General Update Pattern practice

General Update Pattern

This example demonstrates the general update pattern in D3.js by animating a sequence of fruit circles in an SVG bowl. It shows how elements are added, modified, and removed over time—an apple disappears, one apple turns into a lemon, and another apple is deleted. The visualization uses the D3.js `select`, `selectAll`, and `transition` APIs to handle entering, updating, and exiting circles, with `scaleOrdinal` mapping fruit types to colors and radii. A timer-driven script triggers changes to the array of fruit objects, which the `fruitBowl` function renders with a one-second transition animation.

Vvkanotra

General Update Pattern

A colorful bowl of fruit demonstrates D3's general update pattern using SVG circles and animated transitions. The `fruitBowl` function binds an array of fruit objects to circles, employing `selection.enter`, `selection.merge`, and `selection.exit` to handle additions, updates, and removals. `d3.scaleOrdinal` maps fruit types to fill colors and radius sizes, while `transition` animates positions and sizes. Timers in `index.js` trigger state changes, popping fruits, swapping an apple for a lemon, and removing items, showing how circles gracefully grow, shrink, or disappear over one-second intervals.

MMatt Morris

Bowl of Fruit - General Update Pattern

This example demonstrates the general update pattern for animating SVG circles, where fruits (apples and lemons) appear as colored circles that grow, change color, and shrink when the underlying data array is modified. The visualization uses D3 v5's selection API with `.enter()`, `.merge()`, and `.exit()` methods to handle data changes, while `transition().duration(1000)` animates radius and x-position over one second. The code imports `scaleOrdinal` for color and radius mappings, and triggers updates via `setTimeout` to simulate eating and replacing fruit.

Bbbroker

Bowl of Fruit - General Update Pattern

Five circles representing fruit enter an SVG with zero radius and grow into apples. The example demonstrates D3’s general update pattern, animating exits by shrinking circles to zero and modifying existing fruits via the data join. Using `d3.scaleOrdinal` for color and radius, it transitions enter, update, and exit selections over one second. Hovering highlights a circle with a black stroke via mouse events. Over three seconds, `setTimeout` removes a fruit, changes a type to lemon, and filters another element, showing joins and transitions.

Jjhofang

Bowl of Fruit - General Update Pattern

This example demonstrates the D3 general update pattern with a bowl of fruit rendered as SVG circles. Apples and lemons are distinguished by color and radius using `scaleOrdinal`, while animated transitions adjust circle positions and sizes over one second. The code explicitly manages enter, update, and exit selections, shrinking removed fruit to zero radius via `transition.attr('r', 0)` and `.remove()`. Data mutations—deleting an apple, changing one to a lemon, and filtering another—occur at timed intervals, showing how the visualization responds to changing data through D3 v5's data join.

ZZ-Richard

General Update Pattern with animation

Five fruits sit in a bowl as circles with colored fills and text labels. Every second, an apple is eaten or replaced with a lemon, triggering an animated transition that smoothly slides all remaining fruits into new positions over one second via `selection.merge().transition()`. The example demonstrates the general update pattern, using a key function on fruit IDs to track enter, update, and exit selections. Rendering relies on SVG elements built with D3 v6, applying ordinal color and radius scales from `d3.scaleOrdinal`.

PPiotr Paszek

Bowl of Fruit - General Update Pattern

Five fruit circles enter an SVG bowl and animate to their positions. This example demonstrates the D3 general update pattern by eating apples, replacing one with a lemon, and removing another, all with smooth transitions. The code uses d3.select, d3.range, scaleOrdinal for color and radius, and transition().duration() for animation. Each fruit has an id for keyed data joins, and exit selections shrink to zero radius before removal.

PPiotr Paszek

Bowl of Fruit - General Update Pattern

Five fruits—apples and a lemon—sit in a row, animating in and out of a bowl. The example demonstrates the general update pattern: entering circles scale up from radius zero, exiting circles shrink to zero, and the one changed apple transitions into a lemon with a new color and radius. Built with d3.v6 and the `select`, `scaleOrdinal`, and `.transition().duration()` API, the SVG circles are driven by a `fruitBowl` function that handles enter, merge, and exit states.

Aanuj1450