Re: [問題] PySide2 使用滑鼠旋轉圖片

[skyconquer (梅郭曲)]

※ 引述《janice001 ()》之銘言：
: 如標題
: 請問如何使用 PySide2
: 要如何才可以像 power point 那樣
: 可以使用滑鼠旋轉圖片?
: 感恩
: 更新補上影片
: https://i.imgur.com/iUDws4r.gif


試著寫了一些有類似效果的程式碼：

https://imgur.com/MGyyvV0  點進去可以看到動起來的樣子


程式碼在此:

# This Python file uses the following encoding: utf-8
# Made by Yu Tso (Roy) for answering the question on PTT:
# 文章代碼(AID): #1UnZPCVa (Python) [ptt.cc] [問題] PySide2 使用滑鼠旋轉圖

import sys
from PySide2.QtWidgets import QApplication, QMainWindow
from PySide2.QtWidgets import QGraphicsView, QGraphicsItem
from PySide2.QtWidgets import QGraphicsScene, QGraphicsPixmapItem
from PySide2.QtGui import QPixmap, QImage
from PySide2 import QtCore
import numpy as np


class GraphicsScene(QGraphicsScene):
    def __init__(self):
        QGraphicsScene.__init__(self)

        self.clickPos = QtCore.QPointF(0.0, 0.0)

    def mouseMoveEvent(self, e):
        QGraphicsScene.mouseMoveEvent(self,e)
        for i in self.selectedItems():
            centerPoint = (i.boundingRect().topLeft() +
i.boundingRect().bottomRight())/2
            i.setTransformOriginPoint(centerPoint)
            v1 = self.clickPos - centerPoint
            v2 = e.scenePos() - centerPoint
            l1 = np.linalg.norm([v1.x(), v1.y()])
            l2 = np.linalg.norm([v2.x(), v2.y()])
            sine = np.cross([v1.x(),v1.y()], [v2.x(),v2.y()])/(l1*l2)
            new_angle = np.arcsin(sine)
            i.setRotation(i.rotation() + new_angle)

    def mousePressEvent(self,e):
        QGraphicsScene.mousePressEvent(self, e)
        self.clickPos = e.scenePos()

    def mouseReleaseEvent(self,e):
        QGraphicsScene.mouseReleaseEvent(self,e)
        self.clickPos = QtCore.QPointF(0.0, 0.0)

    def addItem(self, item):
        QGraphicsScene.addItem(self, item)
        self.items()[-1].setFlags(QGraphicsItem.ItemSendsScenePositionChanges
| QGraphicsItem.ItemIsSelectable)


if __name__ == "__main__":
    app = QApplication([])
    image = QImage("fox1.jpeg")
    item = QGraphicsPixmapItem(QPixmap().fromImage(image))
    scene = GraphicsScene()
    scene.addItem(item)
    view = QGraphicsView(scene)
    view.resize(500,500)
    view.show()


如果有更好的實作方法，希望版友們不吝指教分享，謝謝。


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※ 文章網址: https://www.ptt.cc/bbs/Python/M.1590476495.A.63D.html
※ 編輯: skyconquer (140.135.253.172 臺灣), 05/26/2020 15:11:56
推 janice001: 先跪謝了
→ skyconquer: 不會