# Roof Design - Move Partial Line

The 'Move Partial Line' function allows a portion of a roof edge line, or an entire line, to be moved. The two adjacent roof edge lines of the same roof surface are never lengthened or shortened; instead, new line segments are always created as connections to the moved segment. The moved line may have a different length than the originally selected segment. In this case, new oblique lines result. The new roof surface segment then becomes one-sidedly sloped or trapezoidal. It then appears, for example, as follows:

<figure><img src="https://1294550180-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0t0AJ2HDudwBgiGFR59Q%2Fuploads%2FLx3AmJYwtPJI2AVKCyvE%2FTeilLinieSchieben1.jpg?alt=media&#x26;token=91d77fcf-80f2-4e9f-a122-dbe41ba64c81" alt=""><figcaption></figcaption></figure>

A segment of an eaves is pulled out. New lines are created on both sides, which are assigned the verge type.

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The partial line has acquired a different (shorter) length.\
\| | The displacement in the X direction is 0.000 and therefore a trapezoidal roof surface segment is formed.

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The partial line has acquired a different (shorter) length.\
The displacement in the X direction is not equal to 0.000. A positive displacement was entered that is exactly half the difference between the old and new length of the partial line.

For this function, first select the line from which a portion is to be moved. Then select two points that define the area to be moved. You may use all usual snap and input functions for this. The points do not have to lie on the line; they can be chosen anywhere. Each selected point is then projected onto the chosen line. For the second point, using the arrow key is also convenient when the line appears exactly horizontal or vertical on the screen. You can then simply enter a distance from the first point.

If you actually want to move the entire line (see note in the chapter 'Move Line'), select the start and end points of the line.

Next specify the length of the partial line. The default displays the length of the selected partial line. If you change this value, the partial line receives a new length and the laterally adjacent lines become oblique.

Next you can move the selected line graphically and place it at the desired position. All snap and input functions are available. During the move, the line can only be displaced perpendicular to its previous position. If the line should also be moved in the X direction, a displacement can be entered later.

After placing the line, a dialog box opens in which you can correct the position of the line once more. When any number is changed, the other numbers adjust automatically if necessary.

**Batten spacing / covering width of standard tiles:** If tiles have been entered on the roof, you can adjust the position of the line to the covering length or covering width of the tiles. Depending on which line you moved (e.g., eaves or verge), the text will change accordingly. If the line does not run parallel to the slope direction of the roof surface (verge) and not perpendicular to the slope direction (eaves), adjustment to the tiles is not possible. In that case, it is also no longer reasonable.

> The covering length or covering width of the tiles used is automatically specified here. However, the value can also be changed.

**Number of tile rows:** This field specifies the number of tile rows. Immediately after moving the line this is usually a fractional value and therefore the field is highlighted in red as a warning. Using the plus and minus controls at the right end of the field, the value can be increased or decreased. The value is always rounded to an integer and the red highlight disappears.

**Shift within the roof surface:** This value shows the distance of the new line to the old one, measured along the slope of the surface.

**Displacement in base Y:** This shows the displacement in plan from the old position to the new position of the line.

**Vertical displacement:** This value indicates the height difference between the old and the new position of the line.

**Elevation of the line:** This field displays the absolute elevation of the new line, measured from global 0.

**Displacement in X direction:** Here the moved partial line can be shifted longitudinally (parallel). A value of 0.000 leaves it exactly as after the graphical move. If the new partial line is shorter than the original partial line, this produces a uniform trapezoid. The red arrows indicate the positive slider direction. Using negative values you can shift in the opposite direction.
