Marker
Markers are used to highlight particular values or value ranges against either the domain or range axes. Markers can be displayed with or without labels.
The following image below illustrates marker usage:
Label Position
The image below illustrates how the marker label anchor position is calculated relative to the marker's bounds. One of the nine potential anchors is selected via the Label Anchor property, and
the margin between the marker's bounds and the potential anchor points is determined by the Label Offset and Label Offset Type methods.
Label Offset Type is Contract:
Label Offset Type is Expand:
Properties
These properties apply to all types of markers. Every specific type of markers has additional properties, at least ones defining its location (e.g. category, value, etc.).
Property | Name | Type | Description |
Paint | paint | Data Table | Paint used to draw the marker. |
Stroke | stroke | Data Table | Stroke used to draw the marker, if it is drawn as a line. If the marker is a rectangular region, the outline is drawn using Outline Stroke, so this attribute is not used in that case. |
Outline Paint | outlinePaint | Data Table | Paint paint used to draw the marker outline. This field is not used when the marker is drawn as a line. |
Outline Stroke | outlineStroke | Data Table | Stroke used to draw the marker outline. This field is not used when the marker is drawn as a line. |
Alpha | alpha | Float | Alpha transparency that should be used to draw the marker. This is a value in the range 0.0f (completely transparent) to 1.0f (completely opaque). |
Label | label | String | Label text (which may be null). If the label string is null (the default), the marker will be drawn without a label. |
Label Font | labelFont | Data Table | Paint used to draw the marker. |
Label Paint | labelPaint | Data Table | Paint used to draw the label. |
Label Anchor | labelAnchor | String | Point on the marker bounds that is used for alignment of the label. This anchor (after being adjusted by the label offsets) determines a fixed point on the chart that the marker label can be aligned to. Available anchor values are Center, Top, Bottom, Left, Right, Top Left, Top Right, Bottom Left, and Bottom Right. |
Label Text Anchor | labelTextAnchor | String | Point on the label that is aligned to the fixed point on the chart determined by the Label Anchor property. |
Label Offset | labelOffset | Data Table | Offset between the marker's bounds and the label anchor points. The default value is (3.0, 3.0, 3.0, 3.0), that is, the anchor points lie on a rectangle three units inside (or outside) the marker's bounding rectangle. See Rectangle Insets. |
Label Offset Type | labelOffsetType | String | Label offset type: No Change, Expand or Contract. This controls how the insets returned by Label Offset are applied to calculate the label anchor position. |
Type | type | Integer | Marker type: Category, Value, or Interval. This field may be unavailable if only one marker type is applicable. |
Was this page helpful?