How can symbols be modified on the OpenLayers WebGLPointsLayer by adding, removing, or changing them?

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To modify symbols on the OpenLayers WebGLPointsLayer, you can use the following methods:

1. Adding symbols: You can add symbols to the layer by adding new features to its source. For example, you can create a new feature with a different symbol and add it to the source using the addFeatures() method.

2. Removing symbols: To remove symbols, you can use the removeFeature() method to remove the feature with the symbol that you want to remove.

3. Changing symbols: To change symbols, you can modify the style of the feature. You can create a new style and assign it to the feature using the setStyle() method.

Here is an example of how to modify the symbol of a feature on the WebGLPointsLayer:

const style = new Style({
  image: new Circle({
    radius: 5,
    fill: new Fill({
      color: "#ffcc33",
    }),
  }),
});

const feature = new Feature(new Point([0, 0]));
feature.setStyle(style);

const source = new VectorSource({
  features: [feature],
});

const layer = new WebGLPointsLayer({
  source: source,
});

// Modify the symbol of the feature
const newStyle = new Style({
  image: new Circle({
    radius: 10,
    fill: new Fill({
      color: "#ff0000",
    }),
  }),
});
feature.setStyle(newStyle);