Class: QgsClipper

class qgis.core.QgsClipper

Bases: sip.wrapper

A class to trim lines and polygons to within a rectangular region. The functions in this class are likely to be called from within a render loop and hence need to as CPU efficient as possible. The main purpose of the functions in this class are to trim lines and polygons to lie within a rectangular region. This is necessary for drawing items to an X11 display which have a limit on the magnitude of the screen coordinates (+/- 32768, i.e. 16 bit integer).

Methods

clippedLine

Takes a linestring and clips it to clipExtent

trimFeature

Trims the given feature to a rectangular box.

trimPolygon

param pts

Attributes

MAX_X

MAX_Y

MIN_X

MIN_Y

XMax

XMin

YMax

YMin

class Boundary

Bases: int

MAX_X = 16000.0
MAX_Y = 16000.0
MIN_X = -16000.0
MIN_Y = -16000.0
XMax = 0
XMin = 1
YMax = 2
YMin = 3
clippedLine(curve: QgsCurve, clipExtent: QgsRectangle) → QPolygonF

Takes a linestring and clips it to clipExtent

Parameters
Return type

QPolygonF

Returns

clipped line coordinates

clippedLine(curve: QPolygonF, clipExtent: QgsRectangle) -> QPolygonF Takes a curve and clips it to clipExtent.

New in version 3.16.

trimFeature(x: Iterable[float], y: Iterable[float], shapeOpen: bool)

Trims the given feature to a rectangular box. Returns the trimmed feature in x and y. The shapeOpen parameter determines whether the function treats the points as a closed shape (polygon), or as an open shape (linestring).

Note

not available in Python bindings on android

Parameters
  • x (Iterable[float]) –

  • y (Iterable[float]) –

  • shapeOpen (bool) –

trimPolygon(pts: QPolygonF, clipRect: QgsRectangle)
Parameters