chroma.js | JavaScript library for all kinds of color manipulations | Frontend Utils library
kandi X-RAY | chroma.js Summary
kandi X-RAY | chroma.js Summary
Chroma.js is a ~~tiny~~ small-ish zero-dependency JavaScript library (13.5kB) for all kinds of color conversions and color scales.
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Top functions reviewed by kandi - BETA
- Keystrokes on a mouse event .
- Registers event handlers for mouse up events .
- Represents the CodeMirror display .
- Draw a Selection Range
- Update the visible area that will update the visible lines of the current display .
- Handle scroll events .
- Mark a text selection .
- Creates CodeMirror instance .
- Insert a span text into the appropriate spans .
- Makes a selection change event .
chroma.js Key Features
chroma.js Examples and Code Snippets
Community Discussions
Trending Discussions on chroma.js
QUESTION
I am trying to map out a geojson that I am fetching in react and using react-leaflet. I am able to map the geojson when I import it locally. Now I am fetching the raw data via https and then setting state to try to pass that state as props. But nothing maps from this.state.geojson.
I think I might be setting state wrong or misunderstanding how the rendering works. Some guidance would be appreciated. Below is some of the code:
App.js
...ANSWER
Answered 2020-Dec-20 at 19:10Change of state should occur inside then and not outside:
QUESTION
I have a design system with many, many colors. I have created a table of colors where all colors are mixed with every other color and color contrast ratio (CCR) of each combination is output. The goal is to flag inaccessible color combinations.
I am using Chroma.js to manipulate the colors and output the CCRs. It works brilliantly with the bulk of my HSL-defined colors.
The trouble comes when my design system uses a color with an alpha channel. Determining how a pair of colors performs with CCR when one or both of them are transparent is problematic. I am trying a few different things to mix or blend a HSLA color with white and then run the contrast function on that. Here is a snippet of what I am doing:
...ANSWER
Answered 2020-Dec-10 at 11:20I do not know how to do this with the library you mentioned (Chroma.js) but hopefully a vanilla JavaScript function will help.
Please note that the below function always assumes an opaque background colour to work correctly (hence background RGB and foreground RGBA).
If you need to work with 2 colours that both have alpha channels you would run the function on the background colour first (as the foreground colour) with a white background and then combine the two colours.
The function will also combine two RGB colours, simply omit the alpha channel when passing your RGB colour (convertToRGB({r,g,b}, {r,g,b}))
QUESTION
After updating to Angular 6.0.1, I get the following error on ng serve:
ANSWER
Answered 2018-May-16 at 05:12Install @angular-devkit/build-angular as dev dependency. This package is newly introduced in Angular 6.0
npm install --save-dev @angular-devkit/build-angular
or,
yarn add @angular-devkit/build-angular --dev
QUESTION
I am trying to follow along with this:
to be able to mix up to c0 the c1 must be less or equal to c0 on per channel bases. So for example random lesser color:
...
ANSWER
Answered 2019-Jun-12 at 11:21the easiest is to directly map an ordinal index to a color c1 ...
For all colors just use increment (like increment on bignum arithmetics where channel is a digit).
If yo want jut some of the colors then compute the sequenced modulo of each used channel usable values count ... something like this in C++/VCL:
QUESTION
So I generated random colors and blended them together using chroma.js.
It looks decent because the blending in chroma.js is amazing. However, notice there are two or 3 green spots (or more) in the image, and a few purple spots, etc. To make this look nicer, I was thinking it would be good to sort the colors before blending them, so they are more like the rainbow. Wondering if there is any way to do this or if it's possible somehow, I can't really imagine how to do this.
As far as I thought is this. For each color, calculate it's distance to one of the 6 rainbow colors. The closest to red goes first, then the closest to orange, etc. But I don't really see how to do that, seems complicated.
...ANSWER
Answered 2019-Jun-12 at 04:02Sorting by hue will give you the colors "like the rainbow". However, notice that while the rainbow colors are fully saturated ones, your set of colors vary in saturation and luminance too. Therefore ordering by hue may not produce the best looking result.
The problem of creating the smoothest palette out of the given set of colors is equivalent to the Traveling Salesman Problem. Of course a precise solution of that is not necessary, and any fast approximation might do.
QUESTION
ANSWER
Answered 2019-Mar-05 at 15:03You're setting fillColor to a list of colours. You need to pick out a specific colour based on the properties of feature.
This would work (based on one of the official Leaflet demos).
QUESTION
Anyone who frequently does UI likely knows that for a given color hsl(H, 100%, 50%) (syntax is CSS) not all values of H will produce a color suitable to be placed under arbitrarily black or white text. The specific fact I'm noting is that certain colors (green) appear especially bright and other (blue) appear especially dark.
Well suppose I would like a user to be able to enter a color hue and have the color always appear with a consistent brightness so that one of either white or black text is guaranteed to always be readable on top of it. I would like all colors to also maintain the most vivid level of saturation they can given the constraint on brightness.
Here is a quick example of what I've tried so far. I start with a grid of squared like this rendered using a bunch of html div elements. Essentially these are hue values roughly from 0 to 360 along the horizontal axis and lightness values from roughly 0% to 100% along the vertical axis. All saturation value are set to 100%.
Using a JS library library called chroma.js, I now process all colors using the color.luminance function, whose definition seems to be to do what I'm looking for. I just passed the lightness of the hsl value in as the parameter to the function. I don't know for sure that this is the best way to accomplish my goal though since I'm not familiar with all the terminology at play here. Please note that my choice to use this library is by no means a constraint on how I want to go about this. It just represents my attempt at solving the problem.
The colors certainly now have a more consistent lightness, but the spectrum now seems particularly vivid around the orange to cyan area and particularly dull everywhere else. Also the colors seems to drop very quickly away from black at the top.
Hopefully this example helps a bit to express what I'm trying to accomplish here. Does any know what they best way to go about this is?
...ANSWER
Answered 2019-Feb-27 at 17:37I found the solution! Check out HSLuv. It balances out all the hues in the spectrum so that at any given saturation and lightness, all hues will have the exact same perceived brightness to the human eye.
This solved my problem because now I can just set my text color to white (for example) and then as long as the text is readable against a certain HSLuv lightness it is guaranteed that it will be readable against any hue and saturation used in combination with that lightness. Magic.
QUESTION
I'm a newbie at JS and especially Typescript. I'm using npm 6.2.0 with typescript 3.0.1. I'm trying to import the "file-saver" module and use it. Its index.d.ts looks like this:
ANSWER
Answered 2018-Sep-15 at 20:37Try removing the external option from rollup.config.js. This option is telling Rollup that the file-saver module should be omitted from the bundle because it will be available in your target environment; in the browser, this is not the case.
QUESTION
I'm working through and trying to understand the source code of https://trianglify.io/ which can be found at https://github.com/qrohlf/trianglify. In the lib/trianglify.js file, I come across the following lines of code:
...ANSWER
Answered 2018-Mar-31 at 03:52chroma is part of chroma.js.
Looking at the code, chroma.scale(...) constructs a function with prototypes with fluent methods.
QUESTION
At this moment I just removed green background from https://s14.postimg.org/x9hmont5d/image.jpg with Seriously.js library.
...ANSWER
Answered 2018-Jan-22 at 19:01Looking at the SeriouslyJS library, the background image can be added using the blend-plugin. You need to include this next to the chroma script-tag:
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