How to draw a circle?

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Drawing
Nikolina
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Nikolina asked on 29 Apr 2021, 04:07 PM | edited on 29 Apr 2021, 04:08 PM

This is a very straightforward question, and I'm sure the answer is as well, but I can't seem to figure it out. I want to be able to draw a simple shape, in this case, a circle. Here is what I did:

RenderSurface.jsx

import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { Surface } from '@progress/kendo-drawing';

import drawCircle from './DrawCircle';

class RenderSurface extends React.Component {
  surface;
  componentDidMount() {
    drawCircle(this.createSurface());
  }
  createSurface = () => {
    const element = ReactDOM.findDOMNode(this);

    this.surface = Surface.create(element);

    return this.surface;
  }
  render() {
    return (<div id="surface" />);
  }
}

export default RenderSurface;

 

DrawCircle.jsx

import { geometry } from '@progress/kendo-drawing';
const { Circle } = geometry;


export default function drawCircle(surface) {
  const circle = new Circle([100, 100], 80, {
    stroke: { color: "red", width: 1 },
    color: "rgb(255, 0, 0)",
  });

  surface.draw(circle);
}

 

App.js

import '@progress/kendo-theme-default/dist/all.css';
import './App.scss';
import React from 'react';
import RenderSurface from './components/RenderSurface';

function App() {
  return (
    <div className="App">
      <RenderSurface/>
    </div>
  );
}

export default App;

When I run this, I get the following error:

TypeError: _node_map__WEBPACK_IMPORTED_MODULE_4__.default[srcElement.nodeType] is not a constructor

I though it might have to do with bad import, but whatever I tried, it's always this error. What am I doing wrong?

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Stefan
Telerik team
answered on 30 Apr 2021, 09:38 AM

Hello, Nikolina,

Thank you for the code.

There is a small difference in the syntax for the Circle:

    const geometry = new GeomCircle([ 100, 100 ], 40);
    const circle = new Circle(geometry, {
        stroke: { color: "red", width: 1 }
    });
This is an example:

https://stackblitz.com/edit/react-guo6jg?file=app/draw-scene.js

The correct syntax can be seen here:

https://www.telerik.com/kendo-react-ui/components/drawing/api/Circle/#toc-clip-1

We agree that the documentation on the drawing API can be improved as sometimes the correct approach is not straightforward.

Regards,
Stefan
Progress Telerik

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Nikolina
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commented on 30 Apr 2021, 02:46 PM

Hello, Stefan.

Thank you for clarifying this. Much appreciated!
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Nikolina
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Answers by
Stefan
Telerik team
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