# Brush & Zoom

A year of data behind the window mechanism: drag the brush handles (or the window body) to slice it, drag a range on the plot to zoom in, double-click to reset. Everything recomputes client-side.

## Default

```erb
<%# The window mechanism (frame.window slices the full dataset): the brush
    strip below the plot slices the year, dragging a range on the plot
    zooms in, double-click resets. All of it recomputes client-side -
    setWindow renders instantly, no tween mid-drag. %>
<% data = Array.new(12) do |i|
     { month: Date::ABBR_MONTHNAMES[i + 1],
       desktop: (200 + (Math.sin(i / 1.8) * 120) + (i * 8)).round }
   end %>
<div class="w-full max-w-xl">
  <%= poetry_chart :line, data: data, id: "window-demo", live: true, zoom: true,
                   config: { desktop: { label: "Desktop", color: "var(--chart-1)" } },
                   margin: { left: 12, right: 12 } do |chart| %>
    <% chart.with_grid %>
    <% chart.with_x_axis data_key: :month %>
    <% chart.with_y_axis tick_count: 3 %>
    <% chart.with_line data_key: :desktop, curve: :monotone_x %>
    <% chart.with_brush %>
    <% chart.with_tooltip %>
  <% end %>
</div>
```