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In the previous section’s tutorial on architectural CAD drawing, I introduced to you the techniques for drawing double-flight stairs using domestic CAD software; since double-flight stairs are custom objects, they can be edited by dragging their grip points. Next, let the editor introduce to you a tutorial on architectural CAD drawing that shows how to edit double-flight stairs using the ladder grips in the domestic CAD software – HaoChen CAD Building Software! Construction CAD Drawing Tutorial: Explanation of the stair grip function “Move Stair”. This grip is used to change the position of the stair, and it is located at the two corner points of the stair landing. “\"Change platform width\" – This grip is used to adjust the width of the landing platform; it is located between the platform and the stairs, and once adjusted, the stair segment adjusts automatically ； . “\"Change shaft width\": Drag this handle to adjust the shaft width; this will also change the width of the flight of stairs, but not the width of the stairwell ； “\"Change stairwell width\": Drag this grip to adjust the width of the stairwell; this will also change the width of the flight of stairs, while keeping the width of the shaft unchanged ； “\"Change the position of a flight of stairs\": This grip is adjusted to be located at the midpoint of the end of a flight, and dragging the grip vertically can change the position of that flight of stairs ； “\"Adjust the position of the second flight of stairs\": This grip is now positioned at the midpoint of the starting point of the second flight; dragging this grip vertically can change the position of that flight of stairs ； “\"Adjust the armrest extension distance\": The two control points are located at each end of the armrest; drag them to change the extension distance of the armrest at the platform and the floor level ； “\"Move Cut Position\" – This grip is used to change the position of the stair cut; it can be dragged along the stair to adjust the position ； “The two control points of “Move Cutting Angle” are used to change the position of the staircase cut; the angle can be adjusted by dragging them ； “The grip point of the “upstairs” arrow is used to switch between the upper and lower flight of stairs ； “\"Floor slab line position\" – this grip is available only on the top floor and is used to cut out openings in the top-floor floor slab in order to cover part of the staircase. For the various types of double-flight stairs, in the properties panel, the available radius options are: none, single side, and double sides. The radius values that can be chosen are: half the width of the stairwell, or the width of a single flight of stairs. When the option “As a ramp” is selected, the evacuation radius can be set through the properties panel, as shown in the figure below. In this way, it is possible to quickly modify the drawn drawings based on the specific functions of the intersection points; generally, subsequent discussions in design require changes to these elements. The use of intersection point functions is very important in architectural design. The above CAD drawing tutorial covers the techniques for editing double-flight staircases using the grip points in the domestic CAD software HaoChen CAD for architectural purposes. Those who are interested can refer to this tutorial to give it a try~