Implement API to generate map image

Currently the logic of generate a image of the map is packaged inside kepler. and it’s not easy to access via dependency injection. We can design a action / callback API to allow user to dispatch action and pass a call back to save the generated map image, Something like this:

import {generateMapImage} from 'kepler.gl/actions';
// dispatch an action to retrieve map thumbnail upon user interaction, pass dimension and onUpdate callback
onClick() {
   this.props.dispatch(generateMapImage({
          dmension: {width: 500, height: 500, resolution: 2},
          onUpdate: (dataUrl) => this.props.saveCurrentMapImage(dataUrl)
   )
}

https://github.com/keplergl/kepler.gl/issues/974

[mayteio]

Any movement here? Can you outline what needs to be done and I can have a crack at it?

[ejrtn]

Uncaught (in promise) TypeError: Object(…) is not a function

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