TechDraw WeldSymbol

Description
The WeldingSymbol tool adds welding specifications to an existing leader line.



Usage

 * 1) Select an existing
 * 2) Press the  button
 * 3) A Task dialog will open. The dialog allows entry/selection of individual welding symbols and accompanying text to be added to the leader line.
 * 4) To exit the dialog and save changes, press the OK button.
 * 5) To exit the dialog without saving, press the Cancel button.
 * 6) After the welding symbol is created, it can be edited by double clicking the WeldingSymbol in the Tree.

Weld Symbol

 * : Shows the All Around symbol (circle) at the kink in the leader line.
 * : Show the Field Weld symbol (flag) at the kink in the leader line.
 * : Offsets the lower symbol to indicate alternating welds.
 * : Text to be shown at the end of the leader line.

Tile
Each individual symbol ("arrow side" and "other side") is represented by a "tile" object. A Welding Symbol has 1 or 2 tiles associated with it. Each of it has the following properties:
 * : The parent Weld Symbol
 * : Row of the tile. 0 means above the line, -1 below the line. (This property is not intended to be changed, just as information.)
 * : Not implemented yet - there is only column 0 at the moment.
 * : Directory and file name of the symbol's SVG file.
 * : Directory and file name of the actual included symbol SVG file. (It is a temporary directory.)
 * : Text to be displayed to the left of the SVG symbol.
 * : Text to be displayed above/below the SVG symbol.
 * : Text to be displayed to the right of the SVG symbol.

Scripting
TechDraw API and FreeCAD Scripting Basics.

The WeldingSymbol tool can be used in macros and from the Python console by using the following functions:

Svg Symbol Tiles

 * Individual symbols are formed by 64x64 pixel Svg files. Additional symbols can be created in an Svg program like Inkscape using one of the supplies symbols as a template.


 * Individual symbols are formed by 64x64 (nominal) pixel Svg files. The tiles actually have a "border" of 4px. The border ensures that the leader line and symbol meet nicely.
 * The symbol is drawn in black on a transparent background. The stroke is 0.5mm.
 * The leader passes below symbols for the arrow side and above symbols for the "other" side.
 * There is no particular naming standard other than to append "Up/Down" to the arrow/other side symbols where required.