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Navigation: Code Documentation > RSFMXCharts > FMX.RS.BubbleCharts > Classes

TRSBubbleChartValue Class

Extends the FMX.RS.Charts.TRS2DImageChartValue class to provide the properties and methods needed to describe one bubble of the TRSBubbleChart component. The TRSBubbleChartValue class uses the Size property to specify the size of the bubble. The size of the bubbles can represent the area of the bubbles or the diameter of the bubble (controlled by the SizeOption property of FMX.RS.BubbleCharts.TRSBubbleChartValues ), which affects the relative size of one bubble to another.

Bubble sizes can be negative values, although negative bubbles do not display in the chart by default ( NegativeSizeVisible must be true). When negative bubble sizes are displayed, they use their absolute size and are always drawn using the NegativeSizeColor.

Important Note
Note that for drawing purposes, the bubble size is proportional to the greatest bubble size in the collection of bubbles. Only the largest bubble is drawn with its correct diameter or area.

Namespace: FMX.RS.BubbleCharts

Name

Description

published property

AsDateTime

Provides access to the Value property as a TDateTime value.

Notes to Inheritors
Usually this property provides access to the first dimension (X) of the value array. However, descendant classes can change which dimension this property accesses.

public property

AsDateTimes[Integer]

Represents property AsDateTimes[Integer]. (Inherited from FMX.RS.ChartPanel.TRSChartValue.)

published property

Caption

Provides a caption or description of the chart value. This value will only be drawn if coLabelEachPoint is in the chart's Options property. (Inherited from FMX.RS.ChartPanel.TRSChartValue.)

public property

Collection

Specifies the TRSBubbleChartValues instance to which this Item belongs. Each TRSBubbleChartValue belongs to the TRSBubbleChartValues collection which creates it. The Collection property points to the collection object to which the value belongs.

published property

Color

Specifies the color of this individual value, e.g., the color of the bar or the point or the shape. When coColorEachPoint is in the FMX.RS.ChartPanel.TRSCustomChart.Options property, this color is drawn by the chart. When coColorEachPoint is not in the the Options property, the Color of the chart is used. (Inherited from FMX.RS.ChartPanel.TRSChartValue.)

published property

ImageIndex

Specifies the index of the image to use when drawing the point/image. When the FMX.RS.Charts.TRSPointChart component draws this point, it will use the specified image from its ImageList. The image is stretched to fit the PointsInfo width and height. To not use an image, set ImageIndex to -1. (Inherited from FMX.RS.Charts.TRS2DImageChartValue.)

published property

Opacity

Specifies the opacity of the value when drawn. The opacity is a value between 0 (invisible) and 1 (fully opaque). Any value in-between controls the transparency of the value.

Important Note
This is an FMX only feature. Any value > 0 is drawn fully opaque in the VCL version

protected property

Options

Represents property Options. (Inherited from FMX.RS.ChartPanel.TRSChartValue.)

published property

Scale

Specifies the scale factor for the value. A scale factor of 1 (default) draws the value at its normal size within the chart. Change the scale factor to shrink or grow the value within the chart (for drawing purposes only) (Inherited from FMX.RS.ChartPanel.TRSChartValue.)

public property

Selected

Determines whether the chart value is selected. Use the Selected property to select or deselect a chart value. Selected chart values are displayed with the SelectionColor of the chart panel.
(Inherited from FMX.RS.ChartPanel.TRSChartValue.)

published property

Size

Returns the size of the bubble as a diameter or an area. The size of the bubbles can represent the area of the bubbles or the diameter of the bubble (controlled by the SizeOption property of TRSBubbleChartValues), which affects the relative size of one bubble to another.

Bubble sizes can be negative values, although negative bubbles do not display in the chart by default ( NegativeSizeVisible must be true). When negative bubble sizes are displayed, they use their absolute size and are always drawn using the NegativeSizeColor.

Important Note
Note that for drawing purposes, the bubble size is proportional to the greatest bubble size in the collection of bubbles. Only the largest bubble is drawn with its correct diameter or area.

published property

Tag

Provides user-defined storage that is associated with the value (Inherited from FMX.RS.ChartPanel.TRSChartValue.)

published property

Value

Returns the main (or only) dimension in a chart value - which dimension is returned is based on the chart type. A chart value, depending on the chart type, can contain 1 or more dimensional values that define the chart value.

For example, each chart value in a bar chart contains 1 value (defining the height of the bar), line chart values contains 2 dimensions: X and Y, and shape chart values contain 4 dimensions: X, Y, Width, and Height. The ValueCount property returns the number of dimensions in the chart value. Use the Values property to access each dimension in the chart value (Note that TRSChartValue descendant classes expose properties, such as X and Y, which are safer to access the specific dimension of the value. You should not count on a specific dimension index to contain a specific property).

Notes to Inheritors
To change which dimension is returned by this Value, override the GetDefValue and SetDefValue methods

public property

ValueCount

Returns the number of dimensions in the chart value. A chart value, depending on the chart type, can contain 1 or more dimensional values that define the chart value.

Use the Values property to access each dimension in the chart value. The Value property in comparison returns the main (or only) dimension in a chart value - which dimension is returned is based on the chart type.

Caution
Note that TRSChartValue descendant classes expose properties, such as X and Y, which are safer to access the specific dimension of the value. You should not count on a specific dimension index to contain a specific property

public property

Values[Integer]

Returns the value for the dimension in the chart value. A chart value, depending on the chart type, can contain 1 or more dimensional values that define the chart value.

Caution
Note that TRSChartValue descendant classes expose properties, such as X and Y, which are safer to access the specific dimension of the value. You should not count on a specific dimension index to contain a specific property

The ValueCount will equal the DimensionCount of the collection.

published property

Visible

Determines whether the chart value is visible or not. Use the Visible property to change the visibility of the chart value. Even if the Visible property is True, the chart value may still not be visible if the chart axis is zoomed. (Inherited from FMX.RS.ChartPanel.TRSChartValue.)

published property

Represents property X. (Inherited from FMX.RS.Charts.TRS2DImageChartValue.)

public property

XAsDateTime

Represents property XAsDateTime. (Inherited from FMX.RS.Charts.TRS2DImageChartValue.)

published property

Represents property Y. (Inherited from FMX.RS.Charts.TRS2DImageChartValue.)

public property

YAsDateTime

Represents property YAsDateTime. (Inherited from FMX.RS.Charts.TRS2DImageChartValue.)

protected property

Provide access to the third dimension of the Values property formatted as a TDateTime. The XAsDateTime, YAsDateTime, and ZAsDateTime properties provide access to the first three dimensions of the Values property formatted as a TDateTime

alert_note Notes to Inheritors

These properties have protected visibility in the class, but descendant classes (e.g., RSCharts|TRS2DChartValue and TRS3DChartvalue ) publish the properties to provide more explanatory access to the dimensions of the Values property.

Remember to also publish the X, Y, and Z properties

protected property

ZAsDateTime

Provide access to the third dimension of the Values property. The X, Y, and Z properties provide access to the first three dimensions of the Values property.

Use the X, Y, and Z property to access the coordinates of a point.

alert_note Notes to Inheritors

Remember to also publish the XAsDateTime, YAsDateTime, and ZAsDateTime properties

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	Name	Description
	Assign(TPersistent)	Represents method Assign(TPersistent). (Overrides FMX.RS.ChartPanel.TRSChartValue.Assign(TPersistent).)
	GetAsDateTime(Integer)	Represents method GetAsDateTime(Integer). (Inherited from FMX.RS.ChartPanel.TRSChartValue.)
	GetDefValue	Returns the "default" value for the chart, e.g., Y for 2D charts. This method is called by the Value property. The GetDefValue and SetDefValue methods use the FMX.RS.ChartPanel.TRSChartValues.DefaultDimension to figure out which Values dimension to read and write.
	GetDisplayName	Represents method GetDisplayName. (Inherited from FMX.RS.ChartPanel.TRSChartValue.)
	GetIntValue(Integer)	Represents method GetIntValue(Integer). (Inherited from FMX.RS.ChartPanel.TRSChartValue.)
	GetValue(Integer)	Represents method GetValue(Integer). (Inherited from FMX.RS.ChartPanel.TRSChartValue.)
	Loaded	Represents method Loaded. (Inherited from FMX.RS.ChartPanel.TRSChartValue.)
	Radius	returns the Radius of the size depending on whether it is an area value or a diameter
	Selectable(TRSRect,TRSChartSelectionAction)	Returns true if the value is within the selection rectangle. Descendant classes override this method to signal whether the value is selected or not. (Overrides FMX.RS.Charts.TRS2DChartValue.Selectable(TRSRect,TRSChartSelectionAction).)
	Selectable(TRSRect,TRSRect,TRSChartSelectionAction)	Overloaded. Returns True if the Value should be selected. This depends on the Selected state and if the value rectangle intersects with the selection rectangle. (Inherited from FMX.RS.ChartPanel.TRSChartValue.)
	SelectionChanged	Represents method SelectionChanged. (Inherited from FMX.RS.ChartPanel.TRSChartValue.)
	SetAsDateTime(Integer,TDateTime)	Represents method SetAsDateTime(Integer,TDateTime). (Inherited from FMX.RS.ChartPanel.TRSChartValue.)
	SetColor(TCanvasColor)	Represents method SetColor(TCanvasColor). (Inherited from FMX.RS.ChartPanel.TRSChartValue.)
	SetDefValue(TRSChartValueType)	Sets the "default" value for the chart, e.g., X for 2D charts. This method is called by the Value property. Change the GetDefValue and SetDefValue methods for TRSChartValue descendants that don't have their default dimension as 0.
	SetIntValue(Integer,Integer)	Represents method SetIntValue(Integer,Integer). (Inherited from FMX.RS.ChartPanel.TRSChartValue.)
	SetValue(Integer,TRSChartValueType)	Represents method SetValue(Integer,TRSChartValueType). (Inherited from FMX.RS.ChartPanel.TRSChartValue.)
	ValueChanged(Integer)	Represents method ValueChanged(Integer). (Inherited from FMX.RS.ChartPanel.TRSChartValue.)
	ValuesToString(String,Boolean)	Returns a comma-delimited string of the floating-point values of the Value. The Fmt property specifies how to format the floating-point values (see FormatFloat function from Delphi's help). The Parentheses property controls if parentheses are put around the comma-delimited string. (Inherited from FMX.RS.ChartPanel.TRSChartValue.)
	VisibleChanged	Represents method VisibleChanged. (Inherited from FMX.RS.ChartPanel.TRSChartValue.)

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The following code adds 3 bubbles to the chart:

Delphi

var
   Value: TRSBubbleChartValue;  // note, this type should be the same that the chart uses (e.g., TRS2DChartValue, TRSArrowChartValue, etc)
begin
   RSBubbleChart1.SizeOption := boDiameter;
   // Add first bubble
   Value := RSBubbleChart1.Values.Add;
   Value.Color := clRed;
   Value.X := 10;
   Value.Y := 10;
   Value.Size := 100.0;
   // Add second point, twice the size of the first
   Value := RSBubbleChart1.Values.Add;
   Value.Color := clGreen;
   Value.X := 50;
   Value.Y := 100;
   Value.Size := 200.0;
   // Add third point, twice as large as second
   Value := RSBubbleChart1.Values.Add;
   Value.Color := clNavy;
   Value.X := 100;
   Value.Y := 25;
   Value.Size := 400.0;
end;

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