved and restored using the gsave, and grestore operators. In addition, the transformations on the matrix affect path components constructed after the transformation. Even if a path is only partially constructed when a transformation is invoked, the parts of the path that were in place before the transformation will be unaffected.

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Omar Rizwan @omar

i don't think we're optimized for non-computer
interest yet but ppl still tend to be interested

like the system is much more high ceiling than low
floor despite how it looks / what people think

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Omar Rizwan @omar

there's a weird specific skill of looking at a bunch of papers and distilling them to 'this one proposes the actually useful technique in practice; all these others are later variations by other people that perform better on benchmarks but aren't really practical'

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Omar Rizwan @omar

mulling whether to test Nvidia support by trying to set up Google Cloud Compute Engine workstation vs. trying to dig up my Jetson Nano and plug it into a spare display

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