# Graph3d

## Overview

Graph3d is an interactive visualization chart to draw data in a three dimensional graph. You can freely move and zoom in the graph by dragging and scrolling in the window. Graph3d also supports animation of a graph.

Graph3d uses HTML canvas to render graphs, and can render up to a few thousands of data points smoothly.

## Contents

- Overview
- Loading
- Data Format
- Configuration Options
- Methods
- Events
- Data Policy

## Example

The following code shows how to create a Graph3d and provide it with data. More examples can be found in the examples directory.

    <!DOCTYPE HTML>
    <html>
    <head>
      <title>Graph 3D demo</title>

      <style>
        body {font: 10pt arial;}
      </style>

      <script type="text/javascript" src="../../dist/vis.js"></script>

      <script type="text/javascript">
      var data = null;
      var graph = null;

      function custom(x, y) {
        return (Math.sin(x/50) * Math.cos(y/50) * 50 + 50);
      }

      // Called when the Visualization API is loaded.
      function drawVisualization() {
        // Create and populate a data table.
        var data = new vis.DataSet();
        // create some nice looking data with sin/cos
        var steps = 50;  // number of datapoints will be steps*steps
        var axisMax = 314;
        var axisStep = axisMax / steps;
        for (var x = 0; x < axisMax; x+=axisStep) {
          for (var y = 0; y < axisMax; y+=axisStep) {
            var value = custom(x, y);
            data.add({
              x: x,
              y: y,
              z: value,
              style: value
            });
          }
        }

        // specify options
        var options = {
          width:  '600px',
          height: '600px',
          style: 'surface',
          showPerspective: true,
          showGrid: true,
          showShadow: false,
          keepAspectRatio: true,
          verticalRatio: 0.5
        };

        // create a graph3d
        var container = document.getElementById('mygraph');
        graph3d = new vis.Graph3d(container, data, options);
      }
      </script>
    </head>

    <body onload="drawVisualization();">
      <div id="mygraph"></div>
    </body>
    </html>

## Loading

The class name of the Graph3d is `vis.Graph3d`. When constructing a Graph3d, an HTML DOM container must be provided to attach the graph to. Optionally, data an options can be provided. Data is a vis `DataSet` or an `Array`, described in section Data Format. Options is a name-value map in the JSON format. The available options are described in section Configuration Options.

    var graph = new vis.Graph3d(container [, data] [, options]);

Data and options can be set or changed later on using the functions `Graph3d.setData(data)` and `Graph3d.setOptions(options)`.

## Data Format

Graph3d can load data from an `Array`, a `DataSet` or a `DataView`. JSON objects are added to this DataSet by using the `add()` function. Data points must have properties `x`, `y`, and `z`, and can optionally have a property `style` and `filter`.

### Definition

The DataSet JSON objects are defined as:

Name | Type | Required | Description
--- | --- | --- | ---
x | number | yes | Location on the x-axis.
y | number | yes | Location on the y-axis.
z | number | yes | Location on the z-axis.
style | number | no | The data value, required for graph styles `dot-color` and `dot-size`.
filter | * | no | Filter values used for the animation. This column may have any type, such as a number, string, or Date.

## Configuration Options

Options can be used to customize the graph. Options are defined as a JSON object. All options are optional.

    var options = {
        width:  '100%',
        height: '400px',
        style: 'surface'
    };

The following options are available.

Name | Type | Default | Description
--- | --- | --- | ---
animationInterval | number | 1000 | The animation interval in milliseconds. This determines how fast the animation runs.
animationPreload | boolean | false | If false, the animation frames are loaded as soon as they are requested. if `animationPreload` is true, the graph will automatically load all frames in the background, resulting in a smoother animation as soon as all frames are loaded. The load progress is shown on screen.
animationAutoStart | boolean | false | If true, the animation starts playing automatically after the graph is created.
axisColor | string | '#4D4D4D' | The color of the axis lines and the text along the axis.
backgroundColor | string or Object | {fill: 'white', stroke: 'gray', strokeWidth: 1} | The background color for the main area of the chart. Can be either a simple HTML color string, for example: 'red' or '#00cc00', or an object with the following properties.
backgroundColor.fill | string | 'white' | The chart fill color, as an HTML color string.
backgroundColor.stroke | string | 'gray' | The color of the chart border, as an HTML color string.
backgroundColor.strokeWidth | number | 1 | The border width, in pixels.

cameraPosition

Object

{horizontal: 1.0, vertical: 0.5, distance: 1.7}

Set the initial rotation and position of the camera. The object `cameraPosition` contains three parameters: `horizontal`, `vertical`, and `distance`. Parameter `horizontal` is a value in radians and can have any value (but normally in the range of 0 and 2*Pi). Parameter `vertical` is a value in radians between 0 and 0.5*Pi. Parameter `distance` is the (normalized) distance from the camera to the center of the graph, in the range of 0.71 to 5.0. A larger distance puts the graph further away, making it smaller. All parameters are optional.

dataColor | string or object | {fill: '#7DC1FF', stroke: '#3267D2', strokeWidth: 1} | When `dataColor` is a string, it will set the color for both border and fill color of dots and bars. Applicable for styles `dot-size`, `bar-size`, and `line`. When an object, it can contain the properties descibed below.
dataColor.fill | string | '#7DC1FF' | The border color of the dots or bars. Applicable when using styles `dot-size` or `bar-size`.
dataColor.stroke | string | '#3267D2' | The fill color of the dots or bars. Applicable when using styles `dot-size`, `bar-size`, or `line`.
dataColor.strokeWidth | number | 1 | The line width of dots, bars and lines. Applicable for all styles.
gridColor | string | '#D3D3D3' | The color of the grid lines.
height | string | '400px' | The height of the graph in pixels or as a percentage.
keepAspectRatio | boolean | true | If `keepAspectRatio` is true, the x-axis and the y-axis keep their aspect ratio. If false, the axes are scaled such that they both have the same, maximum with.
showAnimationControls | boolean | true | If true, animation controls are created at the bottom of the Graph. The animation controls consists of buttons previous, start/stop, next, and a slider showing the current frame. Only applicable when the provided data contains an animation.
showGrid | boolean | true | If true, grid lines are draw in the x-y surface (the bottom of the 3d graph).
showPerspective | boolean | true | If true, the graph is drawn in perspective: points and lines which are further away are drawn smaller. Note that the graph currently does not support a gray colored bottom side when drawn in perspective.
showShadow | boolean | false | Show shadow on the graph.
style | string | 'dot' | The style of the 3d graph. Available styles: `bar`, `bar-color`, `bar-size`, `dot`, `dot-line`, `dot-color`, `dot-size`, `line`, `grid`, or `surface`
tooltip | boolean | function | false | Show a tooltip showing the values of the hovered data point. The contents of the tooltip can be customized by providing a callback function as `tooltip`. In this case the function is called with an object containing parameters `x`, `y`, and `z` argument, and must return a string which may contain HTML.
valueMax | number | none | The maximum value for the value-axis. Only available in combination with the styles `dot-color` and `dot-size`.
valueMin | number | none | The minimum value for the value-axis. Only available in combination with the styles `dot-color` and `dot-size`.
verticalRatio | number | 0.5 | A value between 0.1 and 1.0. This scales the vertical size of the graph When keepAspectRatio is set to false, and verticalRatio is set to 1.0, the graph will be a cube.
width | string | '400px' | The width of the graph in pixels or as a percentage.
xBarWidth | number | none | The width of bars in x direction. By default, the width is equal to the distance between the data points, such that bars adjoin each other. Only applicable for styles `'bar'` and `'bar-color'`.
xCenter | string | '55%' | The horizontal center position of the graph, as a percentage or in pixels.
xMax | number | none | The maximum value for the x-axis.
xMin | number | none | The minimum value for the x-axis.
xStep | number | none | Step size for the grid on the x-axis.
xValueLabel | function | none | A function for custom formatting of the labels along the x-axis, for example `function (x) {return (x * 100) + '%'}`.
yBarWidth | number | none | The width of bars in y direction. By default, the width is equal to the distance between the data points, such that bars adjoin each other. Only applicable for styles `'bar'` and `'bar-color'`.
yCenter | string | '45%' | The vertical center position of the graph, as a percentage or in pixels.
yMax | number | none | The maximum value for the y-axis.
yMin | number | none | The minimum value for the y-axis.
yStep | number | none | Step size for the grid on the y-axis.
yValueLabel | function | none | A function for custom formatting of the labels along the y-axis, for example `function (y) {return (y * 100) + '%'}`.
zMin | number | none | The minimum value for the z-axis.
zMax | number | none | The maximum value for the z-axis.
zStep | number | none | Step size for the grid on the z-axis.
zValueLabel | function | none | A function for custom formatting of the labels along the z-axis, for example `function (z) {return (z * 100) + '%'}`.
xLabel | String | x | Label on the X axis.
yLabel | String | y | Label on the Y axis.
zLabel | String | z | Label on the Z axis.
filterLabel | String | time | Label for the filter column.
legendLabel | String | value | Label for the style description.

## Methods

Graph3d supports the following methods.

Method | Return Type | Description
--- | --- | ---
animationStart() | none | Start playing the animation. Only applicable when animation data is available.
animationStop() | none | Stop playing the animation. Only applicable when animation data is available.
getCameraPosition() | An object with parameters `horizontal`, `vertical` and `distance` | Returns an object with parameters `horizontal`, `vertical` and `distance`, which each one of them is a number, representing the rotation and position of the camera.
redraw() | none | Redraw the graph. Useful after the camera position is changed externally, when data is changed, or when the layout of the webpage changed.
setData(data) | none | Replace the data in the Graph3d.
setOptions(options) | none | Update options of Graph3d. The provided options will be merged with current options.
setSize(width, height) | none | Parameters `width` and `height` are strings, containing a new size for the graph. Size can be provided in pixels or in percentages.

setCameraPosition (pos)

{horizontal: 1.0, vertical: 0.5, distance: 1.7}

Set the rotation and position of the camera. Parameter `pos` is an object which contains three parameters: `horizontal`, `vertical`, and `distance`. Parameter `horizontal` is a value in radians and can have any value (but normally in the range of 0 and 2*Pi). Parameter `vertical` is a value in radians between 0 and 0.5*Pi. Parameter `distance` is the (normalized) distance from the camera to the center of the graph, in the range of 0.71 to 5.0. A larger distance puts the graph further away, making it smaller. All parameters are optional.

## Events

Graph3d fires events after the camera position has been changed. The event can be catched by creating a listener. Here an example on how to catch a `cameraPositionChange` event.

    function onCameraPositionChange(event) {
      alert('The camera position changed to:\n' +
            'Horizontal: ' + event.horizontal + '\n' +
            'Vertical: ' + event.vertical + '\n' +
            'Distance: ' + event.distance);
    }
    // assuming var graph3d = new vis.Graph3d(document.getElementById('mygraph'));
    graph3d.on('cameraPositionChange', onCameraPositionChange);

The following events are available.

name | Properties | Description
--- | --- | ---

cameraPositionChange

- `horizontal`: Number. The horizontal angle of the camera.
- `vertical`: Number. The vertical angle of the camera.
- `distance`: Number. The distance of the camera to the center of the graph.

The camera position changed. Fired after the user modified the camera position by moving (dragging) the graph, or by zooming (scrolling), but not after a call to `setCameraPosition` method. The new camera position can be retrieved by calling the method `getCameraPosition`.

## Data Policy

All code and data are processed and rendered in the browser. No data is sent to any server.