René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Shape Manipulation Issues with Logarithmic Scale Engine","articleBody":"When using shapes like `AnnotatedRectangle` with a logarithmic scale engine on the `BasePlot`, there are significant problems with shape resizing and movement. While shapes work correctly in linear scale mode, switching to logarithmic scale causes erratic behavior:\n- When trying to move the shapes, the entire plot resizes erratically while moving.\n- Shape manipulation doesn't follow mouse movements correctly.\n\nCode sample:\n```\nimport sys\nfrom PySide6.QtWidgets import QApplication, QMainWindow, QWidget, QVBoxLayout\nfrom PySide6.QtCore import Qt\nfrom plotpy.plot import BasePlot, PlotManager\nfrom plotpy.tools import SelectTool, AnnotatedRectangleTool\n\nclass Plot(QMainWindow):\n    def __init__(self):\n        super().__init__()\n        self.setWindowTitle(\"Base Plot\")\n        self.setGeometry(100, 100, 800, 600)\n\n        # Create the main widget and layout\n        main_widget = QWidget()\n        self.setCentralWidget(main_widget)\n        layout = QVBoxLayout(main_widget)\n\n        # Create PlotWidget\n        self.plot = BasePlot()\n        self.plot.set_axis_scale(BasePlot.X_BOTTOM, \"log\", autoscale=False)\n        self.plot.set_axis_scale(BasePlot.Y_LEFT, \"log\", autoscale=False)\n\n        # self.plot.setMouseTracking(True)\n        layout.addWidget(self.plot)\n\n        self.manager = PlotManager(self.plot)\n        self.manager.add_plot(self.plot)\n\n        self.select_tool = self.manager.add_tool(SelectTool)\n        self.select_tool.activate()\n        self.rect_tool = self.manager.add_tool(AnnotatedRectangleTool, handle_final_shape_cb=self.handle_final_shape, switch_to_default_tool=True)\n\n        self.plot.setContextMenuPolicy(Qt.ContextMenuPolicy.ActionsContextMenu)\n        self.plot.addAction(\"Add Rectangle\", lambda: self.rect_tool.activate())\n\n    def handle_final_shape(self, shape):\n        print(f\"Final shape: {shape}\")\n        self.plot.unselect_all()\n        self.plot.select_item(shape)\n\n    def add_shape(self, tool):\n        self.manager.get_tool(tool).activate()\n\nif __name__ == '__main__':\n    app = QApplication(sys.argv)\n    window = Plot()\n    window.show()\n    sys.exit(app.exec())\n```","author":{"url":"https://github.com/imad-miftek","@type":"Person","name":"imad-miftek"},"datePublished":"2025-03-19T02:45:13.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/37/PlotPy/issues/37"}