LineChart

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Contents:

Optimal data structure (database):

Category Y-Axis X-Axis

customers

2013

4500

customers

2014

9500

Customers

2015

10850

…​

+

+

Sales

2013

1200

Sales

2014

8500

…​

+

+

Optimal object structure (Java):

public class LineChartObject {

    private String category;
    private String y_axis;
    private Integer x_axis;

    public String getCategory() {
        return this.category;
    }

    public void setCategory(final String category) {
        this.category = category;
    }

    public String getY_axis() {
        return this.y_axis;
    }

    public void setY_axis(final String y_axis) {
        this.y_axis = y_axis;
    }

    public Integer getX_axis() {
        return this.x_axis;
    }

    public void setX_axis(final Integer x_axis) {
        this.x_axis = x_axis;
    }
}

Example

// Create model
final ChartModel model = ChartModel.New()
    .addColumn(Column.New(Type.STRING, "year", "Jahr"))
    .addColumn(Column.New(Type.NUMBER, "sales", "Verkäufe"))
    .addColumn(Column.New(Type.NUMBER, "customer", "Kunden"));

// Add items to model
model.addRow("2013", "6500", 6500);
model.addRow("2014", "4321", 4321);
model.addRow("2015", "9460", 9460);
model.addRow("2016", "7450", 7450);

model.addRow("2013", "1500", 1500);
model.addRow("2014", "2850", 2850);
model.addRow("2015", "685", 685);
model.addRow("2016", "4850", 4850);

// Set model
lineChart.setModel(model);

API and methods

Properties

PointShape

The shape of each data element: "circle", "triangle", "square", "rhombus", "star" or "polygon".

lineChart.setPointShape(PointShape.New(PointShape.Type.CIRCLE));

You can find detailed information here: https://developers.google.com/chart/interactive/docs/points

PointSize

Diameter of the displayed points in pixels. Use zero to hide all points. You can override the values for individual series with the 'series' property. If you use a trendline, the pointSize option affects the width of the trendline unless you override it with the trendlines.n.pointsize option.

lineChart.setPointSize(5);

PointVisible

Determines whether points should be displayed. Set to "false" to hide all points.

lineChart.setPointsVisible(true);

LineDashStyle

The in-and-out pattern for dashed lines. For example, [4, 4] repeats 4 long dashes followed by 4 long gaps, and [5, 1, 3] repeats a 5 long dash, a 1 long gap, a 3 long dash, a 5 long gap, a 1 long dash, and a 3 long gap. See Dotted lines for more information.

lineChart.setLineDashStyle(Arrays.asList(4,4,4));

LineWidth

Data line width in pixels. Use zero to hide all lines and show only the points. Use the Series property to override the values for individual series.

lineChart.setLineWidth(5);

CurveType

Controls the curve of the lines when the line width is not zero. Can be one of the following values:

lineChart.setCurveType(CurveType.FUNCTION);

SelectionMode

If selectionMode is 'multiple', users can select multiple data points.

lineChart.setSelectionMode(SelectionMode.MULTIPLE);

Orientation

The orientation of the diagram. With the setting 'vertical' the axes of the chart are rotated, so that (for example) a column chart becomes a bar chart and an area chart grows to the right instead of upwards:

lineChart.setOrientation(Orientation.HORIZONTAL);

DataOpacity

The transparency of the data points, where 1.0 is completely opaque and 0.0 is completely transparent.

lineChart.setCurveType(CurveType.FUNCTION);