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TRSSVGImage Class

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TRSSVGImage displays a graphical image of an SVG. The control ensures that the image is always of the highest resolution by redrawing the SVG when the control is rescaled.

Use TRSSVGImage to display a graphical image of a SVG on a form. Use the SVGDocument and SVGRootID properties to control which SVG is displayed in the image. TRSSVGImage introduces several properties to determine how the SVG is displayed within the boundaries of the TRSSVGImage object.

Namespace: FMX.RS.SVGCtrls

Name

Description

Align

Represents property Align.

Anchors

Represents property Anchors.

Bitmap

Represents property Bitmap.

Buffered

Specifies whether to draw the SVG to a backbuffer and then copy that image to the canvas (default) or to draw directly on the canvas

Set the Buffered property to false to draw directly on the image canvas. This is generally not recommended, however, it may look better on mobile devices

ClipChildren

Represents property ClipChildren.

ClipParent

Represents property ClipParent.

Cursor

Represents property Cursor.

CursorTracking

Represents property CursorTracking.

DefaultCursor

Represents property DefaultCursor.

DesignVisible

Represents property DesignVisible.

DisableInterpolation

Enables or disables the interpolation of the SVG bitmap displayed by this TRSSVGImage component.

The DisableInterpolation property specifies whether the interpolation is used while rendering the SVG bitmap onto the canvas displayed by this TRSSVGImage component. By default, DisableInterpolation is set to False.

DragMode

Represents property DragMode.

Enabled

Represents property Enabled.

EnableDragHighlight

Represents property EnableDragHighlight.

FindOptions

Specifies how the control determines which svg element is at the mouse cursor

Height

Represents property Height.

HitTest

Represents property HitTest.

Locked

Represents property Locked.

Margins

Represents property Margins.

MarginWrapMode

Specifies how the margins of the SVG are resized, replicated, and positioned.

Use MarginWrapMode property to set and get how the margins of the SVG are displayed within the TRSSVGImage. By default the margins are stretched to fill the entire TRSSVGImage.

If SVGMargins property is not set, then MarginWrapMode has no effect over the image.

NeedBitmapUpdate

Represents property NeedBitmapUpdate.

OnClick

Represents property OnClick.

OnDblClick

Represents property OnDblClick.

OnDragDrop

Represents property OnDragDrop.

OnDragEnd

Represents property OnDragEnd.

OnDragEnter

Represents property OnDragEnter.

OnDragLeave

Represents property OnDragLeave.

OnDragOver

Represents property OnDragOver.

OnMouseDown

Represents property OnMouseDown.

OnMouseEnter

Represents property OnMouseEnter.

OnMouseLeave

Represents property OnMouseLeave.

OnMouseMove

Represents property OnMouseMove.

OnMouseUp

Represents property OnMouseUp.

OnMouseWheel

Represents property OnMouseWheel.

OnPaint

Represents property OnPaint.

OnPainting

Represents property OnPainting.

OnResize

Represents property OnResize.

Opacity

Represents property Opacity.

Padding

Represents property Padding.

PopupMenu

Represents property PopupMenu.

Position

Represents property Position.

Quality

Controls the quality of the FMX.RS.SVGCtrls.TRSSVGImage.Buffered painting of the SVG image. The value of quality can vary between 1 (low quality) to 8 (very high quality).

Note

This property controls the amount of oversampling performed in the buffered drawing. The offscreen buffers' dimensions are multiplied by the Quality value. Then, the offscreen buffers are downsampled when painting the control, providing anti-aliasing of the buffered drawing.
This property is intended for mobile applications. The quality on desktop FMX applications is already high and requires no extra memory.

Warning
Occasionally, oversampling can cause different output compared to the unbuffered output. The extra size of the buffers requires more triangles to output gradients and other elements. If this exceeds Embarcadero's limits, the element is not drawn.

RotationAngle

Represents property RotationAngle.

RotationCenter

Represents property RotationCenter.

Scale

Represents property Scale.

ScaleOriginal

Specifies the scale factor for drawing the SVG.

Use the ScaleOriginal property to scale the SVG larger or smaller within the TRSSVGImage component. This is useful for controlling the tiling the SVG or zooming in or out of the SVG

SVGDocument

Specifies the SVG document to display in the control. The SVGDocument and SVGRootID properties control exactly which SVG document and which branch of the SVG document hierarchy to display.

SVGMargins

Specifies the margins of the SVG displayed by this TRSSVGImage component.

Set or read the SVGMargins property in order to affect the margins of the SVG that is displayed by this TRSSVGImage component

SVGRoot

Represents property SVGRoot.

SVGRootID

Specifies which node of the SVGDocument to draw as the top- level SVG document.

Use the SVGRootID property to display only a portion of the SVGDocument .

Visible

Represents property Visible.

Width

Represents property Width.

WrapMode

Specifies whether and how to resize, replicate, and position the SVG image for rendering the TRSSVGImage surface.

The WrapMode property should be one of the constants defined in the TSVGImageWrapMode type:

iwOriginal-- displays the SVG with its original dimensions.

iwFit-- best fit (keeping SVG proportions--the ratio between the width and height) for the TRSSVGImage rectangle. Default.

iwStretch--stretches the SVG to fill the entire rectangle of this TRSSVGImage component.

iwTile--tiles the TRSSVGImage image to cover the entire rectangle of the TRSSVGImage component.

iwCenter-- center the SVG inside the TRSSVGImage component

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	Name	Description
	DoElementClick(TSVGPoint)	Represents method DoElementClick(TSVGPoint).
	DoSVGChanged(TObject)	Represents method DoSVGChanged(TObject).
	GetBitmap	Represents method GetBitmap.
	GetSVGRoot	Represents method GetSVGRoot.
	IsBuffered	Returns True if the SVG should be drawn to a offscreen bitmap
	MouseMove(TShiftState,Single,Single)	Represents method MouseMove(TShiftState,Single,Single).
	MouseUp(TMouseButton,TShiftState,Single,Single)	Represents method MouseUp(TMouseButton,TShiftState,Single,Single).
	Notification(TComponent,TOperation)	Represents method Notification(TComponent,TOperation).
	Paint	Represents method Paint.
	Resize	Represents method Resize.
	SetCursorFromSVG(TSVGPoint)	Represents method SetCursorFromSVG(TSVGPoint).
	UpdateBitmap	Represents method UpdateBitmap.

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Name

Description

OnClickElement

Occurs when the clicks the mouse in the control. The Element parameter specifies the element that was under the mouse cursor, or nil if no element was under the mouse.

The FMX.RS.SVGCtrls.TRSSVGImage.FindOptions property specifies how the control determines which svg element is under the mouse cursor.

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Tip

By default, TRSSVGImage draws the SVG to a offscreen bitmap and then draws that bitmap to the control's canvas as needed. This is recommended as it is faster. However, on mobile devices, you may see some aliasing. If you set the Bufferedproperty to false, the TRSSVGImage class will draw the SVG directly to the control's canvas which will reduce aliasing. There is also another option for improved anti-aliasing on mobile devices; set the form's Quality property to HighQuality.

New for v2.0: Set the FMX.RS.SVGCtrls.TRSSVGImage.Quality property to a higher number (2, 4 or 8) to improve anti-aliasing when drawing Buffered SVGs. However, this will consume significantly more memory and is slower.

Tip
The TRSSVGImage always loads and draws the SVG image from the TRSFmxSVGDocument in the context of the main GUI thread. For more complex SVG documents, you may want to use the TRSSVGThreadImage control to load and draw a SVG within a background thread.

Warning
If the SVGRootID property is not empty, the ID must exist in the SVG document or nothing is displayed.

At design-time, you would:

• Drop an SVG document component on your form ( RSSVGCtrls|TRSSVGDocument for VCL, TRSFMXSVGDocument for FMX) SelectComponentVcl

• Set the TRS[FMX]SVGDocument.Filename property to the SVG file. Alternatively, you can directly paste the SVG into the Lines property (warning: Delphi's TStrings editor will truncate long lines causing problems with some SVG text)

• Drop a TRSSVGImage component on the form

• Connect the TRSSVGImage.SVGDocument to the RSSVGDocument1 (VCL) or RSFMXSVGDocument1 (FMX) SelectSVGDocVcl

• Optionally, if you only want to display one branch of the SVG document, you can set the TRSSVGImage.SVGRoot property to the SVG element you want to display. If the SVGRoot is not empty and it does not equal any SVG element in the document, nothing is displayed.

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TRSSVGImage Class

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