Configuring Graph Background

Purpose

This topic explains, with code examples, how to configure a background for the bullet graph. This includes setting the background’s size, position, color, and border.

Required background

The following topics are prerequisites to understanding this topic:

Topic	Purpose
XamBulletGraph Overview	This topic provides conceptual information about the XamBulletGraph™ control including its main features, minimum requirements, and user functionality.
Adding XamBulletGraph	This topic explains how to add the XamBulletGraph control to a Xamarin.Forms application.

In this topic

This topic contains the following sections:

Configuring the Background
Related Content
- Topics

Configuring the Background

Background configuration summary

The background of the XamBulletGraph control is configurable in terms of spread, position and look-and-feel (fill and border). The spread and position are configurable in the dimension across the scale (through the BackingInnerExtent and BackingOuterExtent properties); along the scale, the background always spreads from one edge of the control to the other. The fill color and the border are managed by a set of properties available in the style template.

The following picture demonstrates a background color of a variety of orange and a cyan border with a thickness of 3 pixels. The background extent is made smaller by providing values for its BackingInnerExtent and BackingOuterExtent properties.

BulletGraph Configuring the Background 1.png

Background configuration summary chart

The following table explains briefly the configurable aspects of XamBulletGraph control’s background and maps them to properties that configure them.

Configurable aspects	Property	Default value
Spread and position (across the scale)	BackingInnerExtent	0
Spread and position (across the scale)	BackingOuterExtent	1.0
Fill color	BackingBrush	Defined in the default theme
Border color	BackingOutline	Defined in the default theme
Border thickness	BackingStrokeThickness	2.0

Property settings

The following table maps the desired behavior to its respective property settings.

In order to configure:	Details	Use this property:	And set it to:
Bottom Left edge position	The position of the lower edge of the background (at horizontal orientation) or the left edge (at vertical orientation) relative to the bottom edge of the Graph area at horizontal orientation or to its left edge – at vertical orientation.	BackingInnerExtent	The desired value as a relative part of the height/width of the Graph area (depending on the orientation) presented as a fraction of 1 (e.g. 0.2)
Top / right edge position	The position of the top edge of the background at horizontal orientation or the right edge at vertical orientation relative to the lower edge of the Graph area at horizontal orientation or to its left edge – at vertical orientation.	BackingOuterExtent	The desired value as a relative part of the height/width of the Graph area (depending on the orientation) presented as a fraction of 1 (e.g. 0.2 )
Fill color	Fill color of the background	BackingBrush	The desired color
Border thickness	Border thickness of the background	BackingStrokeThickness	The desired value in pixels
Border color	Border color of the background	BackingOutline	The desired color

Example

The screenshot below demonstrates how the XamBulletGraph looks as a result of the following settings:

Property	Value
BackingBrush	“#ffffdab9”
BackingOutline	“#ff00ffff”
BackingStrokeThickness	“3”
BackingInnerExtent	“0.2”
BackingOuterExtent	“0.7”

BulletGraph Configuring the Background 2.png

Following is the code that implements this example.

<ig:XamBulletGraph x:Name="bulletGraph"
                 BackingBrush="#ffffdab9"
                 BackingOutline="#ff00ffff"
                 BackingStrokeThickness="3"
                 BackingInnerExtent="0.2"
                 BackingOuterExtent="0.7" />

In C#:

bulletGraph.BackingBrush = new SolidColorBrush(Color.FromRgb(255, 218, 185));
bulletGraph.BackingOutline = new SolidColorBrush(Color.FromRgb(0, 255, 255));
bulletGraph.BackingStrokeThickness = 3;
bulletGraph.BackingInnerExtent = .2;
bulletGraph.BackingOuterExtent = .7;

Related Content

Topics

The following topics provide additional information related to this topic.

Topic	Purpose
Configuring the Scale (XamBulletGraph)	This topic explains, with examples, how to configure the scale of the XamBulletGraph control. This includes positioning the scale inside the control and configuring the scale tick marks and labels.
Configuring the Performance Bar (XamBulletGraph)	This topic explains, with examples, how to configure the performance bar of the XamBulletGraph control. This includes the value indicated by the bar, its width, position, and formatting.
Configuring the Comparative Marker (XamBulletGraph)	This topic explains, with code examples, how to configure the comparative measure marker of the XamBulletGraph control. This includes the marker’s value, width, and formatting.
Configuring Comparative Ranges (XamBulletGraph)	This topic explains, with code examples, how to configure ranges in the XamBulletGraph control. This includes the number of ranges and their positions, lengths, widths, and formatting.

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