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

klaus · Apr 12, 2018

Current version 6.8

New !
Drawing of horizontal lines at a given Y value.
Two methods :
- AddHorizontalLine(Value)
- RemoveHorizontalLine(Value)
Display of the cursor position for YX_CHARTs only.

The xChart Class does exist as a class and a B4X libary.
It works on all three products: 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!
Don’t 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 and is useful with the B4X Help Viewer or the B4XObjectBrowser.
The xChart.xml was generated with this tool: b4xlib - XML generation

Learning B4XViews and XUI, I wrote this CustomView xChart Class.
The xChart.bas file is located in the B4J and shared, relative link, in B4A and B4i.
The code is exactly the same, one class file, for all three platforms.

It is an evolution of Erels' Android Charts Framwork.

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.
Tested on PC, Android Samsung S10, Samsung Tab S2, iPhone 8 and iPad.
xChartDemoV6_7.zip One project for each product, the xChart class module in B4J folder with a relative link in the two other products.
B4XPagesxChartDemoV6_7.zip A B4XPages cross platform project using the xChart library, you need to copy the xChart.b4xlib file into your AdditionalLibraries\B4X folder.
B4JLogScaleV6_7.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.bas The Class module.
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 is 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 curor 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.

EDIT: 2021.02.28 Version 6.8
Amended display of 0 values in BAR charts.

EDIT: 2021.02.22 Version 6.7
Added two methods:
AddHorizontalLine(Value) adds a line which is drawn at the given value
RemoveHorizontalLine(Value) removes the line from the List
Added five properties:
YXChartDisplayValues, displays the coordinates of the cursor positions on YXCharts
YXChartDisplayPosition, position of the display on the YXChart.
YXChartDisplayCrossHair, displays the cursor positions as a cross hair cursor on YXCharts
YXChartCrossHairColor, color for the cross hair cursor on YXCharts
YXChartCrossHairDeltaY, the horizontal line of the cross hair cursor is shifted topwards by the given value only for YX_CHARTs
this is useful to not cover the horizontal cursor line with the finger

EDIT: 2021.01.19 Version 6.6
Added horizontal bar types H_BAR and H_STACKED_BAR, the bars are displayed horizontally instead of vertically.
Added HBarsXScaleOnTop property, displays the horizontal scale on top instead on bottom, only for for H_BAR and H_STACKED_BAR charts.
Added HBarsTicksTopDown property, displays the tick values from top to bottom, only for for H_BAR and H_STACKED_BAR charts.
Version 6.5
Added CursorTouch(Action As Int, CursorIndex As Int) event
Added KeepDisplayValues property, allows to keep the values display displayed after Touch_Up.
Added ClearDisplayValues method, allows to clear the values display.
Set Points (point data) and Items (item data, Lines, Bars etc) lists as Public

EDIT: 2020.11.18 Version 6.4
Added Radar type charts.

EDIT: 2020.09.08 Version 6.3
Amended problem with manual scale and all values = 0
Added PieStartAngle property

EDIT: 2020.08.15 Version 6.1
Added LagendTextColor property
Improved SubTitle display

EDIT: 2020.06.24 Version 5.9
Amended problem of legends not for displayed in Pie charts in the top right corner.

EDIT: 2020.06.24 Version 5.8
Amended problem with TitleTextColor for Pie charts.

EDIT: 2020.06.24 Version 5.7
Updated the Tag property according to Erels recommendation:
https://www.b4x.com/android/forum/t...lv-or-any-other-container.117992/#post-738358
Amended error with Round2

EDIT: 2020.04.29 Version 5.6
Improved BAR chart display with many bars.

EDIT: 2020.04.29 Version 5.5
Added DrawXScale and DrawYScale properties

EDIT: 2020.04.22 Version 5.4
Amended bug with manual logarithmic scales

EDIT: 2020.04.21 Version 5.3
Added the four properties below.
- DrawGridFrame As Boolean, True by default
- DrawHorizontalGridLines As Boolean, True by default
- DrawVerticallGridLines As Boolean, True by default
- YZeroAxisHighlight As Boolean, True by default

EDIT: 2020.04.01 Version 5.1
Replaced Props.Get by Props.GetDefault to avoid backward compatibilities.

EDIT: 2020.04.01 Version 5.0
Amended scale error when min and max values are the same.

EDIT: 2020.03.31 Version 4.9
Amended error with different scales.

EDIT: 2020.03.25 'Version 4.8
Added limit of Y scale values if there is not enough place
Improved values display layout
Added different scales for 2 up to 4 lines in LINE and YX_CHART charts.
You need to open the Designer and close it to save the layout file to make the new properties active.

EDIT: 2020.03.19 Version 4.7
Set Base_Resize routine to Publc
Amended the Width and Height property setting.

EDIT: 2020.02.29 Version 4.6
Added the AxisTextColor property
You need to open the Designer and close it to save the layout file to make the new properties active.

EDIT: 2020.02.23 Version 4.5
Added DrawEmptyChart method.
Amended error in the ClearPoints method, YXPoints were not cleared.

EDIT: 2020.02.11 Version 4.4
You need to open the Designer and close it to save the layout file to make the new properties active.
Added logarithmic Y scales for LINE charts
Added logarithmic Y and/or X scales for YX_CHART charts
Added ValuesShowPosition property, can be upper left and new also upper right
Version 4.3 2020.01.07
Improved Bar width calculation

EDIT: 2019.11.05 Version 4.2
Amended Draw MinLine with YZeroAxis.
Added PiePercentageNbFractions property

EDIT: 2019.09.21 Version 4.1
Amended automatic scales issue.

EDIT: 2019.09.20 Version 4.0
Amended automatic scales issue.
Added ClearPoints method version 3.9

EDIT: 2019.02.24 Version 3.8
Added the ScalesValue property, asked in post#192, which allows to set custom automatic scale values
The default ScaleValues property is "1!2!2.5!10"
Another selectable possibiliy is "1!1.2!1.5!1.8!2!2.5!3!4!5!6!7!8!9!10"

EDIT: 2019.02.01 Version 3.7
Amended the bar mean line display problem.

EDIT: 2019.01.18 Version 3.6
Amended wrong results during the first drawing, Added Sleep(0) in Base_Resize
Amended scales for the YXChart type
Amended some minor bugs
Amended scales problem with manual scaling

EDIT: 2019.01.12 Version 3.4
Added following properties: Subtitle, SubtitleTextSize, SubtitleTextColor
Added BarValueOrientation property
Version. 3.3
Amended transparent color

EDIT: 2018.12.21 Version 3.2
Amended errors reported in posts #123 and #140

EDIT: 2018.12.05 Version 3.1
Amended problem with legend at bottom for Pie charts.

EDIT: 2018.11.22 Version 3.0
Amended problem with bar charts width many bars, and bar width too small < 4dip
Improved bar width calculation

EDIT: 2018.11.15 Version 2.9
Improved scale drawing
use of the MeanLineColor property also for single Bar charts

EDIT: 2018.11.14 Version 2.8
Amended Bar mean line property
Added number format for Bar mean line value

EDIT: 2018.11.05 Version 2.7
Improved x scale drawing, avoid text overlapping
Ammended an error

EDIT: 2018.11.04 Version 2.6
Added min, max and mean lines for single line charts.
Improved automatic scale calculation.
Amended some errors.

EDIT: 2018.01.03 Version 2.5
Improved sacle display
Added dynamic lines in the B4A demo project

EDIT: 2018.08.31 Version 2.4
Ameded error with Legend.IncludeLegend <> "NONE" And Items.Size > 0
Ameded error with DrawOuterFrame
Ameded an error for B4i (SubExists is different in B4i)

EDIT: 2018.07.30 Version 2.1
Added the NbXIntervals property
Added the SnapShot property
Added the Rotation property
Added the DrawOuterFramw property
Added a clip function to avoid lines being drawn outsides the grid
Added a Touch event for YXCharts returning the X and Y coordinates of the cursor

EDIT: 2018.07.19 Version 2.0
Added XSclaMnValue and XSclaMaxValue properties

EDIT: 2018.07.14 Version 1.9
Modified the data structure for YXChart to allow lines with different number of points.

EDIT: 2018.07.12 Version 1.8
Added RemovePointData(Index)
Added NbPoints property
Added dynamic chart example in the B4J project, the same is possible in B4A and B4i.

EDIT: 2018.05.21 Version 1.7
Added YXChart
Added a line for the mean value in single bar charts
You need to open and save the layout file again for projects with a previous version.

EDIT Version 1.6 hadn't been published
adapted the code with the new features of B4A V8.30+, B4i V 5.00+ and B4J V6.30+
use of the BitmapCreator library instead of the class
use of the Touch event of a B4XView and xui.Scale

EDIT: 2018.05.21 Version 1.5
Amended some bugs.
Changed the color properties from native colors to xui colors.
Added the YZeroAxis property.
Improved NumberFormat3 routine

EDIT: 2018.05.11 Version 1.4
Changed the TextColor property to TitleTextColor property.
Added gradient colors

EDIT: 2018.04.29 Version 1.2
Amended the ScaleTextColor not working, reported in post#47

EDIT: 2018.04.27 Version 1.1
Amended some bugs.
Added different line widths.
Added line point symbols.
Added display of values.

xCharts

Author: Klaus CHRISTL (klaus)
Version: 6.7

xChart
- Events:
  - CursorTouch (Action As Int, CursorIndex As Int)
  - Touch (X As Double, Y As Double)
- Fields:
  - xBase As B4XView
  - Items As List
  - Points As List
- 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 !
  - 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, Filled 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 !
  - 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 !
  - 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, Filled 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
  - DesignerCreateView (Base As Object, Lbl As Label, Props As Map) As String
  - DrawChart
    draws a chart
  - DrawEmptyChart
    Draws an empty chart with the current background color.
  - Initialize (Callback As Object, EventName As String) As String
  - IsInitialized As Boolean
    Tests whether the object has been initialized.
  - 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
  - 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
- Properties:
  - 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
  - ChartBackgroundColor
    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
  - 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.
  - 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.
  - 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
    sets the GridColor property
    the color must be an xui.Color
    Example code: <code>xChart1.GridColor = xui.Color_RGB(169, 169, 169)</code>
  - GridFrameColor
    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
  - 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
  - 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
    sets the single line chart MaxLineColor property
    the color must be an xui.Color
    Example code: <code>xChart1.MaxLineColor = xui.Color_Red</code>
  - MeanLineColor
    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
    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>
  - 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
  - PieStartAngle As Int
    gets or sets the PieStartAngle property
    default value = 0 (three o'clock), positive clockwise
    twelve o'clock = -90
  - PiePercentageNbFractions As Int
    gets or sets the number of fractions for pie percentage values
    min = 0 max = 2
  - 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.
  - Rotation As Double
    gets or sets the Rotation property of the Chart
    rotates the entire chart
  - 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
    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
  - 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
  - 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
  - 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
    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
    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
    gets or sets the YXChartDisplayCrossHair property, only for YX_CHARTs.
    True = displays cross hair lines at the cursor position.
  - YXChartDisplayPosition
    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
    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

Erel · Apr 13, 2018

Excellent work!

I've edit the title to make it a "cross platform" thread.

Johan Hormaza · Apr 13, 2018

Thanks @Erel and @klaus extremely great !!!

tufanv · Apr 13, 2018

Thanks it is great ! Just a little advice , if possible , can you add gradient color selection to coloring the charts , it may seem a little thing but it changes the visuals of the graphs very much.

Erel · Apr 13, 2018

tufanv said:
can you add gradient color selection to coloring the charts , it may seem a little thing but it changes the visuals of the graphs very much.

I was also thinking about it. Next week I will add a class that makes it simple to create cross platform gradients with BitmapCreator.

klaus · Apr 13, 2018

tufanv said:
... can you add gradient color selection to coloring the charts ...

What is the prupose of gradiend colors ?
If it is to make the gradient colors in relation with the values, this would make sense for single bar charts.

LucaMs · Apr 13, 2018

Great Klaus (note: not "Great job, Klaus"

)

Germán Arduino · Apr 13, 2018

Very nice! I'm developing a web system with php and code igniter and really would like to have these sort of tools there. But well, I will use when develop the mobile version

tufanv · Apr 13, 2018

klaus said:
What is the prupose of gradiend colors ?
If it is to make the gradient colors in relation with the values, this would make sense for single bar charts.

no it is just for a better visual . When you compare a single color filled pie chart to a gradient color chart , you can see that the gradient pie chart gives a better feeling of depth than regular color charts. For example: https://github.com/flot/flot/pull/853

AS I said earlier it is just for better visuals.

MarcoRome · Apr 14, 2018

Big Thanks Klaus

klaus · Apr 14, 2018

I am 'old fashioned', I would never had thought about gradient colors for visual purpose.
I am much more concentrated on the values rather the aesthetics.
BTW, I would never use a donut chart, like the one in your link.

LucaMs · Apr 14, 2018

klaus said:
BTW, I would never use a donut chart, like the one in your link.

And these?

klaus · Apr 14, 2018

During programming, why not, but their lifetime would be very short.

tufanv · Apr 15, 2018

klaus said:
New
I am 'old fashioned', I would never had thought about gradient colors for visual purpose.
I am much more concentrated on the values rather the aesthetics.
BTW, I would never use a donut chart, like the one in your link.

I totally respect that

Why I advised it is because I know your graph lib is a very powerful one with the values or on programming basis but the "feeling" of the apps are in visuals, I always had to use a webview to display charts from charts.js for example because when I use a graph lib I find here on the forum, it looks a little bit 'old fashioned" as you call

anyways , it is your lib I just said it would be good if it is easy for you to add

Thanks for the great lib

klaus · Apr 15, 2018

tufanv said:
I just said it would be good if it is easy for you to add

I am always open for constructive suggestions.
I will wait for Erels' cross platform gradients with BitmapCreator and look what could be done.

tufanv · Apr 15, 2018

Thanks Klaus !

klaus said:
I am always open for constructive suggestions.
I will wait for Erels' cross platform gradients with BitmapCreator and look what could be done.

Tadeu Botelho · Apr 15, 2018

Many thanks, Klaus !!!
What a wonderful contribution.
It will be very useful for an application that I am developing to keep up with the progress of the company!

Levit · Apr 16, 2018

That's Great work!
Thank you Klaus, that is very useful !

Anser · Apr 16, 2018

Looks really great. Thank you Klaus.

Will I be able to use this in ABMaterial ?

klaus · Apr 16, 2018

Will I be able to use this in ABMaterial ?

I don't know, I have never used ABMaterial.

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

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