FromRectangle takes a plain rectangle and converts it into one with the specified units.

ParseDimension parses a string consisting of 1 to 4 Values that describe a Dimension.

ParseRectangle parses a string consisting of 4 Values that describe a Rectangle.

Ch is the character width of the numeral zero glyph '0' of the active font face.

Dp is 1 density independent pixel: 1/160th of an inch.

Em is the height of the active font face, disregarding extra leading such as from double-spaced lines of text.

Ex is the x-height of the active font face.

In is 1 inch.

Mm is 1 millimetre: 1/25.4th of an inch.

Pt is 1 point: 1/72th of an inch.

Px is a physical pixel, regardless of the DPI resolution.

Value is a number and a unit.

Unit is a unit of length, such as inches or pixels.