76 lines
2.3 KiB
JavaScript
76 lines
2.3 KiB
JavaScript
import React, { Component } from 'react';
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import PropTypes from 'prop-types';
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import { getFormattedColor, getStrokeWidth, denormalizeCoord } from '../helpers';
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export default class EllipseDrawComponent extends Component {
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shouldComponentUpdate(nextProps) {
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const { version } = this.props;
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return version !== nextProps.version;
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}
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getCoordinates() {
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const { slideWidth, slideHeight, annotation } = this.props;
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const { points } = annotation;
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// x1 and y1 - coordinates of the ellipse's top left corner
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// x2 and y2 - coordinates of the ellipse's bottom right corner
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const x1 = points[0];
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const y1 = points[1];
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const x2 = points[2];
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const y2 = points[3];
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// rx - horizontal radius
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// ry - vertical radius
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// cx and cy - coordinates of the ellipse's center
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let rx = (x2 - x1) / 2;
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let ry = (y2 - y1) / 2;
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const cx = denormalizeCoord(rx + x1, slideWidth);
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const cy = denormalizeCoord(ry + y1, slideHeight);
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rx = denormalizeCoord(Math.abs(rx), slideWidth);
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ry = denormalizeCoord(Math.abs(ry), slideHeight);
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return {
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cx,
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cy,
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rx,
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ry,
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};
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}
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render() {
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const results = this.getCoordinates();
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const { annotation, slideWidth } = this.props;
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const {
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cx, cy, rx, ry,
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} = results;
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return (
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<ellipse
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cx={cx}
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cy={cy}
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rx={rx}
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ry={ry}
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fill="none"
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stroke={getFormattedColor(annotation.color)}
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strokeWidth={getStrokeWidth(annotation.thickness, slideWidth)}
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style={{ WebkitTapHighlightColor: 'rgba(0, 0, 0, 0)' }}
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/>
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);
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}
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}
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EllipseDrawComponent.propTypes = {
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// Defines a version of the shape, so that we know if we need to update the component or not
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version: PropTypes.number.isRequired,
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// Defines an annotation object, which contains all the basic info we need to draw an ellipse
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annotation: PropTypes.shape({
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points: PropTypes.arrayOf(PropTypes.number).isRequired,
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color: PropTypes.number.isRequired,
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thickness: PropTypes.number.isRequired,
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}).isRequired,
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// Defines the width of the slide (svg coordinate system), which needed in calculations
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slideWidth: PropTypes.number.isRequired,
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// Defines the height of the slide (svg coordinate system), which needed in calculations
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slideHeight: PropTypes.number.isRequired,
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};
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