[英]Using scene.addRect in for loop. How do I add a variable number to the rectangle's name?
[英]How do I animate the scene Rectangle?
我正在嘗試使用 animation 移動我的 QGraphicsScene 矩形,以獲得它移動平穩的印象。 但我不知道該怎么做。 有人可以幫我嗎? 我想知道是否可以為 Qtransform 實例設置動畫。 如果是,我該怎么做?
問題:
1 - 如何為平移 function 設置動畫,這會移動我的場景矩形。 我想為它制作動畫,因為我希望它看起來很平滑。
2 - 可以為 Qtransform 實例設置動畫嗎?
這是我的代碼:
from PyQt5.QtWidgets import QWidget, QApplication, QHBoxLayout
from PyQt5 import QtGui
from PyQt5 import QtWidgets
from PyQt5 import QtCore
class Example(QWidget):
def __init__(self, parent=None):
super(Example, self).__init__(parent) # this widget has no parent
hbox = QHBoxLayout(self)
self.setMinimumHeight(500)
self.setMinimumWidth(500)
self.button = QtWidgets.QPushButton("move scene", self) # this button is responsible to emit a signal to animate the
# scene translation
self.button.clicked.connect(self.do) # connect to the animation
self.scene = QtWidgets.QGraphicsScene() # instantiate the scene
self.view = QtWidgets.QGraphicsView(self) # instantiate the view
self.view.setScene(self.scene)
hbox.addWidget(self.view) # insert into the layout
hbox.addWidget(self.button) # insert into the layout
self.r = self.view.mapToScene(self.view.viewport().rect()).boundingRect()# take the viewport bounding rectangle
self.view.setSceneRect(self.r) # define the viewport bounding rectangle as the initial scene rectangle
self.scene.addEllipse(self.r, QtGui.QPen(QtGui.QBrush(QtCore.Qt.darkRed), 10, join=QtCore.Qt.RoundJoin))
# draw an ellipse in our scene
self.scene.setBackgroundBrush(QtGui.QBrush(QtCore.Qt.CrossPattern)) # set a grid patter to turn easier to
# see the displacements of objects
def translateSceneSmooth(self, ds: tuple) -> None:
"""
ds = (dx, dy)
:param ds: is the differential in x and y.
:return: None
"""
self.view.setSceneRect(self.view.sceneRect().translated(*ds)) # I want that the animation pass a interpolation
# of a tuple here: starting at (0, 0) and ending at (100, 100)
# I don't know if this approach is correct.
# Because maybe it will not move 100 px.if I have a list of numbers in the form passing through the function:
# [0, 10, 20, 50, 70, 100] maybe it'll move 0+10+20+50+70+100 = 250 px
def do(self, duration=100):
"""
I want the scene rectangle to move smoothly
"""
print('Starting animation')
self._animation = QtCore.QVariantAnimation()
self._animation.setStartValue(0)
self._animation.setEndValue(1000)
self._animation.setDuration(duration)
self._animation.start(QtCore.QAbstractAnimation.DeleteWhenStopped)
self._animation.valueChanged.connect(self.translateSceneSmooth)
print('Ending animation')
if __name__ == "__main__":
app = QApplication([])
ex = Example()
ex.show()
app.exec_()
如果要移動sceneRect,則通過計算開始和結束矩形來生成矩形的animation。 另一方面,默認情況下,按下的信號傳遞一個覆蓋默認值“duration”的 boolean,一個可能的解決方案是使用 pyqtSlot 裝飾器使連接簽名顯式:
from PyQt5 import QtCore, QtGui, QtWidgets
class Example(QtWidgets.QWidget):
def __init__(self, parent=None):
super(Example, self).__init__(parent)
self.setMinimumSize(500, 500)
self.button = QtWidgets.QPushButton("move scene")
# scene translation
self.button.clicked.connect(self.do)
self.scene = QtWidgets.QGraphicsScene()
self.view = QtWidgets.QGraphicsView()
self.view.setScene(self.scene)
hbox = QtWidgets.QHBoxLayout(self)
hbox.addWidget(self.view)
hbox.addWidget(self.button)
self.r = self.view.mapToScene(self.view.viewport().rect()).boundingRect()
self.view.setSceneRect(self.r)
self.scene.addEllipse(
self.r,
QtGui.QPen(QtGui.QBrush(QtCore.Qt.darkRed), 10, join=QtCore.Qt.RoundJoin),
)
self.scene.setBackgroundBrush(QtGui.QBrush(QtCore.Qt.CrossPattern))
@QtCore.pyqtSlot()
def do(self, duration=100):
"""
I want the scene rectangle to move smoothly
"""
ds = QtCore.QPointF(100, 100)
current_rect = self.view.sceneRect()
next_rect = current_rect.translated(ds)
self._animation = QtCore.QVariantAnimation()
self._animation.setStartValue(current_rect)
self._animation.setEndValue(next_rect)
self._animation.setDuration(duration)
self._animation.valueChanged.connect(self.view.setSceneRect)
self._animation.finished.connect(lambda: print("Ending animation"))
self._animation.start(QtCore.QAbstractAnimation.DeleteWhenStopped)
print("Starting animation")
if __name__ == "__main__":
app = QtWidgets.QApplication([])
ex = Example()
ex.show()
app.exec_()
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.