B4J Library [B4X] [XUI] xChartMini b4xlib

Current version : 1.1

xChartMini is a b4xlib library, it is a minimalist version of the xChartLite library which is a lite version of the full xChart library.

It has automatic scales, which can also be set manually.
Automatic text size according to the chart size.

I am convinced that many user do not need all kind of different possible charts and settings.
The size of the code is a little bit more than the half of the xChartLite version and about one fifth of the full version.

Supported charts:
- Bar
- Stacked bar
- Lines

The demo project is a B4XPages project using the xChartMini library.
Tested on PC, Android Samsung S10, Samsung Tab S2, iPhone 8 and iPad.
xChartMiniDemoV1_0.zip B4XPages cross platform project using the xChartMini library.
xChartMini.b4xlib The xChartMini B4X library file. You must copy it into your your AdditionalLibraries\B4X folder.
xChartMini.xml Help file, it is useful with the B4X Help Viewer or the B4XObjectBrowser.
Don’t copy the xChartMini.xml file to the AdditionalLibraries folder!

EDIT: 2023.11.14 Version 1.1
Added check of chart incompatibilities
Amended AutomaticScales with only one point

xChartMini

Author: Klaus CHRISTL (klaus)
Version: 1.1

• xChartMini
  • Events:
    • CursorTouch (Action As Int, CursorPointIndex As Int)
      Action, same as the Panel Touch event.
      CursorPointIndex, is the index of the point at the current cursor position.
  • Fields:
    • mBase 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 !
    • 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 !
    • 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
    • ClearPoints
      clears all points, not the title nor axis names
    • DrawChart
      draws a chart
    • 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.
    • 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
    • RemovePointData (Index As Int) As String
      removes the data of the point with the given index
  • 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
    • AxisTextColor As Int
      gets or sets the AxisTextColor property
    • 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, STACKED_BAR
    • 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>
    • Height As Int
      gets or sets the Height property
    • IncludeLegend As String
      gets or sets the IncludeLegend property
      possible values: NONE, TOP_RIGHT, BOTTOM
    • 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
    • NbPoints As Int [read only]
      gets the number of points (read only)
    • 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
    • ScaleTextColor As Int
      sets the ScaleTextColor property
      the color must be an xui.Color
      Example code: <code>xChart1.ScaleTextColor = xui.Color_Blue</code>
    • 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
    • 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>
    • 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>
    • Top As Int
      gets or sets the Top property
    • 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
    • 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
    • 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
    • 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

 

[Chris2]

Nice work, again @klaus !
Small typo, possibly;

The size of the code is a little bit more than the half of the xChartMini version....

Should that be: "....half of the xChartLite version....." ?

 

[klaus]

Thank you, amended.

 

[Mahares]

You may want to remove the list of xCharts that are not supported from the 'Properies' section of your first post, since you mention in the summary that only Bar, Stacked bar, Lines are supported.

 

[klaus]

Thank you for reporting this. Amended.

 

[zed]

Hi,
Yeah, that's awesome.
I racked my brains for several days on the full version and only need to show the "BARS" part.
What happiness...
Thank you so much

 

[klaus]

The library has been updated to Version 1.1
Added check of chart incompatibilities
Amended AutomaticScales with only one point