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Parallel coordinates display multiple dimensions as parallel axes, rather than orthogonal axes, as for rectangular coordinates. Parallel coordinates are defined by the ParallelCoord object, which accepts a set of Scale objects as input.
To understand parallel coordinates, consider the following data set, which contains scores for three students over three consecutive tests.
| Test 1 |
Test 2 |
Test 3 |
Name |
| 200 |
175 |
50 |
Joe |
| 800 |
1000 |
300 |
Jane |
| 10 |
15 |
20 |
Fred |
By plotting this data on three parallel coordinates ('Test 1', 'Test 2', 'Test 3'), you can visualize trends across the different tests. To create this chart, follow the steps below:
- Define the data set and chart objects.
importPackage(inetsoft.graph)
importPackage(inetsoft.graph.element)
importPackage(inetsoft.graph.scale)
importPackage(inetsoft.graph.aesthetic)
importPackage(inetsoft.graph.coord)
importPackage(inetsoft.graph.data)
var arr = [["Test1","Test2","Test3","Name"],
[100,80,20,'Joe'],[75,50,40,'Jane'],
[50,30,80,'Fred']];
dataset = new DefaultDataSet(arr);
graph = new EGraph();
- Create a new LineElement object to define a line-style chart, and assign its dimensions.
var elem = new LineElement();
elem.addDim("Test1");
elem.addDim("Test2");
elem.addDim("Test3");
- Define the scales used for the three axes. (In this case the scales are the same for all three.)
var scale1 = new LinearScale("Test1");
var scale2 = new LinearScale("Test2");
var scale3 = new LinearScale("Test3");
scale1.setMax(100);
scale2.setMax(100);
scale3.setMax(100);
scale1.setMin(0);
scale2.setMin(0);
scale3.setMin(0);
- Create the new ParallelCoord object using the defined scales.
var coord = new ParallelCoord(scale1,scale2,scale3);
- Use a CategoricalColorFrame to distinguish the three students. Assign the frame to the line element.
var frame = new CategoricalColorFrame("Name");
elem.setColorFrame(frame);
- Assign the parallel coordinate system to the chart.
graph.addElement(elem);
graph.setCoordinate(coord);
The complete script is shown below:
importPackage(inetsoft.graph)
importPackage(inetsoft.graph.element)
importPackage(inetsoft.graph.scale)
importPackage(inetsoft.graph.aesthetic)
importPackage(inetsoft.graph.coord)
importPackage(inetsoft.graph.data)
var arr = [["Test1","Test2","Test3","Name"],
[100,80,20,'Joe'],[75,50,40,'Jane'],
[50,30,80,'Fred']];
dataset = new DefaultDataSet(arr);
graph = new EGraph();
var elem = new LineElement();
elem.addDim("Test1");
elem.addDim("Test2");
elem.addDim("Test3");
var scale1 = new LinearScale("Test1");
var scale2 = new LinearScale("Test2");
var scale3 = new LinearScale("Test3");
scale1.setMax(100);
scale2.setMax(100);
scale3.setMax(100);
scale1.setMin(0);
scale2.setMin(0);
scale3.setMin(0);
var coord = new ParallelCoord(scale1,scale2,scale3);
var frame = new CategoricalColorFrame("Name");
elem.setColorFrame(frame);
graph.addElement(elem);
graph.setCoordinate(coord);
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