Vladimir Barbarosh vbarbarosh

## svg_pattern_dots.svg

      
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                vbarbarosh
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              December 8, 2020 22:40
            
              
                svg_pattern_dots – Drawing dots on each 5th pixel https://codescreens.com
              
          
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## shell_lines_prefix_time
#!/bin/bash

# http://www.gnu.org/software/bash/manual/bash.html#The-Set-Builtin
# http://redsymbol.net/articles/unofficial-bash-strict-mode/
set -o nounset -o errexit -o pipefail

# Add a timestamp to beginning of each line

# The fastest
# https://unix.stackexchange.com/a/26797/121657

## js_html_escape.js
// Make a string safe to put into html
// https://stackoverflow.com/a/6234804/1478566
//
// Consider using https://github.com/mathiasbynens/he for production
function html_escape(s)
{
    return s
        .replace(/&/g, '&amp;')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;')

## node_csv_write.js
const {createObjectCsvWriter} = require('csv-writer');

// Create csv files from arrays

main().catch(panic);

// https://stackabuse.com/reading-and-writing-csv-files-with-node-js/
async function main()
{
    const rows = [

## shell_lines_common
#!/bin/bash

# http://www.gnu.org/software/bash/manual/bash.html#The-Set-Builtin
# http://redsymbol.net/articles/unofficial-bash-strict-mode/
set -o nounset -o errexit -o pipefail

# Show common lines in two files

# https://unix.stackexchange.com/a/398143/121657
# > Use comm -12 file1 file2 to get common lines in both files.

## node_csv_parse.js
const csv = require('neat-csv');
const fs = require('fs');
const path = require('path');

// Parsing csv files and strings

main().catch(panic);

// https://stackabuse.com/reading-and-writing-csv-files-with-node-js/
async function main()

## math_line_intersection.html
<!-- Calculating the point of intersection of two lines -->
<svg id="app" xmlns="http://www.w3.org/2000/svg">
    <line :x1="x1" :y1="y1" :x2="x2" :y2="y2" stroke="black" />
    <line :x1="x3" :y1="y3" :x2="x4" :y2="y4" stroke="black" />
    <circle :cx="c.x" :cy="c.y" r="3" fill="red" />
</svg>

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.6.10/vue.min.js"></script>
<script>
// https://stackoverflow.com/a/38977789/1478566

## css_keyframes_values_at.html
<div id="app">
    Get property values from keyframes at specific time.
    <br>
    <textarea v-model="keyframes" cols="50" rows="5"></textarea>
    <br>
    <input v-model="time" type="number" min="0" max="1" step="0.01">
    <pre>{{ values }}</pre>
</div>

<script src="https://unpkg.com/vue@2.6.10/dist/vue.js"></script>

## css_pretty_format
#!/bin/bash

# http://www.gnu.org/software/bash/manual/bash.html#The-Set-Builtin
# http://redsymbol.net/articles/unofficial-bash-strict-mode/
set -o nounset -o errexit -o pipefail

# How to pretty print css
#
# usage
# $ cat a.css | ./css_pretty_format > out.css

## css_autoprefixer_clean
#!/bin/bash

# http://www.gnu.org/software/bash/manual/bash.html#The-Set-Builtin
# http://redsymbol.net/articles/unofficial-bash-strict-mode/
set -o nounset -o errexit -o pipefail

# Remove prefixes from css
#
# usage
# $ cat a.css | ./css_autoprefixer_clean > out.css
	#!/bin/bash

	# http://www.gnu.org/software/bash/manual/bash.html#The-Set-Builtin
	# http://redsymbol.net/articles/unofficial-bash-strict-mode/
	set -o nounset -o errexit -o pipefail

	# Add a timestamp to beginning of each line

	# The fastest
	# https://unix.stackexchange.com/a/26797/121657
	// Make a string safe to put into html
	// https://stackoverflow.com/a/6234804/1478566
	//
	// Consider using https://github.com/mathiasbynens/he for production
	function html_escape(s)
	{
	return s
	.replace(/&/g, '&')
	.replace(/</g, '<')
	.replace(/>/g, '>')
	const {createObjectCsvWriter} = require('csv-writer');

	// Create csv files from arrays

	main().catch(panic);

	// https://stackabuse.com/reading-and-writing-csv-files-with-node-js/
	async function main()
	{
	const rows = [
	const csv = require('neat-csv');
	const fs = require('fs');
	const path = require('path');

	// Parsing csv files and strings

	main().catch(panic);

	// https://stackabuse.com/reading-and-writing-csv-files-with-node-js/
	async function main()
	<!-- Calculating the point of intersection of two lines -->
	<svg id="app" xmlns="http://www.w3.org/2000/svg">
	<line :x1="x1" :y1="y1" :x2="x2" :y2="y2" stroke="black" />
	<line :x1="x3" :y1="y3" :x2="x4" :y2="y4" stroke="black" />
	<circle :cx="c.x" :cy="c.y" r="3" fill="red" />
	</svg>

	<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.6.10/vue.min.js"></script>
	<script>
	// https://stackoverflow.com/a/38977789/1478566
	<div id="app">
	Get property values from keyframes at specific time.
	<br>
	<textarea v-model="keyframes" cols="50" rows="5"></textarea>
	<br>
	<input v-model="time" type="number" min="0" max="1" step="0.01">
	<pre>{{ values }}</pre>
	</div>

	<script src="https://unpkg.com/vue@2.6.10/dist/vue.js"></script>