Sketch problem with rectangle creation and placement - needs some pointers

[Anonymous]

I am hoping someone can help with what I think should be a simple procedure. So I am in Design sketch. I have a simple square lets say 100mmx100mm . Then I want to add a rectangle 20mm down from the top starting on the left side and then extending as an 80mmx20mm rectangle. Is this possible without adding points or construction lines, or snap to grid which never works to my advantage when using parts of mm, or wanting from a middle location.

I am hoping there is some easy way, but have struggled with this so much. Especially of I want to constrain with dimesnions and then change the size later on, it all goes haywire.

[davebYYPCU · Accepted solution]

Draw the two rectangles (centre point and dimensioned as you go),

make the two left edges Colinear, 

Add the 20mm dimension from top line.

Might help....

[Anonymous]

Brilliant thanks had not even thought of using dimenions

[Anonymous]

Having tried the solution one suggestion I would add is to not create the second rectangle using the centre option as I couldnt find an easy way to make this colinear with the left edges. Just creating the 20x80 recatgle using two point option snaps to the edge and then you can apply the constraints of 20x80 , then add the dimension to the top space of 20mm and wonderful. Maybe there is a trick to positioning a rectangle conlinear with another edge but I could not find it. (tried move point to point and other move options , nothing snapped)

[davebYYPCU · Accepted solution]

Colinear - lower down the constraints menu, (does not work with (need) snapping points)

Shift Select the two lines, press Colinear, or,

Select colinear then click moving and destination lines.

Coincident is another animal. (Uses snapping Points)

Makes no difference - three point, centre point or two point rectangles, if they are dimensioned as you create it.

can you Screencast what’s going astray?

[chrisplyler]

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@Anonymous wrote:

Brilliant thanks had not even thought of using dimenions

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That's very curious. You were pretty specific with desired dimensions in your opening post. How did you imagine you might achieve them without using dimensions?

[davebYYPCU]

Snap to grid - first thing to hide / cancel in the defaults.

[Anonymous]

Will now as I hate snaps

[Anonymous]

I think its coming for Sketchup and having their paradigm. I thought of dimensions applying to objects not space between objects. Dumb I know but you live an learn. Maybe its my age ........

[Anonymous]

I must find a tutorial on constraints you have opebned my eyes.