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March 7, 2013 16:58
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Création d'une ligne à partir d'une direction (en degrés) et d'une distance dans QGIS - Creating a line from a direction (in degrees) and a distance in QGIS (QGIS 2.8I)
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'''For QGIS 2.8 | |
Martin Laloux, 2012''' | |
from PyQt4.QtCore import * | |
from numpy import * | |
class distance(object): | |
def __init__(self,a,angle,distance): | |
self.a = a.asPoint() | |
self.xori = self.a[0] | |
self.yori = self.a[1] | |
self.angle = angle | |
self.distance = distance | |
self.xfinal =0 | |
self.yfinal = 0 | |
self.dist_x = 0 | |
self.dist_y = 0 | |
self.fet = QgsFeature() | |
self.vl = QgsVectorLayer("LineString", "temporary_lines", "memory") | |
self.pr = self.vl.dataProvider() | |
@property | |
def resultat(self): | |
self.dist_x, self.dist_x = (self.distance * sin(radians(self.angle)),self.distance * cos(radians(self.angle))) | |
self.xfinal, self.yfinal = (self.xori + self.dist_x, self.yori + self.dist_x) | |
return self.xfinal, self.yfinal | |
@property | |
def x(self): | |
return self.resultat[0] | |
@property | |
def y(self): | |
return self.resultat[1] | |
@property | |
def final(self): | |
return QgsGeometry.fromPoint(QgsPoint(self.x,self.y)) | |
@property | |
def trace(self): | |
fields = { 0 : QgsField("first", QVariant.Int) } | |
self.pr.addAttributes( [ QgsField("first", QVariant.Int)]) | |
self.fet.setGeometry(QgsGeometry.fromPolyline( [ QgsPoint(self.xori , self.yori ), QgsPoint(self.x, self.y) ] )) | |
self.pr.addFeatures( [ self.fet ] ) | |
self.vl.updateExtents() | |
self.vl.updateFieldMap() | |
QgsMapLayerRegistry.instance().addMapLayer(self.vl) | |
>>> point_dep = QgsGeometry.fromPoint(QgsPoint(231009.737,110767.821)) | |
>>> point_arriv = distance(point_dep, 20, 100) | |
>>> point_arriv.final | |
<qgis.core.QgsGeometry object at 0x12afd9200> | |
>>> point_arriv.resultat | |
(231043.93901433257, 110861.79026207859) | |
>>> point_arriv.x | |
231043.93901433257 | |
>>> point_arriv.y | |
110861.79026207859 | |
>>> point_arriv.trace | |
>>> point_arriv2 = distance(point_arriv.final, 80, 200) | |
>>> point_arriv2.x | |
231240.900564935 | |
>>> point_arriv2.y | |
110896.51989761197 | |
>>> point_arriv2.trace | |
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