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chart_doughnut.bas
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/'
* An example of creating an Excel doughnut chart using the libxlsxwriter library.
*
* The demo also shows how to set segment colors. It is possible to define
* chart colors for most types of libxlsxwriter charts via the series
* formatting functions. However, Pie/Doughnut charts are a special case since
* each segment is represented as a point so it is necessary to assign
* formatting to each point in the series.
*
* Copyright 2014-2017, John McNamara, [email protected]
*
* translated by Lee June by using https://github.com/retsyo/libxlsxwriter_freebasic
'/
#include "auto_xlsxwriter.bi"
/'
* Write some data to the worksheet.
'/
sub write_worksheet_data(byref worksheet as lxw_worksheet ptr, byref bold as lxw_format ptr)
worksheet_write_string(worksheet, CELL("A1"), "Category", bold)
worksheet_write_string(worksheet, CELL("A2"), "Glazed", NULL)
worksheet_write_string(worksheet, CELL("A3"), "Chocolate", NULL)
worksheet_write_string(worksheet, CELL("A4"), "Cream", NULL)
worksheet_write_string(worksheet, CELL("B1"), "Values", bold)
worksheet_write_number(worksheet, CELL("B2"), 50, NULL)
worksheet_write_number(worksheet, CELL("B3"), 35, NULL)
worksheet_write_number(worksheet, CELL("B4"), 15, NULL)
End Sub
/'
* Create a worksheet with examples charts.
*
'/
function main() as Integer
var workbook = new_workbook("chart_doughnut.xlsx")
var worksheet = workbook_add_worksheet(workbook, NULL)
/' Add a bold format to use to highlight the header cells. '/
var bold = workbook_add_format(workbook)
format_set_bold(bold)
/' Write some data for the chart. '/
write_worksheet_data(worksheet, bold)
/'
* Chart 1: Create a simple doughnut chart.
'/
var chart = workbook_add_chart(workbook, LXW_CHART_DOUGHNUT)
/' Add the first series to the chart. '/
var series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4")
/' Set the name for the series instead of the default "Series 1". '/
chart_series_set_name(series, "Doughnut sales data")
/' Add a chart title. '/
chart_title_set_name(chart, "Popular Doughnut Types")
/' Set an Excel chart style. '/
chart_set_style(chart, 10)
/' Insert the chart into the worksheet. '/
worksheet_insert_chart(worksheet, CELL("D2"), chart)
/'
* Chart 2: Create a doughnut chart with user defined segment colors.
'/
chart = workbook_add_chart(workbook, LXW_CHART_DOUGHNUT)
/' Add the first series to the chart. '/
series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4")
/' Set the name for the series instead of the default "Series 1". '/
chart_series_set_name(series, "Doughnut sales data")
/' Add a chart title. '/
chart_title_set_name(chart, "Doughnut Chart with user defined colors")
/' Add for fills for use in the chart. '/
Dim As lxw_chart_fill fill1
fill1.color = &HFA58D0
Dim As lxw_chart_fill fill2
fill2.color = &H61210B
Dim As lxw_chart_fill fill3
fill3.color = &HF5F6CE
/' Add some points with the above fills. '/
Dim As lxw_chart_point point1
point1.fill = @fill1
Dim As lxw_chart_point point2
point2.fill = @fill2
Dim As lxw_chart_point point3
point3.fill = @fill3
/' Create an array of the point objects. '/
Dim As lxw_chart_point ptr points(0 to 4) = {@point1, _
@point2, _
@point3, _
NULL}
/' Add/override the points/segments of the chart. '/
chart_series_set_points(series, @points(0))
/' Insert the chart into the worksheet. '/
worksheet_insert_chart(worksheet, CELL("D18"), chart)
/'
* Chart 3: Create a Doughnut chart with rotation of the segments.
'/
chart = workbook_add_chart(workbook, LXW_CHART_DOUGHNUT)
/' Add the first series to the chart. '/
series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4")
/' Set the name for the series instead of the default "Series 1". '/
chart_series_set_name(series, "Doughnut sales data")
/' Add a chart title. '/
chart_title_set_name(chart, "Doughnut Chart with segment rotation")
/' Change the angle/rotation of the first segment. '/
chart_set_rotation(chart, 90)
/' Insert the chart into the worksheet. '/
worksheet_insert_chart(worksheet, CELL("D34"), chart)
/'
* Chart 4: Create a Doughnut chart with user defined hole size and other
* options.
'/
chart = workbook_add_chart(workbook, LXW_CHART_DOUGHNUT)
/' Add the first series to the chart. '/
series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4")
/' Set the name for the series instead of the default "Series 1". '/
chart_series_set_name(series, "Doughnut sales data")
/' Add a chart title. '/
chart_title_set_name(chart, "Doughnut Chart with options applied.")
/' Add/override the points/segments defined in Chart 2. '/
chart_series_set_points(series, @points(0))
/' Set an Excel chart style. '/
chart_set_style(chart, 26)
/' Change the angle/rotation of the first segment. '/
chart_set_rotation(chart, 28)
/' Change the hole size. '/
chart_set_hole_size(chart, 33)
/' Insert the chart into the worksheet. '/
worksheet_insert_chart(worksheet, CELL("D50"), chart)
return workbook_close(workbook)
End Function
main()