QGIS API Documentation
3.0.2-Girona (307d082)
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A class to trim lines and polygons to within a rectangular region. More...
#include <qgsclipper.h>
Public Types | |
enum | Boundary { XMax, XMin, YMax, YMin } |
A handy way to refer to the four boundaries. More... | |
Static Public Member Functions | |
static QPolygonF | clippedLine (const QgsCurve &curve, const QgsRectangle &clipExtent) |
Takes a linestring and clips it to clipExtent. More... | |
static void | trimFeature (QVector< double > &x, QVector< double > &y, bool shapeOpen) |
Trims the given feature to a rectangular box. More... | |
static void | trimPolygon (QPolygonF &pts, const QgsRectangle &clipRect) |
Static Public Attributes | |
static const double | MAX_X = 16000 |
Maximum X-coordinate of the rectangular box used for clipping. More... | |
static const double | MAX_Y = 16000 |
Maximum Y-coordinate of the rectangular box used for clipping. More... | |
static const double | MIN_X = -16000 |
Minimum X-coordinate of the rectangular box used for clipping. More... | |
static const double | MIN_Y = -16000 |
Minimum Y-coordinate of the rectangular box used for clipping. More... | |
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).
Definition at line 45 of file qgsclipper.h.
enum QgsClipper::Boundary |
A handy way to refer to the four boundaries.
Enumerator | |
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XMax | |
XMin | |
YMax | |
YMin |
Definition at line 77 of file qgsclipper.h.
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Takes a linestring and clips it to clipExtent.
curve | the linestring |
clipExtent | clipping bounds |
Definition at line 41 of file qgsclipper.cpp.
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inlinestatic |
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).
Definition at line 181 of file qgsclipper.h.
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inlinestatic |
Definition at line 202 of file qgsclipper.h.
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Maximum X-coordinate of the rectangular box used for clipping.
Definition at line 67 of file qgsclipper.h.
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Maximum Y-coordinate of the rectangular box used for clipping.
Definition at line 71 of file qgsclipper.h.
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Minimum X-coordinate of the rectangular box used for clipping.
Definition at line 69 of file qgsclipper.h.
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Minimum Y-coordinate of the rectangular box used for clipping.
Definition at line 73 of file qgsclipper.h.