React Native SVG Charts

What is React-native-svg-charts?

React Native SVG Charts is a library that allows developers to create visually appealing and interactive charts in React Native applications. Built on top of React Native and SVG (Scalable Vector Graphics), this library provides a wide range of chart types, such as line charts, bar charts, pie charts, and more. It offers a flexible and customizable solution for displaying data in a visually appealing manner, enabling users to make sense of complex information at a glance.

Prerequisites

To get started with React Native SVG Charts, you need to have the following prerequisites:

• React Native project:
  Ensure that you have a React Native project set up on your development machine.
• Node.js and npm:
  Make sure you have Node.js and npm (Node Package Manager) installed on your system. You can download them from the official Node.js website.
• Basic knowledge of React Native:
  Familiarity with React Native concepts, such as components, props, and state management, will be beneficial while working with React Native SVG Charts.

Installations

To install React Native SVG Charts, follow these steps:

Open your React Native project in a terminal or command prompt. Run the following command to install the library from npm:

Once the installation is complete, you can import the necessary components from the library into your project and start utilizing the various chart types.

Props

Here are some common props that are typically used in this library:

• data (required):
  This prop specifies the data that will be used to generate the chart. It usually takes an array of objects, where each object represents a data point with key-value pairs for the chart's X and Y values.
• width and height:
  These props determine the width and height of the chart component. You can specify them as a numeric value (e.g., width={200}) or as a percentage of the parent container (e.g., width="80%").
• style:
  The style prop allows you to apply custom styles to the chart component. You can use it to control the appearance of the chart, such as setting the background color, borders, or positioning.
• svg:
  This prop allows you to pass additional SVG attributes to the underlying SVG container element. You can use it to set properties like viewBox, preserveAspectRatio, or xmlns.
• xAccessor and yAccessor:
  These props define the accessors for the X and Y values in the data array. They specify which object properties to use as the X and Y values when rendering the chart.
• xScale and yScale:
  These props determine the scaling or mapping of the X and Y values to the chart's coordinate system. You can choose from various scale types like linear, logarithmic, time, or custom scales.
• contentInset:
  The contentInset prop allows you to define padding or margins around the chart area. It helps in adjusting the visible area of the chart within the component's boundaries.
• gridMin and gridMax:
  These props allow you to set the minimum and maximum values for the grid lines on the chart. They control the range of values displayed on the chart's axes.
• curve:
  This prop specifies the type of curve interpolation to be applied to the chart line. You can choose from options like linear, natural, monotoneX, monotoneY, stepBefore, or stepAfter.
• color and fill:
  These props determine the color of the chart line or area. You can set them to a specific color value or use functions to dynamically assign colors based on data values or conditions.
• gradient:
  The gradient prop enables the use of gradients for filling the chart area. You can specify gradient colors and configurations to create visually appealing effects.
• showGrid:
  This prop controls the visibility of the grid lines on the chart. You can set it to true or false to show or hide the grid, respectively.

These are just some of the common props used in React Native SVG Charts. Depending on the specific chart type and requirements, there may be additional props available to customize and enhance the chart's appearance and functionality.

Components

• AreaChart:
  This component renders an area chart, which is useful for visualizing data trends and highlighting the area under the curve. Here's an example of creating an AreaChart component:

2. StackedAreaChart:
   The StackedAreaChart component is similar to an area chart but allows for multiple sets of data to be stacked together. To utilize this chart effectively, it is recommended to familiarize yourself with d3 stacks, which can provide a better understanding of the chart and its props. Additionally, you can utilize the svgs prop to pass in props compliant with react-native-svg to customize each area in the chart.

3. BarChart:
   Renders a bar chart, which displays rectangular bars to represent data values. It is useful for comparing values across different categories or groups.

4. StackedBarChart:
   The GroupedBarChart component is similar to the StackedAreaChart, but instead of displaying stacked areas, it uses bars to represent data sets. It is recommended to familiarize yourself with d3 stacks to gain a better understanding of this chart and its props. In contrast to the StackedAreaChart, the svgs prop in the GroupedBarChart is based on entries rather than keys. This allows users to specify different props for each entry within each bar. Each key entry can contain a complex object, including an svg prop, providing greater flexibility for customization.

5. Line Chart:
   Renders a line chart, which displays data points as connected lines. It is useful for showing trends or patterns over time or other continuous data.

6. LineChart:
   Renders a pie chart, which displays data as proportional slices of a circle. It is useful for showing the proportions or percentages of a whole.

7. ProgressCircle:
   The ProgressCircle component in React Native SVG Charts is used to render a circular progress indicator. It represents a value as a filled portion of a circle, allowing you to display progress or completion visually.

8. YAxis:
   The YAxis component in React Native SVG Charts is a helpful tool for positioning your Y-axis labels in alignment with your chart. To ensure accurate alignment, the YAxis component must have the same view bounds as the chart it is intended to match. Ideally, both components should be wrapped within the same parent view.

9. XAxis:
   The XAxis component in React Native SVG Charts serves as a useful tool for positioning your X-axis labels in coordination with your chart. The component must have the same view bounds as the chart it is intended to match, preferably wrapped within the same parent view. Additionally, the XAxis component supports the xAccessor prop. If this prop is not supplied, the component assumes that you are solely interested in the index of the dataset.

Common Arguements

• x: a method that typically takes a data point's index and returns its 'x' coordinates on the canvas
• y: a function that typically takes a data point's value and returns the point's 'y' coordinates on the canvas
• width: the canvas's width in pixels
• height: the canvas's height in pixels
• data: If you want decorators on each data point, utilize the same data array that the chart was given to map over your data points.
• ticks: If the chart has been given a numberOfTicks parameter, this array will contain the computed tick values (useful for grids).