Class: QgsMathUtils

Contains utility functions for mathematical operations.

Added in version 4.0.

List of all members, including inherited members

Static Methods

doubleToRational	Converts a double value to a rational fraction.
roundedRange	Expands a range outward to round values, e.g. a range of 1234.5 - 3456.7 is expanded to 1200 - 3500.
roundingInterval	Returns a round interval, a power of ten, which splits the given span into at least divisions parts.

class qgis.core.QgsMathUtils

Bases: object

static doubleToRational(value: float, tolerance: float = 1e-09, maxIterations: int = 100)

Converts a double value to a rational fraction.

Parameters:

• value (float) – value to convert

• tolerance (float = 1e-09) – desired precision. The returned fraction will be at within this tolerance of the original value.

• maxIterations (int = 100) – maximum number of iterations. Higher values result in better approximations, but at the cost of additional computation.

Return type:

(int, int)

Returns:

• numerator: calculated numerator

• denominator: calculated denominator

static roundedRange(range: QgsDoubleRange) → QgsDoubleRange

Expands a range outward to round values, e.g. a range of 1234.5 - 3456.7 is expanded to 1200 - 3500.

The bounds are rounded to a tenth of the order of magnitude of the range’s size, so that the returned range stays close to the original one.

Infinite and empty ranges are returned unchanged.

Added in version 4.4.

Parameters:

range (QgsDoubleRange)

Return type:

QgsDoubleRange

static roundingInterval(span: float, divisions: int = 10) → float

Returns a round interval, a power of ten, which splits the given span into at least divisions parts. E.g. a span of 2222 returns 100 for 10 divisions and 10 for 100 divisions.

Returns 0 if span is not finite or is not greater than 0, or if divisions is lower than 1.

Added in version 4.4.

Parameters:

• span (float)

• divisions (int = 10)

Return type:

float