chart_area.c

<< chart.c

chart_bar.c >>

Example of creating Excel Area charts. Three types of area chart are shown.

The default area chart:

Stacked area chart:

Percent stacked area chart:

/*
 * An example of creating Excel area charts using the libxlsxwriter library.
 *
 * Copyright 2014-2024, 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, 40, 30},
        {3, 40, 25},
        {4, 50, 30},
        {5, 30, 10},
        {6, 25,  5},
        {7, 50, 10}
    };
 
    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  = workbook_new("chart_area.xlsx");
    lxw_worksheet    *worksheet = workbook_add_worksheet(workbook, NULL);
    lxw_chart_series *series;
 
    /* Add a bold format to use to highlight the header cells. */
    lxw_format *bold = workbook_add_format(workbook);
    format_set_bold(bold);
 
    /* Write some data for the chart. */
    write_worksheet_data(worksheet, bold);
 
 
    /*
     * Chart 1. Create a area chart.
     */
    lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_AREA);
 
    /* 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!$B$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 stacked area chart.
     */
    chart = workbook_add_chart(workbook, LXW_CHART_AREA_STACKED);
 
    /* 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!$B$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!$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, 12);
 
    /* Insert the chart into the worksheet. */
    worksheet_insert_chart(worksheet, CELL("E18"), chart);
 
 
    /*
     * Chart 3. Create a percent stacked area chart.
     */
    chart = workbook_add_chart(workbook, LXW_CHART_AREA_STACKED_PERCENT);
 
    /* 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!$B$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!$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, 13);
 
    /* Insert the chart into the worksheet. */
    worksheet_insert_chart(worksheet, CELL("E34"), chart);
 
 
    return workbook_close(workbook);
}