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Spline Charts
Spline charts are a specialized form of line charts that display smooth curves through the different data points.
In this section, you will be introduced to the:
-
Basics of spline charts
-
Types of spline charts
Basics of Spline Charts
Spline charts integrate all the characteristics of a conventional line chart except for the fact that unlike line charts, which connect data points with straight lines, spline charts draw a fitted curved line to join the data points.
Spline charts can be used for plotting data that requires the usage of curve-fitting e.g. an impulse-response chart, a product life cycle chart, etc. It is also significantly used in designing Pareto charts.
Types
FusionCharts Suite XT includes four types of spline charts:
-
Single-series spline 2D chart
-
Multi-series spline 2D chart
-
Single-series spline area 2D chart
-
Multi-series spline area 2D chart
Single-series Spline 2D Chart
A single-series spline 2D chart draws a single fitted curve through the data points.
A simple single-series spline 2D chart looks like this:
The data structure needed to render a single-series spline 2D chart is given below:
{
"chart": {
"caption": "Total footfall in Bakersfield Central",
"subCaption": "Last week",
"xAxisName": "Day",
"yAxisName": "No. of Footfalls",
"lineThickness": "2",
"paletteColors": "#008ee4,#6baa01",
"baseFontColor": "#333333",
"baseFont": "Helvetica Neue,Arial",
"captionFontSize": "14",
"subcaptionFontSize": "14",
"subcaptionFontBold": "0",
"showBorder": "0",
"showValues": "0",
"bgColor": "#ffffff",
"showShadow": "0",
"canvasBgColor": "#ffffff",
"canvasBorderAlpha": "0",
"divlineAlpha": "100",
"divlineColor": "#999999",
"divlineThickness": "1",
"divLineIsDashed": "1",
"divLineDashLen": "1",
"divLineGapLen": "1",
"showXAxisLine": "1",
"xAxisLineThickness": "1",
"xAxisLineColor": "#999999",
"showAlternateHGridColor": "0"
},
"data": [
{
"label": "Mon",
"value": "15123"
},
{
"label": "Tue",
"value": "14233"
},
{
"label": "Wed",
"value": "25507"
},
{
"vline": "true",
"lineposition": "0",
"color": "#6baa01",
"labelHAlign": "left",
"label": "National holiday"
},
{
"label": "Thu",
"value": "9110"
},
{
"label": "Fri",
"value": "15529"
},
{
"label": "Sat",
"value": "20803"
},
{
"label": "Sun",
"value": "19202"
}
]
}Multi-series Spline 2D Chart
A simple multi-series spline 2D chart looks like this:
To render a multi-series spline chart:
-
Set the
typeattribute tomsspline. -
Use the
seriesnameattribute and thedataobject, which belong to thedatasetobject, to specify multiple datasets.
Multi-series Spline Area 2D Chart
A multi-series spline area 2D chart is nothing but a conventional area with a smoothened curve drawn through the data points in the series. It allows you to plot data for multiple data sets.
A simple multi-series spline area 2D chart looks like this:
The data structure needed to render a multi-series spline area 2D chart is given below:
{
"chart": {
"caption": "Number of Footfalls Last Week",
"subCaption": "Garden Groove harbour vs Crompton-Rancho Dom",
"xAxisName": "Day",
"yAxisName": "No. of Footfalls",
"captionFontSize": "14",
"subcaptionFontSize": "14",
"baseFontColor": "#333333",
"baseFont": "Helvetica Neue,Arial",
"subcaptionFontBold": "0",
"paletteColors": "#6baa01,#008ee4",
"usePlotGradientColor": "0",
"bgColor": "#ffffff",
"showBorder": "0",
"showPlotBorder": "0",
"showValues": "0",
"showShadow": "0",
"showAlternateHGridColor": "0",
"showCanvasBorder": "0",
"showXAxisLine": "1",
"xAxisLineThickness": "1",
"xAxisLineColor": "#999999",
"canvasBgColor": "#ffffff",
"divlineAlpha": "100",
"divlineColor": "#999999",
"divlineThickness": "1",
"divLineIsDashed": "1",
"divLineDashLen": "1",
"divLineGapLen": "1",
"legendBorderAlpha": "0",
"legendShadow": "0",
"toolTipColor": "#ffffff",
"toolTipBorderThickness": "0",
"toolTipBgColor": "#000000",
"toolTipBgAlpha": "80",
"toolTipBorderRadius": "2",
"toolTipPadding": "5"
},
"categories": [
{
"category": [
{
"label": "Mon"
},
{
"label": "Tue"
},
{
"label": "Wed"
},
{
"vline": "true",
"lineposition": "0",
"color": "#6baa01",
"labelHAlign": "right",
"labelPosition": "0",
"label": "National holiday"
},
{
"label": "Thu"
},
{
"label": "Fri"
},
{
"label": "Sat"
},
{
"label": "Sun"
}
]
}
],
"dataset": [
{
"seriesname": "Garden Groove harbour",
"data": [
{
"value": "15123"
},
{
"value": "14233"
},
{
"value": "21507"
},
{
"value": "9110"
},
{
"value": "14829"
},
{
"value": "17503"
},
{
"value": "20202"
}
]
},
{
"seriesname": "Crompton-Rancho Dom",
"data": [
{
"value": "11400"
},
{
"value": "12800"
},
{
"value": "17800"
},
{
"value": "10400"
},
{
"value": "11800"
},
{
"value": "13100"
},
{
"value": "20800"
}
]
}
]
}Single-series Spline Area 2D Chart
A simple single-series spline area area 2D chart looks like this:
To render a single-series spline chart:
- Set the
typeattribute tosplinearea.
Spline and spline area charts do not support joining of empty data points in the chart. That means, if your chart does not contain data at a particular point, the data points cannot be connected to each other and will appear as a broken dataset.
There! You have now seen and understood the basics of spline charts and how the various types can be rendered.