DoubleCAD contains a variety of dimension tools that you can use to display the measurements of lines and angles.
Dimensions consist of three basic components:
Dimension lines, with arrows pointing to either end of the dimension. A linear dimension can have an interior dimension line or two exterior dimension lines. Exterior dimension lines can be supplemented with an optional interior line.
Extension lines, which connect the dimension line to the object being dimensioned. Extension lines have optional line segments that continue the extension outward beyond the dimension line (extensions to the extension).
Dimension text, typically displaying the distance being dimensioned in World units.
Note: For information on editing dimensions, see Editing Dimensions. To create a group of dimensions automatically, see Auto DimensionTo constrain dimensions, see Constraining Dimensions.