Chapter 2: Basic Editing
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2-2: Circuit Creation
2-2-1: Node Creation
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Node creation is done by selecting a node from the component menu in the side bar (on the left). Nodes in the component menu are outlined in blue. After clicking on one of these nodes, click in the edit window to place the node. If you hold the Control key, the node location will snap to one of the axes.

The location of the cursor is aligned to the nearest grid unit. This adjustment can be controlled with the Grid Preferences (in menu File / Preferences..., "Display" section, "Grid" tab, see Section 4-7-2).

When placing a node, the cursor points to the anchor point of the newly created node. This is the center (for primitives) or the location of the cell-center (for cell instances). Cell instances can change their anchor point by moving the Cell-Center node inside of their layout (see Section 3-3).

When placing a node, but before you click to actually create the node, it is possible to temporarily switch from node-placement to zoom/pan mode. This allows you to better select the location of the newly-created node. To temporarily zoom, type "z", zoom the display, and then type "z" again to finish placing the node. To temporarily pan, type "p", pan the display, and then type "p" again to finish placing the node. For more on zooming and panning, see Sections 4-4-1 and Sections 4-4-2.

Besides basic components, there are special entries in the component menu for creation of additional nodes:

Figure 2.17
  • "Cell Instance..." brings up a dialog to select a cell instance to place (see Section 3-3).
  • "Annotation Text" places a node that contains only text (see Section 6-8-1). This can also be accomplished with the Add Text Annotation command (in menu Edit / Text)
  • "Layout Text..." brings up a dialog to create text from layout nodes (see Section 6-10-3).
  • "Layout Image..." brings up a dialog to create an image from layout nodes (see Section 6-10-3).
  • "Annular Ring..." brings up a dialog to create circular shapes (see Section 6-10-3).
  • "Cell Center" places a node that defines the origin of the cell (see Section 3-3).
  • "Essential Bounds" places a node that defines the corners of the cell's essential bounds (see Section 7-6-3).


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