今天學有所成,趕緊記下今天的成果
之前三篇文章分別演示了空間的大小改變,移動,及顏色變化。在后續研究旋轉的過程中即為艱難
如果你是使用pyqt4,那么使用QGraphicsItemAnimation便可以輕松達到旋轉的效果,這里不再詳述
可惜到了pyqt5
於是查閱各種英文資料,我分別嘗試了QGraphicsRotation,QGraphicsTransform,QTransform效果都不太理想,QTransform是可以實現的,但是太復雜
最后我找到了一種極為簡單的方法就是在使用QGraphicsView的各種item時,可以直接setRotation讓對象旋轉起來,下面來看看代碼,這里直接在對象上寫一個動畫:
class Ball(QObject): def __init__(self): super().__init__() pixmap = QPixmap("../star.png") scaledPixmap = pixmap.scaled(50, 55) self.animation() self.pixmap_item = QGraphicsPixmapItem(scaledPixmap) self.pixmap_item.setTransformOriginPoint(25, 27.5) # 設置中心為旋轉 self._set_pos(QPointF(5, 30)) # 設置圖標的初始位置 def _set_pos(self, pos): self.pixmap_item.setPos(pos) def _set_rotation(self, angle): self.pixmap_item.setRotation(angle.x()) # 旋轉度數 def animation(self): self.anim = QPropertyAnimation(self, b'pos') self.anim.setDuration(1000) self.anim.setStartValue(QPointF(5, 30)) self.anim.setKeyValueAt(0.3, QPointF(144, 30)) self.anim.setKeyValueAt(0.5, QPointF(54, 90)) self.anim.setKeyValueAt(0.8, QPointF(240, 250)) self.anim.setEndValue(QPointF(300, 60)) self.anim2 = QPropertyAnimation(self, b'rotation') self.anim2.setDuration(1000) self.anim2.setStartValue(QPointF(0, 1)) self.anim2.setEndValue(QPointF(360, 1)) pos = pyqtProperty(QPointF, fset=_set_pos) rotation = pyqtProperty(QPointF, fset=_set_rotation)
這里可以看到我用QpointF把數字傳進去,然后再取angle.x()作為度數,這樣對象就可以旋轉了
下面我對對象進行了加工,結合前面幾篇動畫文章,我做了一個按一定軌跡自轉的動畫。
這里使用了QGraphicsView界面,我們可以通過QGraphicsView這個界面創建各種QGraphicsScene場景,然后就可以把各種對象弄到這個場景里面去,非常方面
#!/usr/bin/python3 # -*- coding: utf-8 -*- """ Author: semishigure Website: zetcode.com Last edited: 2018.03.09 """ from PyQt5.QtCore import * from PyQt5.QtGui import * from PyQt5.QtWidgets import * import cgitb import sys cgitb.enable(format='text') # 解決pyqt5異常只要進入事件循環,程序就崩潰,而沒有任何提示 class Ball(QObject): def __init__(self): super().__init__() pixmap = QPixmap("../star.png") scaledPixmap = pixmap.scaled(50, 55) self.animation() self.pixmap_item = QGraphicsPixmapItem(scaledPixmap) self.pixmap_item.setTransformOriginPoint(25, 27.5) # 設置中心為旋轉 self._set_pos(QPointF(5, 30)) # 設置圖標的初始位置 def _set_pos(self, pos): self.pixmap_item.setPos(pos) def _set_rotation(self, angle): self.pixmap_item.setRotation(angle.x()) # 旋轉度數 def animation(self): self.anim = QPropertyAnimation(self, b'pos') self.anim.setDuration(1000) self.anim.setStartValue(QPointF(5, 30)) self.anim.setKeyValueAt(0.3, QPointF(144, 30)) self.anim.setKeyValueAt(0.5, QPointF(54, 90)) self.anim.setKeyValueAt(0.8, QPointF(240, 250)) self.anim.setEndValue(QPointF(300, 60)) self.anim2 = QPropertyAnimation(self, b'rotation') self.anim2.setDuration(1000) self.anim2.setStartValue(QPointF(0, 1)) self.anim2.setEndValue(QPointF(360, 1)) pos = pyqtProperty(QPointF, fset=_set_pos) rotation = pyqtProperty(QPointF, fset=_set_rotation) class Myview(QGraphicsView): def __init__(self): super().__init__() self._set_color(QColor(105, 105, 105)) self.iniAnimation() def _set_color(self, col): self.palette = QPalette() # self.palette.setColor(self.backgroundRole(), col) self.palette.setBrush(self.backgroundRole(), col) self.setPalette(self.palette) def iniAnimation(self): self.anim3 = QPropertyAnimation(self, b'color') self.anim3.setDuration(1000) self.anim3.setStartValue(QColor(105, 105, 105)) self.anim3.setKeyValueAt(0.1, QColor(255, 255, 240)) self.anim3.setKeyValueAt(0.3, QColor(219, 225, 171)) self.anim3.setKeyValueAt(0.7, QColor(148, 214, 184)) self.anim3.setEndValue(QColor(86, 199, 170)) color = pyqtProperty(QColor, fset=_set_color) class MainWindow(Myview): def __init__(self): super().__init__() self.initView() self.iniui() def initView(self): self.ball = Ball() self.scene = QGraphicsScene(self) self.scene.setSceneRect(0, 0, 300, 300) self.scene.addItem(self.ball.pixmap_item) self.setScene(self.scene) self.setWindowTitle("Ball animation") self.setRenderHint(QPainter.Antialiasing) self.setGeometry(300, 300, 500, 350) self.show() def iniui(self): self.btn = QPushButton("開始") self.maingrid = QHBoxLayout() self.maingrid.addStretch(1) self.maingrid.addWidget(self.btn) self.btn.clicked.connect(self.runAnim) self.maingrid2 = QVBoxLayout() self.maingrid2.addStretch(1) self.maingrid2.addLayout(self.maingrid) self.setLayout(self.maingrid2) def runAnim(self): self.ball.anim.start() self.ball.anim2.start() self.anim3.start() if __name__ == '__main__': app = QApplication(sys.argv) ex = MainWindow() sys.exit(app.exec_())
界面效果:
備注:
讓我們創建好QGraphicsView后,需要再創建一個QGraphicsScene場景,然后通過self.scene.addItem(self.ball.pixmap_item)把對象添加到場景里面,最后再通過self.setScene(self.scene)把場景添加進界面即可