CNiGraph

CNiGraph encapsulates the interface to the Measurement Studio ActiveX graph control, which allows you to plot and chart two-dimensional data.

CNiGraph is capable of responding to events that are generated by the control. For a list of the events that can be generated by this control and details on how to respond to the events in your program, refer to the Graph Events page.

Features

• Plotting and Charting - plotting data refers to the process of taking a large number of points and updating one or more plots on the graph with new data, replacing the old plot with the new plot. Charting data appends new data points to an existing plot over time. Charting is used with slow processes where only few data points per second are added to the graph. When the number of data points exceeds the number of points that can be displayed on the graph, the graph scrolls so that new points are added to the right side of the graph while old points disappear to the left.
• Multiple plot styles - point, line, line-point, and bar.
• Multiple plots with individual properties such as name, line and point style, width, and base value.
• Cursors - display a crosshair on a graph to mark a specific point or region on the graph or highlight data.
• Configurable axes, including customizable ticks, labels, value pairs, and captions.
• Built-in format styles for labels, including scientific, symbolic engineering, scaling, time, and date.
• Panning and zooming at runtime - panning is useful when the graph displays only a subset of the data that has been plotted. You can scroll through all data plotted on the graph, essentially shifting the graph's display to different portions of the plot.

Note: Set the TrackMode property to allow user interaction (such as panning, zooming, moving cursors, and moving annotations) with the graph while your program is running.

• CNiGraph includes bindable properties. You can bind these properties to a DataSocket source or target. This allows you to read property values from and write property values to the source or target. Click here for a list of bindable properties.

Note: To specify a date/time value, you must convert your date or time value to a double. A date is implemented as a floating-point value with the integer part of the number measuring days from midnight, 30 December 1899, and the fractional part representing the time of day. The absolute value of the fractional part of the number represents the time as a fraction of a day. Thus, 1 second equals 1 / 24 hours / 60 minutes, which is 1/86400 or approximately 1.157407e-5. So, midnight, 31 December 1899, is represented by 1.0. Similarly, 6 AM, 1 January 1900, is represented by 2.25, and midnight, 29 December 1899, is -1.0. However, 6 AM, 29 December 1899, is -1.25.

 Hierarchy Chart