Class LineChart

java.lang.Object

com.codename1.charts.views.AbstractChart

com.codename1.charts.views.XYChart

com.codename1.charts.views.LineChart

Direct Known Subclasses:

CubicLineChart, TimeChart

public class LineChart
extends XYChart

Plots series of X/Y points using straight line segments.

Supply the chart with an XYMultipleSeriesDataset and configure its appearance via an XYMultipleSeriesRenderer. The chart is commonly wrapped in a com.codename1.charts.ChartComponent before being added to a Codename One form.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	TYPE	The constant to identify this chart type.

Fields inherited from class XYChart

mDataset, mRenderer

Constructor Summary

Constructors

Constructor	Description
LineChart(XYMultipleSeriesDataset dataset, XYMultipleSeriesRenderer renderer)	Builds a new line chart instance.

Method Summary

Modifier and Type	Method	Description
protected ClickableArea[]	clickableAreasForPoints(List<Float> points, List<Double> values, float yAxisValue, int seriesIndex, int startIndex)	Returns the clickable areas for all passed points
void	drawLegendShape(Canvas canvas, SimpleSeriesRenderer renderer, float x, float y, int seriesIndex, Paint paint)	The graphical representation of the legend shape.
void	drawSeries(Canvas canvas, Paint paint, List<Float> points, XYSeriesRenderer renderer, float yAxisValue, int seriesIndex, int startIndex)	The graphical representation of a series.
String	getChartType()	Returns the chart type identifier.
int	getLegendShapeWidth(int seriesIndex)	Returns the legend shape width.
ScatterChart	getPointsChart()	Returns the scatter chart to be used for drawing the data points.
boolean	isRenderPoints(SimpleSeriesRenderer renderer)	Returns if the chart should display the points as a certain shape.
protected void	setDatasetRenderer(XYMultipleSeriesDataset dataset, XYMultipleSeriesRenderer renderer)	Sets the series and the renderer.

Methods inherited from class XYChart

draw, drawChartValuesText, drawPoints, drawSeries, drawText, drawXLabels, drawXTextLabels, drawYLabels, getCalcRange, getDataset, getDefaultMinimum, getRenderer, getScreenR, getSeriesAndPointForScreenCoordinate, getXLabels, getYLabels, isRenderNullValues, setCalcRange, setScreenR, toRealPoint, toRealPoint, toScreenPoint, toScreenPoint

Methods inherited from class AbstractChart

calculateDrawPoints, drawBackground, drawLabel, drawLegend, drawPath, drawPath, drawString, getExceed, getLabel, getLegendSize, isNullValue, isVertical

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

TYPE

public static final String TYPE

The constant to identify this chart type.

See Also:

• Constant Field Values

Constructor Details

LineChart

public LineChart(XYMultipleSeriesDataset dataset,
 XYMultipleSeriesRenderer renderer)

Builds a new line chart instance.

Parameters

• dataset: the multiple series dataset

• renderer: the multiple series renderer

Method Details

setDatasetRenderer

protected void setDatasetRenderer(XYMultipleSeriesDataset dataset,
 XYMultipleSeriesRenderer renderer)

Sets the series and the renderer.

Parameters

• dataset: the series dataset

• renderer: the series renderer

Overrides:

setDatasetRenderer in class XYChart

drawSeries

public void drawSeries(Canvas canvas,
 Paint paint,
 List<Float> points,
 XYSeriesRenderer renderer,
 float yAxisValue,
 int seriesIndex,
 int startIndex)

The graphical representation of a series.

Parameters

• canvas: the canvas to paint to

• paint: the paint to be used for drawing

• points: the array of points to be used for drawing the series

• seriesRenderer: the series renderer

• yAxisValue: the minimum value of the y axis

• seriesIndex: the index of the series currently being drawn

• startIndex: the start index of the rendering points

Specified by:

drawSeries in class XYChart

clickableAreasForPoints

protected ClickableArea[] clickableAreasForPoints(List<Float> points,
 List<Double> values,
 float yAxisValue,
 int seriesIndex,
 int startIndex)

Description copied from class: XYChart

Returns the clickable areas for all passed points

Parameters

• points: the array of points

• values: the array of values of each point

• yAxisValue: the minimum value of the y axis

• seriesIndex: the index of the series to which the points belong

• startIndex: the start index of the rendering points

Returns

an array of rectangles with the clickable area

Specified by:

clickableAreasForPoints in class XYChart

getLegendShapeWidth

public int getLegendShapeWidth(int seriesIndex)

Returns the legend shape width.

Parameters

• seriesIndex: the series index

Returns

the legend shape width

Specified by:

getLegendShapeWidth in class AbstractChart

drawLegendShape

public void drawLegendShape(Canvas canvas,
 SimpleSeriesRenderer renderer,
 float x,
 float y,
 int seriesIndex,
 Paint paint)

The graphical representation of the legend shape.

Parameters

• canvas: the canvas to paint to

• renderer: the series renderer

• x: the x value of the point the shape should be drawn at

• y: the y value of the point the shape should be drawn at

• seriesIndex: the series index

• paint: the paint to be used for drawing

Specified by:

drawLegendShape in class AbstractChart

isRenderPoints

public boolean isRenderPoints(SimpleSeriesRenderer renderer)

Returns if the chart should display the points as a certain shape.

Parameters

• renderer: the series renderer

Overrides:

isRenderPoints in class XYChart

getPointsChart

public ScatterChart getPointsChart()

Returns the scatter chart to be used for drawing the data points.

Returns

the data points scatter chart

Overrides:

getPointsChart in class XYChart

getChartType

public String getChartType()

Returns the chart type identifier.

Returns

the chart type

Specified by:

getChartType in class XYChart