61 lines
1.8 KiB
JavaScript
Executable File
61 lines
1.8 KiB
JavaScript
Executable File
import React, { Component } from 'react';
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import PropTypes from 'prop-types';
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import AnnotationHelpers from '../helpers';
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export default class LineDrawComponent extends Component {
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shouldComponentUpdate(nextProps) {
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return this.props.version !== nextProps.version;
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}
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getCoordinates() {
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const { slideWidth, slideHeight } = this.props;
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const { points } = this.props.annotation;
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const x1 = (points[0] / 100) * slideWidth;
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const y1 = (points[1] / 100) * slideHeight;
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const x2 = (points[2] / 100) * slideWidth;
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const y2 = (points[3] / 100) * slideHeight;
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return {
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x1,
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y1,
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x2,
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y2,
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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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return (
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<line
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x1={results.x1}
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y1={results.y1}
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x2={results.x2}
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y2={results.y2}
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stroke={AnnotationHelpers.formatColor(annotation.color)}
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strokeLinejoin="round"
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strokeWidth={AnnotationHelpers.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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LineDrawComponent.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 a line
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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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