zrender is a lightweight canvas library that provides a powerful and flexible way to create and manipulate 2D graphics. It is often used as a rendering engine for the ECharts library, but it can also be used independently for custom graphics and animations.

What are zrender's main functionalities?

Basic Shapes

This feature allows you to create basic shapes like circles, rectangles, and lines. The code sample demonstrates how to create a red circle and add it to the canvas.

const zrender = require('zrender');
const zr = zrender.init(document.getElementById('main'));
const circle = new zrender.Circle({
  shape: {
    cx: 150,
    cy: 150,
    r: 50
  },
  style: {
    fill: 'red'
  }
});
zr.add(circle);

Animations

This feature allows you to animate shapes. The code sample demonstrates how to animate a rectangle moving from one position to another over a duration of 1000 milliseconds.

const zrender = require('zrender');
const zr = zrender.init(document.getElementById('main'));
const rect = new zrender.Rect({
  shape: {
    x: 50,
    y: 50,
    width: 100,
    height: 100
  },
  style: {
    fill: 'blue'
  }
});
zr.add(rect);
rect.animate('shape', true)
  .when(1000, { x: 200 })
  .start();

Event Handling

This feature allows you to handle events like click, mouseover, and mouseout on shapes. The code sample demonstrates how to add a click event listener to a circle that shows an alert when the circle is clicked.

const zrender = require('zrender');
const zr = zrender.init(document.getElementById('main'));
const circle = new zrender.Circle({
  shape: {
    cx: 150,
    cy: 150,
    r: 50
  },
  style: {
    fill: 'green'
  }
});
zr.add(circle);
circle.on('click', function () {
  alert('Circle clicked!');
});

Other packages similar to zrender

Readme

Source

ZRender

A lightweight graphic library which provides 2d draw for Apache ECharts.

Commits Since 4.0.0

Documentation

https://ecomfe.github.io/zrender-doc/public/

License

BSD 3-Clause License

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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Last updated on 23 Jan 2022

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