Histogram Sparkline

Histograms are used to represent the frequency distribution of a data set. SpreadJS allows you to create histogram sparklines by using the histogram sparkline function.

The above image shows a histogram sparkline and its elements:

Bin: The data container which contains data of the specified range of values.
Bar: The paint block responsible for UI. The bar height is determined by the following expression if the paintLabel option is true:

(cellRowHeight - labelFontSize - 6px)

Otherwise, it is determined by:
(cellRowHeight - 6px)
Edge: Border of the bar.
- If the font size is more than the expression, then the largest integer less than or equal to the expression is taken as the font size.
- If the height of the cell is less than the cell row height, the font size is 12px.
Data Label: The data range displayed in the sparkline. The data label font size is determined by the expression:
Math.floor(cellRowHeight/3)
- If the font size is more than the expression, then the largest integer less than or equal to the expression is taken as the font size.
- If the height of the cell is less than the cell row height, the font size is 12px.

Types of Histogram Sparklines

The Histogram sparklines can be displayed discretely or continuously as shown below:

A discrete Histogram represents the data discretely (without continuous intervals) by taking existing values. For example: 20, 34, 38. The values are painted in ascending order.

A continuous Histogram represents the data by taking a range of continuous values. The intervals for the first bin are left-closed and right-closed, whereas the intervals for the rest of the bins are left-open and right-closed.

The lower bound is calculated using:

Math.floor(minValue/scale)*scale

Whereas the upper bound is calculated using:

Math.ceil(maxValue/scale)*scale
The width of the bin is 1, by default
If the scale is lower than 0, the sparkline is set to 1

The type of histogram can be specified by using the continuous option in the HistogramSparkline formula. The histogram sparkline formula has the following options where only 'dataRange' is the required argument:

Option	Description
dataRange	Specifies the range of data sources. It supports a range. It supports calc array and calc reference.
continuous	If set to true, the sparkline is a continuous histogram. If set to false, the sparkline is a discrete histogram. The default value is true.
paintLabel	If set to true, the sparkline paints the data label. The default value is false.
scale	Specifies the bin width. This value is useful when the histogram type is continuous. The default value is false.
barWidth	Specifies the bar width. The default value is 1. Bar width = auto calc width * barWidth Value range is 0 < value ≤ 1.
barColor	Specifies the color of the bar. Default value is '5B9BD5'. Supports CSS color property.
labelFontStyle	Specifies the font style of the data label font. The default value is 9pt Calibri. Supports CSS font property. It supports font-style, font-weight, font-size, font-family.
labelColor	Specifies the font color of the data label font. Default is black (#00000). Supports CSS color string.
edgeColor	Specifies the color of the edge. Default value is silver (#C0C0C0). Supports CSS color property.

The histogram sparkline formula has the following syntax:

=HISTOGRAMSPARKLINE(dataRange,continuous?,paintLabel?,scale?,barWidth?,barColor?,labelFontStyle?,labelColor,edgeColor?)

Notes

The default padding of sparkline is 3px.
The paintLabel option does not paint the data label when the custom font size is more than one-third of cell row height.
The data label does not paint when any of the data label's width is bigger than the bar's average width. The average width is determined by the expression (cell width/bar count).
For example, for 100px cell width, there are 5 bars in the sparkline. The bar average width is 20px. In this sparkline, if any data label is wider than 20px, the data label does not paint.
In the data range, any non-number type value is ignored.

Usage Scenario

Consider a scenario where an organization has conducted a survey of social media consumption by users every week. The histogram sparkline can depict these statistics and analyze the trends in how much time users spent on different social media platforms.

// initializing Spread
var spread = new GC.Spread.Sheets.Workbook(document.getElementById('ss'), { sheetCount: 1 });
spread.suspendPaint();
// get the sheets
var sheet1 = spread.sheets[0];
// set sheetAreaOffset option
sheet1.options.sheetAreaOffset = { left: 1, top: 1 };
// Hide gridlines
sheet1.options.gridline = { showVerticalGridline: false, showHorizontalGridline: false };
// Hide row/ col headers
sheet1.options.colHeaderVisible = false;
sheet1.options.rowHeaderVisible = false;
// set column width
for (var i = 1; i < 5; i++)
    sheet1.setColumnWidth(i, 265);
sheet1.setColumnWidth(0, 140);
// set row height
sheet1.setRowHeight(0, 35, GC.Spread.Sheets.SheetArea.dataArea)
sheet1.setRowHeight(1, 35, GC.Spread.Sheets.SheetArea.dataArea)
sheet1.setRowHeight(2, 200, GC.Spread.Sheets.SheetArea.dataArea)
var dataArray =
[
    ["Name", "Facebook", "Instagram", "LinkedIn", "Twitter"]
];
var dataArray1 =
[
    ["John Mathew", 71, 74, 97, 85],
    ["Jim Parker", 76, 58, 88, 84],
    ["Sophia Ran", 97, 80, 74, 80],
    ["Wendi Blake", 55, 97, 84, 60],
    ["Stephan Lai", 81, 83, 94, 90],
    ["Fay Van Damme", 71, 78, 72, 82],
    ["Brevin Dice", 84, 80, 83, 93],
    ["Regina Oleveria", 86, 76, 56, 92],
    ["Georgi Facello", 78, 61, 91, 68],
    ["Bezalel Simmel", 85, 58, 92, 68],
    ["Sachin Tsukuda", 76, 70, 55, 81],
    ["Patricia Breugel", 64, 77, 83, 85],
    ["Zito Baaz", 82, 97, 66, 90],
    ["Navin Argence", 59, 87, 83, 85],
    ["Siamak Salverda", 77, 85, 97, 65],
    ["Khaled Kohling", 87, 67, 77, 97],
    ["Bangqing Kleiser", 49, 97, 78, 75],
    ["Rimli Dusink", 25, 61, 91, 91],
    ["Nathan Ranta", 65, 60, 96, 92],
    ["Gila Lukaszewicz", 27, 91, 62, 93],
    ["Kaijung Rodham", 31, 81, 67, 87],
    ["Mohammed Pleszkun", 20, 98, 67, 82],
    ["Shuichi Piazza", 67, 56, 81, 82],
    ["Katsuo Leuchs", 83, 74, 51, 42],
    ["Masanao Ducloy", 67, 64, 58, 73],
    ["Mihalis Crabtree", 80, 91, 57, 84],
    ["Danny Lenart", 92, 38, 99, 86],
    ["Yongqiao Dalton", 85, 61, 73, 81],
    ["Gaetan Veldwijk", 64, 52, 76, 72],
    ["Leszek Pulkowski", 95, 75, 64, 99],
    ["Weidon Gente", 77, 88, 77, 96],
    ["Krister Stranks", 72, 38, 89, 55],
    ["Ziyad Baaz", 89, 81, 83, 48],
    ["Ymte Perelgut", 67, 70, 97, 94],
    ["Tonia Butner", 99, 71, 87, 76],
    ["Shigeaki Narlikar", 78, 80, 80, 97],
    ["Ayakannu Beerel", 86, 61, 85, 81],
    ["Moni Bale", 60, 72, 71, 86],
    ["Manohar Heemskerk", 97, 60, 75, 78],
    ["Angus Swan", 33, 97, 99, 99],
    ["Christ Murtagh", 91, 76, 73, 80],
    ["Hilary Rodiger", 75, 64, 84, 54],
    ["Maren Baez", 45, 77, 86, 88],
    ["Greger Jahnichen", 98, 89, 81, 63],
    ["Ymte Duclos", 95, 83, 72, 72],
    ["Chenyi Hainaut", 81, 97, 99, 87],
    ["Kasidit Picel", 87, 80, 88, 80],
    ["Elrique Walstra", 96, 54, 38, 54],
    ["Adel Reghbati", 56, 88, 81, 88]
];

// set data
sheet1.setArray(1, 0, dataArray);
sheet1.setArray(3, 0, dataArray1);
sheet1.setValue(0, 0, "Social media usage of users (in minutes)", GC.Spread.Sheets.SheetArea.dataArea);
// set alignment
sheet1.getRange(-1, 0, -1, 10).hAlign(GC.Spread.Sheets.HorizontalAlign.center);
sheet1.addSpan(0, 0, 1, 5, GC.Spread.Sheets.SheetArea.dataArea);
            
// Set HistogramSparkline formulas
sheet1.setFormula(2, 1, 'HISTOGRAMSPARKLINE(Sheet1!B4: B52, true, true, 20, 1, "#DC4463", "bold normal 10pt Calibri", "black")');
sheet1.setFormula(2, 2, 'HISTOGRAMSPARKLINE(Sheet1!C4: C52, true, true, 20, 1, "#FFAE49", "bold normal 10pt Calibri", "black")');
sheet1.setFormula(2, 3, 'HISTOGRAMSPARKLINE(Sheet1!D4: D52, true, true, 20, 1, "#5AB4BD", "bold normal 10pt Calibri", "black")');
sheet1.setFormula(2, 4, 'HISTOGRAMSPARKLINE(Sheet1!E4: E52, true, true, 20, 1, "#C2EDB2", "bold normal 10pt Calibri", "black")');
            
// set style for Row 0
var style1 = new GC.Spread.Sheets.Style();
style1.font = "bold 24px Calibri";
style1.foreColor = "black";
style1.backColor = "#9FD5B7";
style1.hAlign = GC.Spread.Sheets.HorizontalAlign.center;
style1.vAlign = GC.Spread.Sheets.VerticalAlign.center;
sheet1.setStyle(0, 0, style1, GC.Spread.Sheets.SheetArea.dataArea);

// set style for Row 1
var style = new GC.Spread.Sheets.Style();
style.font = "bold italic 20px Calibri";
style.foreColor = "black";
style.backColor = "#D3F0E0";
style.hAlign = GC.Spread.Sheets.HorizontalAlign.center;
style.vAlign = GC.Spread.Sheets.VerticalAlign.center;
for (var i = 0; i < 5; i++) {
    sheet1.setStyle(1, i, style, GC.Spread.Sheets.SheetArea.dataArea);
}
// set style for Row 2
var style2 = new GC.Spread.Sheets.Style();
style2.backColor = "#EDFDF4";
for (var i = 0; i < 5; i++)
    sheet1.setStyle(2, i, style2, GC.Spread.Sheets.SheetArea.dataArea);

// set border for dataArea cells
sheet1.getRange("A4:E52").setBorder(
    new GC.Spread.Sheets.LineBorder("black", GC.Spread.Sheets.LineStyle.thick),
    { top: true, bottom: true, left: true, right: true }, GC.Spread.Sheets.SheetArea.dataArea);

spread.resumePaint();