Air exchange source - how do you draw one?

[avp081090]

Hello

I´ve been trying to draw air exchange source but i can´t figure out the system for which you draw..it doesn´t follow the coordinate system for which you did the geometry.

Best regards

[veitner]

Origin for sources are left most and bottom Most of your Geometrie.

[Christian Bludau]

Move your mouse over the grid, the coordinates of the position are shown at the bottom of the window. Take the coordinates of your desired position and divide the coordinates of the lower left edge (origin of your construction).
Even easier is to begin the drawing in (0,0) then the coordinate of the element in the source is the same like the mouse position.

Christian