[Up: Drawing]

Lines


Lines can be drawn by selecting one of the tiles at the bottom of the main window, and subsequently clicking-and-dragging on the canvas.


Clicking and dragging an existing line on the canvas will move the line. Grabbing the line close to its center will move the entire line, grabbing it close to either of its ends will move only that end. In this way you can stretch, shorten, and turn the line.


Other ways to modify a line can be achieved after clicking and thus activating the line. In particular:
• Turning the mouse wheel will bend the line.
• Pressing "i" will reverse the direction of the line (invert).

For other options (thickness, color, etc.), see Help > Show keyboard shortcuts.

In addition, all line parameters can be accessed and modified through the EditFrame which opens by pressing "e", or selecting View > Open/Close EditFrame.


Line A and B are attached to one another if one end of line A is moved to the vicinity of line B. This creates a vertex, which splits line B into two new lines (C and D). By default, the vertex is marked by a vertex marker. Moving line A away from the vertex will re-combine lines C and D back to a single line B.


The two ends of a bent line can also be attached to one another, which results in a closed circle. In this case, the "glue point" of the circle will not be marked by a vertex. One can always introduce a vertex marker with the help of a free-floating object (see Vertices).


One can also add a momentum arrow to a line by either pressing "p" or by checking the option in the EditFrame.