Greetings
So you want to maintain the 45º angle at left, while changing the dimensions of the Shape, is that right ?
There are several Methods.
- Via EditPoints
- Make the EditPoints in the Shape visible, which will be the vertices.
- Choose just the two corners at right (in this example)
- Drag the two EditPoints to your destination
- Details and movies in the How to Make an Adjustable Shape Q&A.
- Via Chop
- Essentially make a new Shape each time, it is simple enough to do
- Draw the long rectangle, with the dimensions and attributes, as desired. This is the target
- Draw a second small rectangle that will cover a portion at left. This is the subtractive rectangle
- Rotate the second rectangle 45º
- Place it over the target rectangle, such that the vertex which requires the 45º angle is lined up (easy to do if you use a Grid)
- Select both rectangles
- Menu/Edit/Shapes/SubtractShapes
- While drawing, for ease, copy-paste the rotated subtractive rectangle a few times, so as to maintain a magazine, to be used when necessary.
Cheers


