我正在尝试从QGraphicsView获取各种鼠标事件的坐标,但我不知道如何触发它们。最终,我想要向graphicsView添加一张图片,然后在其上面进行绘制。
理想情况下,我希望这些坐标的原点在左上角。
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test.py
import sys
from PyQt4 import QtCore, QtGui, uic
class test(QtGui.QMainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
self.ui = uic.loadUi('test.ui', self)
self.connect(self.ui.graphicsView, QtCore.SIGNAL("mousePressEvent()"), self.mouse_pressed)
self.connect(self.ui.graphicsView, QtCore.SIGNAL("mouseMoveEvent()"), self.mouse_moved)
self.connect(self.ui.graphicsView, QtCore.SIGNAL("mouseReleaseEvent()"), self.mouse_released)
self.ui.show()
def mouse_pressed(self):
p = QtGui.QCursor.pos()
print "pressed here: " + p.x() + ", " + p.y()
def mouse_moved(self):
p = QtGui.QCursor.pos()
print "moved here: " + p.x() + ", " + p.y()
def mouse_released(self):
p = QtGui.QCursor.pos()
print "released here: " + p.x() + ", " + p.y()
def main():
app = QtGui.QApplication(sys.argv)
ui = test()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
test.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>800</width>
<height>600</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralwidget">
<layout class="QVBoxLayout" name="verticalLayout">
<item>
<widget class="QGraphicsView" name="graphicsView"/>
</item>
</layout>
</widget>
<widget class="QMenuBar" name="menubar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>800</width>
<height>22</height>
</rect>
</property>
</widget>
<widget class="QStatusBar" name="statusbar"/>
</widget>
<resources/>
<connections/>
</ui>
编辑:
这似乎有效。椭圆不再可移动,因为点击事件似乎接管了控制权。有什么想法吗?
import sys
from PyQt4 import QtCore, QtGui, uic
class graphicsScene(QtGui.QGraphicsScene):
def __init__ (self, parent=None):
super(graphicsScene, self).__init__ (parent)
def mousePressEvent(self, event):
position = QtCore.QPointF(event.scenePos())
print "pressed here: " + str(position.x()) + ", " + str(position.y())
self.update()
def mouseMoveEvent(self, event):
position = QtCore.QPointF(event.scenePos())
print "moved here: " + str(position.x()) + ", " + str(position.y())
self.update()
def mouseReleaseEvent(self, event):
position = QtCore.QPointF(event.scenePos())
print "released here: " + str(position.x()) + ", " + str(position.y())
self.update()
class test(QtGui.QMainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
self.ui = uic.loadUi('test.ui', self)
self.scene = graphicsScene()
self.ui.graphicsView.setScene(self.scene)
pen = QtGui.QPen(QtCore.Qt.red)
brush = QtGui.QBrush(QtCore.Qt.blue)
e = self.scene.addEllipse(10,10,100,100, pen, brush)
e.setFlag(QtGui.QGraphicsItem.ItemIsMovable, True)
self.ui.show()
def main():
app = QtGui.QApplication(sys.argv)
ui = test()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
connect
。而且,仅仅重载mousePressEvent()
比安装事件过滤器更容易和更清晰。 - jmkQGraphicsView
并在 UI 文件中将视图提升为此子类。这是一种过度复杂化的方法。如果想要更改视图的行为并在多个不同的地方重用该类,则子类化QGraphicsView
是明智的选择。我假设在简单情况下不需要这样做。 - Pavel StrakhovQColor.red
和QColor.blue
是函数。你需要使用Qt.red
和Qt.blue
枚举值。 - Pavel Strakhov