65 lines
2.3 KiB
JavaScript
Executable File
65 lines
2.3 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 TriangleDrawComponent 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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// points[0] and points[1] are x and y coordinates of the top left corner of the annotation
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// points[2] and points[3] are x and y coordinates of the bottom right corner of the annotation
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const xBottomLeft = points[0];
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const yBottomLeft = points[3];
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const xBottomRight = points[2];
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const yBottomRight = points[3];
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const xTop = ((xBottomRight - xBottomLeft) / 2) + xBottomLeft;
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const yTop = points[1];
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const path = `M${(xTop / 100) * slideWidth
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},${(yTop / 100) * slideHeight
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},${(xBottomLeft / 100) * slideWidth
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},${(yBottomLeft / 100) * slideHeight
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},${(xBottomRight / 100) * slideWidth
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},${(yBottomRight / 100) * slideHeight
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}Z`;
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return path;
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}
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render() {
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const path = this.getCoordinates();
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const { annotation, slideWidth } = this.props;
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return (
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<path
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style={{ WebkitTapHighlightColor: 'rgba(0, 0, 0, 0)' }}
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fill="none"
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stroke={AnnotationHelpers.getFormattedColor(annotation.color)}
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d={path}
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strokeWidth={AnnotationHelpers.getStrokeWidth(annotation.thickness, slideWidth)}
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strokeLinejoin="miter"
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/>
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);
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}
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}
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TriangleDrawComponent.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 triangle
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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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