Vladimir Barbarosh vbarbarosh

## svg_pattern_grid.svg

      
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                vbarbarosh
                / svg_pattern_grid.svg
            
            
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              June 9, 2019 17:39
            
              
                svg_pattern_grid – Drawing a 10x10 grid by 100x100 outline https://codescreens.com
              
          
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## svg_pattern_dots.svg

      
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                / svg_pattern_dots.svg
            
            
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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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## chartjs.html
<!-- Rendering charts with chart.js -->

<div style="position:absolute; top:0; left:0; width:100%; height:100%;">
    <canvas id="canvas" style="width:100%; height:100%;"></canvas>
</div>

<script src="https://unpkg.com/chart.js@2.8.0/dist/Chart.min.js"></script>
<script>
new Chart(document.getElementById('canvas').getContext('2d'), {
    type: 'line', // line|bar

## svg_coords.svg

      
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                vbarbarosh
                / svg_coords.svg
            
            
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              June 5, 2019 16:47
            
              
                svg_coords – Drawing a coordinate system https://codescreens.com
              
          
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## math_scale.html
<!-- Scale a point around origin -->
<!-- https://codepen.io/vbarbarosh/pen/OYrdxK -->

<svg>
    <circle id="orig" cx="200" cy="150" r="10" />
    <circle id="a" cx="25" cy="25" r="5" fill="#8f8" />
    <circle id="b" cx="150" cy="25" r="5" />
</svg>

<style>

## math_rotate.html
<!-- Rotate a point around origin -->
<!-- https://codepen.io/vbarbarosh/pen/joXEyR -->

<svg>
    <circle id="origin" cx="200" cy="150" r="10" />
    <circle id="point" cx="175" cy="125" r="5" />
</svg>

<style>
svg {

## node_promise_promisify.js
const Promise = require('bluebird');
const fs = require('fs');
const util = require('util');

// Ways to promisify a function
// $ node node_promise_promisify.js

// https://nodejs.org/api/util.html#util_util_promisify_original
const fs_open = util.promisify(fs.open);

## node_promise_then.js
const Promise = require('bluebird');

// How Promise.then is designed to work
// $ node node_promise_then.js

main().catch(panic);

async function main()
{
    // FULFILLED

## node_buffer.js
// How to work with Buffer

main().catch(panic);

async function main()
{
    // Use this if buffer will be immediately written to
    Buffer.allocUnsafe(1024);

    // Use this to allocate memory filled with zeroes

## app_fontmerge
#!/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

# Merge several .woff2 files into a single one. Primary use case is to
# feed resulted file to a svgtext app.
#
# https://github.com/fonttools/fonttools
	<!-- Rendering charts with chart.js -->

	<div style="position:absolute; top:0; left:0; width:100%; height:100%;">
	<canvas id="canvas" style="width:100%; height:100%;"></canvas>
	</div>

	<script src="https://unpkg.com/chart.js@2.8.0/dist/Chart.min.js"></script>
	<script>
	new Chart(document.getElementById('canvas').getContext('2d'), {
	type: 'line', // line\|bar
	<!-- Scale a point around origin -->
	<!-- https://codepen.io/vbarbarosh/pen/OYrdxK -->

	<svg>
	<circle id="orig" cx="200" cy="150" r="10" />
	<circle id="a" cx="25" cy="25" r="5" fill="#8f8" />
	<circle id="b" cx="150" cy="25" r="5" />
	</svg>

	<style>
	<!-- Rotate a point around origin -->
	<!-- https://codepen.io/vbarbarosh/pen/joXEyR -->

	<svg>
	<circle id="origin" cx="200" cy="150" r="10" />
	<circle id="point" cx="175" cy="125" r="5" />
	</svg>

	<style>
	svg {
	const Promise = require('bluebird');
	const fs = require('fs');
	const util = require('util');

	// Ways to promisify a function
	// $ node node_promise_promisify.js

	// https://nodejs.org/api/util.html#util_util_promisify_original
	const fs_open = util.promisify(fs.open);
	const Promise = require('bluebird');

	// How Promise.then is designed to work
	// $ node node_promise_then.js

	main().catch(panic);

	async function main()
	{
	// FULFILLED
	// How to work with Buffer

	main().catch(panic);

	async function main()
	{
	// Use this if buffer will be immediately written to
	Buffer.allocUnsafe(1024);

	// Use this to allocate memory filled with zeroes
	#!/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

	# Merge several .woff2 files into a single one. Primary use case is to
	# feed resulted file to a svgtext app.
	#
	# https://github.com/fonttools/fonttools