Class CubicLineChart

java.lang.Object

com.codename1.charts.views.AbstractChart

com.codename1.charts.views.XYChart

com.codename1.charts.views.LineChart

com.codename1.charts.views.CubicLineChart

public class CubicLineChart
extends LineChart

Draws smooth curves through XY series values using cubic interpolation.

Use this chart when you want to emphasise the trend between points rather than the raw straight-line segments of LineChart. Supply the XYMultipleSeriesDataset and XYMultipleSeriesRenderer as usual and pass an optional smoothness factor to control how tightly the curve follows the provided data points.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	TYPE	The chart type.

Fields inherited from class XYChart

mDataset, mRenderer

Modifier and Type	Field	Description
protected XYMultipleSeriesDataset	mDataset	The multiple series dataset.
protected XYMultipleSeriesRenderer	mRenderer	The multiple series renderer.

Constructor Summary

Constructors

Constructor	Description
CubicLineChart()
CubicLineChart(XYMultipleSeriesDataset dataset, XYMultipleSeriesRenderer renderer, float smoothness)	Builds a cubic line chart.

Method Summary

Modifier and Type	Method	Description
protected void	drawPath(Canvas canvas, List<Float> points, Paint paint, boolean circular)	The graphical representation of a path.
protected void	drawPoints(Canvas canvas, Paint paint, List<Float> pointsList, XYSeriesRenderer seriesRenderer, float yAxisValue, int seriesIndex, int startIndex)	Draws the series points.
String	getChartType()	Returns the chart type identifier.

Methods inherited from class LineChart

clickableAreasForPoints, drawLegendShape, drawSeries, getLegendShapeWidth, getPointsChart, isRenderPoints, setDatasetRenderer

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

Modifier and Type	Method	Description
void	draw(Canvas canvas, int x, int y, int width, int height, Paint paint)	The graphical representation of the XY chart.
protected void	drawChartValuesText(Canvas canvas, XYSeries series, XYSeriesRenderer renderer, Paint paint, List<Float> points, int seriesIndex, int startIndex)	The graphical representation of the series values as text.
protected void	drawSeries(XYSeries series, Canvas canvas, Paint paint, List<Float> pointsList, XYSeriesRenderer seriesRenderer, float yAxisValue, int seriesIndex, XYMultipleSeriesRenderer.Orientation or, int startIndex)	Draws the series.
protected void	drawText(Canvas canvas, String text, float x, float y, Paint paint, float extraAngle)	The graphical representation of a text, to handle both HORIZONTAL and VERTICAL orientations and extra rotation angles.
protected void	drawXLabels(List<Double> xLabels, Double[] xTextLabelLocations, Canvas canvas, Paint paint, int left, int top, int bottom, double xPixelsPerUnit, double minX, double maxX)	The graphical representation of the labels on the X axis.
protected void	drawXTextLabels(Double[] xTextLabelLocations, Canvas canvas, Paint paint, boolean showLabels, int left, int top, int bottom, double xPixelsPerUnit, double minX, double maxX)	The graphical representation of the text labels on the X axis.
protected void	drawYLabels(Map<Integer, List<Double>> allYLabels, Canvas canvas, Paint paint, int maxScaleNumber, int left, int right, int bottom, double[] yPixelsPerUnit, double[] minY)	The graphical representation of the labels on the Y axis.
double[]	getCalcRange(int scale)
XYMultipleSeriesDataset	getDataset()
double	getDefaultMinimum()	Returns the default axis minimum.
XYMultipleSeriesRenderer	getRenderer()
protected Rectangle	getScreenR()
SeriesSelection	getSeriesAndPointForScreenCoordinate(Point screenPoint)	Given screen coordinates, returns the series and point indexes of a chart element.
protected List<Double>	getXLabels(double min, double max, int count)
protected Map<Integer, List<Double>>	getYLabels(double[] minY, double[] maxY, int maxScaleNumber)
protected boolean	isRenderNullValues()	Returns if the chart should display the null values.
void	setCalcRange(double[] range, int scale)
protected void	setScreenR(Rectangle screenR)
double[]	toRealPoint(float screenX, float screenY)
double[]	toRealPoint(float screenX, float screenY, int scale)	Transforms a screen point to a real coordinates point.
double[]	toScreenPoint(double[] realPoint)
double[]	toScreenPoint(double[] realPoint, int scale)

Methods inherited from class AbstractChart

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

Modifier and Type	Method	Description
protected static float[]	calculateDrawPoints(float p1x, float p1y, float p2x, float p2y, int screenHeight, int screenWidth)
protected void	drawBackground(DefaultRenderer renderer, Canvas canvas, int x, int y, int width, int height, Paint paint, boolean newColor, int color)	Draws the chart background.
protected void	drawLabel(Canvas canvas, String labelText, DefaultRenderer renderer, List<Rectangle2D> prevLabelsBounds, int centerX, int centerY, float shortRadius, float longRadius, float currentAngle, float angle, int left, int right, int color, Paint paint, boolean line, boolean display)	Draws a text label.
protected int	drawLegend(Canvas canvas, DefaultRenderer renderer, String[] titles, int left, int right, int y, int width, int height, int legendSize, Paint paint, boolean calculate)	Draws the chart legend.
protected void	drawPath(Canvas canvas, float[] points, Paint paint, boolean circular)	The graphical representation of a path.
protected void	drawString(Canvas canvas, String text, float x, float y, Paint paint)	Draw a multiple lines string.
protected boolean	getExceed(float currentWidth, DefaultRenderer renderer, int right, int width)	Calculates if the current width exceeds the total width.
protected String	getLabel(NumberFormat format, double label)	Makes sure the fraction digit is not displayed, if not needed.
protected int	getLegendSize(DefaultRenderer renderer, int defaultHeight, float extraHeight)	Calculates the current legend size.
boolean	isNullValue(double value)
boolean	isVertical(DefaultRenderer renderer)	Checks if the current chart is rendered as vertical.

Methods inherited from class Object

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

Modifier and Type	Method	Description
protected Object	clone()
boolean	equals(Object obj)	Indicates whether some other object is "equal to" this one.
final Class	getClass()	Returns the runtime class of an object.
int	hashCode()	Returns a hash code value for the object.
final void	notify()	Wakes up a single thread that is waiting on this object's monitor.
final void	notifyAll()	Wakes up all threads that are waiting on this object's monitor.
String	toString()	Returns a string representation of the object.
final void	wait()	Causes current thread to wait until another thread invokes the method or the method for this object.
final void	wait(long timeout)	Causes current thread to wait until either another thread invokes the method or the method for this object, or a specified amount of time has elapsed.
final void	wait(long timeout, int nanos)	Causes current thread to wait until another thread invokes the method or the method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.

Field Details

TYPE

public static final String TYPE

The chart type.

See Also:

• Constant Field Values

Constructor Details

CubicLineChart

public CubicLineChart()

CubicLineChart

public CubicLineChart(XYMultipleSeriesDataset dataset,
 XYMultipleSeriesRenderer renderer,
 float smoothness)

Builds a cubic line chart.

Parameters

• dataset: the dataset

• renderer: the renderer

• smoothness: @param smoothness smoothness determines how smooth the curve should be, range [0->0.5] super smooth, 0.5, means that it might not get close to control points if you have random data // less smooth, (close to 0) means that it will most likely touch all control // points

Method Details

drawPath

protected void drawPath(Canvas canvas,
 List<Float> points,
 Paint paint,
 boolean circular)

Description copied from class: AbstractChart

The graphical representation of a path.

Parameters

• canvas: the canvas to paint to

• points: the points that are contained in the path to paint

• paint: the paint to be used for painting

• circular: if the path ends with the start point

Overrides:

drawPath in class AbstractChart

drawPoints

protected void drawPoints(Canvas canvas,
 Paint paint,
 List<Float> pointsList,
 XYSeriesRenderer seriesRenderer,
 float yAxisValue,
 int seriesIndex,
 int startIndex)

Draws the series points.

Parameters

• canvas: the canvas

• paint: the paint object

• pointsList: the points to be rendered

• seriesRenderer: the series renderer

• yAxisValue: the y axis value in pixels

• seriesIndex: the series index

• startIndex: the start index of the rendering points

Overrides:

drawPoints in class XYChart

getChartType

public String getChartType()

Returns the chart type identifier.

Returns

the chart type

Overrides:

getChartType in class LineChart