D3

The D3 plugin enables custom data visualizations using D3.js.

Installation

pnpm add @teamflojo/floimg-d3

Registration

import createClient from '@teamflojo/floimg';
import d3 from '@teamflojo/floimg-d3';

const floimg = createClient();
floimg.registerGenerator(d3());

Usage

const visualization = await floimg.generate({
  generator: 'd3',
  params: {
    width: 600,
    height: 400,
    render: (svg, d3) => {
      // D3.js code here
      svg.append('circle')
        .attr('cx', 300)
        .attr('cy', 200)
        .attr('r', 50)
        .attr('fill', '#7c3aed');
    }
  }
});

Parameters

Parameter	Type	Required	Description
width	number	Yes	SVG width in pixels
height	number	Yes	SVG height in pixels
render	function	Yes	D3 render function
backgroundColor	string	No	Background color

Examples

Bar Chart

const data = [
  { label: 'A', value: 30 },
  { label: 'B', value: 80 },
  { label: 'C', value: 45 },
  { label: 'D', value: 60 },
  { label: 'E', value: 20 }
];

const chart = await floimg.generate({
  generator: 'd3',
  params: {
    width: 500,
    height: 300,
    render: (svg, d3) => {
      const margin = { top: 20, right: 20, bottom: 30, left: 40 };
      const width = 500 - margin.left - margin.right;
      const height = 300 - margin.top - margin.bottom;

      const g = svg.append('g')
        .attr('transform', `translate(${margin.left},${margin.top})`);

      const x = d3.scaleBand()
        .range([0, width])
        .padding(0.1)
        .domain(data.map(d => d.label));

      const y = d3.scaleLinear()
        .range([height, 0])
        .domain([0, d3.max(data, d => d.value)]);

      g.selectAll('.bar')
        .data(data)
        .enter().append('rect')
        .attr('class', 'bar')
        .attr('x', d => x(d.label))
        .attr('y', d => y(d.value))
        .attr('width', x.bandwidth())
        .attr('height', d => height - y(d.value))
        .attr('fill', '#7c3aed');

      g.append('g')
        .attr('transform', `translate(0,${height})`)
        .call(d3.axisBottom(x));

      g.append('g')
        .call(d3.axisLeft(y));
    }
  }
});

Force-Directed Graph

const nodes = [
  { id: 'A' }, { id: 'B' }, { id: 'C' }, { id: 'D' }, { id: 'E' }
];
const links = [
  { source: 'A', target: 'B' },
  { source: 'A', target: 'C' },
  { source: 'B', target: 'D' },
  { source: 'C', target: 'E' }
];

const graph = await floimg.generate({
  generator: 'd3',
  params: {
    width: 600,
    height: 400,
    render: (svg, d3) => {
      const simulation = d3.forceSimulation(nodes)
        .force('link', d3.forceLink(links).id(d => d.id))
        .force('charge', d3.forceManyBody().strength(-200))
        .force('center', d3.forceCenter(300, 200));

      // Run simulation synchronously
      for (let i = 0; i < 300; i++) simulation.tick();

      svg.selectAll('line')
        .data(links)
        .enter().append('line')
        .attr('x1', d => d.source.x)
        .attr('y1', d => d.source.y)
        .attr('x2', d => d.target.x)
        .attr('y2', d => d.target.y)
        .attr('stroke', '#94a3b8');

      svg.selectAll('circle')
        .data(nodes)
        .enter().append('circle')
        .attr('cx', d => d.x)
        .attr('cy', d => d.y)
        .attr('r', 20)
        .attr('fill', '#7c3aed');

      svg.selectAll('text')
        .data(nodes)
        .enter().append('text')
        .attr('x', d => d.x)
        .attr('y', d => d.y)
        .attr('text-anchor', 'middle')
        .attr('dy', 5)
        .attr('fill', 'white')
        .text(d => d.id);
    }
  }
});

Treemap

const data = {
  name: 'root',
  children: [
    { name: 'A', value: 100 },
    { name: 'B', value: 80 },
    { name: 'C', value: 60 },
    { name: 'D', value: 40 },
    { name: 'E', value: 20 }
  ]
};

const treemap = await floimg.generate({
  generator: 'd3',
  params: {
    width: 600,
    height: 400,
    render: (svg, d3) => {
      const root = d3.hierarchy(data).sum(d => d.value);

      d3.treemap()
        .size([600, 400])
        .padding(2)(root);

      const color = d3.scaleOrdinal(d3.schemeCategory10);

      svg.selectAll('rect')
        .data(root.leaves())
        .enter().append('rect')
        .attr('x', d => d.x0)
        .attr('y', d => d.y0)
        .attr('width', d => d.x1 - d.x0)
        .attr('height', d => d.y1 - d.y0)
        .attr('fill', d => color(d.data.name));

      svg.selectAll('text')
        .data(root.leaves())
        .enter().append('text')
        .attr('x', d => d.x0 + 5)
        .attr('y', d => d.y0 + 20)
        .text(d => d.data.name)
        .attr('fill', 'white');
    }
  }
});

Tips

1. Synchronous rendering: The render function must complete synchronously. For force simulations, run ticks in a loop.

2. Data binding: Pass data through closure or include it in the render function.

3. Scales and axes: Use D3’s scale and axis functions for proper data visualization.

See Also

• Generate - Core generation method
• QuickChart - Simple charts
• Mermaid - Diagrams

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Want to experiment visually? Try D3 in floimg-studio →