1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
"""
***************************************************************************
RectangleMapTool.py
---------------------
Date : August 2012
Copyright : (C) 2012 by Victor Olaya
Email : volayaf at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
__author__ = "Victor Olaya"
__date__ = "August 2012"
__copyright__ = "(C) 2012, Victor Olaya"
from qgis.PyQt.QtCore import pyqtSignal
from qgis.PyQt.QtGui import QColor
from qgis.core import QgsPointXY, QgsRectangle, QgsWkbTypes
from qgis.gui import QgsMapTool, QgsMapToolEmitPoint, QgsRubberBand
class RectangleMapTool(QgsMapToolEmitPoint):
rectangleCreated = pyqtSignal()
deactivated = pyqtSignal()
def __init__(self, canvas):
self.canvas = canvas
QgsMapToolEmitPoint.__init__(self, self.canvas)
self.rubberBand = QgsRubberBand(
self.canvas, QgsWkbTypes.GeometryType.PolygonGeometry
)
self.rubberBand.setColor(QColor(255, 0, 0, 100))
self.rubberBand.setWidth(2)
self.reset()
def reset(self):
self.startPoint = self.endPoint = None
self.isEmittingPoint = False
self.rubberBand.reset(QgsWkbTypes.GeometryType.PolygonGeometry)
def canvasPressEvent(self, e):
self.startPoint = self.toMapCoordinates(e.pos())
self.endPoint = self.startPoint
self.isEmittingPoint = True
self.showRect(self.startPoint, self.endPoint)
def canvasReleaseEvent(self, e):
self.isEmittingPoint = False
if self.rectangle() is not None:
self.rectangleCreated.emit()
def canvasMoveEvent(self, e):
if not self.isEmittingPoint:
return
self.endPoint = self.toMapCoordinates(e.pos())
self.showRect(self.startPoint, self.endPoint)
def showRect(self, startPoint, endPoint):
self.rubberBand.reset(QgsWkbTypes.GeometryType.PolygonGeometry)
if startPoint.x() == endPoint.x() or startPoint.y() == endPoint.y():
return
point1 = QgsPointXY(startPoint.x(), startPoint.y())
point2 = QgsPointXY(startPoint.x(), endPoint.y())
point3 = QgsPointXY(endPoint.x(), endPoint.y())
point4 = QgsPointXY(endPoint.x(), startPoint.y())
self.rubberBand.addPoint(point1, False)
self.rubberBand.addPoint(point2, False)
self.rubberBand.addPoint(point3, False)
# True to update canvas
self.rubberBand.addPoint(point4, True)
self.rubberBand.show()
def rectangle(self):
if self.startPoint is None or self.endPoint is None:
return None
elif (
self.startPoint.x() == self.endPoint.x()
or self.startPoint.y() == self.endPoint.y()
):
return None
return QgsRectangle(self.startPoint, self.endPoint)
def setRectangle(self, rect):
if rect == self.rectangle():
return False
if rect is None:
self.reset()
else:
self.startPoint = QgsPointXY(rect.xMaximum(), rect.yMaximum())
self.endPoint = QgsPointXY(rect.xMinimum(), rect.yMinimum())
self.showRect(self.startPoint, self.endPoint)
return True
def deactivate(self):
QgsMapTool.deactivate(self)
self.deactivated.emit()
|
