Android에서 프레젠테이션의 차트 데이터 시리즈 관리

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Android에서 프레젠테이션의 차트 시리즈, 데이터 포인트, 워크북 셀, 형식 지정, 겹침, 간격 너비 및 음수 값을 관리하는 방법을 배웁니다.

개요

A chart stores its plotted data in a chart data workbook. An IChartSeries represents one set of related values, and each IChartDataPoint in the series refers to one or more workbook cells. IChartCategory objects provide the labels or grouping values shared by the series. The series name, categories, and point values are therefore connected to IChartDataCell objects rather than stored only as display text.

For a typical category chart, the default workbook uses row 0 for series names, column 0 for category names, and the remaining cells for series values. Worksheet, row, and column indexes passed to IChartDataWorkbook.getCell are zero-based. This layout is useful when you create a chart with default data, but do not assume that every existing chart uses it. For a loaded presentation, inspect the cells referenced by the series, categories, and data points before changing workbook values.

Chart settings have three different scopes:

• Series-level settings, such as IChartSeries.getFormat, provide the default appearance for all points in one series.
• Data-point settings, such as IChartDataPoint.getFormat, override the series appearance for one point.
• Group settings apply to compatible series that belong to the same IChartSeriesGroup. Access the group through IChartSeries.getParentSeriesGroup when you need to set options such as overlap or gap width.

When no explicit point or series fill is set, the chart style and theme determine the automatic appearance. When both series and point formatting are present, the point formatting takes precedence for that point.

차트 시리즈 겹침 설정

IChartSeries.getOverlap reports how much bars or columns overlap in a 2D chart, from -100 through 100 percent. It is a read-only projection of the setting on the parent series group. Use IChartSeriesGroup.setOverlap to update every compatible series in that group. This option applies to chart types that display grouped bars or columns; it does not affect unrelated series groups in a combination chart.

The following example sets the overlap for the group that contains the first series:

import com.aspose.slides.*;

final int firstSlideIndex = 0;
final int firstSeriesIndex = 0;
final byte overlapPercent = 30;

Presentation presentation = new Presentation();
try {
    ISlide slide = presentation.getSlides().get_Item(firstSlideIndex);

    // 새 차트에는 샘플 시리즈, 카테고리 및 값이 포함됩니다.
    IChart chart = slide.getShapes().addChart(ChartType.ClusteredColumn, 20, 20, 500, 200);

    IChartSeries series = chart.getChartData().getSeries().get_Item(firstSeriesIndex);
    series.getParentSeriesGroup().setOverlap(overlapPercent);

    presentation.save("series_overlap.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

시리즈 채우기 색상 변경

Use IChartSeries.getFormat to set the default fill for an entire series. If a point already has an explicit fill, its IChartDataPoint.getFormat setting overrides the series fill for that point.

The following example applies a solid blue fill to the first series:

import com.aspose.slides.*;
import android.graphics.Color;

final int firstSlideIndex = 0;
final int firstSeriesIndex = 0;

Presentation presentation = new Presentation();
try {
    ISlide slide = presentation.getSlides().get_Item(firstSlideIndex);

    IChart chart = slide.getShapes().addChart(ChartType.ClusteredColumn, 20, 20, 500, 200);

    IChartSeries series = chart.getChartData().getSeries().get_Item(firstSeriesIndex);
    series.getFormat().getFill().setFillType(FillType.Solid);
    series.getFormat().getFill().getSolidFillColor().setColor(Color.BLUE);

    presentation.save("series_color.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

시리즈 이름 변경

A series name is stored in the chart data workbook and is normally displayed in the legend. In the default workbook created for a clustered column chart, cell B1 is at row 0, column 1 and contains the name of the first series. The named constants in the following example make that structure explicit:

import com.aspose.slides.*;

final int firstSlideIndex = 0;
final int worksheetIndex = 0;
final int seriesNameRowIndex = 0;
final int firstSeriesColumnIndex = 1;

Presentation presentation = new Presentation();
try {
    ISlide slide = presentation.getSlides().get_Item(firstSlideIndex);

    IChart chart = slide.getShapes().addChart(ChartType.ClusteredColumn, 20, 20, 500, 200);

    IChartDataWorkbook workbook = chart.getChartData().getChartDataWorkbook();
    IChartDataCell seriesNameCell = workbook.getCell(worksheetIndex, seriesNameRowIndex, firstSeriesColumnIndex);
    seriesNameCell.setValue("Revenue");

    presentation.save("series_name.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

You can also update the cell already referenced by IChartSeries.getName. This approach avoids assuming a particular row and column in an existing chart:

import com.aspose.slides.*;

final int firstSlideIndex = 0;
final int firstSeriesIndex = 0;
final int firstNameCellIndex = 0;

Presentation presentation = new Presentation();
try {
    ISlide slide = presentation.getSlides().get_Item(firstSlideIndex);

    IChart chart = slide.getShapes().addChart(ChartType.ClusteredColumn, 20, 20, 500, 200);

    IChartSeries series = chart.getChartData().getSeries().get_Item(firstSeriesIndex);
    IChartDataCell seriesNameCell = series.getName().getAsCells().get_Item(firstNameCellIndex);
    seriesNameCell.setValue("Revenue");

    presentation.save("series_name.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

여러 셀에서 이름을 가져와 시리즈 만들기

A composite series name is useful when a product name and a reporting period are stored in separate workbook cells. For example, you can combine Product A in B1 and 2026 in C1 into a single series name while keeping both parts linked to their source cells.

Use IChartDataWorkbook.getCellCollection to retrieve the name range, then pass that collection to IChartSeriesCollection.add. The skipHiddenCells argument controls whether hidden cells are included: true excludes them, while false includes them. This example uses false to include every cell in the name range.

The following example creates a presentation with one series and two data points. Cells B1:C1 supply only the series name; A2:A3 supply the category labels, and B2:B3 supply the numeric values.

import com.aspose.slides.*;

Presentation presentation = new Presentation();
try {
    ISlide slide = presentation.getSlides().get_Item(0);

    IChart chart = slide.getShapes().addChart(ChartType.ClusteredColumn, 50, 50, 620, 180);

    chart.getChartData().getSeries().clear();
    chart.getChartData().getCategories().clear();
    chart.setLegend(true);

    IChartDataWorkbook workbook = chart.getChartData().getChartDataWorkbook();
    workbook.clear(0);

    // 이 두 셀은 시리즈 이름을 제공합니다.
    workbook.getCell(0, 0, 1, "Product A");
    workbook.getCell(0, 0, 2, "2026");
    IChartCellCollection nameCells = workbook.getCellCollection("Sheet1!$B$1:$C$1", false);
    IChartSeries series = chart.getChartData().getSeries().add(nameCells, ChartType.ClusteredColumn);

    // 별도의 셀은 카테고리와 숫자 데이터 포인트를 제공합니다.
    IChartDataCell northCategory = workbook.getCell(0, 1, 0, "North");
    IChartDataCell southCategory = workbook.getCell(0, 2, 0, "South");
    chart.getChartData().getCategories().add(northCategory);
    chart.getChartData().getCategories().add(southCategory);
    IChartDataCell northValue = workbook.getCell(0, 1, 1, 120);
    IChartDataCell southValue = workbook.getCell(0, 2, 1, 150);
    series.getDataPoints().addDataPointForBarSeries(northValue);
    series.getDataPoints().addDataPointForBarSeries(southValue);

    presentation.save("composite_series_name.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The resulting series name is Product A 2026, with a space between the two cell values. The legend displays this as one entry for both columns. The image below illustrates the result:

자동 시리즈 채우기 색상 가져오기

IChartSeries.getAutomaticSeriesColor returns the color calculated from the series index and the chart style as an Android ARGB color integer. This is the color used when the series fill has not been explicitly defined. Calling the method reads the calculated color; it does not assign a new fill.

The following example prints the automatic color integer of each default series:

import com.aspose.slides.*;

final int firstSlideIndex = 0;

Presentation presentation = new Presentation();
try {
    ISlide slide = presentation.getSlides().get_Item(firstSlideIndex);

    IChart chart = slide.getShapes().addChart(ChartType.ClusteredColumn, 20, 20, 500, 200);

    int seriesCount = chart.getChartData().getSeries().size();
    for (int seriesIndex = 0; seriesIndex < seriesCount; seriesIndex++) {
        IChartSeries series = chart.getChartData().getSeries().get_Item(seriesIndex);
        int automaticColor = series.getAutomaticSeriesColor();
        System.out.println("Series " + seriesIndex + ": " + automaticColor);
    }
} finally {
    presentation.dispose();
}

The exact integer values depend on the chart style and theme.

차트 시리즈에 대한 반전 채우기 색상 설정

For bar, column, and bubble series, IChartSeries.setInvertIfNegative can display negative values with a different fill. Set the regular series fill to solid, enable inversion, and assign the negative-value color through IChartSeries.getInvertedSolidFillColor. Negative numbers remain unchanged in the workbook; only their display color changes.

The following example replaces the default chart data with one series. Worksheet row 0 contains the series name, column 0 contains category names, and column 1 contains the values:

import com.aspose.slides.*;
import android.graphics.Color;

final int firstSlideIndex = 0;
final int worksheetIndex = 0;
final int headerRowIndex = 0;
final int categoryColumnIndex = 0;
final int firstSeriesColumnIndex = 1;
final int firstDataRowIndex = 1;

String[] categoryNames = { "Category 1", "Category 2", "Category 3" };
int[] seriesValues = { -20, 50, -30 };

Presentation presentation = new Presentation();
try {
    ISlide slide = presentation.getSlides().get_Item(firstSlideIndex);

    IChart chart = slide.getShapes().addChart(ChartType.ClusteredColumn, 20, 20, 500, 200);
    IChartData chartData = chart.getChartData();
    IChartDataWorkbook workbook = chartData.getChartDataWorkbook();

    chartData.getSeries().clear();
    chartData.getCategories().clear();

    IChartDataCell seriesNameCell = workbook.getCell(worksheetIndex, headerRowIndex, firstSeriesColumnIndex, "Series 1");
    int chartType = chart.getType();
    IChartSeries series = chartData.getSeries().add(seriesNameCell, chartType);

    for (int categoryIndex = 0; categoryIndex < categoryNames.length; categoryIndex++) {
        int dataRowIndex = firstDataRowIndex + categoryIndex;
        String categoryName = categoryNames[categoryIndex];
        int seriesValue = seriesValues[categoryIndex];

        IChartDataCell categoryCell = workbook.getCell(worksheetIndex, dataRowIndex, categoryColumnIndex, categoryName);
        chartData.getCategories().add(categoryCell);

        IChartDataCell valueCell = workbook.getCell(worksheetIndex, dataRowIndex, firstSeriesColumnIndex, seriesValue);
        series.getDataPoints().addDataPointForBarSeries(valueCell);
    }

    int automaticSeriesColor = series.getAutomaticSeriesColor();
    series.getFormat().getFill().setFillType(FillType.Solid);
    series.getFormat().getFill().getSolidFillColor().setColor(automaticSeriesColor);
    series.setInvertIfNegative(true);
    series.getInvertedSolidFillColor().setColor(Color.RED);

    presentation.save("inverted_solid_fill_color.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

You can enable inversion for one point through IChartDataPoint.setInvertIfNegative. In the following example, inversion is disabled for the series and enabled only for the selected point. The point is also assigned a negative value so that the effect is visible:

import com.aspose.slides.*;
import android.graphics.Color;

final int firstSlideIndex = 0;
final int firstSeriesIndex = 0;
final int targetDataPointIndex = 2;
final int negativeValue = -30;

Presentation presentation = new Presentation();
try {
    ISlide slide = presentation.getSlides().get_Item(firstSlideIndex);

    IChart chart = slide.getShapes().addChart(ChartType.ClusteredColumn, 20, 20, 500, 200);

    IChartSeries series = chart.getChartData().getSeries().get_Item(firstSeriesIndex);
    int automaticSeriesColor = series.getAutomaticSeriesColor();
    series.getFormat().getFill().setFillType(FillType.Solid);
    series.getFormat().getFill().getSolidFillColor().setColor(automaticSeriesColor);
    series.getInvertedSolidFillColor().setColor(Color.RED);
    series.setInvertIfNegative(false);

    IChartDataPoint dataPoint = series.getDataPoints().get_Item(targetDataPointIndex);
    dataPoint.getValue().getAsCell().setValue(negativeValue);
    dataPoint.setInvertIfNegative(true);

    presentation.save("data_point_invert_color_if_negative.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

특정 데이터 포인트 값 삭제

To make one point empty without removing the other points, set its backing workbook cell to null. For a column chart, the plotted value is available through IChartDataPoint.getValue. The data point stays at the same category position, but the chart treats its value as blank according to the chart’s blank-value settings.

The following example clears only the second point in the first series:

import com.aspose.slides.*;

final int firstSlideIndex = 0;
final int firstSeriesIndex = 0;
final int targetDataPointIndex = 1;

Presentation presentation = new Presentation();
try {
    ISlide slide = presentation.getSlides().get_Item(firstSlideIndex);

    IChart chart = slide.getShapes().addChart(ChartType.ClusteredColumn, 20, 20, 500, 200);

    IChartSeries series = chart.getChartData().getSeries().get_Item(firstSeriesIndex);
    IChartDataPoint dataPoint = series.getDataPoints().get_Item(targetDataPointIndex);
    dataPoint.getValue().getAsCell().setValue(null);

    presentation.save("clear_data_point_value.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

Scatter charts use separate X and Y cells, and bubble charts also use a size cell. Clear only the cell that represents the value you intend to remove. Do not call IChartDataPointCollection.clear when you want to keep the other points, because that method removes every data point from the collection.

빈 셀 표시 제어

Hidden cells that contain values are a separate case from empty cells. To include or exclude data from hidden worksheet rows and columns, see Include Data from Hidden Rows and Columns.

An empty workbook cell represents missing data; a cell containing 0 represents a known numeric value. Call IChartDataCell.setValue with null to make a cell empty. A numeric zero remains a zero regardless of the blank-cell setting.

Use IChart.setDisplayBlanksAs to choose how the chart displays empty cells. This setting applies to the whole chart. It changes how blanks are plotted, without filling the empty workbook cell with zero or an interpolated value.

The following self-contained example creates a line chart with one series, clears the value for Day 3, and saves the same chart with each mode. No input file is required. The IChartDataWorkbook uses worksheet 0, column 0 for category labels, and column 1 for values; row 0 holds the series name. The final data is 10, 20, empty, 30, 40.

import com.aspose.slides.*;

Presentation presentation = new Presentation();
try {
    ISlide slide = presentation.getSlides().get_Item(0);

    IChart chart = slide.getShapes().addChart(ChartType.LineWithMarkers, 40, 40, 640, 400);
    IChartData chartData = chart.getChartData();
    IChartDataWorkbook workbook = chartData.getChartDataWorkbook();

    chartData.getSeries().clear();
    chartData.getCategories().clear();

    IChartDataCell seriesNameCell = workbook.getCell(0, 0, 1, "Measurements");
    IChartSeries series = chartData.getSeries().add(seriesNameCell, chart.getType());
    int[] values = { 10, 20, 25, 30, 40 };

    for (int i = 0; i < values.length; i++) {
        IChartDataCell categoryCell = workbook.getCell(0, i + 1, 0, "Day " + (i + 1));
        chartData.getCategories().add(categoryCell);
        IChartDataCell valueCell = workbook.getCell(0, i + 1, 1, values[i]);
        series.getDataPoints().addDataPointForLineSeries(valueCell);
    }

    // Day 3을 실제로 비워 두고, 카테고리와 데이터 포인트는 그대로 유지합니다.
    workbook.getCell(0, 3, 1).setValue(null);

    int[] modes = { DisplayBlanksAsType.Gap, DisplayBlanksAsType.Zero, DisplayBlanksAsType.Span };
    String[] modeNames = { "Gap", "Zero", "Span" };
    for (int i = 0; i < modes.length; i++) {
        chart.setDisplayBlanksAs(modes[i]);
        presentation.save("empty_cells_" + modeNames[i] + ".pptx", SaveFormat.Pptx);
    }
} finally {
    presentation.dispose();
}

Each output file stores the mode assigned before saving: empty_cells_Gap.pptx, empty_cells_Zero.pptx, and empty_cells_Span.pptx. To save only one version, assign the desired mode and save the presentation once instead of iterating over the modes.

The comparison below shows the same data in all three files. Day 3 is empty in the workbook in every case:

The visible effect depends on the chart type. A line chart makes all three modes easy to compare. Bar and column charts have no line to connect across a missing category, so Span cannot produce the connecting segment shown above; a missing column and a zero-height column can also look alike. Similarly, a scatter chart with markers only has no connecting line. Do not expect three distinct results for every chart type; check the output for the type you use.

시리즈 간격 너비 설정

Gap width is the space between adjacent bar or column clusters, expressed as a percentage of the bar or column width. Like overlap, it belongs to the parent series group rather than to one series. Call IChartSeriesGroup.setGapWidth once for the group. A larger value creates more space between clusters; a smaller value makes them denser.

The following example changes the gap width and saves only the final presentation:

import com.aspose.slides.*;

final int firstSlideIndex = 0;
final int firstSeriesIndex = 0;
final int gapWidthPercent = 30;

Presentation presentation = new Presentation();
try {
    ISlide slide = presentation.getSlides().get_Item(firstSlideIndex);

    IChart chart = slide.getShapes().addChart(ChartType.StackedColumn, 20, 20, 500, 200);

    IChartSeries series = chart.getChartData().getSeries().get_Item(firstSeriesIndex);
    series.getParentSeriesGroup().setGapWidth(gapWidthPercent);

    presentation.save("gap_width_30.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

FAQ

Which chart types support data series?

All chart types represented by the ChartType enumeration use chart data, but their series do not all have the same value structure or settings. For example, category charts use categories and values, scatter charts use X and Y values, and bubble charts add bubble sizes. Use the data-point creation method that matches the series type. Options such as overlap and gap width apply only to compatible bar or column groups.

What is a chart series group?

An IChartSeriesGroup contains compatible series that share group-level plotting settings. A combination chart can contain more than one group, so changing the group reached through one series does not necessarily change every series in the chart.

Does a newly created chart contain default data?

Yes. By default, IShapeCollection.addChart creates sample series, categories, and values. You can edit those cells or clear both the series and category collections before adding a completely custom data set. An overload can also create a chart without default data.

How are chart objects connected to workbook cells?

Series names, category labels, and data-point values reference cells in an IChartDataWorkbook. Changing a referenced cell updates the corresponding chart element. When you build custom data, keep category rows and series-value rows aligned so that each point is plotted under the intended category.

How do I clear one point instead of the whole series?

Set the relevant value cell to null to retain the point’s category position as an empty point. Use IChartDataPointCollection.clear only when you intend to remove all points from that series. If you also remove categories, update every series so their values remain aligned with the category collection.

How are empty points displayed?

The result depends on the chart type and the value configured through IChart.setDisplayBlanksAs. Supported charts can display blanks as gaps, as zero values, or by connecting neighboring points. Choose the setting that matches the meaning of missing data in your presentation. See Control the Display of Empty Cells for a complete example and visual comparison.

How are negative values formatted?

For supported bar, column, and bubble series, call IChartSeries.setInvertIfNegative and set the color returned by IChartSeries.getInvertedSolidFillColor. You can override the behavior for an individual point with IChartDataPoint.setInvertIfNegative. These methods affect formatting, not the stored numeric values.

Which formatting wins when both a series and a point are formatted?

Explicit data-point formatting takes precedence for that point. Other points continue to use the explicit series format or, when the series format is not defined, the automatic chart style and theme. Group settings such as overlap and gap width control layout and are not point-level formatting overrides.

Is there a limit to how many series a chart can contain?

Aspose.Slides does not impose a separate fixed series-count limit. In practice, presentation file constraints, available memory, rendering time, and chart readability determine a useful limit.

What should I change when columns are too close together or too far apart?

Call IChartSeriesGroup.setGapWidth on the appropriate parent series group. Increase the value to widen the space between clusters, or decrease it to bring the clusters closer together.