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| import _ from 'lodash';
import React from 'react';
import { lucidClassNames } from '../../util/style-helpers';
import { discreteTicks } from '../../util/chart-helpers';
import { createClass, omitProps } from '../../util/component-types';
const cx = lucidClassNames.bind('&-Axis');
const {
string,
array,
func,
number,
oneOf,
} = React.PropTypes;
/**
* {"categories": ["visualizations", "chart primitives"]}
*
* *For use within an `svg`*
*
* Axes are used to help render human-readable reference marks on charts. They
* can either be horizontal or vertical and really only need a scale to be able
* to draw properly.
*
* This component is a very close sister to d3's svg axis and most of the logic
* was ported from there.
*/
const Axis = createClass({
displayName: 'Axis',
propTypes: {
/**
* Appended to the component-specific class names set on the root element.
*/
className: string,
/**
* Must be a d3 scale. Lucid exposes the `lucid.d3Scale` library for use
* here.
*/
scale: func.isRequired,
/**
* Size of the ticks for each discrete tick mark.
*/
innerTickSize: number,
/**
* Size of the tick marks found at the beginning and end of the axis. It's
* common to set this to `0` to remove them.
*/
outerTickSize: number,
/**
* An optional function that can format ticks. Generally this shouldn't be
* needed since d3 has very good default formatters for most data.
*
* Signature: `(tick) => {}`
*/
tickFormat: func,
/**
* If you need fine grained control over the axis ticks, you can pass them
* in this array.
*/
ticks: array,
/**
* Determines the spacing between each tick and its text.
*/
tickPadding: number,
/**
* Determines the orientation of the ticks. `left` and `right` will
* generate a vertical axis, whereas `top` and `bottom` will generate a
* horizontal axis.
*/
orient: oneOf(['top', 'bottom', 'left', 'right']),
/**
* Control the number of ticks displayed.
*
* If the scale is time based or linear, this number acts a "hint" per the
* default behavior of D3. If it's an ordinal scale, this number is treated
* as an absolute number of ticks to display and is powered by our own
* utility function `discreteTicks`.
*/
tickCount: number,
},
getDefaultProps() {
return {
innerTickSize: 6, // same as d3
outerTickSize: 6, // same as d3
tickPadding: 3, // same as d3
orient: 'bottom',
tickCount: null,
};
},
render() {
const {
scale,
className,
orient,
tickCount,
ticks = scale.ticks
? scale.ticks(tickCount)
: discreteTicks(scale.domain(), tickCount), // ordinal scales don't have `ticks` but they do have `domains`
innerTickSize,
outerTickSize,
tickFormat = scale.tickFormat ? scale.tickFormat() : _.identity,
tickPadding,
...passThroughs,
} = this.props;
const tickSpacing = Math.max(innerTickSize, 0) + tickPadding;
// Domain
const range = scale.range();
const sign = orient === 'top' || orient === 'left' ? -1 : 1;
const isH = orient === 'top' || orient === 'bottom'; // is horizontal
let scaleNormalized = scale;
// Only band scales have `bandwidth`, this conditional helps center the
// ticks on the bands
if (scale.bandwidth) {
const bandModifier = scale.bandwidth() / 2;
scaleNormalized = (d) => scale(d) + bandModifier;
}
return (
<g
{...omitProps(passThroughs, Axis)}
className={cx(className, '&')}
>
{isH ? (
<path
className={cx('&-domain')}
d={`M${range[0]},${sign * outerTickSize}V0H${range[1]}V${sign * outerTickSize}`}
/>
) : (
<path
className={cx('&-domain')}
d={`M${sign * outerTickSize},${range[0]}H0V${range[1]}H${sign * outerTickSize}`}
/>
)}
{_.map(ticks, (tick) =>
<g
key={tick}
transform={`translate(${isH ? scaleNormalized(tick) : 0}, ${isH ? 0 : scaleNormalized(tick)})`}
>
<line
className={cx('&-tick')}
x2={isH ? 0 : sign * innerTickSize}
y2={isH ? sign * innerTickSize : 0}
/>
<text
className={cx('&-tick-text')}
x={isH ? 0 : sign * tickSpacing}
y={isH ? sign * tickSpacing : 0}
dy={isH
? sign < 0 ? '0em' : '.71em' // magic d3 number
: '.32em' // magic d3 number
}
style={{
textAnchor: isH
? 'middle'
: sign < 0 ? 'end' : 'start',
}}
>
{tickFormat(tick)}
</text>
</g>
)}
</g>
);
},
});
export default Axis;
|