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chart_radar.c
<< chart_scatter.c chart_pie.c >>

Example of creating Excel Radar charts. Three types of radar chart are shown.

The default radar chart:

chart_radar1.png

Radar chart with markers:

chart_radar2.png

Filled radar chart:

chart_radar3.png
/*
* An example of creating Excel radar charts using the libxlsxwriter library.
*
* Copyright 2014-2017, John McNamara, jmcnamara@cpan.org
*
*/
#include "xlsxwriter.h"
/*
* Write some data to the worksheet.
*/
void write_worksheet_data(lxw_worksheet *worksheet, lxw_format *bold) {
int row, col;
uint8_t data[6][3] = {
/* Three columns of data. */
{2, 30, 25},
{3, 60, 40},
{4, 70, 50},
{5, 50, 30},
{6, 40, 50},
{7, 30, 40}
};
worksheet_write_string(worksheet, CELL("A1"), "Number", bold);
worksheet_write_string(worksheet, CELL("B1"), "Batch 1", bold);
worksheet_write_string(worksheet, CELL("C1"), "Batch 2", bold);
for (row = 0; row < 6; row++)
for (col = 0; col < 3; col++)
worksheet_write_number(worksheet, row + 1, col, data[row][col] , NULL);
}
/*
* Create a worksheet with examples charts.
*/
int main() {
lxw_workbook *workbook = new_workbook("chart_radar.xlsx");
lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
/* Add a bold format to use to highlight the header cells. */
lxw_format *bold = workbook_add_format(workbook);
/* Write some data for the chart. */
write_worksheet_data(worksheet, bold);
/*
* Chart 1. Create a radar chart.
*/
/* Add the first series to the chart. */
series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
/* Set the name for the series instead of the default "Series 1". */
chart_series_set_name(series, "=Sheet1!$B1$1");
/* Add a second series but leave the categories and values undefined. They
* can be defined later using the alternative syntax shown below. */
series = chart_add_series(chart, NULL, NULL);
/* Configure the series using a syntax that is easier to define programmatically. */
chart_series_set_categories(series, "Sheet1", 1, 0, 6, 0); /* "=Sheet1!$A$2:$A$7" */
chart_series_set_values(series, "Sheet1", 1, 2, 6, 2); /* "=Sheet1!$C$2:$C$7" */
chart_series_set_name_range(series, "Sheet1", 0, 2); /* "=Sheet1!$C$1" */
/* Add a chart title and some axis labels. */
chart_title_set_name(chart, "Results of sample analysis");
chart_axis_set_name(chart->x_axis, "Test number");
chart_axis_set_name(chart->y_axis, "Sample length (mm)");
/* Set an Excel chart style. */
chart_set_style(chart, 11);
/* Insert the chart into the worksheet. */
worksheet_insert_chart(worksheet, CELL("E2"), chart);
/*
* Chart 2. Create a radar chart with markers.
*/
/* Add the first series to the chart. */
series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
/* Set the name for the series instead of the default "Series 1". */
chart_series_set_name(series, "=Sheet1!$B1$1");
/* Add the second series to the chart. */
series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
/* Set the name for the series instead of the default "Series 2". */
chart_series_set_name(series, "=Sheet1!$C1$1");
/* Add a chart title and some axis labels. */
chart_title_set_name(chart, "Results of sample analysis");
chart_axis_set_name(chart->x_axis, "Test number");
chart_axis_set_name(chart->y_axis, "Sample length (mm)");
/* Set an Excel chart style. */
chart_set_style(chart, 12);
/* Insert the chart into the worksheet. */
worksheet_insert_chart(worksheet, CELL("E18"), chart);
/*
* Chart 3. Create a filled radar chart.
*/
/* Add the first series to the chart. */
series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
/* Set the name for the series instead of the default "Series 1". */
chart_series_set_name(series, "=Sheet1!$B1$1");
/* Add the second series to the chart. */
series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
/* Set the name for the series instead of the default "Series 2". */
chart_series_set_name(series, "=Sheet1!$C1$1");
/* Add a chart title and some axis labels. */
chart_title_set_name(chart, "Results of sample analysis");
chart_axis_set_name(chart->x_axis, "Test number");
chart_axis_set_name(chart->y_axis, "Sample length (mm)");
/* Set an Excel chart style. */
chart_set_style(chart, 13);
/* Insert the chart into the worksheet. */
worksheet_insert_chart(worksheet, CELL("E34"), chart);
return workbook_close(workbook);
}