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pointtool.py
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pointtool.py
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from qgis.core import QgsPointXY, QgsPoint, QgsGeometry, QgsFeature
from qgis.gui import QgsMapToolEmitPoint, QgsMapToolEdit, QgsRubberBand, QgsVertexMarker
from qgis.PyQt.QtCore import Qt
#from qgis.PyQt.QtWidgets import QApplication
from qgis.PyQt.QtGui import QColor
from osgeo import gdal
import numpy as np
import matplotlib.pyplot as plt
from .astar import find_path
from .line_simplification import smooth, simplify
class PointTool(QgsMapToolEdit):
def __init__(self, canvas,vlayer,iface,dockwidget):
self.last_mouse_event_pos = None
self.iface = iface
self.anchor_points = []
self.is_tracing = True
# possible variants: gray_diff, as_is, color_diff (using v from hsv)
self.grid_conversion = "gray_diff"
#QApplication.restoreOverrideCursor()
#QApplication.setOverrideCursor(Qt.CrossCursor)
QgsMapToolEmitPoint.__init__(self, canvas)
self.rlayer = None
self.vlayer = vlayer
self.rubber_band = QgsRubberBand(self.canvas(), False) # False = not a polygon
self.markers = []
def raster_layer_has_changed(self, raster_layer):
self.rlayer = raster_layer
sample, geo_ref = get_whole_raster(self.rlayer)
r = sample[0].astype(float)
g = sample[1].astype(float)
b = sample[2].astype(float)
where_are_NaNs = np.isnan(r)
r[where_are_NaNs] = 0
where_are_NaNs = np.isnan(g)
g[where_are_NaNs] = 0
where_are_NaNs = np.isnan(b)
b[where_are_NaNs] = 0
self.sample = (r,g,b)
self.grid = r+g+b
self.grid_inv = self.grid*-1 + self.grid.max()
self.geo_ref = geo_ref
def keyPressEvent(self, e):
# delete last segment if backspace is pressed
if e.key() == Qt.Key_Backspace:
# check if we have at least one feature to delete
if self.vlayer.featureCount() < 1: return
remove_last_feature(self.vlayer)
# remove last marker
if len(self.markers)>0:
last_marker = self.markers.pop()
self.canvas().scene().removeItem(last_marker)
# remove last anchor
if len(self.anchor_points)>0:
self.anchor_points.pop()
self.update_rubber_band()
# If caching is enabled, a simple canvas refresh might not be sufficient
# to trigger a redraw and you must clear the cached image for the layer
if self.iface.mapCanvas().isCachingEnabled():
self.vlayer.triggerRepaint()
else:
self.iface.mapCanvas().refresh()
elif e.key() == Qt.Key_A:
self.is_tracing = not self.is_tracing
self.update_rubber_band()
def canvasReleaseEvent(self, mouseEvent):
if self.rlayer is None:
print("Please select a raster layer to draw first!")
self.last_mouse_event_pos = mouseEvent.pos()
# hide rubber_band
self.rubber_band.hide()
if (mouseEvent.button()==Qt.RightButton):
# finish point path if it was last point
self.anchor_points = []
# hide all markers
while len(self.markers)>0:
marker = self.markers.pop()
self.canvas().scene().removeItem(marker)
return
qgsPoint = self.toMapCoordinates(mouseEvent.pos())
x1,y1 = qgsPoint.x(), qgsPoint.y()
self.anchor_points.append((x1,y1))
marker = QgsVertexMarker(self.canvas())
marker.setCenter(QgsPointXY(x1,y1))
self.markers.append(marker)
i1, j1 = get_indxs_from_raster_coords(self.geo_ref, x1, y1)
r, g, b, = self.sample
r0 = r[i1,j1]
g0 = g[i1,j1]
b0 = b[i1,j1]
current_point = r0+g0+b0
grid = np.abs(self.grid - current_point)
grid = np.abs( (r0-r)**2 + (g0-g)**2 + (b0-b)**2 )
if len(self.anchor_points)<2: return # we need at least two points to draw
x0, y0 = self.anchor_points[-2]
i0, j0 = get_indxs_from_raster_coords(self.geo_ref, x0, y0)
i1, j1 = get_indxs_from_raster_coords(self.geo_ref, x1, y1)
start_point = i0, j0
end_point = i1, j1
if self.is_tracing:
#path = find_path(self.grid_inv.astype(np.dtype('l')), start_point, end_point)
path = find_path(grid.astype(np.dtype('l')), start_point, end_point)
path = smooth(path, size=5)
path = simplify(path)
path_ref = [get_coords_from_raster_indxs(self.geo_ref, i, j) for i,j in path]
else:
path_ref = [(x0,y0), (x1,y1)]
add_features_to_vlayer(self.vlayer, path_ref)
# If caching is enabled, a simple canvas refresh might not be sufficient
# to trigger a redraw and you must clear the cached image for the layer
if self.iface.mapCanvas().isCachingEnabled():
self.vlayer.triggerRepaint()
else:
self.iface.mapCanvas().refresh()
#size = 20
#grid_small = grid[ i1-size : i1+size, j1-size : j1+size ]
#grid2_small = self.grid[ i1-size : i1+size, j1-size : j1+size ]
#plt.subplot(1,2,1)
#plt.imshow(grid_small, cmap='gray')
#plt.subplot(1,2,2)
#plt.imshow(grid2_small, cmap='gray')
#plt.show()
def update_rubber_band(self):
# this is very ugly but I can't make another way
if self.last_mouse_event_pos is None: return
x0, y0 = self.anchor_points[-1]
qgsPoint = self.toMapCoordinates(self.last_mouse_event_pos)
x1, y1 = qgsPoint.x(), qgsPoint.y()
points = [QgsPoint(x0, y0), QgsPoint(x1,y1)]
self.rubber_band.setColor(QColor(255, 0, 0))
self.rubber_band.setWidth(3)
if self.is_tracing:
self.rubber_band.setLineStyle(Qt.DotLine)
else:
self.rubber_band.setLineStyle(Qt.SolidLine)
self.rubber_band.setToGeometry(QgsGeometry.fromPolyline(points), self.vlayer)
def canvasMoveEvent(self, mouseEvent):
self.last_mouse_event_pos = mouseEvent.pos()
# we need at least one point to draw
if len(self.anchor_points) < 1: return
self.update_rubber_band()
def remove_last_feature(vlayer):
features = [f for f in vlayer.getFeatures()]
vlayer.deleteFeatures([features[-1].id()])
def add_features_to_vlayer(vlayer, points):
feat = QgsFeature(vlayer.fields())
polyline = [QgsPoint(x,y) for x,y in points]
feat.setGeometry(QgsGeometry.fromPolyline(polyline))
(res, outFeats) = vlayer.dataProvider().addFeatures([feat])
def get_indxs_from_raster_coords(geo_ref, x, y):
top_left_x, we_resolution, _, top_left_y, _, ns_resolution = geo_ref
i = int( (y - top_left_y) /ns_resolution ) * -1 # in qgis2 it was without * -1
j = int( (x - top_left_x) /we_resolution )
return i, j
def get_coords_from_raster_indxs(geo_ref, i, j):
top_left_x, we_resolution, _, top_left_y, _, ns_resolution = geo_ref
y = ( top_left_y- i*we_resolution )
x = top_left_x - j*ns_resolution * -1 # in qgis2 it was without *-1
return x + .5*ns_resolution, y - .5*we_resolution
def get_whole_raster(layer):
raster_path = layer.source()
ds = gdal.Open(raster_path)
band1 = np.array(ds.GetRasterBand(1).ReadAsArray())
band2 = np.array(ds.GetRasterBand(2).ReadAsArray())
band3 = np.array(ds.GetRasterBand(3).ReadAsArray())
geo_ref = ds.GetGeoTransform()
return (band1,band2,band3), geo_ref