The Graph window displays graphs, which show the results of the current analysis. Hydromax will automatically display the graph that displays the result of the current analysis when you select Graph from the Windows menu or press the  toolbar button. Alternatively you can select a specific graph using the Windows | Graphs menu item. Only the graphs that are applicable to the current analysis can be displayed.

Graphs can be copied using the Edit | Copy command.

Hydromax can graph many types of data depending on the type of analysis being performed. These graphs include Upright Hydrostatics, Curves of Form, Curve of Areas, Righting Lever (GZ curve), Longitudinal Strength, Floodable Length and Tank Capacities. These can all be displayed via the Graphs item in the Windows menu.

Tip: You can use the Select View from Analysis Data option (page 110) to see the Curve of Areas for each heel angle and/or intermediate stage during the analysis.

To display an interpolated value from one of the curves, use the mouse to click anywhere on the curve. The data in the lower left corner of the window will change to display the curve name and co-ordinates of the mouse on the curve. Click anywhere on the dashed line and drag it with the mouse; as you move the cursor the interpolated values will be displayed.

Note:

In case multiple curves are plotted in the same graph you can switch between the curves by clicking on them. Hydromax will ignore the exact position you click on the curve to allow reading all related interpolated values along the black dashed line.

The GZ value, Area and corresponding heel angle can be measured by using the slider; the slider data is displayed at the bottom of the Graph window. The area is integrated from zero heel angle to the location of the graph slider.

Note:

Because the horizontal axis scale is always in degrees, the area is always given in units of length.degrees and cannot be displayed in units of length.radians.

Note

The lower integration limit is always zero (irrespective of the equilibrium angle). Thus if you require the area between two limits, you must subtract the area at the lower limit from the area at the higher limit.

A curve fit will be performed if all the heel angle intervals are less than or equal to 10˚. If this is the case, a parametric cubic spline is used to fit a smooth curve through the calculated GZ data at the specified heel angles. This ensures that the fitted line goes exactly through the calculated GZ points. If you wish to prevent this curve fitting, add a heel angle interval of greater than 10˚ as the final step. This can sometimes be useful if you expect a discontinuity in the GZ curve.

The graphed data can be obtained by double clicking on the graph. Since the graph data contains more data points than most tables in the results window, this double click can be extremely helpful to export the analysis data to for example Excel fro further processing. Especially in the case of the sectional area curve, where there is no tabular data available.

Also see: Copying Tables on page 109.

When you are in the Graph window you can use the View | Colour dialog to change the colours of the curves in the graph as well as the background. The View | Font command allows you to change the text size and font size.

You can copy the contents of the Graph window using the Copy command or Ctrl+C. Note that the picture is placed in the clipboard as a meta-file which can be resized in Word or Excel.

Note

When the graph is pasted in Microsoft Word^®, the graph can be edited by right clicking on the graph and selecting “edit picture”.