Qgis_plugin/objectfindertool.py at master · Sanjutha1512/Qgis_plugin · GitHub

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# -*- coding: latin1 -*-
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *
from qgis.gui import *

class VertexAndObjectFinderTool(QgsMapTool):

    vertexAndObjectFound = pyqtSignal(object)

    def __init__(self, canvas):
        QgsMapTool.__init__(self, canvas)
        self.canvas = canvas
        self.count = 0
        self.rb = None
        self.m1 = None
        # self.p1 = QgsPoint()
        self.cursor = QCursor(QPixmap(["16 16 3 1",
                                      "      c None",
                                      ".     c #FF0000",
                                      "+     c #FFFFFF",
                                      "                ",
                                      "       +.+      ",
                                      "      ++.++     ",
                                      "     +.....+    ",
                                      "    +.     .+   ",
                                      "   +.   .   .+  ",
                                      "  +.    .    .+ ",
                                      " ++.    .    .++",
                                      " ... ...+... ...",
                                      " ++.    .    .++",
                                      "  +.    .    .+ ",
                                      "   +.   .   .+  ",
                                      "   ++.     .+   ",
                                      "    ++.....+    ",
                                      "      ++.++     ",
                                      "       +.+      "]))


    def canvasPressEvent(self, event):

        ## First we need to select the object.
        if self.count % 1 == 0:

            vlayer = self.canvas.currentLayer()
            if vlayer is None:
                return

            self.type = vlayer.geometryType()
            self.isPolygon = True
            if self.type == 1:
                self.isPolygon = False
            else:
                self.isPolygon = True

            if self.rb is not None:
                if self.isPolygon:
                    self.rb.reset(QGis.Polygon)
                else:
                    self.rb.reset()

            layerCoords = self.toLayerCoordinates( vlayer, event.pos() )
            searchRadius = QgsTolerance.vertexSearchRadius( vlayer, self.canvas.mapRenderer() )


            pointGeometry = QgsGeometry.fromPoint( layerCoords )
            if pointGeometry is None:
              return

            try:
                minDistance = float('inf')
            except ValueError:
                minDistance = 1e100000

# #            minDistance = 1e100000

            self.cf = QgsFeature()
            for f in vlayer.getFeatures():
                if f.geometry() is not None:
                    currentDistance = pointGeometry.distance( f.geometry() )
                    if currentDistance < minDistance:
                        minDistance = currentDistance
                        self.cf.setGeometry(f.geometry())
            try:
                if minDistance == float('inf'):
                    return
            except ValueError:
                if minDistance == 1e100000:
                    return

#            if minDistance == 1e100000:
#                return


            self.rb = self.createRubberBand(self.isPolygon)
            self.rb.setToGeometry( self.cf.geometry(), vlayer )

            self.count += 1

            if self.count > 1:
                self.vertexAndObjectFound.emit([self.cf,  self.m1,  self.rb])


    def canvasMoveEvent(self,event):
        pass


    def canvasReleaseEvent(self,event):
        pass


    def createRubberBand( self, isPolygon ):
        if isPolygon:
            rb = QgsRubberBand( self.canvas, QGis.Polygon )
        else:
            rb = QgsRubberBand( self.canvas )
        color = QColor(255,0,0,100)
        rb.setColor(color)
        rb.setWidth(2)
        rb.show()
        return rb


    def showSettingsWarning(self):
        #get the setting for displaySnapWarning
        settings = QSettings()
        settingsLabel = "/UI/displaySnapWarning"
        displaySnapWarning = bool(settings.value(settingsLabel))

        #only show the warning if the setting is true
        if displaySnapWarning:
          m = QgsMessageViewer()
          m.setWindowTitle("Snap tolerance")
          m.setCheckBoxText("Don't show this message again")
          m.setCheckBoxVisible(True)
          m.setCheckBoxQSettingsLabel(settingsLabel)
          m.setMessageAsHtml( "<p>Could not snap vertex.</p><p>Have you set the tolerance in Settings > Project Properties > General?</p>")
          m.showMessage()

    def activate(self):
        self.canvas.setCursor(self.cursor)

    def deactivate(self):
        self.canvas.scene().removeItem(self.m1)
        self.m1 = None
        if self.rb is not None:
            self.rb.reset()
        self.count = 0
        pass

    def isZoomTool(self):
        return False

    def isTransient(self):
        return False

    def isEditTool(self):
        return True