Example #1
0
    def createFeature(self,
                      feedback,
                      feature_id,
                      type,
                      geometries,
                      class_field=None):
        attrs = [feature_id]
        if class_field is not None:
            attrs.append(class_field)

        multi_point = QgsMultiPoint()

        for g in geometries:
            if feedback.isCanceled():
                break

            vid = QgsVertexId()
            while True:
                if feedback.isCanceled():
                    break
                found, point = g.constGet().nextVertex(vid)
                if found:
                    multi_point.addGeometry(point)
                else:
                    break

        geometry = QgsGeometry(multi_point)
        output_geometry = None
        if type == 0:
            # envelope
            rect = geometry.boundingBox()
            output_geometry = QgsGeometry.fromRect(rect)
            attrs.append(rect.width())
            attrs.append(rect.height())
            attrs.append(rect.area())
            attrs.append(rect.perimeter())
        elif type == 1:
            # oriented rect
            output_geometry, area, angle, width, height = geometry.orientedMinimumBoundingBox(
            )
            attrs.append(width)
            attrs.append(height)
            attrs.append(angle)
            attrs.append(area)
            attrs.append(2 * width + 2 * height)
        elif type == 2:
            # circle
            output_geometry, center, radius = geometry.minimalEnclosingCircle(
                segments=72)
            attrs.append(radius)
            attrs.append(math.pi * radius * radius)
        elif type == 3:
            # convex hull
            output_geometry = geometry.convexHull()
            attrs.append(output_geometry.constGet().area())
            attrs.append(output_geometry.constGet().perimeter())
        f = QgsFeature()
        f.setAttributes(attrs)
        f.setGeometry(output_geometry)
        return f
Example #2
0
    def createFeature(self, feedback, feature_id, type, geometries, class_field=None):
        attrs = [feature_id]
        if class_field is not None:
            attrs.append(class_field)

        multi_point = QgsMultiPoint()

        for g in geometries:
            if feedback.isCanceled():
                break

            vid = QgsVertexId()
            while True:
                if feedback.isCanceled():
                    break
                found, point = g.constGet().nextVertex(vid)
                if found:
                    multi_point.addGeometry(point)
                else:
                    break

        geometry = QgsGeometry(multi_point)
        output_geometry = None
        if type == 0:
            # envelope
            rect = geometry.boundingBox()
            output_geometry = QgsGeometry.fromRect(rect)
            attrs.append(rect.width())
            attrs.append(rect.height())
            attrs.append(rect.area())
            attrs.append(rect.perimeter())
        elif type == 1:
            # oriented rect
            output_geometry, area, angle, width, height = geometry.orientedMinimumBoundingBox()
            attrs.append(width)
            attrs.append(height)
            attrs.append(angle)
            attrs.append(area)
            attrs.append(2 * width + 2 * height)
        elif type == 2:
            # circle
            output_geometry, center, radius = geometry.minimalEnclosingCircle(segments=72)
            attrs.append(radius)
            attrs.append(math.pi * radius * radius)
        elif type == 3:
            # convex hull
            output_geometry = geometry.convexHull()
            attrs.append(output_geometry.constGet().area())
            attrs.append(output_geometry.constGet().perimeter())
        f = QgsFeature()
        f.setAttributes(attrs)
        f.setGeometry(output_geometry)
        return f