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Add "recolor:#ff00ff" custom CSS syntax to curly divs/spans

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This commit is contained in:
Trevor Buckner
2022-01-29 21:18:05 -05:00
parent 050bc472d0
commit 6a89f3f702
2 changed files with 73 additions and 1 deletions
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2
server.js
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@@ -1,6 +1,8 @@
const DB = require('./server/db.js');
const server = require('./server/app.js');
process.chdir(__dirname);
const config = require('nconf')
.argv()
.env({ lowerCase: true })

72
shared/naturalcrit/markdown.js
View File

@@ -329,6 +329,66 @@ const voidTags = new Set([
'input', 'keygen', 'link', 'meta', 'param', 'source'
]);
const recolor = (target)=>{
//First, extract the RGB components of the hex color notation.
var r = parseInt(target.substr(1,2), 16); // Grab the hex representation of red (chars 1-2) and convert to decimal (base 10).
var g = parseInt(target.substr(3,2), 16);
var b = parseInt(target.substr(5,2), 16);
r /= 255, g /= 255, b /= 255;
var max = Math.max(r, g, b), min = Math.min(r, g, b);
var h, s, l = (max + min) / 2;
if(max == min){
h = s = 0; // achromatic
}else{
var d = max - min;
s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
switch(max){
case r: h = (g - b) / d + (g < b ? 6 : 0); break;
case g: h = (b - r) / d + 2; break;
case b: h = (r - g) / d + 4; break;
}
h /= 6;
}
// fake hue-rotate to see how much to post-brighten and saturate
let angle = h * 2 * Math.PI;
console.log({angle: angle});
let sin = Math.sin(angle);
let cos = Math.cos(angle);
let matrix = [
0.213 + cos * 0.787 - sin * 0.213, 0.715 - cos * 0.715 - sin * 0.715, 0.072 - cos * 0.072 + sin * 0.928,
0.213 - cos * 0.213 + sin * 0.143, 0.715 + cos * 0.285 + sin * 0.140, 0.072 - cos * 0.072 - sin * 0.283,
0.213 - cos * 0.213 - sin * 0.787, 0.715 - cos * 0.715 + sin * 0.715, 0.072 + cos * 0.928 + sin * 0.072
];
r = Math.max(Math.min(1 * matrix[0] + 0 * matrix[1] + 0 * matrix[2], 255), 0);
g = Math.max(Math.min(1 * matrix[3] + 0 * matrix[4] + 0 * matrix[5], 255), 0);
b = Math.max(Math.min(1 * matrix[6] + 0 * matrix[7] + 0 * matrix[8], 255), 0);
//=========--------------------------------============
max = Math.max(r, g, b), min = Math.min(r, g, b);
let newL= (max + min) / 2;
console.log({newR : r, newG : g, newB: b});
console.log({newL :newL});
console.log({l : l})
l = l * 2; //Set lightness range from 0 to 200%, with 100% = no change (since we start with pure red which is .5 lightness)
//Set saturation range from 0 to 100%, with 100% = no change (since pure red is 1 saturation)
console.log({s:s});
console.log({l:l});
let contrast = 1;
if(l > 1)
contrast = (2-l)/(l);
return `filter:hue-rotate(${h}turn) contrast(${contrast}) brightness(${l}) saturate(${s});`; // Add at end
}
const processStyleTags = (string)=>{
//split tags up. quotes can only occur right after colons.
//TODO: can we simplify to just split on commas?
@@ -338,7 +398,17 @@ const processStyleTags = (string)=>{
const id = _.remove(tags, (tag)=>tag.startsWith('#')).map((tag)=>tag.slice(1))[0];
const classes = _.remove(tags, (tag)=>!tag.includes(':'));
const styles = tags.map((tag)=>tag.replace(/:"?([^"]*)"?/g, ':$1;'));
const styles = tags.map((tag)=>{
let newTag = tag.replace(/:"?([^"]*)"?/g, ':$1;');
let match;
if(match = newTag.match(/recolor:(#.{6})/)) {
console.log(match[1]);
newTag = recolor(match[1]);
}
return newTag;
});
return `${classes.join(' ')}" ${id ? `id="${id}"` : ''} ${styles.length ? `style="${styles.join(' ')}"` : ''}`;
};