Draw PNS with this tool. PNSDraw is a graphical interface to draw and design PNS (Process Network Synthesis) problems.

PNSDraw Features:
1. Draw materials, operating units, connections
2. Edit connection arrow position and define breakpoints and Bezier curves
3. For PNS : define object's name and flow rates
4. Define colors for objects
5. Multiple object moving
6. Zoom
7. Grid and align to grid
8. Export to PNG image format, SVG format, PNS format
9. One step Undo / Redo

Using PNS Draw
1. Adding materials and operating units
First option: Drag the material or operating unit symbol in the toolbar and drop to the editor area.
Second option: Change the draw mode in the toolbar to material or operating unit and click on the editor area to put them.

2. Connecting obejcts
Select the Link option in the Drawing Mode dropdown list.
Click on the first object then click on the second object.

3. Selecting objects
Click on the object to select one object.
Press SHIFT key and click on another object to add to the selection, or remove from selection.
Press down the left mouse button and move the mouse to select the objects. You can use the SHIFT key to add or remove objects from selection.

4. Scroll and zoom
Zoom: Ctrl + mouse wheel
Scroll Up-Down: mouse wheel
Scroll Left-Right: SHIFT + mouse wheel
Move the editor area: press down the right mouse button and move the mouse

5. Add and remove breakpoints to lines
There are two breakponts:
- temporary (small dot)
- line breakpoint (bigger dot)
Adding: Select a line (with left mouse button), the temporary breakpoints will be shown then move these to create new line breakpoints.
Removing: Select a line then select the line breakpoint then press the Delete key.

6. Keys:
Ctrl + U : undo
Ctrl + Y : redo
Ctrl + S : save
Delete : delete selected objects
Shift: invert selection
Ctrl: free moving of objects (when snap to grid is on)

The license of this software is Free, you can free download and free use this graphing software.