Loading animation special effects based on HTML5 Canvas and Rebound animation

Brief Tutorial

This is a Loading animation special effect based on HTML5 canvas and Rebound animation. The loading animation uses a canvas to cover the entire page and displays a polygonal loading loader to represent the loading progress.

1. Create a SpringSystem.

// Create a SpringSystem.
  let springSystem = new rebound.SpringSystem();

2. Add a spring to the system.

// Add a spring to the system.
  demo.spring = springSystem.createSpring(settings.tension, settings.friction);

3. Add SpringListener event monitoring for spring.

_addSpringListener() {
 
  let ctx = this;
 
  // Add a listener to the spring. Every time the physics
  // solver updates the Spring's value onSpringUpdate will
  // be called.
  this._spring.addListener({
    // ...
  });
}

4. Set the end animation value of the spring, and the parameter is the current value of the start animation.

this._spring.setEndValue((this._spring.getCurrentValue() === 1) ? 0 : 1);

5. Set the animation progress in the onSpringUpdate callback function.

onSpringUpdate(spring) {
 
  let val = spring.getCurrentValue();
 
  // Input range in the `from` parameters.
  let fromLow = 0,
    fromHigh = 1,
    // Property animation range in the `to` parameters.
    toLow = ctx._springRangeLow,
    toHigh = ctx._springRangeHigh;
 
  val = rebound.MathUtil.mapValueInRange(val, fromLow, fromHigh, toLow, toHigh);
 
  // Note that the render method is
  // called with the spring motion value.
  ctx.render(val);
}

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