B4J Library [B4X] [XUI] xChart Class and b4xlib

klaus · Apr 12, 2018

Current version 9.8

A lite version is available: xChartLite.
A mini version is also available: xChartMini.

Learning B4XViews and XUI, I wrote this CustomView xChart Class.
It is an evolution of Erels' Android Charts Framework.

The xChart custom view is a B4X libary.
It works on all three platforms: B4A, B4i and B4J.
The xChart.b4xlib and the xChart.xml files are attached.
You need to copy the xChart.b4xlib file to the AdditionlLibraries\B4X folder!
The recommended AdditionlLibraries folder structure is explained HERE.

Do not copy the xChart.xml file to the AdditionalLibraries folder, copy it in another folder for all b4xlib xml files.
Example: AdditionlLibraries\B4XlibXMLFiles
The xChart.xml file is for help purposes only and is useful with the B4X Help Viewer or the B4XObjectBrowser.
The xChart.xml file was generated with this tool: b4xlib - XML generation

It has automatic scales, linear and logarithmic, automatic text size according to the chart size.
These can also be set manually.

Demo projects for all three platforms as a B4XPages project.
Tested on PC, Android Samsung S10, Samsung Tab S2, iPhone 8 and iPad.
B4XPagesxChartDemoV8_8.zip A B4XPages cross platform project using the xChart library, you need to copy the xChart.b4xlib file into your AdditionalLibraries\B4X folder.
B4JLogScaleV8_8.zip B4J project showing the logarithmic scales, it uses also the xChart library.
xChart.b4xlib The xChart B4X library file. You must copy it into your your AdditionalLibraries\B4X folder.
xChart.xml Help file, it is useful with the B4X Help Viewer or the B4XObjectBrowser.
Don’t copy the xChart.xml file to the AdditionalLibraries folder! Look above.

This image is from the B4JLogScale demo project, there is only a B4J project to show logarithmic scale examples.
The principles are the same for the two other platforms.

4 lines with 4 different scales the same lines with the same scale.

Radar type chart

H_BAR chart type H_STACKED_BAR chart type

The horizontal scale can be either on bottom, default, or on top.
The vertical scale values can go from bottom to top, default, or from top to bottom.

YX_CHART with display of the cursor position.
When the cursor is on a point, the cross-hair color changes to the curve color and a circle is drawn at the point if no points are drawn.

AREA and STACKED_AREA chart

CANDLE chart

WATERFALL chart

BUBBLE chart

EDIT: 2023.08.06 Version 9.8
Changed SetZoomIndexes Zoom.EndIndex not limited to previous Zoom.EndIndex
Set zoom min cursor width from 10dip to 15dip
The first change allows zooming with dynamic data input and move the zoom cursor at the end.
Demo program for dynamic data and zoom.
Only the xChart.b4xlib and xChart.xml files have been updated.

EDIT: 2023.06.08 Version 9.7
Added a warning for the RemovePointData method
Changed getNbPonts to Return Points.size
Added ZoombarEnabled property, code only not in the Designer
Only the xChart.b4xlib and xChart.xml files have been updated.

EDIT: 2023.03.13 Version 9.6
Amended a problem with zoom.

EDIT: 2023.03.11 Version 9.5
Amended AutomaticScales with only one point
Only the xChart.b4xlib and xChart.xml files have been updated.

EDIT: 2023.02.12 Version 9.4
Added SetZoomSteps(SmallStep As Int, BigStep As Int) method
Added ZoomLeftButtonClick, ZoomRightButtonClick, ZoomLeftAreanClick and ZoomRightAreaClick events
Added ZoomSmallStep, ZoomBigStep, ZoomBeginIndex, ZoomEndIndex and ZoomNbVisiblePoints properties read only
Amended multiple zoom problem
Amended GetCursorIndex when zoomed
Added XZeroAxis and XZeroAxisHighlight properties
Only the xChart.b4xlib and xChart.xml files have been updated.

EDIT: 2022.10.12 Version 9.2
Added SetCustomFont(CustomFontName, CustomFontScale) method,example HERE.
Amended legend top position overlapping with the title.
Only the xChart.b4xlib and xChart.xml files have been updated.

EDIT: 2022.10.08 Version 9.1
Replaced all Props.Get by Props.GetDefault
Amended problem with DisplayValues, DisplayCursor and DisplayValuesOnHover
Added GetMaxNumberBars2, does not need to know the data values.
Added PieGapDegrees and PieAddPercentage properties in the code
Only the xChart.b4xlib and xChart.xml files have been updated.

EDIT: 2022.06.26 Version 9.0
Added the DisplayValuesOnHover property: Show values when hovering with the cursor over a chart; valid only for B4J.
Only the xChart.b4xlib and the xChart.xml file have been updated, the xChart.bas file has been removed.

EDIT: 2022.06.01 Version 8.9
Amended problem with min bar width for STACKED_BAR charts.
Only the xChart.b4xlib, xChart.bas and xChart.xml files have been updated.

EDIT: 2022.04.24 Version 8.8
Added a new property: CandleDisplayVolume, False by default
Added a new method: AddCandlePoint2 including the Volume parameter
Renamed CursorIndex to CursorPointIndex in the CursorTouch event routine
Added DisplayCursor property to allow to display the cursor without displaying the values, False by default

EDIT: 2022.04.20 Version 8.7
Amended bottom margin when no X scale is displayed.

EDIT: 2022.04.15 Version 8.6
Added BUBBLE chart and BubbleDiameterMax, BubbleDiameterMin and BubbleSmallSnap properties.

EDIT: 2022.03.31 Version 8.5
Added WATERFALL chart and the WaterfallTotalBarColor property.
The CandleDecreaseColor and CandleIncreaseColor properties were changed to DecreaseColor and IncreaseColor.
These properties are also used with WATERFALL charts.

EDIT: 2022.03.27 Version 8.4
Added the CandleWickWidth property
Changed the word Shadow to Wick for the Candle properties

EDIT: 2022.03.27 Version 8.3
Version 8.3
Added CANDLE chart
Version 8.2
Added the YAxisName2 property, a second Y axis name for different scales

EDIT: 2021.11.29 Version 8.1
Added a HideLine method allowing to not display a line.
Added SetYScaleNMinValue, GetYScaleNMinValue, SetYScaleNMaxValue and GetYScaleNMaxValue methods.
Amended problem with DrawLinesNScales and zoom
Amended some minor problems.

EDIT: 2021.11.29 Version 8.0
Amended graph height when no x scale nor x axis name.
Added display of a YXChart line with only one point value with logarithmic scales.

I removed the old update history.

xCharts

Author: Klaus CHRISTL (klaus)
Version: 9.8

xChart
- Events:
  - CursorTouch (Action As Int, CursorPointIndex As Int)
  - Touch (X As Double, Y As Double)
  - ZoomLeftAreaClick
  - ZoomLeftButtonClick
  - ZoomRightAreaClick
  - ZoomRightButtonClick
- Fields:
  - xBase As B4XView
  - Items As List
    Items are Bars, Lines etc.
  - Points As List
    Points contain the point coordinates.
- Methods:
  - AddBar (Name As String, BarColor As Int) As String
    adds a bar
    only for Bar and StackedBar charts !
  - AddBarMultiplePoint (X As String, YArray As Double())
    adds multibar points data
    only for Bar and StackedBar charts !
  - AddBarPointData (X As String, Y As Double) As String)
    adds single bar point data
    only for Bar charts !
  - AddBubble (SerieIndex As Int, X As Double, Y As Double, Value v Double)
    Adds a point in the given Bubble series.
    A series Bubble has no name but an x / y position and a value.
    The value determines the area of the circle and not the radius nor diameter.
    Only for BUBBLE charts.
  - AddBubbleSeries (Name As String, BubbleColor As Int)
    Adds a Bubble series.
    A Bubble series has a name and can contain bubbles with a value at different positions.
    Only for BUBBLE charts.
  - AddBubbleSingle (Name As String, X As Double, Y As Double, Value As Double, BubbleColor As Int)
    Adds a single Bubble.
    A single Bubble has a name, a value and a position.
    It is the same as a Bubble series with only one bubble.
    The value determines the area of the circle and not the radius nor diameter.
    Only for BUBBLE charts.
  - AddCandlePoint (X As String, Open As Double, Height As Double, Low As Double, Close As Double, ShowTick As Boolean)
    Adds a Candel point.
    ShowTick = True displays the x value on the X axis.
  - AddCandlePoint2 (X As String, Open As Double, Height As Double, Low As Double, Close As Double, Volume As Double, ShowTick As Boolean)
    Adds a Candel point.
    Volume = Transaction volume during the time period.
    ShowTick = True displays the x value on the X axis.
  - AddHorizontalLine (Value As Double, Color As Int, StrokeWidth As Int, DisplayValue As Boolean)
    Adds a horizontal line at the given Y scale value with the given color and width.
    If a line with this value already exist, updates the Color and StrokeWidth.
    Valid for BAR and HBAR charts and LINE charts only with same Y scales.
    Valid also for H_BAR charts charts only with same Y scales, but the line is vertical.
  - AddLine (Name As String, LineColor As Int)
    adds a line
    only for Line charts !
  - AddLine2 (Name As String, LineColor As Int, StrokeWidth As Int, PointType As String, PointFilled As Boolean, PointColor As Int) As String
    adds a line
    StrokeWidth = line thickness
    PointType, possible values: "NONE", "CIRCLE", "SQUARE", "TRIANGLE", "RHOMBUS", "CROSS+", "CROSSX"
    only for Line charts !
  - AddLineMultiplePoints (X As String, YArray As Double(), ShowTick As Boolean) As String
    adds multiline points data
    ShowTick = True displays the x value in the X axis
    only for Line charts !
  - AddLinePointData (X As String, Y As Double, ShowTick As Boolean)
    adds single line point data
    ShowTick = True displays the x value in the X axis
    only for Line charts !
  - AddPie (Name As String, Value As Float, Color As Int) As String
    Adds a pie slice item
    Color: 0 = random color
    only for Pie charts !
  - AddRadar (Name As String, Color As Int, SrokeWidth As Int, Filled As Boolean)
    adds a radar
    only for Radar charts !
  - AddRadar2 (Name As String, Color As Int, SrokeWidth As Int, Filled As Boolean, PointType As String, PointFilled As Boolean, PointColor As Int)
    adds a radar
    PointType, possible values: "NONE", "CIRCLE", "SQUARE", "TRIANGLE", "RHOMBUS", "CROSS+", "CROSSX"
    only for Radar charts !
  - AddRadarMultiplePoint (X As String, YArray As Double)
    adds multiradar points data
    only for Radar charts !
  - AddRadarPointData (X As String, Y As Double)
    adds single radar data
    only for Radar charts !
  - AddWaterfallPoint(BarType As Stringg, X As String, Y As Double)
  - AddYXLine (Name As String, LineColor As Int, StrokeWidth As Int) As String
    adds a YXLine
    only for YXCharts !
  - AddYXLine2 (Name As String, LineColor As Int, StrokeWidth As Int, DrawLine As Boolean, PointType As String, PointFilled As Boolean, PointColor As Int) As String
    adds a YX line
    StrokeWidth = line thickness
    DrawLine = False allows to draw only the points
    PointType, possible values: "NONE", "CIRCLE", "SQUARE", "TRIANGLE", "RHOMBUS", "CROSS+", "CROSSX"
    only for YXCharts !
  - AddYXPoint (LineIndex As Int, X As Double, Y As Double) As String
    adds a point in the given lines
  - Base_Resize (Width As Double, Height As Double)
    resizes the Chart with new Width and Height
  - ClearData
    clears all data, not the title nor axis names
  - ClearDisplayedValues
    Clears the cursor and displayed values
    useful if KeepDisplayValues was set to True
  - ClearPoints
    clears all points, not the title nor axis names
  - DrawChart
    draws a chart
  - DrawEmptyChart
    Draws an empty chart with the current background color.
  - GetYScaleNMaxValue (Index As Int)
    Gets the Y scale max value for the given curve.
    Index of the curve between 0 and 3.
    Works only with AutomaticScale = False.
    Setting YScaleMaxValue sets automatically AutomaticScale = False.
  - GetYScaleNMinValue (Index As Int)
    Gets the Y scale min value for the given curve.
    Index of the curve between 0 and 3.
    Works only with AutomaticScale = False.
    Setting YScaleMaxValue sets automatically AutomaticScale = False.
  - GetMaxNumberBars As Int
    Returns an Int
    gets the max number of displayable bars or group of bars
    this method can be called before DrawChart to determine the number max of displayable bars
    this can allow to adapt the filling routine according to the capacity of the chart.
  - GetMaxNumberBars2 As Int
    Gets the max number of displayable bars or group of bars.
    This method can be called before DrawChart to determine the number max of displayable bars.
    This can allow to adapt the filling routine according to the capacity of the chart.
    Not as precise as GetMaxNumberBars.
  - Initialize (Callback As Object, EventName As String) As String
  - IsInitialized As Boolean
    Tests whether the object has been initialized.
  - JumpTo (Index As Int)
    Jumps to the given index when a chart is zoomed.
    does nothing when the chart is unzoomed.
  - NumberFormat3 (Number As Double, MaxDigits As Int) As String
    formats a number with scientific notation
    MaxDigits = number max of digits
    Examples: 1.23456 / 12.3456 / 1234.56 / 123456 / 1.23E10
  - NumberFormat4 (Number As Double, MaxDigits As Int, Scientific As Boolean) As String
    Formats a number with either scientific notation or n, , m, K, M, G notation.
    MaxDigits = number max of digits.
    Examples for 6 digits: 1.23456 / 12.3456 / 1234.56 / 123456 / 1.23E10.
    Examples for 6 digits: 1.23456 / 12.3456 / 1.23456K / 12.3456K / 1.23G.
  - RemoveHorizontalLine (Value As Double)
    Removes the horizontal line from the list with the given value.
    Value = Y scale value.
  - RemovePointData (Index As Int) As String
    removes the data of the point with the given index
  - SetBarMeanValueFormat (MinimumIntegers As Int, MaximumFractions As Int, MinimumFractions As Int, GroupingUsed As Boolean)
    sets a custom numberformat for the bar mean line value, values like NumberFormat2
    if set, it overides the default format
    to go back to the default format, comment the line defining the custom number format
  - SetCustomFont (CustomFontName As String, CustomFontName As Double)
    Sets a custom font.
    CustomFontName can be either:
    a custom font ttf file, B4J and B4A
    or a font name only B4J
    CustomFontScale is a scale factor to increas or decrease the text sizes
    epending if the font is bigger or smaller than the defautl font
    Defautlt value = 1
    B4i, when you use a ttf file you must add the line below in the Main module in the Project Attributes Region:
    #AppFont: MyCustomFont.ttf, replace MyCustomFont by the name of the custom font.
    Explanations here: https://www.b4x.com/android/forum/threads/custom-fonts.46461/#content
    Example with a custom font file:
    xChart1.SetCustomFont("MyCustomFont.ttf", 1.2)
    Example with a custom font name:
    xChart1.SetCustomFont("Times New Roman", 1)
    Example back to default font (in this case the CustomFontScale value is automatically set to 1):
    xChart1.SetCustomFont("", 1)
  - SetYScaleNMaxValue (Index As Int)
    Sets the Y scale max value for the given curve.
    Index of the curve between 0 and 3.
    Works only with AutomaticScale = False.
    Setting YScaleMaxValue sets automatically AutomaticScale = False.
  - SetYScaleNMinValue (Index As Int)
    Sets the Y scale min value for the given curve.
    Index of the curve between 0 and 3.
    Works only with AutomaticScale = False.
    Setting YScaleMinValue sets automatically AutomaticScale = False.
  - SetZoomIndexes (BeginIndex As Int, EndIndex As Int)
    sets the zoom indexes, the values must be between 0 and Points.Size -1
    valid only for LINE, BAR, STACKED_BAR, H_LINE, H_BAR and H_STACKEDBAR charts
    this method should be called after having added the points data.
  - SetZoomSteps (SmallStep As Int, BigStep As Int)
    Sets the zoom steps
    SmallStep = step when the left or right button is pressed
    BigStep = step when the area between the lider and a button is pressed
  - UnZoom
    Unzooms the chart.
- Properties:
  - AreaFillAlphaValue As Int
    gets or sets the AreaFillAlphaValue property
    this value represents the alpha value of the area fill color for AREA and STACHED_AREA charts only
    the area fill color is the line color with this alpha value
  - AutomaticScale As Boolean
    gets or sets the AutomaticScale property
    if True, the scales are automatically calculated to fill the chart, with 1, 2, 2.5, 5 standardized scales
  - AutomaticTextSizes As Boolean
    gets or sets the AutomaticTextSizes property
    if True, the text sizes are automatically calculated according to the chart size
  - AxisTextColor As Int
    gets or sets the AxisTextColor property
  - AxisTextSize As Float
    gets or sets the AxisTextSize property
    setting this text size sets automatically AutomaticTextSizes = False
  - BarValueOrientation As Boolean
    gets or sets the BarValueOrientation property
    Possible values: VERTICAL, HORIZONTAL
  - BubbleDiameterMax As Double
    Gets or sets the BubbleDiameterMax, only for BUBBLE charts.
    Max diameter of a bubble in percent of the smallest chart side (width or height).
    This value is used for the highest bubble value.
    For lower values, the bubble area is proportional. The diameter is proportional to the square root of the ratio.
    Default value 10%.
  - BubbleDiameterMin As Double
    Gets or sets the BubbleDiameterMin, only for BUBBLE charts.
    Min diameter of a bubble in percent of the smallest chart side (width or height).
    Default value 1%.
  - BubbleSmallSnap As Boolean
    Gets or sets the BubbleSmallSnap, only for BUBBLE charts.
    False = the cursor snaps when it is insides the bubble.
    True = the cursor snaps when it is near the bubble center (3dip).
    Default value False.
  - CandleDrawBodyBorder As Boolean
    Gets or sets the getCandleDrawBodyBorder, only for CANDLE charts.
    Draws a border on the candle body with the shadow color.
  - CandleDisplayVolume As Boolean
    Gets or sets the CandleDisplayVolume, only for CANDLE charts.
    'True = displays the trade Volume on the bottom of the CANDLE chart and displays its value in the popup panel.
    'Example code: <code>CandleChart1.CandleDisplayVolume = True</code>
  - CandleWickColor As Int
    Gets or sets the CandleWickColor, only for CANDLE charts.
    Wick is the line above and below the candle body when the Open and Close values are above or below the Low and High values.
    It must be a xui.Color value, FF0000FF (Blue) = default value.
    Example code:
    CandleChart1.CandleWickColor = xui.Color_Black
  - CandleWickWidth As Int
    Gets or sets the CandleWickWidth, only for CANDLE charts.
    Wick is the line above and below the candle body when the Open and Close values are above or below the Low and High values.
    It must be a dip value, not a pixel value.
    Example code:
    CandleChart1.CandleWickWidth = 1
  - ChartBackgroundColor As Int
    sets the ChartBackgroundColor property
    the color must be an xui.Color
    Example code: <code>xChart1.ChartBackgroundColor = xui.Color_RGB(207, 220, 220)</code>
  - ChartType As String
    gets or sets the chart type
    Possible values: LINE, BAR, H_BAR, STACKED_BAR, H_STACKED_BAR, PIE, YX_CHART, RADAR
  - DecreaseColor As Boolean
    Gets or sets the DecreaseColor, only for CANDLE and WATERFALL charts.
    The DecreaseColor is used in CANDLE charts when the Close value is lower than the Open value.
    Or in WATERFALL charts when the bar value is negative.
    It must be a xui.Color value, FFAA0000 (Green) = default value.
    Example code:
    CandleChart1.DecreaseColor = xui.Color_RGB(128, 0, 0)
  - DifferentScales As Boolean
    gets or sets the DifferentScales property, only for LINE and YX_CHART charts.
    when True, displays the lines with different automatic scales for two up to four lines.
    if the number of lines is smaller than 2 and bigger than 4, then all lines have the same scale.
  - DisplayCursor As Boolean
    Gets or sets the DisplayCursor property.
    Allows to displays the cursor when clicking or moving on the chart when DislpayValues = False.
  - DisplayValues As Boolean
    gets or sets the DisplayValues property
    if True, displays the point values when moving the finger or the cursor on the chart.
  - DisplayValuesOnHover As Boolean
    gets or sets the DisplayValuesOnHover property
    if True, displays the item values when hovering with the cursor over a chart; valid only for B4J.
  - DrawGridFrame As Boolean
    sets or gets the DrawGridFrame property, True by default
    if False, no frame, only the X and Y axes are drawn
  - DrawHorizontalGridLines As Boolean
    sets or gets the DrawHorizontalGridLines property, True by default
    if False, no horizontal grid lines are drawn
  - DrawOuterFrame As Boolean
    gets or sets the DrawOuterFrame property of the Chart
    draws an outer frame around the chart
  - DrawVerticalGridLines As Boolean
    sets or gets the DrawVerticalGridLines property, True by default
    if False, no vertical grid lines are drawn
  - DrawXScale As Boolean
    gets or sets the DrawXScale property
    True by default, if False doesn't draw the X scale values
    not drawing the scale can be useful for small charts
    not for logarithmic scales
  - DrawYScale As Boolean
    gets or sets the DrawYScale property
    True by default, if False doesn't draw the Y scale values
    not drawing the scale can be useful for small charts
    not for logarithmic scales
  - GradientColors As Boolean
    gets or sets the GradientColors property
  - GradientColorsAlpha As Int
    gets or sets the GradientColorsAlpha property
    values between 0 and 255
    setting this value, set automatically the GradientColors property to True
  - GridColor As Int
    sets the GridColor property
    the color must be an xui.Color
    Example code: <code>xChart1.GridColor = xui.Color_RGB(169, 169, 169)</code>
  - GridFrameColor As Int
    sets the GridFrameColor property
    the color must be an xui.Color
    Example code: <code>xChart1.GridFrameColor = xui.Color_Blue</code>
  - HBarTicksTopDown As Boolean
    gets or sets the HBarsTicksTopDown property for H_BAR and H_STACKED_BAR charts
    False = draws the tick values from bottom to top, default value
    True = draws the tick from top to bottom
  - HBarXScaleOnTop As Boolean
    gets or sets the HBarsXScaleOnTop property for H_BAR and H_STACKED_BAR charts
    False = draws the horizontal scale on bottom, default value
    True = draws the horizontal scale on top
  - Height As Int
    gets or sets the Height property
  - IncludeBarMeanLine As Boolean
    gets or sets the IncludeBarMeanLine property
    possible only for single bar charts
  - IncludeLegend As String
    gets or sets the IncludeLegend property
    possible values: NONE, TOP_RIGHT, BOTTOM
  - IncludeMaxLine As Boolean
    gets or sets the IncludenMaxLine property, only for single line Chart
    inserts a line at the level of the max value
  - IncludeMeanLine As Boolean
    gets or sets the IncludeMeanLine property, only for single line Chart
    inserts a line at the level of the mean value
  - IncludeMinLine As Boolean
    gets or sets the IncludeMinLine property, only for single line Chart
    inserts a line at the level of the min value
  - IncludeValues As String
    gets or sets the IncludeValues property
    possible only for single bar charts or pie charts with TOP_RIGHT legend
  - IncreaseColor As Int
    Gets or sets the IncreaseColor, only for CANDLE and WATERFALL charts.
    The IncreaseColor is used in CANDLE charts when the Close value is higher than the Open value.
    Or in WATERFALL charts when the bar value is negative.
    It must be a xui.Color value, FF00AA00 (Green) = default value.
    Example code:
    CandleChart1.IncreaseColor = xui.Color_RGB(0, 128, 0)
  - KeepDisplayValues As String
    gets or sets the KeepValuesDisplay property
    possible values:
    NONE >; deletes the cursor and the displayed values after Touch_Up
    CURSOR >; keeps the cursor visible but deletes the values after Touch_Up
    BOTH >; keeps both, the cursor and the values visible after Touch_Up
  - Left As Int
    gets or sets the Left property
  - LegendBackgroundColor As Int
    sets the LegendBackgroundColor property
    the color must be an xui.Color
    Example code: xChart1.LegendBackgroundColor = xui.Color_ARGB(102, 255, 255, 255)
  - LegendTextColor As Int
    sets the LegendTextColor property
    the color must be an xui.Color
    Example code: xChart1.LegendTextColor = xui.Color_Black
  - LegendTextSize As Float
    gets or sets the LegendTextSize property
    setting this text size sets automatically AutomaticTextSizes = False
  - MaxLineColor As Int
    sets the single line chart MaxLineColor property
    the color must be an xui.Color
    Example code: <code>xChart1.MaxLineColor = xui.Color_Red</code>
  - MeanLineColor As Int
    sets the single line chart MeanLineColor property
    the color must be an xui.Color
    Example code: <code>xChart1.MeanLineColor = xui.Color_RGB(182, 74, 26)</code>
  - MinLineColor As Int
    sets the single line chart MinLineColor property
    the color must be an xui.Color
    Example code: <code>xChart1.MinLineColor = xui.Color_RGB(0, 128, 0)</code>
  - MissingDataValue As Double
    gets or sets the MissingDataValue property, only for LINE charts
    default value 1000000000
    when you set any value in a Line chart, it is considerd as a missing value
  - NbPoints As Int [read only]
    gets the number of points (read only)
  - NbXIntervals As Int
    gets or sets the NbYIntervals property, number of X axis intervals
    should be an even number, otherwise the 0 scale value might not be displayed
    valid only for YXCharts
  - NbYIntervals As Int
    gets or sets the NbYIntervals property, number of Y axis intervals
    should be an even number, otherwise the 0 scale value might not be displayed
  - PieAddPercentage As Boolean
    gets or sets the PieAddPercentage property.
  - PieGapDegrees As Int
    gets or sets the PieGapDegrees property.
    default value = 0
  - PiePercentageNbFractions As Int
    gets or sets the number of fractions for pie percentage values
    min = 0 max = 2
  - PieStartAngle As Int
    gets or sets the PieStartAngle property
    default value = 0 (three o'clock), positive clockwise
    twelve o'clock = -90
  - RadarDrawScale As Boolean
    gets or sets the RadarDrawScale property for RADAR charts
    True = draws the spider web type scale lines or circles
    depends on the RadarScaleType property SPIDER or CIRCLE
  - RadarDrawScaleValues As Boolean
    gets or sets the RadarDrawScaleValues property for RADAR charts
    True = draws the scale values
  - RadarScaleType As String
    gets or sets the RadarScaleType property for RADAR charts
    Either SPIDER or CIRCLE
  - RadarStartAngle As Int
    gets or sets the RadarStartAngle property for RADAR charts
    default value = 0 (three o'clock), positive clockwise
    twelve o'clock = -90
  - RemoveHorizontalLine (Value As Double)
    removes the horizontal line from the list with the given value.
    Value = Y scale value.
  - RemovePointData (Index As Int)
    removes the data of the point with the given index.
  - ReverseYScale As Boolean
    gets or sets the ReverseYScale property, only for LINE and YX_CHART charts
    False means min value on top and max value.
    True means min value at bottom and max value at bottom on top. Default value.
  - Rotation As Double
    gets or sets the Rotation property of the Chart
    rotates the entire chart
  - ScalesOnZoomedPart As Boolean
    gets or sets the ScalesOnZooedPart property.
    False means scales on the whoel chart.
    True means scales on the zooem part only.
  - ScaleTextColor As Int
    sets the ScaleTextColor property
    the color must be an xui.Color
    Example code: <code>xChart1.ScaleTextColor = xui.Color_Blue</code>
  - ScaleTextSize As Float
    gets or sets the ScaleTextSize property
    setting this text size sets automatically AutomaticTextSizes = False
  - ScaleValues As String
    gets or sets the ScaleValues property
    it is a string with the different scale values separated by the exclamation mark.
    it must begin with 1! and end with !10
    Example: the default property 1!2!2.5!5!10
  - ScaleXValuesLog As String
    gets or sets the ScaleXValuesLog property
    it is a string with the different scale values, for one decade, separated by the exclamation mark
    it must begin with 1! and end with !10
    only for YX_CHART X scale
    Example: the default property 1!2!5!7!10
  - ScaleYValuesLog As String
    gets or sets the ScaleYValuesLog property
    it is a string with the different scale values, for one decade, separated by the exclamation mark
    it must begin with 1! and end with !10
    only for LINE Y scale and YX_CHART Y scale
    Example: the default property 1!2!5!7!10
  - Snapshot As B4XBitmap [read only]
    returns a B4XBitmap object of the chart (read only)
  - Subtitle As String
    gets or sets the Subtitle property
  - SubtitleTextColor As Int
    gets or sets the SubtitleTextColor property
    the color must be an xui.Color
    Example code: <code>xChart1.SubitleTextColor = xui.Color_Black</code>
  - SubtitleTextSize As Float
    gets or sets the SubtitleTextSize property
    setting this text size sets automatically AutomaticTextSizes = False
  - Title As String
    gets or sets the Chart title
  - TitleTextColor As Int
    sets the TitleTextColor property
    the color must be an xui.Color
    Example code: <code>xChart1.TitleTextColor = xui.Color_Black</code>
  - TitleTextSize As Float
    gets or sets the TitleTextSize property
    setting this text size sets automatically AutomaticTextSizes = False
  - Top As Int
    gets or sets the Top property
  - ValuesBackgroundColor As Int
    sets the ValuesBackgroundColor property
    the color must be an xui.Color
    Example code: <code>xChart1.ValuesBackgroundColor = xui.Color_Black</code>
  - ValuesTextColor As Int
    sets the ValuesTextColor property
    the color must be an xui.Color
    Example code: <code>xChart1.ValuesTextColor = xui.Color_Black</code>
  - ValuesTextSize As Float
    gets or sets the ValuesTextSize property
    setting this text size sets automatically AutomaticTextSizes = False
  - Visible As Boolean
    gets or sets the Visible property
  - WaterfallTotalBarColor
    Gets or sets the WaterfallTotalBarColor, only for WATERFALL charts.
    Valid only for TotalBars.
    It must be a xui.Color value, FF0000FF (Blue) = default value.
    Example code:
    CandleChart1.WaterfallTotalBarColor = xui.Color_Black
  - Width As Int
    gets or sets the Width property
  - XAxisName As String
    gets or sets the X axis name
  - XMaxValue As Double
    gets or sets the X Max scale value
  - XMinValue As Double
    gets or sets the X Min scale value
  - XScaleLogaritmic As Boolean
    gets or sets the X scale to logarithmic
    valid only for positive numbers and for YX_CHART
  - XScaleMaxValue As Double
    gets or sets the X scale max value
    works only with AutomaticScale = False
    setting XScaleMaxValue sets automatically AutomaticScale = False
    valid only for YXChats
  - XScaleMinValue As Double
    gets or sets the X scale min value
    works only with AutomaticScale = False
    setting XScaleMinValue sets automatically AutomaticScale = False
    valid only for YXChats
  - XScaleTextOrientation As String
    gets or sets the X scale text orientation
    Possible values: VERTICAL, HORIZONTAL, 45 DEGREES
  - XZeroAxis As Boolean
    gets or sets the <xZeroAxis property for LINE charts
    if all values are positives, sets the lower X scale to zero
    if all values are negatives, sets the upper X scale to zero
  - XZeroAxisHighlight As Boolean
    gets or sets the XZeroAxisHighlight property
    if True draws the X Zero axis 2dip thick otherwise with 1dip
  - YAxisName As String
    gets or sets the Y axis name
  - YMaxValue As Double
    gets or sets the Y Max scale value
  - YMinValue As Double
    gets or sets the Y Min scale value
  - YScaleLogarithmic As Boolean
    gets or sets the Y scale to logarithmic
    valid only for positive numbers and for LINE and YX_CHART
  - YScaleMaxValue As Double
    gets or sets the Y scale max value
    works only with AutomaticScale = False
    setting XScaleMaxValue sets automatically AutomaticScale = False
  - YScaleMinValue As Double
    gets or sets the Y scale min value
    works only with AutomaticScale = False
    setting XScaleMaxValue sets automatically AutomaticScale = False
  - YXChartCrossHairColor As Int
    gets or sets the YXChartCrossHairColor property, only for YX_CHARTs.
    it must be a xui.Color value, black = default value.
    Example code: YXChart1.YXChartCrossHairColor = xui.Color_Black.
  - YXChartCrossHairDeltaY As Int
    gets or sets the YXChartCrossHairDeltaY property, only for YX_CHARTs.
    the horizontal line of the cross hair cursor is shifted topwards by the given value.
    this useful to not cover the horizontal cursor line with the finger.
  - YXChartDisplayCrossHair As Boolean
    gets or sets the YXChartDisplayCrossHair property, only for YX_CHARTs.
    True = displays cross hair lines at the cursor position.
  - YXChartDisplayPosition As String
    gets or sets the YXChartDisplayPosition, only for YX_CHARTs.
    possible values:
    CURSOR > displays the coordinates of the cursor position at the cursor position, default value.
    CORNERS > displays the coordinates of the cursor position in one of the four corners.
    Example code: YXChart1.YXChartDisplayPosition = "CURSOR".
  - YXChartDisplayValues As Boolean
    gets or sets the YXChartDisplayValues property, only for YX_CHARTs.
    True = displays the x and y coordinates of the cursor position.
  - YZeroAxis As Boolean
    gets or sets the YZeroAxis property for LINE charts
    if all values are positives, sets the lower Y scale to zero
    if all values are negatives, sets the upper Y scale to zero
  - YZeroAxisHighlight As Boolean
    gets or sets the YZeroAxisHighlight property
    if True draws the Y Zero axis 2dip thick otherwise with 1dip
  - ZoomBarEnabled As Booleannt
    Gets or sets the ZoomBeginIndex property
    If False the zoom bar is disabled
    Default value = True
  - ZoomBeginIndex As Int
    Returns the ZoomBeginIndex property
    ZoomBeginIndex = index of the first displayed point
  - ZoomBigStep As Int
    Returns the zoom big step
    ZoomBigStep = step when the area between the lider and a button is pressed
  - ZoomEndIndex As Int
    Returns the ZoomEndIndex property
    ZoomEndIndex = index of the last displayed point
  - ZoomNbVisiblePoints As Int
    Returns the ZoomNbVisiblePoints property
    ZoomNbVisiblePoints = number of visible points
  - ZoomSmallStep As Int
    Returns the zoom small step
    ZoomSmallStep = step when the left or right button is pressed

klaus · Feb 8, 2023

Do you have an example showing the problem ?

dlh_007 · Feb 9, 2023

通过MakeBMP函数，会生成如下图表：

B4X:

Private Sub CreateLineChart(Width As Int,Height As Int,YAxisName As String)
    ' Initialize the line data
    LineChart1.Width=Width
    LineChart1.Height=Height
    
    LineChart1.ClearData
    
    LineChart1.XAxisName = "s"
    LineChart1.YAxisName = YAxisName
    
    LineChart1.AddYXLine2(publicMod.GetLanguage(117), Colors.Red,2dip,True,"NONE",False,Colors.Red) '0 = random color
    LineChart1.AddYXLine2(publicMod.GetLanguage(118), Colors.Green,2dip,True,"NONE",False,Colors.Green)

    LineChart1.AddYXPoint(0,0,0)
    LineChart1.AddYXPoint(1,0,0)
    LineChart1.DrawChart
End Sub

private Sub MakeBMP(Width As Int,Height As Int) As B4XBitmap
    CreateLineChart(Width,Height,"N")
    LineChart1.AddYXPoint(0,Rnd(1,8), Rnd(500,4000))
    LineChart1.AddYXPoint(1,7, 1500)
    LineChart1.AddYXPoint(0,Rnd(1,8), Rnd(500,4000))
    LineChart1.AddYXPoint(1,8, 1500)
    LineChart1.DrawChart
    Return LineChart1.Snapshot
End Sub

klaus · Feb 9, 2023

Thank you for the example, i will look at when i am at home next week.
Currently i am HERE.

dlh_007 · Feb 10, 2023

klaus said:
Thank you for the example, i will look at when i am at home next week.
Currently i am HERE.

My pleasure。
That place is really beautiful! Enjoy yourself!

klaus · Feb 12, 2023

Done for the next update.

klaus · Feb 12, 2023

The xChart library has been updated to version 9.4.

Added SetZoomSteps(SmallStep As Int, BigStep As Int) method
Added ZoomLeftButtonClick, ZoomRightButtonClick, ZoomLeftAreanClick and ZoomRightAreaClick events
Added ZoomSmallStep, ZoomBigStep, ZoomBeginIndex, ZoomEndIndex and ZoomNbVisiblePoints properties read only
Amended multiple zoom problem
Amended GetCursorIndex when zoomed
Added XZeroAxis and XZeroAxisHighlight properties
Only the xChart.b4xlib and xChart.xml files have been updated.

Peter Simpson · Feb 12, 2023

klaus said:
The xChart library has been updated to version 9.4.

As always thank you for the xChart update @klaus, it's really appreciated.

Just a quick note Klaus:

klaus · Feb 12, 2023

Thank you, I forgot this one.
Done.

klaus · Mar 13, 2023

The xChart library has been updated to version 9.6.
Amended zoom problem.
Amended AutomaticScales with only one point.
Files updated in post #1, only the xChart.b4xlib and the xChart.xml files.

Peter Simpson · Mar 13, 2023

klaus said:
The xChart library has been updated to version 9.6.

Thank you Klaus ?

klaus · Jun 8, 2023

The xChart library has been updated to version 9.7 in the first post.
Added a warning for the RemovePointData method
Changed getNbPonts to Return Points.size
Added ZoombarEnabled property, code only not in the Designer
Only the xChart.b4xlib and xChart.xml files have been updated.

thetrueman · Jul 30, 2023

Hi,
Can it be possible to have Dynamic Zoom Scroll Bar? i.e. We are plotting real-time chart but instead of making line graph massive when there is lot of data after some time, there should be a scroll bar below the graph to see the old graph and otherwise the graph windows should be on predefined zoom level. Thanks.

klaus · Jul 30, 2023

It is possible.
It needed a small change in the xChart library in the SetZoomIndexes routines.
When you scroll during the acquisition, at the next input the zoom goes to the end.

Attached you find a small B4XPages project, only B4J has been used, demonstrating the possibility and the new xChart.b4xlib file.

EDIT: Files have been removed, new ones in post #657.

thetrueman · Jul 30, 2023

klaus said:
It is possible.
It needed a small change in the xChart library in the SetZoomIndexes routines.
When you scroll during the acquisition, at the next input the zoom goes to the end.

Attached you find a small B4XPages project, only B4J has been used, demonstrating the possibility and the new xChart.b4xlib file.

Thanks for quick solution. I tested the zoom function which is basically ok as needed concept but need fine tuning. At the moment when plot data grows sufficiently, the scroll bar cursor Stucks in between even we move it, it come back.
Also at that time the chart lines only show their pointers circle or square on the left edge of the chart and no complete lines to right edge. If we move the scroll bar cursor to left, the old chart appears but we leave the cursor, the chart blanks with only pointer on the left edge of the chart, showing current values.
At this time only X-Axis shows time stamp on first position of the X-Axis start zero position and sometimes shows one more time stamp on the right side of the chart. So initially to fine tune following a couple of suggestions should be consider. Thanks.

1- Scroll bar should be visible always (enable/disable option is for if anybody need or not). At start it should be full until the basic limit of visible data is reached. i.e. if we need to plot 20 readings then it should be going smaller with every data and aligned to right side.

2- If plot data grows huge the scroll bar cursor should have minimum size and should not be shrink any more with more data.

klaus · Jul 31, 2023

thetrueman said:
1- Scroll bar should be visible always (enable/disable option is for if anybody need or not). At start it should be full until the basic limit of visible data is reached.

I will not add this, because it is too specific, only for your case.
No user would like to see a scrollbar for nothing.

thetrueman said:
i.e. if we need to plot 20 readings then it should be going smaller with every data and aligned to right side.

This is already the case.

thetrueman said:
2- If plot data grows huge the scroll bar cursor should have minimum size and should not be shrink any more with more data.

I will look at this.
How many data do you expecting ?

The management of the input of new data and moving the zoom cursor at the same time would be very difficult.
This management is done outsides the xChart library.
The chart is redrawn for each new incoming data and also for each zoom change, so which one has priority.

klaus · Aug 1, 2023

thetrueman said:
2- If plot data grows huge the scroll bar cursor should have minimum size and should not be shrink any more with more data.

This is already the case. The minimum width was set to 10dip.
I have increased it to 15dip for the next update.

klaus · Aug 1, 2023

The attached project does what you expect.
The only point is that the zoom bar is only displayed when the minimum number of data is reached.
At the beginning when the zoom bar is displayed, the zoom is disabled.
When you check the Checkbox, the zoom is enabled and the zoom remains where it is, the new data is of course added.
The management for the zoom is in the main program not in the xChart library.

thetrueman · Aug 2, 2023

klaus said:
The attached project does what you expect.
The only point is that the zoom bar is only displayed when the minimum number of data is reached.
At the beginning when the zoom bar is displayed, the zoom is disabled.
When you check the Checkbox, the zoom is enabled and the zoom remains where it is, the new data is of course added.
The management for the zoom is in the main program not in the xChart library.

Thanks for update and it works as we need it. Actually as I need it to draw voltage current chart real-time, but also I wanted to have many versatile functions in this chart as an asset of B4X. I am switching from classic VB6 where I have very nice such a plot/trend/chart OCX which does all things efficiently which I wanted in B4J to be excellent tool.
Now scroll bar is also working good but ReadingsMax is confusing a bit. i.e. if we want to show chart for 4 hours with data every 5 seconds then what ReadingsMax can be set?

klaus · Aug 3, 2023

thetrueman said:
Now scroll bar is also working good but ReadingsMax is confusing a bit. i.e. if we want to show chart for 4 hours with data every 5 seconds then what ReadingsMax can be set?

4 hours = 240 min = 14400 sec, and every 5 seconds therefor, 14400 / 5 = 2880
ReadingsMax = 2880
If the number of readings exceeds 2880 the first data is removed and the total number of readings remains at this value and you will only see the data of the last 4 hours, the older values are deleted.

thetrueman · Aug 3, 2023

klaus said:
4 hours = 240 min = 14400 sec, and every 5 seconds therefor, 14400 / 5 = 2880
ReadingsMax = 2880
If the number of readings exceeds 2880 the first data is removed and the total number of readings remains at this value and you will only see the data of the last 4 hours, the older values are deleted.

I tried it in your example to increase the ReadingsMax to 3000 but it seems problematic. ReadingsToShow = 20 and ReadingsMax = 3000 and I check Allow Zoom Cursor and scroll back, it only shows 1 minute 30 seconds chart!!! and sometimes less or more!!! Can you check it and what is maximum ReadingsMax value???

B4J Library [B4X] [XUI] xChart Class and b4xlib

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