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TRSChartHeader Class

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Implements the properties and methods necessary to display a header or footer in a chart panel. This includes properties such as Text and Font. The TRSChartHeader class extends the FMX.RS.ChartPanel.TRSChartImageArea class and redefines the Draw method to properly draw a header or footer.

Namespace: FMX.RS.ChartPanel

TInterfacedPersistent
FMX.RS.ChartPanel.TRSChartGraphic
FMX.RS.ChartPanel.TRSChartGraphicArea
FMX.RS.ChartPanel.TRSChartImageArea
FMX.RS.ChartPanel.TRSChartHeader

Delphi

type
TRSChartHeader = class(TRSChartImageArea)
end;

	Name	Description
	Create(TRSCustomChartPanel,Boolean)	Overloaded. Initializes a new instance of the TRSChartHeader class.
	Destroy	Represents the destructor of the TRSChartHeader class. (Overrides FMX.RS.ChartPanel.TRSChartImageArea.Destroy.)

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	Name	Description
	Alignment	Specifies how the Text is aligned within the header. The following are possible values of TAlignment:
taLeftJustify	Text is left-justified: Lines all begin at the left edge of the header
taCenter	Text is centered in the header
taRightJustify	Text is right-justified: Lines all end at the right edge of the header

Angle

Controls the angle in degrees at which the Text is rotated within the header. Specify an angle between 0 and 359 for the rotation. An angle of 0 specifies a normal text label while an angle of 90 specifies a text label drawn complete rotated on its side.

Brush

Represents property Brush.

Font

Specifies the font used to draw each header's Text. Set Font to specify the font to use for writing text. The value of Font is a TFont object. Set the properties of the TFont object to specify the font face, color, size, style, and any other aspects of the font (except for the Angle or rotation).

FontFill

Height

Specifies the height in pixels of the chart header. It specifies the height of the rectangle that contains the chart header or footer in the chart panel. The height cannot be smaller than the Font's height.

Image

Represents property Image.

ImageOptions

Represents property ImageOptions.

IsHeader

Represents property IsHeader.

OnChange

Occurs immediately after the chart graphic object changes. Write an OnChange event handler to take specific action when the chart graphic changes. The properties of the chart graphic reflect the new settings when OnChange occurs.

Warning
For chart graphics that a chart or chart panel creates, you shouldn't assign a handler to this event. The chart or chart panel has already assigned an event handler.

Opacity

Represents property Opacity.

Pen

Represents property Pen.

Text

Specifies the text, or title caption, of the header or footer. This is the text actually written in the chart header

Visible

Represents property Visible.

Width

Specifies the width in pixels of the chart header. It specifies the width of the rectangle that contains the chart header or footer in the chart panel.

Note
At this time, this property is ignored.

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Name

Description

Assign(TPersistent)

Copies the contents of another similar object to the current object

Notes to Inheritors
Most objects override Assign to handle the assignment of properties from similar objects. When overriding Assign, call the inherited method if the destination object cannot handle the assignment of properties from the class of the Source parameter

Changed

Overloaded. Represents method Changed. (Inherited from FMX.RS.ChartPanel.TRSChartGraphic.)

Clone

Creates a "deep" copy of the chart graphic. It constructs a new chart graphic of the correct type and then calls the Assign method to copy its properties to the new copy. (Inherited from FMX.RS.ChartPanel.TRSChartGraphic.)

DestRect(TCanvasRect)

Represents method DestRect(TCanvasRect). (Inherited from FMX.RS.ChartPanel.TRSChartImageArea.)

Draw(TCanvas,TCanvasRect)

Overloaded. Paints the chart graphic to the specified Canvas in the specified location. It uses the current canvas' brush and pen. Use the Draw method to paint the chart graphic to any canvas and anywhere and with any size on the canvas.

Notes to Inheritors
Descendant classes of TRSChartGraphic override the InternalDraw method to actually paint themselves.

Draw(TCanvas,TCanvasRect,TRSChartAxis,TRSChartAxis)

The VertAxis and HorizAxis parameters can be used to provide point to pixel conversions (see FMX.RS.ChartPanel.TRSChartAxis ).

Notes to Inheritors
Descendant classes of TRSChartGraphic override the InternalDraw method to actually paint themselves.

Drawing(TCanvas,TCanvasRect)

Represents method Drawing(TCanvas,TCanvasRect). (Overrides FMX.RS.ChartPanel.TRSChartGraphicArea.Drawing(TCanvas,TCanvasRect).)

Drawn(TCanvas,TCanvasRect)

Represents method Drawn(TCanvas,TCanvasRect). (Inherited from FMX.RS.ChartPanel.TRSChartGraphic.)

FreeNotification(TObject)

Represents method FreeNotification(TObject). (Inherited from FMX.RS.ChartPanel.TRSChartGraphic.)

Initialize

Represents method Initialize. (Overrides FMX.RS.ChartPanel.TRSChartImageArea.Initialize.)

InitializeEvents

Represents method InitializeEvents. (Overrides FMX.RS.ChartPanel.TRSChartImageArea.InitializeEvents.)

InternalDraw(TCanvas,TCanvasRect)

Represents method InternalDraw(TCanvas,TCanvasRect). (Overrides FMX.RS.ChartPanel.TRSChartImageArea.InternalDraw(TCanvas,TCanvasRect).)

SenderChanged(TObject)

Represents method SenderChanged(TObject). (Overrides FMX.RS.ChartPanel.TRSChartImageArea.SenderChanged(TObject).)

TiledDraw(TCanvas,TCanvasRect,TTileGraphic,TCanvasPixel,TCanvasPixel)

Overloaded. Tiles the image across the entire input rectangle.

The Image is drawn at full size from the top left of the ARect across and down until outside of the input rectangle. Use the overloaded TiledDraw methods to constrain the size of the Image.

TiledDraw(TCanvas,TCanvasRect,TTileGraphic,TCanvasPixel,TCanvasPixel,TCanvasPixel,TCanvasPixel)

Overloaded. Tiles the image across the entire input rectangle.

The Image is drawn at ImageWidth, ImageHeight size from the top left of the ARect across and down until outside of the input rectangle.

TiledDraw(TCanvas,TCanvasRect,TTileGraphic,TCanvasRect)

Overloaded. Tiles the image across the entire input rectangle.

The Image is drawn at ImageRect size from the top left of the ARect across and down until outside of the input rectangle.

VisibleChanged

Represents method VisibleChanged. (Overrides FMX.RS.ChartPanel.TRSChartImageArea.VisibleChanged.)

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	Name	Description
	OnDraw	Occurs just after the chart graphic is painted. Write an OnDraw event handler to take specific action when the chart graphic has finished painting. The OnDraw event also allows you to do custom painting after the chart graphic has painted. (Inherited from FMX.RS.ChartPanel.TRSChartGraphic.)
	OnDrawing	Occurs just before the chart graphic is painted. Write an OnDrawing event handler to take specific action when the chart graphic is about to paint. If the event handler sets the DoDraw parameter to False, the chart graphic will not be painted. The OnDraw event also allows you to do custom painting before the chart graphic has been painted. (Inherited from FMX.RS.ChartPanel.TRSChartGraphic.)

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Reference

•	FMX.RS.ChartPanel.TRSCustomChartPanel.Footer

•	FMX.RS.ChartPanel.TRSCustomChartPanel.Header

•	FMX.RS.ChartPanel.TRSChartPanel

•	FMX.RS.ChartPanel

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