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/*
* A demo of an various Excel chart data label features that are available via
* a libxlsxwriter chart.
*
* Copyright 2014-2026, John McNamara, jmcnamara@cpan.org
*
*/
#include "xlsxwriter.h"
/*
* Create a worksheet with examples charts.
*/
int main() {
lxw_workbook *workbook = workbook_new("chart_data_labels.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);
format_set_bold(bold);
/* Some chart positioning options. */
lxw_chart_options options = {.x_offset = 25, .y_offset = 10};
/* Write some data for the chart. */
worksheet_write_string(worksheet, 0, 0, "Number", bold);
worksheet_write_number(worksheet, 1, 0, 2, NULL);
worksheet_write_number(worksheet, 2, 0, 3, NULL);
worksheet_write_number(worksheet, 3, 0, 4, NULL);
worksheet_write_number(worksheet, 4, 0, 5, NULL);
worksheet_write_number(worksheet, 5, 0, 6, NULL);
worksheet_write_number(worksheet, 6, 0, 7, NULL);
worksheet_write_string(worksheet, 0, 1, "Data", bold);
worksheet_write_number(worksheet, 1, 1, 20, NULL);
worksheet_write_number(worksheet, 2, 1, 10, NULL);
worksheet_write_number(worksheet, 3, 1, 20, NULL);
worksheet_write_number(worksheet, 4, 1, 30, NULL);
worksheet_write_number(worksheet, 5, 1, 40, NULL);
worksheet_write_number(worksheet, 6, 1, 30, NULL);
worksheet_write_string(worksheet, 0, 2, "Text", bold);
worksheet_write_string(worksheet, 1, 2, "Jan", NULL);
worksheet_write_string(worksheet, 2, 2, "Feb", NULL);
worksheet_write_string(worksheet, 3, 2, "Mar", NULL);
worksheet_write_string(worksheet, 4, 2, "Apr", NULL);
worksheet_write_string(worksheet, 5, 2, "May", NULL);
worksheet_write_string(worksheet, 6, 2, "Jun", NULL);
/*
* Chart 1. Example with standard data labels.
*/
lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
/* Add a chart title. */
chart_title_set_name(chart, "Chart with standard data labels");
/* Add a data series to the chart. */
lxw_chart_series *series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
"=Sheet1!$B$2:$B$7");
/* Add the series data labels. */
chart_series_set_labels(series);
/* Turn off the legend. */
chart_legend_set_position(chart, LXW_CHART_LEGEND_NONE);
/* Insert the chart into the worksheet. */
worksheet_insert_chart_opt(worksheet, CELL("D2"), chart, &options);
/*
* Chart 2. Example with value and category data labels.
*/
chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
/* Add a chart title. */
chart_title_set_name(chart, "Category and Value data labels");
/* Add a data series to the chart. */
series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
"=Sheet1!$B$2:$B$7");
/* Add the series data labels. */
chart_series_set_labels(series);
/* Turn on Value and Category labels. */
chart_series_set_labels_options(series, LXW_FALSE, LXW_TRUE, LXW_TRUE);
/* Turn off the legend. */
chart_legend_set_position(chart, LXW_CHART_LEGEND_NONE);
/* Insert the chart into the worksheet. */
worksheet_insert_chart_opt(worksheet, CELL("D18"), chart, &options);
/*
* Chart 3. Example with standard data labels with different font.
*/
chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
/* Add a chart title. */
chart_title_set_name(chart, "Data labels with user defined font");
/* Add a data series to the chart. */
series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
"=Sheet1!$B$2:$B$7");
/* Add the series data labels. */
chart_series_set_labels(series);
lxw_chart_font font1 = {.bold = LXW_TRUE, .color = LXW_COLOR_RED, .rotation = -30};
chart_series_set_labels_font(series, &font1);
/* Turn off the legend. */
chart_legend_set_position(chart, LXW_CHART_LEGEND_NONE);
/* Insert the chart into the worksheet. */
worksheet_insert_chart_opt(worksheet, CELL("D34"), chart, &options);
/*
* Chart 4. Example with standard data labels and formatting.
*/
chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
/* Add a chart title. */
chart_title_set_name(chart, "Data labels with formatting");
/* Add a data series to the chart. */
series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
"=Sheet1!$B$2:$B$7");
/* Add the series data labels. */
chart_series_set_labels(series);
/* Set the border/line and fill for the data labels. */
lxw_chart_line line1 = {.color = LXW_COLOR_RED};
lxw_chart_fill fill1 = {.color = LXW_COLOR_YELLOW};
chart_series_set_labels_line(series, &line1);
chart_series_set_labels_fill(series, &fill1);
/* Turn off the legend. */
chart_legend_set_position(chart, LXW_CHART_LEGEND_NONE);
/* Insert the chart into the worksheet. */
worksheet_insert_chart_opt(worksheet, CELL("D50"), chart, &options);
/*
* Chart 5.Example with custom string data labels.
*/
chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
/* Add a chart title. */
chart_title_set_name(chart, "Chart with custom string data labels");
/* Add a data series to the chart. */
series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
"=Sheet1!$B$2:$B$7");
/* Add the series data labels. */
chart_series_set_labels(series);
/* Create some custom labels. */
lxw_chart_data_label data_label5_1 = {.value = "Amy"};
lxw_chart_data_label data_label5_2 = {.value = "Bea"};
lxw_chart_data_label data_label5_3 = {.value = "Eva"};
lxw_chart_data_label data_label5_4 = {.value = "Fay"};
lxw_chart_data_label data_label5_5 = {.value = "Liv"};
lxw_chart_data_label data_label5_6 = {.value = "Una"};
/* Create an array of label pointers. NULL indicates the end of the array. */
lxw_chart_data_label *data_labels5[] = {
&data_label5_1,
&data_label5_2,
&data_label5_3,
&data_label5_4,
&data_label5_5,
&data_label5_6,
NULL
};
/* Set the custom labels. */
chart_series_set_labels_custom(series, data_labels5);
/* Turn off the legend. */
chart_legend_set_position(chart, LXW_CHART_LEGEND_NONE);
/* Insert the chart into the worksheet. */
worksheet_insert_chart_opt(worksheet, CELL("D66"), chart, &options);
/*
* Chart 6. Example with custom data labels from cells.
*/
chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
/* Add a chart title. */
chart_title_set_name(chart, "Chart with custom data labels from cells");
/* Add a data series to the chart. */
series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
"=Sheet1!$B$2:$B$7");
/* Add the series data labels. */
chart_series_set_labels(series);
/* Create some custom labels. */
lxw_chart_data_label data_label6_1 = {.value = "=Sheet1!$C$2"};
lxw_chart_data_label data_label6_2 = {.value = "=Sheet1!$C$3"};
lxw_chart_data_label data_label6_3 = {.value = "=Sheet1!$C$4"};
lxw_chart_data_label data_label6_4 = {.value = "=Sheet1!$C$5"};
lxw_chart_data_label data_label6_5 = {.value = "=Sheet1!$C$6"};
lxw_chart_data_label data_label6_6 = {.value = "=Sheet1!$C$7"};
/* Create an array of label pointers. NULL indicates the end of the array. */
lxw_chart_data_label *data_labels6[] = {
&data_label6_1,
&data_label6_2,
&data_label6_3,
&data_label6_4,
&data_label6_5,
&data_label6_6,
NULL
};
/* Set the custom labels. */
chart_series_set_labels_custom(series, data_labels6);
/* Turn off the legend. */
chart_legend_set_position(chart, LXW_CHART_LEGEND_NONE);
/* Insert the chart into the worksheet. */
worksheet_insert_chart_opt(worksheet, CELL("D82"), chart, &options);
/*
* Chart 7. Example with custom and default data labels.
*/
chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
/* Add a chart title. */
chart_title_set_name(chart, "Mixed custom and default data labels");
/* Add a data series to the chart. */
series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
"=Sheet1!$B$2:$B$7");
lxw_chart_font font2 = {.color = LXW_COLOR_RED};
/* Add the series data labels. */
chart_series_set_labels(series);
/* Create some custom labels. */
/* The following is used to get a mix of default and custom labels. The
* items initialized with '{0}' and items without a custom label (points 5
* and 6 which come after NULL) will get the default value. We also set a
* font for the custom items as an extra example.
*/
lxw_chart_data_label data_label7_1 = {.value = "=Sheet1!$C$2", .font = &font2};
lxw_chart_data_label data_label7_2 = {0};
lxw_chart_data_label data_label7_3 = {.value = "=Sheet1!$C$4", .font = &font2};
lxw_chart_data_label data_label7_4 = {.value = "=Sheet1!$C$5", .font = &font2};
/* Create an array of label pointers. NULL indicates the end of the array. */
lxw_chart_data_label *data_labels7[] = {
&data_label7_1,
&data_label7_2,
&data_label7_3,
&data_label7_4,
NULL
};
/* Set the custom labels. */
chart_series_set_labels_custom(series, data_labels7);
/* Turn off the legend. */
chart_legend_set_position(chart, LXW_CHART_LEGEND_NONE);
/* Insert the chart into the worksheet. */
worksheet_insert_chart_opt(worksheet, CELL("D98"), chart, &options);
/*
* Chart 8. Example with deleted/hidden custom data labels.
*/
chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
/* Add a chart title. */
chart_title_set_name(chart, "Chart with deleted data labels");
/* Add a data series to the chart. */
series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
"=Sheet1!$B$2:$B$7");
/* Add the series data labels. */
chart_series_set_labels(series);
/* Create some custom labels. */
lxw_chart_data_label hide = {.hide = LXW_TRUE};
lxw_chart_data_label keep = {.hide = LXW_FALSE};
/* An initialized struct like this would also work: */
/* lxw_chart_data_label keep = {0}; */
/* Create an array of label pointers. NULL indicates the end of the array. */
lxw_chart_data_label *data_labels8[] = {
&hide,
&keep,
&hide,
&hide,
&keep,
&hide,
NULL
};
/* Set the custom labels. */
chart_series_set_labels_custom(series, data_labels8);
/* Turn off the legend. */
chart_legend_set_position(chart, LXW_CHART_LEGEND_NONE);
/* Insert the chart into the worksheet. */
worksheet_insert_chart_opt(worksheet, CELL("D114"), chart, &options);
/*
* Chart 9.Example with custom string data labels and formatting.
*/
chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
/* Add a chart title. */
chart_title_set_name(chart, "Chart with custom labels and formatting");
/* Add a data series to the chart. */
series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
"=Sheet1!$B$2:$B$7");
/* Add the series data labels. */
chart_series_set_labels(series);
/* Set the border/line and fill for the data labels. */
lxw_chart_line line2 = {.color = LXW_COLOR_RED};
lxw_chart_fill fill2 = {.color = LXW_COLOR_YELLOW};
lxw_chart_line line3 = {.color = LXW_COLOR_BLUE};
lxw_chart_fill fill3 = {.color = LXW_COLOR_GREEN};
/* Create some custom labels. */
lxw_chart_data_label data_label9_1 = {.value = "Amy", .line = &line3};
lxw_chart_data_label data_label9_2 = {.value = "Bea"};
lxw_chart_data_label data_label9_3 = {.value = "Eva"};
lxw_chart_data_label data_label9_4 = {.value = "Fay"};
lxw_chart_data_label data_label9_5 = {.value = "Liv"};
lxw_chart_data_label data_label9_6 = {.value = "Una", .fill = &fill3};
/* Set the default formatting for the data labels in the series. */
chart_series_set_labels_line(series, &line2);
chart_series_set_labels_fill(series, &fill2);
/* Create an array of label pointers. NULL indicates the end of the array. */
lxw_chart_data_label *data_labels9[] = {
&data_label9_1,
&data_label9_2,
&data_label9_3,
&data_label9_4,
&data_label9_5,
&data_label9_6,
NULL
};
/* Set the custom labels. */
chart_series_set_labels_custom(series, data_labels9);
/* Turn off the legend. */
chart_legend_set_position(chart, LXW_CHART_LEGEND_NONE);
/* Insert the chart into the worksheet. */
worksheet_insert_chart_opt(worksheet, CELL("D130"), chart, &options);
return workbook_close(workbook);
}
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