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Backend API
import React, { useCallback, useState } from 'react';
import { BarGauge, Label } from 'devextreme-react/bar-gauge';
import { SelectBox } from 'devextreme-react/select-box';
import { colors, colorLabel } from './data.ts';
const palette = ['#ff0000', '#00ff00', '#0000ff'];
function getBasicColors(value: string | any[]) {
const code = Number(`0x${value.slice(1)}`);
return [
(code >> 16) & 0xff,
(code >> 8) & 0xff,
code & 0xff,
];
}
function App() {
const [basis, setBasis] = useState(getBasicColors(colors[0].code));
const [currentColor, setCurrentColor] = useState(colors[0].code);
const onSelectionChanged = useCallback(({ selectedItem: { code } }) => {
setCurrentColor(code);
setBasis(getBasicColors(code));
}, [setCurrentColor, setBasis]);
return (
<div>
<div className="long-title">
<h3>Colors Representation via Basic Colors</h3>
</div>
<div id="gauge-demo">
<BarGauge
id="gauge"
startValue={0}
endValue={255}
palette={palette}
values={basis}
>
<Label visible={false} />
</BarGauge>
<div className="action-container">
<SelectBox
id="select-color"
width={150}
inputAttr={colorLabel}
dataSource={colors}
value={currentColor}
displayExpr="name"
valueExpr="code"
onSelectionChanged={onSelectionChanged}
/>
<div className="color-box" style={{ backgroundColor: currentColor }}></div>
</div>
</div>
</div>
);
}
export default App;
import React, { useCallback, useState } from 'react';
import { BarGauge, Label } from 'devextreme-react/bar-gauge';
import { SelectBox } from 'devextreme-react/select-box';
import { colors, colorLabel } from './data.js';
const palette = ['#ff0000', '#00ff00', '#0000ff'];
function getBasicColors(value) {
const code = Number(`0x${value.slice(1)}`);
return [(code >> 16) & 0xff, (code >> 8) & 0xff, code & 0xff];
}
function App() {
const [basis, setBasis] = useState(getBasicColors(colors[0].code));
const [currentColor, setCurrentColor] = useState(colors[0].code);
const onSelectionChanged = useCallback(
({ selectedItem: { code } }) => {
setCurrentColor(code);
setBasis(getBasicColors(code));
},
[setCurrentColor, setBasis],
);
return (
<div>
<div className="long-title">
<h3>Colors Representation via Basic Colors</h3>
</div>
<div id="gauge-demo">
<BarGauge
id="gauge"
startValue={0}
endValue={255}
palette={palette}
values={basis}
>
<Label visible={false} />
</BarGauge>
<div className="action-container">
<SelectBox
id="select-color"
width={150}
inputAttr={colorLabel}
dataSource={colors}
value={currentColor}
displayExpr="name"
valueExpr="code"
onSelectionChanged={onSelectionChanged}
/>
<div
className="color-box"
style={{ backgroundColor: currentColor }}
></div>
</div>
</div>
</div>
);
}
export default App;
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.tsx';
ReactDOM.render(
<App />,
document.getElementById('app'),
);
export const colors = [{
name: 'Amaranth',
code: '#e52b50',
}, {
name: 'Amethyst',
code: '#9966cc',
}, {
name: 'Ash grey',
code: '#b2beb5',
}, {
name: 'Barn red',
code: '#7c0a02',
}, {
name: 'Imperial',
code: '#602f6b',
}, {
name: 'Lemon lime',
code: '#e3ff00',
}, {
name: 'Mountain Meadow',
code: '#30ba8f',
}, {
name: 'Outer Space',
code: '#414a4c',
}, {
name: 'Persian plum',
code: '#701c1c',
}, {
name: 'Seal brown',
code: '#321414',
}, {
name: 'Twilight lavender',
code: '#8a496b',
}, {
name: 'Umber',
code: '#635147',
}];
export const colorLabel = { 'aria-label': 'Color' };
window.exports = window.exports || {};
window.config = {
transpiler: 'ts',
typescriptOptions: {
module: 'system',
emitDecoratorMetadata: true,
experimentalDecorators: true,
jsx: 'react',
},
meta: {
'react': {
'esModule': true,
},
'typescript': {
'exports': 'ts',
},
'devextreme/time_zone_utils.js': {
'esModule': true,
},
'devextreme/localization.js': {
'esModule': true,
},
'devextreme/viz/palette.js': {
'esModule': true,
},
},
paths: {
'npm:': 'https://unpkg.com/',
},
defaultExtension: 'js',
map: {
'ts': 'npm:plugin-typescript@4.2.4/lib/plugin.js',
'typescript': 'npm:typescript@4.2.4/lib/typescript.js',
'react': 'npm:react@17.0.2/umd/react.development.js',
'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js',
'prop-types': 'npm:prop-types@15.8.1/prop-types.js',
'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.28.1/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@24.1.5/cjs',
'devextreme-react': 'npm:devextreme-react@24.1.5/cjs',
'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.2.10/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@4.1.56/dist/dx-gantt.js',
'@devextreme/runtime': 'npm:@devextreme/runtime@3.0.13',
'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js',
'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',
'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js',
'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',
'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js',
'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',
'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',
'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',
'devextreme-cldr-data': 'npm:devextreme-cldr-data@1.0.3',
// SystemJS plugins
'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js',
'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js',
// Prettier
'prettier/standalone': 'npm:prettier@2.8.8/standalone.js',
'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js',
},
packages: {
'devextreme': {
defaultExtension: 'js',
},
'devextreme-react': {
main: 'index.js',
},
'devextreme/events/utils': {
main: 'index',
},
'devextreme/localization/messages': {
format: 'json',
defaultExtension: 'json',
},
'devextreme/events': {
main: 'index',
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js',
},
},
packageConfigPaths: [
'npm:@devextreme/*/package.json',
'npm:@devextreme/runtime@3.0.13/inferno/package.json',
],
babelOptions: {
sourceMaps: false,
stage0: true,
react: true,
},
};
System.config(window.config);
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(<App />, document.getElementById('app'));
export const colors = [
{
name: 'Amaranth',
code: '#e52b50',
},
{
name: 'Amethyst',
code: '#9966cc',
},
{
name: 'Ash grey',
code: '#b2beb5',
},
{
name: 'Barn red',
code: '#7c0a02',
},
{
name: 'Imperial',
code: '#602f6b',
},
{
name: 'Lemon lime',
code: '#e3ff00',
},
{
name: 'Mountain Meadow',
code: '#30ba8f',
},
{
name: 'Outer Space',
code: '#414a4c',
},
{
name: 'Persian plum',
code: '#701c1c',
},
{
name: 'Seal brown',
code: '#321414',
},
{
name: 'Twilight lavender',
code: '#8a496b',
},
{
name: 'Umber',
code: '#635147',
},
];
export const colorLabel = { 'aria-label': 'Color' };
<!DOCTYPE html>
<html lang="en">
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" />
<link rel="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/24.1.5/css/dx.light.css" />
<link rel="stylesheet" type="text/css" href="styles.css" />
<script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script type="text/javascript" src="config.js"></script>
<script type="text/javascript">
System.import("./index.tsx");
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="app"></div>
</div>
</body>
</html>
#gauge-demo {
height: 440px;
width: 100%;
}
#gauge {
width: 80%;
height: 100%;
margin-top: 20px;
float: left;
}
.action-container {
width: 20%;
text-align: left;
margin-top: 20px;
float: left;
}
.color-box {
width: 40px;
height: 40px;
margin-top: 20px;
}
.long-title h3 {
font-weight: 200;
font-size: 28px;
text-align: center;
margin-bottom: 20px;
}