Add a Point
Usually, a single new point will be added when this mode is used. The mode is designed to be multipurpose and easy to use. Pressing the left mouse button generates a new point. When you drag the mouse with the left button pressed, you can change the position and definition of the newly added point. When you finally release the mouse button, the point is fixed. Its definition depends on the position at which the mouse was released. Sometimes, it can be more convenient to use the more powerful interactive modes such as add a line, add a parallel, and add a circle, which generate points together with other geometric elements.
As already mentioned, constructing a point can be described as a three-step procedure:
The elements that lead to the definition will always be highlighted.
The figures below show the three main situations: a "free point," a "point on a line," and an "intersection point." Notice that while the mouse is dragged, the coordinates that correspond to the point's position are displayed.
A point can also be added with a simple mouse click at the position at which the point should be placed. The above-mentioned three-step procedure collapses then to a single mouse click. However, it is often more convenient to take full advantage of the three steps mentioned above:
Press the mouse button down somewhere, drag the point to the desired position, and release the mouse.
Add a point mode creates a new point with a press–drag–release sequence. The definition is automatically adapted to the situation.
There are two situations in which it is not appropriate to add a point with this mode:
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