The Selection tool is the most important tool in the system giving you control over the schematic.
This section describes the selection and the snap grid.
When the mouse is moved within the schematic three items are displayed:
The mouse cursor is the standard cursor displayed for all windows while the other two are specific to the schematic. The schematic cursor is a cross defining the drawing point and snaps to the snap grid (see later). The cursor icon indicates the current mode of the tool and shows a different shape for each tool selected from the main toolbar.
Single click
When the left mouse button is pressed (and released) over an object that object is selected (indicated by a dashed rectangle drawn around it).
Bounding box
When the mouse is used to define a bounding box (Press left mouse button and hold - drag mouse - release left mouse button). Any objects within the bounding box are selected.
Selecting multiple objects
When the shift button is pressed either of the above actions will add to the current selection.
Selecting Wire or line vertices
Corners of lines, wires and busses can be selected by dragging a bounding box over the line/wire/bus corners. When this is done a selection circle is drawn at each vertex which can then be dragged - the line/wire/bus is dragged with the vertex selection circle. Lines are dragged in any direction (i.e. non-orthogonally) while wires are dragged orthogonally (see wires). Note that netnames are also dragged with wires and buses.
Selection of Grouped objects
Grouped objects can be selected either with a single mouse click or by using a bounding box. When a single mouse click is made on any part of the group then the whole of the group is selected. When using a bounding box the entire object including text attributes must be included inside the bounding box.
The snap grid is an invisible grid defining where items will be drawn. It allows items to be aligned on the schematic so that they connect together e.g. wires that connect must meet at the same point and the snap grid positions the drawing point so that this happens.
The snap grid defaults to 10 pixels but can be changed using the menu Controls->Snap grid, or from the control toolbar. This can be necessary for drawing objects that do not need to align with other objects e.g. (while drawing detailed graphics).
In general keep the snap grid set to 10.