更改QGraphicsView的方向
问题描述 投票：1回答：1
我有一些x和y坐标与一些QGraphicItems相关联，然后放入QGraphicView。我最近注意到，在选择带有rubberBand功能的项目时，我的圆点没有正确定位。
我有4个点重叠，它们在错误的位置重叠，我做了一些调试，发现我的起源是从左上角开始，Y +正在下降，我的X +向右移动。
我想要我的系统，以便Y +随着它的增加而变大。我已截取屏幕截图以显示当前代码的结果（我将在下面粘贴），然后我将数字放在点旁边。这些数字表示该位置有多少个点。此外，我已经把X和Y方向。
然后移动点旁边的数字来表示我想要实现的目标。以及我正在寻找的X和Y方向。
我也注意到它似乎正常化了坐标。如果我可以保留实际上最佳的X和Y位置。
这是我目前有
这就是我想要的
这是我目前的代码
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
import sys
from math import sqrt
class LogObject(QObject):
hovered = pyqtSignal()
notHovered = pyqtSignal()
class Point(QGraphicsRectItem):
def __init__(self, x, y, name):
super(Point, self).__init__(QRectF(0, 0, 30, 30))
self.setFlag(QGraphicsItem.ItemIsSelectable, True)
self.name = name
self.x = x
self.y = y
self.setBrush(QBrush(Qt.black))
self.setAcceptHoverEvents(True)
self.log = LogObject()
self.setPos(x, y)
def itemChange(self, change, value):
if change == self.ItemSelectedChange:
self.setBrush(QBrush(Qt.green) if value else QBrush(Qt.black))
return QGraphicsItem.itemChange(self, change, value)
def hoverEnterEvent(self, event):
self.setBrush(QColor("red"))
self.log.hovered.emit()
QGraphicsItem.hoverMoveEvent(self, event)
def hoverLeaveEvent(self, event):
self.setBrush(QColor("black"))
self.log.notHovered.emit()
QGraphicsItem.hoverMoveEvent(self, event)
def mousePressEvent(self, event):
print(self.name)
QGraphicsItem.mousePressEvent(self, event)
class Viewer(QGraphicsView):
photoClicked = pyqtSignal(QPoint)
rectChanged = pyqtSignal(QRect)
def __init__(self, parent):
super(Viewer, self).__init__(parent)
self.rubberBand = QRubberBand(QRubberBand.Rectangle, self)
self.setMouseTracking(True)
self.origin = QPoint()
self.changeRubberBand = False
self._zoom = 0
self._empty = True
self._scene = QGraphicsScene(self)
self.setTransformationAnchor(QGraphicsView.AnchorUnderMouse)
self.setResizeAnchor(QGraphicsView.AnchorUnderMouse)
self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
self.setFrameShape(QFrame.NoFrame)
self.area = float()
self.setPoints()
QTimer.singleShot(0, self.fitInView) # This is done so that it can fit into view on load
self.viewport().setCursor(Qt.ArrowCursor)
def setItems(self):
self.data = {'x': [-2414943.8686, -2417160.6592, -2417160.6592, -2417856.1783, -2417054.7618, -2416009.9966, -2416012.5232, -2418160.8952, -2418160.8952, -2416012.5232, -2417094.7694, -2417094.7694], 'y': [10454269.7008,
10454147.2672, 10454147.2672, 10453285.2456, 10452556.8132, 10453240.2808, 10455255.8752, 10455183.1912, 10455183.1912, 10455255.8752, 10456212.5959, 10456212.5959]}
maxX = max(self.data['x'])
minX = min(self.data['x'])
maxY = max(self.data['y'])
minY = min(self.data['y'])
distance = sqrt((maxX-minX)**2+(maxY-minY)**2)
self.area = QRectF(minX, minY, distance, distance)
self._scene.setSceneRect(QRectF(minX, -minY, distance, distance)) # Tried this but didn't seem to do anything
for i, (x, y) in enumerate(zip(self.data["x"], self.data["y"])):
p = Point(x, y, "Point__" + str(i))
p.log.hovered.connect(self.hoverChange)
p.log.notHovered.connect(self.notHoverChange)
self._scene.addItem(p)
self.setScene(self._scene)
def fitInView(self, scale=True):
rect = QRectF(self.area)
if not rect.isNull():
self.setSceneRect(rect)
unity = self.transform().mapRect(QRectF(0, 0, 1, 1))
self.scale(1 / unity.width(), 1 / unity.height())
viewrect = self.viewport().rect()
scenerect = self.transform().mapRect(rect)
factor = min(viewrect.width() / scenerect.width(),
viewrect.height() / scenerect.height())
self.scale(factor, factor)
self._zoom = 0
def setPoints(self):
self._zoom = 0
self.setItems()
self.setDragMode(self.ScrollHandDrag)
def wheelEvent(self, event):
if event.angleDelta().y() > 0:
factor = 1.25
self._zoom += 1
else:
factor = 0.8
self._zoom -= 1
if self._zoom > 0:
self.scale(factor, factor)
elif self._zoom == 0:
self.fitInView()
else:
self._zoom = 0
def hoverChange(self):
self.viewport().setCursor(Qt.PointingHandCursor)
def notHoverChange(self):
self.viewport().setCursor(Qt.ArrowCursor)
def mousePressEvent(self, event):
if event.button() == Qt.LeftButton:
self.origin = event.pos()
self.rubberBand.setGeometry(QRect(self.origin, QSize()))
self.rectChanged.emit(self.rubberBand.geometry())
self.rubberBand.show()
self.changeRubberBand = True
return
elif event.button() == Qt.MidButton:
self.viewport().setCursor(Qt.ClosedHandCursor)
self.original_event = event
handmade_event = QMouseEvent(QEvent.MouseButtonPress,QPointF(event.pos()),Qt.LeftButton,event.buttons(),Qt.KeyboardModifiers())
QGraphicsView.mousePressEvent(self,handmade_event)
super(Viewer, self).mousePressEvent(event)
def mouseReleaseEvent(self, event):
point= event.pos()
print(point)
if event.button() == Qt.LeftButton:
self.changeRubberBand = False
if self.rubberBand.isVisible():
self.rubberBand.hide()
rect = self.rubberBand.geometry()
rect_scene = self.mapToScene(rect).boundingRect()
selected = self.scene().items(rect_scene)
if selected:
print(
"".join("Item: %s\n" % child.name for child in selected)
)
else:
print(" Nothing\n")
QGraphicsView.mouseReleaseEvent(self, event)
elif event.button() == Qt.MidButton:
self.viewport().setCursor(Qt.ArrowCursor)
handmade_event = QMouseEvent(QEvent.MouseButtonRelease,QPointF(event.pos()),Qt.LeftButton,event.buttons(),Qt.KeyboardModifiers())
QGraphicsView.mouseReleaseEvent(self,handmade_event)
super(Viewer, self).mouseReleaseEvent(event)
def mouseMoveEvent(self, event):
if self.changeRubberBand:
self.rubberBand.setGeometry(QRect(self.origin, event.pos()).normalized())
self.rectChanged.emit(self.rubberBand.geometry())
QGraphicsView.mouseMoveEvent(self,event)
super(Viewer, self).mouseMoveEvent(event)
def hoverMoveEvent(self,event):
point=event.pos().toPoint()
print(point)
QGraphicsView.hoverMoveEvent(event)
class Window(QWidget):
def __init__(self):
super(Window, self).__init__()
self.viewer = Viewer(self)
self.btnLoad = QToolButton(self)
self.btnLoad.setText('Fit Into View')
self.btnLoad.clicked.connect(self.fitPoints)
VBlayout = QVBoxLayout(self)
VBlayout.addWidget(self.viewer)
HBlayout = QHBoxLayout()
HBlayout.setAlignment(Qt.AlignLeft)
HBlayout.addWidget(self.btnLoad)
VBlayout.addLayout(HBlayout)
self.viewer.fitInView()
def fitPoints(self):
self.viewer.fitInView()
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
window = Window()
window.setGeometry(500, 300, 800, 600)
window.show()
sys.exit(app.exec_())
1个回答
1
投票
投票
我们的想法是用（1，-1）缩放场景，使Y轴反转。另一方面，QGraphicsView已经有一个fitInView方法，因此我将使用它，因为您当前的方法可能会产生问题
class LogObject(QObject):
hovered = pyqtSignal()
notHovered = pyqtSignal()
class Point(QGraphicsRectItem):
def __init__(self, x, y, name):
super(Point, self).__init__(QRectF(0, 0, 30, 30))
self.setFlag(QGraphicsItem.ItemIsSelectable, True)
self.name = name
self.setBrush(QBrush(Qt.black))
self.setAcceptHoverEvents(True)
self.log = LogObject()
self.setPos(x, y)
def itemChange(self, change, value):
if change == self.ItemSelectedChange:
self.setBrush(QBrush(Qt.green) if value else QBrush(Qt.black))
return QGraphicsItem.itemChange(self, change, value)
def hoverEnterEvent(self, event):
self.setBrush(QColor("red"))
self.log.hovered.emit()
QGraphicsItem.hoverMoveEvent(self, event)
def hoverLeaveEvent(self, event):
self.setBrush(QColor("black"))
self.log.notHovered.emit()
QGraphicsItem.hoverMoveEvent(self, event)
def mousePressEvent(self, event):
print(self.name)
QGraphicsItem.mousePressEvent(self, event)
class Viewer(QGraphicsView):
photoClicked = pyqtSignal(QPoint)
rectChanged = pyqtSignal(QRect)
def __init__(self, parent):
super(Viewer, self).__init__(parent)
self.rubberBand = QRubberBand(QRubberBand.Rectangle, self)
self.setMouseTracking(True)
self.origin = QPoint()
self.changeRubberBand = False
self._zoom = 0
self._empty = True
self.setScene(QGraphicsScene(self))
self.setTransformationAnchor(QGraphicsView.AnchorUnderMouse)
self.setResizeAnchor(QGraphicsView.AnchorUnderMouse)
self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
self.setFrameShape(QFrame.NoFrame)
self.area = float()
self.setPoints()
self.viewport().setCursor(Qt.ArrowCursor)
QTimer.singleShot(0, self.reset_fit)
def setItems(self):
self.data = {
"x": [
-2414943.8686,
-2417160.6592,
-2417160.6592,
-2417856.1783,
-2417054.7618,
-2416009.9966,
-2416012.5232,
-2418160.8952,
-2418160.8952,
-2416012.5232,
-2417094.7694,
-2417094.7694,
],
"y": [
10454269.7008,
10454147.2672,
10454147.2672,
10453285.2456,
10452556.8132,
10453240.2808,
10455255.8752,
10455183.1912,
10455183.1912,
10455255.8752,
10456212.5959,
10456212.5959,
],
}
maxX = max(self.data["x"])
minX = min(self.data["x"])
maxY = max(self.data["y"])
minY = min(self.data["y"])
distance = sqrt((maxX - minX) ** 2 + (maxY - minY) ** 2)
self.area = QRectF(minX, minY, distance, distance)
self.scene().setSceneRect(
QRectF(minX, -minY, distance, distance)
) # Tried this but didn't seem to do anything
for i, (x, y) in enumerate(zip(self.data["x"], self.data["y"])):
p = Point(x, y, "Point__" + str(i))
p.log.hovered.connect(self.hoverChange)
p.log.notHovered.connect(self.notHoverChange)
self.scene().addItem(p)
def setPoints(self):
self.setItems()
self.setDragMode(self.ScrollHandDrag)
def wheelEvent(self, event):
if event.angleDelta().y() > 0:
factor = 1.25
self._zoom += 1
else:
factor = 0.8
self._zoom -= 1
if self._zoom > 0:
self.scale(factor, factor)
elif self._zoom == 0:
self.reset_fit()
else:
self._zoom = 0
def hoverChange(self):
self.viewport().setCursor(Qt.PointingHandCursor)
def notHoverChange(self):
self.viewport().setCursor(Qt.ArrowCursor)
def mousePressEvent(self, event):
if event.button() == Qt.LeftButton:
self.origin = event.pos()
self.rubberBand.setGeometry(QRect(self.origin, QSize()))
self.rectChanged.emit(self.rubberBand.geometry())
self.rubberBand.show()
self.changeRubberBand = True
return
elif event.button() == Qt.MidButton:
self.viewport().setCursor(Qt.ClosedHandCursor)
self.original_event = event
handmade_event = QMouseEvent(
QEvent.MouseButtonPress,
QPointF(event.pos()),
Qt.LeftButton,
event.buttons(),
Qt.KeyboardModifiers(),
)
QGraphicsView.mousePressEvent(self, handmade_event)
super(Viewer, self).mousePressEvent(event)
def mouseReleaseEvent(self, event):
point = event.pos()
print(self.mapToScene(point))
if event.button() == Qt.LeftButton:
self.changeRubberBand = False
if self.rubberBand.isVisible():
self.rubberBand.hide()
rect = self.rubberBand.geometry()
rect_scene = self.mapToScene(rect).boundingRect()
selected = self.scene().items(rect_scene)
if selected:
print(
"".join("Item: %s\n" % child.name for child in selected)
)
else:
print(" Nothing\n")
QGraphicsView.mouseReleaseEvent(self, event)
elif event.button() == Qt.MidButton:
self.viewport().setCursor(Qt.ArrowCursor)
handmade_event = QMouseEvent(
QEvent.MouseButtonRelease,
QPointF(event.pos()),
Qt.LeftButton,
event.buttons(),
Qt.KeyboardModifiers(),
)
QGraphicsView.mouseReleaseEvent(self, handmade_event)
super(Viewer, self).mouseReleaseEvent(event)
def mouseMoveEvent(self, event):
if self.changeRubberBand:
self.rubberBand.setGeometry(
QRect(self.origin, event.pos()).normalized()
)
self.rectChanged.emit(self.rubberBand.geometry())
QGraphicsView.mouseMoveEvent(self, event)
super(Viewer, self).mouseMoveEvent(event)
def hoverMoveEvent(self, event):
point = event.pos().toPoint()
print(point)
QGraphicsView.hoverMoveEvent(event)
def reset_fit(self):
r = self.scene().itemsBoundingRect()
self.resetTransform()
self.setSceneRect(r)
self.fitInView(r, Qt.KeepAspectRatio)
self._zoom = 0
self.scale(1, -1)
class Window(QWidget):
def __init__(self):
super(Window, self).__init__()
self.viewer = Viewer(self)
self.btnLoad = QToolButton(self)
self.btnLoad.setText("Fit Into View")
self.btnLoad.clicked.connect(self.fitPoints)
VBlayout = QVBoxLayout(self)
VBlayout.addWidget(self.viewer)
HBlayout = QHBoxLayout()
HBlayout.setAlignment(Qt.AlignLeft)
HBlayout.addWidget(self.btnLoad)
VBlayout.addLayout(HBlayout)
def fitPoints(self):
self.viewer.reset_fit()
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