All measurement features are located under mainmenu/utilities/measurement. Some of these tools will measure only selected shapes.
A manual or automatic ruler can be used. For a manual ruler click two points with the mouse. To make the ruler permanent hold the control key on the second click. For an automatic measurement in x and y-direction to the next edge of a visible shape hold down the shift key on the first click. Also here you can make the ruler permanent with pressing the control key. A permanent ruler means, that the rule is added to the active layer. With a shift+control key on the first click, you can delete all rulers.
An angle between two or three entered points is measured. In case two points entered the angle will be calculated to the x-axis. When three points are entered the angle is measured between these three points with the first entered point as the center.
A area of all selected shapes is calculated. Overlapping area is calculated twice. Selected cell references are completely added to the area.
The fill density of the choosen layer is calculated. The bounding box of the current cell is used as reference area. There is an option to count overlapping area only once.
The length of an entered multi segment line is measured.
The smallest and larges size of the shape under the mouse is measured. Also the distance to the clicked shape is displayed.