Add a Line
This mode allows a line through two points to be added. The mode is powerful enough to generate the line together with the two points with just one mouse action. When the mouse is pressed, the first point is added. Dragging the mouse generates the second point and the line. When the mouse is released, the position of the second point is frozen, and the construction is finished. The logic behind this mode is very similar to the logic behind other interactive modes, such as add a parallel, add a perpendicular, and add a circle.
Constructing a line in this mode is a three-step procedure:
The figures below show the three stages during the construction of a line. Here the first point is a free point and the second point is the intersection of the two existing lines.
Add a line mode creates a line connecting two points by a press–drag–release sequence.
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