Once the draw bead is defined, this button is enabled, as illustrated in Figure 10.3.13. Click this button to enable the Operation button illustrated in Figure 10.3.14. The modification Operations include: Respace, Edit, Split, Trim, Combine and Extend.

Figure 10.3.14  Modify draw bead

·           RESPACE

This function allows the user to respace points on the draw bead. Click this button to display the Respace dialog box illustrated in Figure 10.3.15. Select a method for definition and click Apply to confirm. Since screen selection is supported for this operation, the user can use screen selection to operate different draw beads. The ID number of the currently edited draw bead is shown in this dialog box.

Figure 10.3.15  Respace dialog box

·           EDIT

This function allows the user to edit the draw bead. The program will pop up a Curve Edit dialog box for the user to edit the draw bead with appropriate functions. Refer to Section 5.1.15 for detailed description about operation of this function. After the user selects a draw bead in the draw bead list, the user will next click the Edit button so that the selected draw bead will be edited. If the user does not select draw bead in the list before selecting Edit, the program will pop up a dialog box for the user to select a draw bead to be edited through screen selection.

·           SPLIT

This function allows the user to split a draw bead. Click this button, and the Select Split Point dialog box will be displayed. The user clicks the left mouse button on the screen to select a position. Then the program will find the nearest node to the selected position and split the draw bead at that node. The original draw bead is divided into two draw beads with the same property as the original draw bead, as illustrated in Figure 10.3.16. This operation can be performed on different draw beads continuously.

 

(a)  Before split                         (b)  After split

Figure 10.3.16  Split draw bead

·           TRIM

This function allows the user to trim a draw bead line. The user selects a trim position first on the draw bead to be trimmed and then selects another node as the trim direction. If a node on the left side of the trim position is selected, the left part of draw bead will be trimmed; if a node on the right side of the trim position is selected, the right part of draw bead will be trimmed. This operation can be performed on different draw beads continuously.

·           COMBINE

This function allows the user to combine two adjacent draw beads.

1.        Click the left mouse button in the display area to select a draw bead.

2.        Select another draw bead which is adjacent to the selected one, as illustrated in Figure 10.3.17. The program will combine these two draw bead.

Only one combine operation can be performed by clicking this button.

    

(a)  Before combine                                      (b)  After combine

Figure 10.3.17  Combine draw bead

Note: This function allows the user to combine two adjacent draw beads with different properties. If the two adjacent draw beads have the same property, the combined draw bead will have the same property with them. If the two draw beads have different properties, the combined draw bead will have the same property with the first selected draw bead.

·           EXTEND

This function allows the user to extend the selected draw bead. Click this button to display a dialog box illustrated in Figure 10.3.18. The user clicks the left mouse button on the display area to select a draw bead to be extended. The program will select the end point which is nearer the selected position as the extend point. Only one extend operation will be performed by clicking the left button.

Figure 10.3.18  Extend Bead

DISTANCE: Define the extension distance. The maximum value is 100.

CURRENT: Show the ID number of the current selected draw bead.