How to achieve 360-degree panoramic display effect with native javascript

360-degree panoramic display has become an indispensable function in modern web design. This display method can capture the panoramic scene and transform it into an interactive display effect on the web page, allowing users to Use your mouse or finger to rotate the perspective and gradually understand the entire scene. In this article, we will share a 360-degree panoramic display effect implemented in native JavaScript to provide our readers with practical technical reference.

Before we start, we need to define the requirements of the project. We need a component that can load panoramic images and allow users to rotate the scene by dragging or scrolling. At the same time, in order to improve the user experience, we need the scrolling process to be smooth instead of stiff. We also need to supplement it with some simple animation effects to allow users to better understand the scene.

First, we need a container that can load images. The implementation in HTML is as follows:

<div></div>

Next, we need to prepare a panoramic image, then divide it into 16 small images and number them , as shown in the figure below:

After segmentation, a total of 16 small pictures are obtained. These small pictures are arranged as follows:

1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16

Next, we need to create a The main function panorama(), in this function, we will use native JavaScript to implement the panoramic display function.

function panorama(){
  var container = document.getElementById('container');
  var images = [];
  var _prevX = 0;
  var _prevY = 0;
  var _offsetX = 0;
  var _offsetY = 0;
  var _dragging = false;
  var _sensitivity = 0.01;
  var _direction = 1;
  var _directionSpeed = 0;

  for(var i=1; i 3000) _direction = -1;
  }, 30);
}

In this function, we used 16 Image objects to load 16 small pictures respectively, and then added some event listening functions to realize the functions of mouse dragging and mouse wheel zooming respectively. In particular, we use a timer to control the smooth scrolling and animation effects of the scene.

Among them, the _prevX and _prevY variables record the position of the previous mouse point, the _offsetX and _offsetY variables record the offset of the current scene, the _dragging variable is used to record whether dragging is being performed, and the _sensitivity variable is used to Determine the sensitivity of the mouse wheel. The _direction vector variable is used to control the rolling direction of the scene in the timer. The _directionSpeed ​​variable records the speed of the mouse wheel direction.

Finally, we reference the above function in HTML and run it to achieve a complete 360-degree panoramic display interface.

nbsp;html>

  
    
    
    
    <script></script>
  
  
    <div></div>
  

To sum up, the 360-degree panoramic display effect realized by native JavaScript is not complicated. It only requires a little basic knowledge of JavaScript and imagination to complete a simple and practical panoramic display component.

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