Arched Bar Graph
This object is similar to a linear bar graph, but has an arched shape. It is drawn around an Output Ellipse object that is enclosed by a defined rectangle. The angles are calculated from the positive x-axis in the mathematically positive (counterclockwise) direction. The position attribute always refers to the top left corner of the enclosing rectangle, regardless of orientation. The object is drawn transparently so that objects underneath can enhance the visual effect. A Change Size command may cause the “bar graph width” to reach or exceed half of the width or height of the object, but this does not cause the pool to be rejected. The Virtual Terminal may reduce the bar graph width value for drawing, but this reduced value is not stored in the object.
Attributes
Unique identifier of the object. This must be unique within the object pool (2 bytes, 0-65534).
The type of the object.
Width of the object in pixels.
Height of the object in pixels.
A colour based on the index of the Colour Palette.
Target line colour (if drawn).
Logical bits indicating which parts shall be drawn.
Start angle/2 (in degrees) from the positive x-axis counterclockwise (90° is straight up). Start and end angle define the arc. If start and end angle are equal, the arc of the bar graph is closed (360°).
End angle/2 (in degrees) from the positive x-axis counterclockwise (90° is vertically upward). Start and end angle define the arc. If start and end angle are equal, the arc of the bar graph is closed (360°).
Width of the bar graph in pixels. The width of the bar graph should be less than half of the total width or less than half of the total height, whichever is smaller.
Raw minimum value for the input before scaling. Offset and scale must be applied to determine the actual minimum value.
Raw maximum value for the input. Offset and scale must be applied to determine the actual maximum value.
Reference to a Variable object from which the value is taken.
Object ID of a Number Variable object from which the target value of the bar graph is retrieved. If this attribute is set to NULL, the target value is retrieved directly from the “Target Value” attribute. The value of the referenced Number Variable must be in the range of 0 to 65535.
Current target value. Used only if the “Target Value Variable Reference” attribute is NULL. The target value is displayed as a line in the bar graph to indicate a target or warning value. If the target value > maximum value or the target value < minimum value, the target line is displayed at one of the ends of the bar graph without an error being generated by the VT.
Current integer value of the object if no variable reference is used.
Number of contained macro references, even if it is zero.
Each macro reference consists of 2 bytes: one for the event Id and one for the macro Id.
When the specified event occurs, the associated macro is executed. VT version 5 and later: A reference to a macro with a 16-bit Object Id counts as 2 macro references in the context of this attribute.
