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

TRSSparseBarChartValues Class

Defines the collection of all bars in a sparse bar chart (i.e., bars do not need to be right next to each other). A bar chart is made up of a collection of bars ( FMX.RS.BarCharts.TRSSparseBarChartValue ), where each TRSSparseBarChartValue defines the information for one bar for the chart. The TRSSparseBarChartValue class defines the common properties to all bars, including X, Value, Caption, and Color. The TRSSparseBarChartValues collection defines the common properties to all bar values, such as DimensionCount, MaxValues, and MinValues.

Note that the TRSSparseBarChartValues collection provides built-in support for limiting the number of values in the collection (using the Limit property).

Namespace: FMX.RS.BarCharts

	Name	Description
	Create(TRSCustomChart,TRSChartValueClass)	Initializes a new instance of the TRSSparseBarChartValues class. (Overrides FMX.RS.ChartPanel.TRSChartValues.Create(TRSCustomChart,TRSChartValueClass).)

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Name

Description

public property

AbsSum

Returns the sum of the absolute values of the first dimension of the values in the chart. The AbsSums property returns the absolute sum for any dimension in the chart (see DimensionCount for more details).
(Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public property

AbsSums[Integer]

Returns the summation of the absolute values for every dimension of the TRSChartValues in the chart. Use the DimensionCount property to determine the number of dimensions in the chart value collection. This property is part of the metadata that the collection tracks about the chart values.

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. See the Values and ValueCount properties of the TRSChartValue item for more information.

published property

DateTimeAxes

Specifies the axes that should be considered datetime values. The property controls which dimensions should be labeled as a date time or a regular floating point number. When this property includes an axis, all the labels for the chart will be drawn as a Date + Time (controlled by the DateTimeFormat of the axis).

public property

DefaultDimension

Returns the Values dimension that contains the default dimension or key dimension, i.e., the dimension that is most important to a chart. For 1D charts, like a pie chart, this value is 0. For 2D charts, this dimension is usually 1.

Use the TimeDimension and the DefaultDimension to find out the "important" dimensions of the TRSChartValue descendant.

Note
The FMX.RS.ChartPanel.TRSChartValue.Value property uses this property to figure out which Values dimension to get or set.

public property

DimensionCount

Returns the number of dimensions each Value ( FMX.RS.ChartPanel.TRSChartValue ) will have in the chart.

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 number of dimensions in a chart is defined when the TRSChartValues collection is created. Every time a TRSChartValue item is created, its Values property will be initialized to the size of DimensionCount.

protected property

DoNotNotify

Represents property DoNotNotify. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected property

HasCaptions

Specifies that at least one TRSChartValue in the collection has had a Caption assigned to it. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public property

IsDateTime

Controls whether the first (or only) dimension should be labeled as a date time or a regular floating point number. When this property is set to True, all the labels for this chart will be drawn as a Date + Time (controlled by the DateTimeFormat of the axis).
(Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public property

Items[Integer]

Lists the values in the chart. Use Items to access individual value in the collection. The value of the Index parameter corresponds to the Index property of FMX.RS.ChartPanel.TRSChartValue . It represents the position of the value in the collection.

The Items property is the default property for the class. You can access this property with the abbreviation Values[index], which is equivalent to Values.Items[index].

published property

Limit

Limits the number of values (or FMX.RS.ChartPanel.TRSChartValue items) in the collection. It provides the chart the ability to limit its size automatically as values are added.

Once the Count property equals the Limit property, every time you Add another value, the 0-th value is deleted. This property makes it easy to ensure your chart values do not grow unbounded and creates an automatic sliding window display ofthe Limit number of points. Note that this is not necessarily the last Limit number of points added, as sorting the values (Sorted) can make which value is deleted unpredictable.

If you want an unlimited number of chart values, set Limit to RSChartConsts|NoLimit .

public property

MaxValue

Returns the maximum value of the first dimension of the values in the chart. The MaxValues property returns the maximum value for any dimension in the chart (see DimensionCount for more details).
(Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public property

MaxValues[Integer]

Returns the maximum value for every dimension of the TRSChartValues in the chart. Use the DimensionCount property to determine the number of dimensions in the chart value collection. This property is part of the metadata that the collection tracks about the chart values.

public property

MinValue

Returns the minimum value of the first dimension of the values in the chart. The MinValues property returns the maximum value for any dimension in the chart (see DimensionCount for more details).
(Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public property

MinValues[Integer]

Returns the minimum value for every dimension of the TRSChartValues in the chart. Use the DimensionCount property to determine the number of dimensions in the chart value collection. This property is part of the metadata that the collection tracks about the chart values.

protected property

NeedMetaUpdate

Signals that metadata is out of date and needs to be recalculated by calling the CalculateMetaData method (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected property

NumDimensions

Specifies the number of dimensions the TRSChartValue's have. The number of dimensions specify the size of the TRSChartValue.Values property and corresponds to all the floating point properties of a value (e.g., X, Y, Z, Width, Height, Size, etc). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public property

SelCount

Returns the number of selected values in the collection (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

published property

SortByDimension

Represents property SortByDimension.

published property

Sorted

Controls whether the values of the chart are sorted or not.

Set the Sorted property to True to force all values to be sorted in the collection based on the SortByDimension and SortOrder properties. When this property is False, the values are in the order that they were added or inserted into the collection (see Add or Insert methods).

published property

SortOrder

Controls whether the items are sorted in ascending or descending order. The FMX.RS.ChartPanel.TRSChartValues.SortByDimension property controls which values are used to do the sorting. The FMX.RS.ChartPanel.TRSChartValues.Sorted property controls whether the items will be sorted at all. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public property

Sum

Returns the summation of the first dimension of the values in the chart. The Sums property returns the summation for any dimension in the chart (see DimensionCount for more details).
(Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public property

Sums[Integer]

Returns the summation of the values for every dimension of the TRSChartValues in the chart. Use the DimensionCount property to determine the number of dimensions in the chart value collection. This property is part of the metadata that the collection tracks about the chart values.

public property

TimeDimension

Returns the Values dimension that contains the time/x/horizontal dimension. For 1D charts, like a pie chart, this value is unassigned (DIMENSION_UNASSIGNED). For 2D charts, this dimension is usually 0.

Use the TimeDimension and the DefaultDimension to find out the "important" dimensions of the TRSChartValue descendant.

public property

VisibleCount

Returns the number of visible values in the collection ( Visible = True) (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

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Name

Description

public method

Add

Overloaded. Creates a new FMX.RS.BarCharts.TRSSparseBarChartValue instance and adds it to the Items array. Call Add to create a bar value in the collection. The new value is placed at the end of the Items array, or, if the collection is Sorted, placed at the sorted point in the collection (based on a default value (0)).

Add returns the new bar value.

Note that because every time you change a value an event is called, it is faster to add and initialize a value using the overloaded Add method.

public method

Add(TRSChartValueType,String,TCanvasColor)

Overloaded. Creates a new FMX.RS.BarCharts.TRSSparseBarChartValue instance and adds it to the Items array. The new instance is initialized with the Value, Caption, and Color parameters. The X property is set to the maximum of all the previous values. Call Add to create a bar value in the collection. The new value is placed at the end of the Items array, or, if the collection is Sorted, placed at the sorted point in the collection (based on a default value (0)).

Add returns the new bar value.

public method

Add(TRSChartValueType,String,TCanvasColor,Integer)

Overloaded. Creates a new FMX.RS.BarCharts.TRSBarChartValue instance and adds it to the Items array. The new instance is initialized with the Value, Caption, Color, and ImageIndex parameters. The Value parameter is assigned to the first dimension of the TRSBarChartValues.Values property. Call Add to create a bar value in the collection. The new value is placed at the end of the Items array, or, if the collection is Sorted, placed at the sorted point in the collection (based on a default value (0)).

Add returns the new bar value.

public method

Add(TRSChartValueType,TRSChartValueType,String,TCanvasColor)

Overloaded. Creates a new FMX.RS.BarCharts.TRSSparseBarChartValue instance and adds it to the Items array. The new instance is initialized with the X, Y, Caption, and Color parameters. Call Add to create a bar value in the collection. The new value is placed at the end of the Items array, or, if the collection is Sorted, placed at the sorted point in the collection (based on a default value (0)).

Add returns the new bar value.

public method

Add(TRSChartValueType[],String,TCanvasColor)

Overloaded. Creates a new TRSChartValue instance and adds it to the Items array. The new instance is initialized with the Values, Caption, and Color parameters. Call Add to create a value in the collection. The new value is placed at the end of the Items array, or, if the collection is Sorted, placed at the sorted point in the collection (based on a default value (0)).

Add returns the new value.

public method

Append(TRSChartValues)

Appends the Source values to the current collection (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public method

Assign(TPersistent)

Represents method Assign(TPersistent). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

AssignTo(TPersistent)

Represents method AssignTo(TPersistent). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

CalculateMetaData

Calculates the metadata (e.g., minimums, maximums, summations, and absolute summations) for the entire values collection, for all dimensions.

The metadata is recalculated when values change and the NeedMetaData property is set to true.

public method

Clone

Creates a copy of the values collection. This is a "deep" copy, e.g., all items and their properties are copied. The new collection is returned. The Owner of the collection is the same as the current collection's Owner . Note, you are responsible for freeing the clone. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public method

CustomSort(TValuesSortCompare)

Sorts the current values collection using the supplied comparison function. Use CustomSort when you want to perform a special type of sorting on the values collection. You need to define a function based on the FMX.RS.ChartPanel.TValuesSortCompare signature.

If you want to do normal sorting, just call the Sort method.

public method

FindClosest(TRSChartValueType)

Returns the Index of the Item that is closest to the Value parameter. FindClosest uses the Values in the sorted dimension ( SortByDimension) to determine the nearest value. If the collection is not sorted, this function returns -1. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public method

FindItemID(Integer)

Returns the Item with the specified ID. The FindItemID method returns the item in the collection whose ID property is passed to it as a parameter. If no item has the specified ID, FindItemID returns nil.

protected method

GetAbsSum(Integer)

Represents method GetAbsSum(Integer). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public method

GetAxisMaximum(Integer)

Returns the maximum value in the collection for the specified dimension. (Overrides FMX.RS.BarCharts.TRSBarChartValues.GetAxisMaximum(Integer).)

public method

GetAxisMinimum(Integer)

Returns the minimum value in the collection for the specified dimension. (Overrides FMX.RS.BarCharts.TRSBarChartValues.GetAxisMinimum(Integer).)

public method

GetEnumerator

Returns the enumerator for the collection, which is used when you write a "for Item in Chart.Values" loop.

protected method

GetIsDateTime

Represents method GetIsDateTime. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

GetMaxValue(Integer)

Represents method GetMaxValue(Integer). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

GetMinValue(Integer)

Represents method GetMinValue(Integer). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

GetSortByDimension

Represents method GetSortByDimension. (Overrides FMX.RS.ChartPanel.TRSChartValues.GetSortByDimension.)

protected method

GetSum(Integer)

Represents method GetSum(Integer). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

GetValueDimMaximum(TRSChartValue,Integer)

Returns the maximum value for the dimension. This may be modified by other values. For example, the shape value modifies the X value by adding the width value. This method is called by the CalculateMetaData method.

alert_note Notes to Inheritors

Override this method if you need to return a maximum value for a dimension that is depends on other factors than just the value in TRSChartValue.Values[Dimension]. For example, the TRSCandleStickChartValues class overrides this method for the Y dimension because the Y dimension is bounded by the High Dimension and Low Dimension, not the Close value.

You will probably also need to override the SetMetaData method to set the new maximum.

protected method

GetValueDimMinimum(TRSChartValue,Integer)

Returns the minimum value for the dimension. This may be modified by other values. For example, the shape value modifies the X value by adding the width value. This method is called by the CalculateMetaData method.

alert_note Notes to Inheritors

Override this method if you need to return a minimum value for a dimension that is depends on other factors than just the value in TRSChartValue.Values[Dimension]. For example, the TRSCandleStickChartValues class overrides this method for the Y dimension because the Y dimension is bounded by the High Dimension and Low Dimension, not the Close value.

You will probably also need to override the SetMetaData method to set the new minimum.

public method

IndexOf(TRSChartValueType,Integer)

Returns the Index of the Item that contains the Value parameter (or close to the Value parameter) for the specifed Dimension. If the Collection is sorted by the specified Dimension, IndexOf calls the FindClosest method. However, if the collection is not sorted or not sorted by the specified Dimension, the method iterates through the collection looking for a value that is approximately equal to the specified Value. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public method

Insert(Integer)

Creates a new instance and adds it to the Items array. Call Insert to add a new value at a specified position in the collection. Existing items (starting from the specified position) are moved up in the Items array. Note that Insert only works as expected if the collection is not Sorted.

Insert returns the new collection value.

protected method

Loaded

Represents method Loaded. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

Notify(Classes,Classes)

Represents method Notify(Classes,Classes). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public method

Owner

Returns the chart that owns the values

protected method

QuickSort(Integer,Integer,TValuesSortCompare)

Represents method QuickSort(Integer,Integer,TValuesSortCompare). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public method

SelectAll

Selects all values in the collection (TRSChartValue.Selected is set to true) (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

SelectionChanged(TRSChartValue)

Represents method SelectionChanged(TRSChartValue). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

public method

SelectNone

Deselects all values in the collection (TRSChartValue.Selected is set to false) (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

SetCount(Integer)

Represents method SetCount(Integer). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

SetIsDateTime(Boolean)

Represents method SetIsDateTime(Boolean). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

SetMetaData(TValueMetaData,TRSChartValue,Integer)

Sets the metadata (min, max, sum, etc) by using the TRSChartValue.Values property. The Dimension parameter specifies the dimension to use in the Values property. This method is called by the CalculateMetaData method when it finds a value "better" than the current metadata value (e.g., less than current minimum)

Notes to Inheritors
This method is often overridden when you need to override the GetValueDimMinimum and GetValueDimMaximum methods.

public method

Sort

Sorts the current values collection based on the SortByDimension. You can do custom sorts by using the CustomSort method. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

Update(TCollectionItem)

Represents method Update(TCollectionItem). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

ValueChanged(TRSChartValue,Integer)

Represents method ValueChanged(TRSChartValue,Integer). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

protected method

VisibleChanged(TRSChartValue)

Represents method VisibleChanged(TRSChartValue). (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

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	Name	Description
	FAbsSum	Represents field FAbsSum. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)
	FDefaultDimension	Represents field FDefaultDimension. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)
	FDiff	Represents field FDiff.
	FMaxValue	Represents field FMaxValue. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)
	FMinValue	Represents field FMinValue. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)
	FSum	Represents field FSum. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)
	FTimeDimension	Represents field FTimeDimension. (Inherited from FMX.RS.ChartPanel.TRSChartValues.)

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