Kineticjs is not performing up to par

Question

Kineticjs is not performing up to par

I apologize if this question has already been asked, but I haven't been able to locate it.

I am working on a project that involves a canvas displaying approximately 400-500 rectangles, each ranging in height and width from 20-30 pixels. The goal is to have each rectangle move one pixel to the left and up upon mouseover, and return to its original position on mouseout to create a selected effect. While my code functions well with a small number of shapes, it experiences significant slowdown when dealing with 500 of them. I came across an example online that suggested creating an "animation layer" to move the objects that need to be animated. However, this approach still requires redrawing the main layer to erase the previously moved item... Below is the code snippet:

 // Insert KineticJS code here

And this is the code responsible for rendering the canvas:

 // Insert HTML and script code for rendering the canvas here

I have a feeling that I am missing something crucial here, but my knowledge of KineticJS is limited. Could someone provide guidance on the correct approach?

Thank you in advance, Danny

javascript canvas kineticjs

Answer 1

Answer №1

If you haven't already, be sure to take a look at KineticJS v4.0.0. The event detection engine has been completely revamped to provide lightning-fast hit detection, even when dealing with a large number of shapes:

Answer 2

If you haven't already, be sure to take a look at KineticJS v4.0.0. The event detection engine has been completely revamped to provide lightning-fast hit detection, even when dealing with a large number of shapes:

Answer 3

Answer №2

This challenge turned out to be quite interesting. Initially, I believed the issue lied within the shape events, but the enhancements made there were minimal.

In KineticJS, the events are applied to specific on-screen shapes by searching through the coordinates of the models until a match is found with the current mouse coordinates. By having only one layer, we increase the size of the array to search, which can be inefficient.

The solution was to implement multiple layers. I introduced a layer for each row in order to optimize the search process.

Some of the key changes made in the code are:

Avoid moving shapes between layers to prevent array splicing and index shifting.
Utilize the relative move(x,y) method over the setX() and setY() methods for small shifts.
The animation layer concept described in tutorials is meant for actual animations on timed intervals; what we are doing here is just a normal shape movement on an event trigger.
Implemented a minor JavaScript enhancement; when returning an object to conceal private data and methods, refrain from using new to create an object.

Check out the code snippet below for the implementation:

<script>
    $(function () {
        // Code implementation here
    });
</script>

Another portion of the code:

More code implementation here

Answer 4

This challenge turned out to be quite interesting. Initially, I believed the issue lied within the shape events, but the enhancements made there were minimal.

In KineticJS, the events are applied to specific on-screen shapes by searching through the coordinates of the models until a match is found with the current mouse coordinates. By having only one layer, we increase the size of the array to search, which can be inefficient.

The solution was to implement multiple layers. I introduced a layer for each row in order to optimize the search process.

Some of the key changes made in the code are:

Avoid moving shapes between layers to prevent array splicing and index shifting.
Utilize the relative move(x,y) method over the setX() and setY() methods for small shifts.
The animation layer concept described in tutorials is meant for actual animations on timed intervals; what we are doing here is just a normal shape movement on an event trigger.
Implemented a minor JavaScript enhancement; when returning an object to conceal private data and methods, refrain from using new to create an object.

Check out the code snippet below for the implementation:

<script>
    $(function () {
        // Code implementation here
    });
</script>

Another portion of the code:

More code implementation here

Answer 5

Answer №3

Creating 500 shapes can have that impact. The speed of your computer and the browser you use (Chrome is currently the quickest) will also play a role in performance, although you'll want satisfactory performance on all browsers.

For more information on performance and tips for enhancing it, visit this link.

Answer 6

Creating 500 shapes can have that impact. The speed of your computer and the browser you use (Chrome is currently the quickest) will also play a role in performance, although you'll want satisfactory performance on all browsers.

For more information on performance and tips for enhancing it, visit this link.

Kineticjs is not performing up to par

Answer №1

Answer №2

Answer №3

Similar questions

In Node.js, use the `[]` operator to select elements from an array of strings without including

In JavaScript, an HTTP request file includes a JavaScript variable

Interactive bar chart that updates in real-time using a combination of javascript, html, and

Stop Code Execution || Lock Screen

Transforming varied JavaScript objects into a serial form

What is the method for obtaining a date in the format of 2018-05-23T23:00:00.000+00:00?

Displaying subtotal in a list using Vue.js and conditional rendering with v-if statement

Click on the button to be directed to a different page using React

Experimenting with d3 using Node.js, JSDOM, and Jasmine

Node.js: How to handle spaces when running a UNIX command

Is it possible to modify a portion of the zod schema object according to the value of a

Unable to run JavaScript file fetched from cache API

Developing a new class within a function

"Patience is key when it comes to waiting for components to render

A guide on dynamically checking the checkbox values in each row of a table using JavaScript or jQuery

Tips for concealing labels until the submit button is activated

Using incorrect string as JavaScript argument

What is the best way to merge angularjs modules?

What is the best way to include multiple action creators in a single listenerMiddleware in Redux Toolkit?

Encountered an error in React JS and Axios when attempting to select a form: "Failed to construct 'FormData': parameter 1 is not of type 'HTMLFormElement'."