def processAlgorithm(self, progress):
layer = QGisLayers.getObjectFromUri(self.getParameterValue(self.INPUT))
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
layer.pendingFields().toList(), QGis.WKBPolygon, layer.crs())
inFeat = QgsFeature()
outFeat = QgsFeature()
extent = layer.extent()
height = extent.height()
width = extent.width()
c = voronoi.Context()
pts = []
ptDict = {}
ptNdx = -1
features = QGisLayers.features(layer)
for inFeat in features:
geom = QgsGeometry(inFeat.geometry())
point = geom.asPoint()
x = point.x() - extent.xMinimum()
y = point.y() - extent.yMinimum()
pts.append((x, y))
ptNdx += 1
ptDict[ptNdx] = inFeat.id()
if len(pts) < 3:
raise GeoAlgorithmExecutionException(
"Input file should contain at least 3 points. Choose another file and try again."
)
uniqueSet = Set(item for item in pts)
ids = [pts.index(item) for item in uniqueSet]
sl = voronoi.SiteList([
voronoi.Site(i[0], i[1], sitenum=j)
for j, i in enumerate(uniqueSet)
])
voronoi.voronoi(sl, c)
inFeat = QgsFeature()
current = 0
total = 100.0 / float(len(c.polygons))
for site, edges in c.polygons.iteritems():
request = QgsFeatureRequest().setFilterFid(ptDict[ids[site]])
inFeat = layer.getFeatures(request).next()
lines = self.clip_voronoi(edges, c, width, height, extent, 0, 0)
geom = QgsGeometry.fromMultiPoint(lines)
geom = QgsGeometry(geom.convexHull())
outFeat.setGeometry(geom)
outFeat.setAttributes(inFeat.attributes())
writer.addFeature(outFeat)
current += 1
progress.setPercentage(int(current * total))
del writer
def processAlgorithm(self, progress):
layer = QGisLayers.getObjectFromUri(self.getParameterValue(self.INPUT))
fields = [
QgsField("POINTA", QVariant.Double, "", 24, 15),
QgsField("POINTB", QVariant.Double, "", 24, 15),
QgsField("POINTC", QVariant.Double, "", 24, 15)
]
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
fields, QGis.WKBPolygon, layer.crs())
pts = []
ptDict = {}
ptNdx = -1
c = voronoi.Context()
features = QGisLayers.features(layer)
for inFeat in features:
geom = QgsGeometry(inFeat.geometry())
point = geom.asPoint()
x = point.x()
y = point.y()
pts.append((x, y))
ptNdx += 1
ptDict[ptNdx] = inFeat.id()
if len(pts) < 3:
raise GeoAlgorithmExecutionException(
"Input file should contain at least 3 points. Choose another file and try again."
)
uniqueSet = Set(item for item in pts)
ids = [pts.index(item) for item in uniqueSet]
sl = voronoi.SiteList([voronoi.Site(*i) for i in uniqueSet])
c.triangulate = True
voronoi.voronoi(sl, c)
triangles = c.triangles
feat = QgsFeature()
current = 0
total = 100.0 / float(len(triangles))
for triangle in triangles:
indicies = list(triangle)
indicies.append(indicies[0])
polygon = []
attrs = []
step = 0
for index in indicies:
request = QgsFeatureRequest().setFilterFid(ptDict[ids[index]])
inFeat = layer.getFeatures(request).next()
geom = QgsGeometry(inFeat.geometry())
point = QgsPoint(geom.asPoint())
polygon.append(point)
if step <= 3:
attrs.append(QVariant(ids[index]))
step += 1
feat.setAttributes(attrs)
geometry = QgsGeometry().fromPolygon([polygon])
feat.setGeometry(geometry)
writer.addFeature(feat)
current += 1
progress.setPercentage(int(current * total))
del writer