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### Trimming

There are four ways to trim:

Figure 55: Characterizations of trimming

Exercise (TRIM ENTITY): Generate several intersecting line segments and first try out trimming with the characterizations BTWE and OENT before then using the characterizations BTWP and OPNT.
Solution: When trimming between elements BTWE or outside of elements OENT, SISCAD-P computes the intersection of the selected element with other lines that are closest to the clicking point, i.e the selection point of the element. The element is then trimmed at those points either inside or outside, depending on the characterization.

Figure: TRIM ENTITY BTWE

Figure: TRIM ENTITY OENT

The difference between the previous characterizations BTWE and OENT and the characterizations BTWP and OPNT is that the selected element is trimmed at defined points rather than at an element. The trim points are selected using the mandatory parameters P1 and P2, and they are defined as being the projection (at right angles) of the points P1 and P2 onto the element to be trimmed.

Figure: TRIM ENTITY BTWP

Figure: TRIM ENTITY OPNT

tip for trimming at points: If you are working with the intelligent snap mode, you can first generate the points on the element to be trimmed, and then trim.

Figure 60: Trimming with intelligent snap mode active