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Interaction

Interactions provide an API to bind events to a picasso chart in a declarative way.

Using interactions in a chart

Each interaction has a type property that identifies the type of interaction to add to the chart.

To define an interaction, you need to add them in the interactions array:

picasso.chart({
  settings: {
    interactions: [{
      type: 'native',
      key: 'someKey',
      enable: /* ... */,
      events: { /* ... */ }
    }, {
      type: 'hammer',
      key: 'anotherKey',
      enable: /* ... */,
      gestures: { /* ... */ }
    }]
  }
});

Bundled interactions

picasso.js comes pre-bundled with a native interaction definition:

interactions: [
  {
    type: 'native',
    key: 'here',
    enable: function() {  // bool or function
      this.chart /*...*/;
      return true;
    },
    events: {
      mousemove: function(e) { // key should point to a native event
        // handle event here
      },
      keydown: function(e) {
        // handle event here
      }
    }
  }
]

... and together with picasso the following interaction plugin is shipped:

• hammer

Register a custom interaction

To register a new interaction, use the picasso.interaction registry.

picasso.interaction(name, definition)

• name string. Name of the interaction to register.
• definition object
  • key getter (optional) Returns the key identifier for this definition. Used for making updates with changes to the definition a smooth ride.
  • set function Set interaction settings and add/update event handlers to the chart element.
  • off function Turn off interactions.
  • on function Turn on interactions.
  • destroy function Remove all bound events.