Displaying Curves, Vertices and Data points
- Last UpdatedJan 04, 2024
- 3 minute read
All active curves that are initially visible, indicated by a tick in the Visible column of the Curves grid in the Data Bar (see also Data Bar). Clicking in the tick box toggles the display on and off. The visibility of vertices, data points and curvature tufts are controlled in a similar fashion, but are only displayed if the curve to which they belong is visible.
Figure 3:30. Curves grid of the Data Bar.
The contents of the columns of the Curves grid are as follows:
|
Column |
Description |
|---|---|
|
Curve |
The name of the curve, as it appears in Lines. This is read-only, as it is used for identification purposes. |
|
Correspondence |
Fitted and Fitted(centripetal) means that the curve is currently fitted to its data points, None means that it is not, hence editing data points will not affect the curve. The editor establishes whether curves are initially fitted to their data points when it is opened. Editing vertices directly forces this correspondence to None. Fitted and Fitted(centripetal) produce slightly differently shaped curves |
|
Visibility |
Toggle the display of the whole curve. |
|
Control Points |
Toggle the display of the curve's control points. |
|
Data points |
Toggle the display of the curve's data points. |
|
Curvature |
Toggle the display of the curve's curvature tufts. |
|
Colour |
The display colour of the curve. |
Table 3: 1. Column functions.
Popup menus are available for controlling the display of attributes of groups of curves. Click the Right Mouse button on a cell in the relevant column to obtain these menus:
Figure 3:31. Data Points column popup menu.
Select groups of cells by holding <Shift> (for contiguous groups) or <Ctrl> (non-contiguous groups) in the normal Windows manner.
It is usually advisable not to display the data points and vertices of a fitted curve at the same time. Besides obscuring one another, there is a danger of inadvertently moving a control point. This will break the correspondence between the curve and its data points.
The display options that appear in the Curves grid can be accessed for individual curves from popup menus. These are launched by clicking the Right Mouse button (with the cursor in Pick mode) on a curve in one of the graphics views, or on the curve’s entry in the tree.
Display of both active and inactive curves can be controlled from the tree (see also Curve View Tree). First select the curve (or group of curves by using <Ctrl> or <Shift>), then click the Right Mouse button to get a popup menu that allows the display of the curves to be toggled on and off. Clicking the Right Mouse button on the root of a group of curves launches a popup that gives control over the display of all active and inactive curves in the group.
Figure 3:32. Controlling the display of individual curves using the tree
Figure 3:33. Controlling the display of a group of curves using the tree