Tool attributes

Every tool for adding components to a circuit also has a set of attributes, which are imparted to the components created by the tool. When you select a tool, Logisim will change the attribute table to display that tool's attributes.

For example, suppose we want to create smaller AND gates. We view the AND tool's attributes by clicking the tool in the toolbar, and then we alter its Gate Size attribute.

Now, we can delete the two existing AND gates and add two new AND gates in their place. This time, they will be narrow. In the below image, we are viewing the upper AND gate's attributes, which are all inherited from the AND tool's attributes when it was created.

Though it doesn't happen with the Gate Size attribute, for some tools' attributes, changing the attribute changes the appearance of the tool's icon. The Pin tool's Facing attribute is an example of this.

The tools in the toolbar have a separate attribute set from the corresponding tools in the explorer pane. Thus, even though we changed the toolbar's AND tool to narrow AND gates, the AND tool in the Gates library will still add wide AND gates unless you change its attributes too. In fact, the input pin and output pin tools in the default toolbar are both the same as the Pin tool in the Base library, but they all have different attribute sets.

Next: User's Guide.