Years later, I finally found a use for all the stuff they tried to teach me about straightedges and compasses and parallel lines. I could use their techniques to help me draw old-school-D&D-map stairs like in the image to the right (bonus points to the first grognard to tell us which module this chunk of map is from).
You will need the following tools:
- Pencil (for construction lines)
- Pen or marker (for final lines)
- Good white drafting eraser
- 2 drafting triangles
- Drafting compass (optional)
I'll start with a hallway that I want to put stairs in (just like the one toward the top left of the map above).
Use one of the straightedges to draw two guide lines in light pencil from the top of the stairs to the bottom. At this point, truly particular drafting geeks can use the compass to draw evenly-spaced tick marks down one of the guide lines.
Set up the two triangles as shown. Set the guide triangle (the top one in the image) parallel to the direction your stairs go (I aligned it with a line on the graph paper). Press it against the paper so it doesn't move. Slide the other triangle to a point where its edge crosses both of the guide lines. Line it up with a tick mark if you drew some. Press down to hold it in place, but always keep pressure on the guide triangle as well. If you draw with a light touch you shouldn't need much pressure on the second triangle.
Draw a line in ink along the second triangle's edge from one guide line to the other. Keeping pressure on the guide, slide the second triangle along the stairs (to the next tick mark if you drew them) and repeat.
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