竞价艺术

路径查找器 pathfinder 感觉翻译成路径建立器更好些，或者直接翻译成计算器。类似计算交集、并集的东西。

网上的教程提到了这个功能，但没讲清楚。因为本身也不常用，所以可能他们自己也搞不太清楚。找到了参考手册的解释，手册里说得算是很明白了。

Summary of Pathfinder effects

Add Traces the outline of all objects as if they were a single, merged object. The resulting shape takes on the paint attributes of the top object.

Intersect Traces the outline of the region overlapped by all the objects.
Exclude Traces all nonoverlapping areas of the objects, and makes overlapping areas transparent. Where an even number of objects overlap, the overlap becomes transparent. Where an odd number of objects overlap, the overlap becomes filled.

Subtract Subtracts the frontmost objects from the backmost object. You can use this command to delete areas of an illustration by adjusting the stacking order.

Minus Back Subtracts the objects in back from the frontmost object. You can use this command to delete areas of an illustration by adjusting the stacking order.

Divide Separates a piece of artwork into its component filled faces (a face is an area undivided by a line segment).
Note: When you use the Divide button in the Pathfinder panel, you can use the Direct Selection or Group Selection tool to manipulate the resulting faces independently of each other. You can also choose to delete or preserve unfilled objects when applying the Divide command.

Trim Removes the part of a filled object that is hidden. It removes any strokes and does not merge objects of the same color.
Merge Removes the part of a filled object that is hidden. It removes any strokes and merges any adjoining or overlapping objects filled with the same color.

Crop Divides artwork into its component filled faces, and then deletes all the parts of the artwork that fall outside the boundary of the topmost object. It also removes any strokes.

Outline Divides an object into its component line segments, or edges. This command is useful for preparing artwork that needs a trap for overprinting objects. (See Create a trap.)
Note: When you use the Outline button in the Pathfinder panel, you can use the Direct Selection or Group Selection tool to manipulate each edge independently. You can also choose to delete or preserve unfilled objects when applying the Outline command.

Hard Mix Combines colors by choosing the highest value of each of the color components. For example, if Color 1 is 20% cyan, 66% magenta, 40% yellow, and 0% black; and Color 2 is 40% cyan, 20% magenta, 30% yellow, and 10% black, the resulting hard color is 40% cyan, 66% magenta, 40% yellow, and 10% black.

Soft Mix Makes the underlying colors visible through the overlapping artwork, and then divides the image into its component faces. You specify the percentage of visibility you want in the overlapping colors.

Trap Compensates for potential gaps between colors in artwork by creating a small area of overlap (called a trap) between two adjoining colors.