How to construct - a Rose Window

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How to construct - a Rose Window

Postby Clive » Wed Mar 27, 2013 12:28 pm

I am amazed at what the 'Master' masons designed and built during the middle ages with mostly only a square and compass to hand and a good grasp of geometry principles and of course the Romans before them.
Today we have a wonderful 2D cad program - QCAD :wink: , in which we can adopt these very same geometry principles and draw equally amazing designs in the fields of Engineering, Construction and design and the probably un-ending list of craft activities.
Outlined below is one method of using QCAD to draw up a simple Gothic Rose window design.

1. Draw a Hexagon, call the Polygon tool;
Line Tools > Polygon and select either polygon (Center point PG1) or Polygon (Two corners PG2).
Enter 6 in the Corner field.

2. Divide Hexagon into 12 equal parts, set up a new layer to do this (Layer Construction, color Magenta).

3. Draw Circle ( circumscribe -outside) using one of the Hexagon corner points for a radii reference.

Draw a Rose window.png
Draw a Rose window.png (4.54 KiB) Viewed 6778 times

4. Extend all construction lines to meet Circle circumference.

5. Draw 2nd smaller Circle from center point.

Draw a Rose window 2.png
Draw a Rose window 2.png (15.46 KiB) Viewed 6778 times

6. Split smaller Circle into 24 equal parts:
Select Circle > Modify > Split Entities - enter 24 in the Parts field and tick the Green tick to finish the process.

Draw a Rose window 3.png
Draw a Rose window 3.png (16.83 KiB) Viewed 6778 times

7. Draw smaller Circle to fit perfectly between center (End part 'A') and intersection 'B'.

Draw a Rose window 4.png
Draw a Rose window 4.png (5.9 KiB) Viewed 6778 times

8. Copy and paste Circles to fit (7).
9. Draw a border Circle (8).
10. Repeat process to draw another larger Rosette. (9).

Draw a Rose window 5.png
Draw a Rose window 5.png (36.57 KiB) Viewed 6778 times

11. Finally 'clean up' the drawing using modify tools - 'Break out segment' and the Delete tool.

* Change the construction layer to a color that suits!

Should be job done :wink: .

Draw a Rose window 6.png
Draw a Rose window 6.png (15.95 KiB) Viewed 6778 times
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