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GUI_draft.py 12.1 KiB
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  • import sys
    import numpy as np
    
    from PyQt5.QtWidgets import (
        QApplication, QMainWindow, QGraphicsView, QGraphicsScene,
        QGraphicsEllipseItem, QGraphicsPixmapItem, QPushButton,
        QHBoxLayout, QVBoxLayout, QWidget, QFileDialog
    )
    from PyQt5.QtGui import QPixmap, QPen, QBrush
    from PyQt5.QtCore import Qt, QRectF
    
    import math
    
    
    
    class PointItem(QGraphicsEllipseItem):
        """
        Represents a single draggable point on the scene.
        """
        def __init__(self, x, y, radius=4, parent=None):
            super().__init__(x - radius, y - radius, 2*radius, 2*radius, parent)
            self._x = x
            self._y = y
            self._r = radius
    
            self.setBrush(QBrush(Qt.red))
            self.setPen(QPen(Qt.red))
    
        def get_pos(self):
            """Return the (x, y) of this point in scene coords."""
            return (self._x, self._y)
    
        def set_pos(self, x, y):
            """
            Move point to (x,y). 
            This also updates the ellipse rectangle so the visual dot moves.
            """
            self._x = x
            self._y = y
            self.setRect(x - self._r, y - self._r, 2*self._r, 2*self._r)
    
        def distance_to(self, x_other, y_other):
            """Euclidean distance from this point to arbitrary (x_other, y_other)."""
            dx = self._x - x_other
            dy = self._y - y_other
            return math.sqrt(dx*dx + dy*dy)
    
    
    
    
    class ImageGraphicsView(QGraphicsView):
        """
        Custom class inheriting from QGraphicsView for displaying an image and placing red dots.
        """
        def __init__(self, parent=None):
            super().__init__(parent)
    
            # Create scene and add it to the view
            self.scene = QGraphicsScene(self)
            self.setScene(self.scene)
    
            # Zoom around mouse pointer
            self.setTransformationAnchor(QGraphicsView.AnchorUnderMouse)
    
            # Image item
            self.image_item = QGraphicsPixmapItem()
            self.scene.addItem(self.image_item)
    
            # Points and dot items
            self.points = []
            self.editor_mode = False
            self.dot_radius = 4
    
            # Enable built-in panning around image, but force arrow cursor initially
            self.setDragMode(QGraphicsView.ScrollHandDrag)
            self.viewport().setCursor(Qt.ArrowCursor)
    
            # Track clicking vs. dragging
            self._mouse_pressed = False
            self._press_view_pos = None
            self._drag_threshold = 5
            self._was_dragging = False
    
            self._dragging_idx = None
            self._drag_offset = (0, 0)
    
    
        def load_image(self, image_path):
            """Load an image and fit it in the view."""
            pixmap = QPixmap(image_path)
    
            if not pixmap.isNull():
                self.image_item.setPixmap(pixmap)
    
                # Avoid TypeError by converting to QRectF
                self.setSceneRect(QRectF(pixmap.rect()))
    
                # Clear existing dots from previous image
                self.points.clear()
    
                # Reset transform then fit image in view
                self.resetTransform()
                self.fitInView(self.image_item, Qt.KeepAspectRatio)
    
        def set_editor_mode(self, mode: bool):
            """If True: place/remove dots; if False: do nothing on click."""
            self.editor_mode = mode
    
        def mousePressEvent(self, event):
            if event.button() == Qt.LeftButton:
                self._mouse_pressed = True
                self._was_dragging = False
                self._press_view_pos = event.pos()
    
    
                if self.editor_mode:
                    # Check if we're near a point
                    idx = self._find_point_near(event.pos(), threshold=10)
                    if idx is not None:
                        # Start dragging that point
                        self._dragging_idx = idx
                        # Compute offset so point doesn't jump if clicked off-center
                        scene_pos = self.mapToScene(event.pos())
                        px, py = self.points[idx].get_pos()
                        self._drag_offset = (scene_pos.x() - px, scene_pos.y() - py)
    
                        # Temporarily disable QGraphicsView's panning
                        self.setDragMode(QGraphicsView.NoDrag)
                        self.viewport().setCursor(Qt.ClosedHandCursor)
                        return
                    else:
                        # Not near a point, so we do normal panning
                        self.setDragMode(QGraphicsView.ScrollHandDrag)
                        self.viewport().setCursor(Qt.ClosedHandCursor)
                else:
                    # Editor mode is off => always do normal panning
                    self.setDragMode(QGraphicsView.ScrollHandDrag)
                    self.viewport().setCursor(Qt.ClosedHandCursor)
    
    
            elif event.button() == Qt.RightButton:
                # If Editor Mode is on remove the nearest dot
                if self.editor_mode:
                    self._remove_point(event.pos())
    
            super().mousePressEvent(event)
    
    
        def mouseMoveEvent(self, event):
    
            if self._dragging_idx is not None:
                # Move that point to new coords
                scene_pos = self.mapToScene(event.pos())
                x_new = scene_pos.x() - self._drag_offset[0]
                y_new = scene_pos.y() - self._drag_offset[1]
    
                self.points[self._dragging_idx].set_pos(x_new, y_new)
                return  # Skip QGraphicsView's panning logic
            else:
                # Old logic: if movement > threshold -> set _was_dragging = True
                if self._mouse_pressed and (event.buttons() & Qt.LeftButton):
                    dist = (event.pos() - self._press_view_pos).manhattanLength()
                    if dist > self._drag_threshold:
                        self._was_dragging = True
    
                super().mouseMoveEvent(event)
    
    
    
        def mouseReleaseEvent(self, event):
    
    
            if event.button() == Qt.LeftButton and self._mouse_pressed:
                self._mouse_pressed = False
                self.viewport().setCursor(Qt.ArrowCursor)
    
    
                # If we were dragging a point, stop.
                if self._dragging_idx is not None:
                    self._dragging_idx = None
                    self._drag_offset = (0, 0)
                    self.setDragMode(QGraphicsView.ScrollHandDrag)
                else:
                    # We were NOT dragging a point => check if it was a click to add a new point
                    if not self._was_dragging and self.editor_mode:
    
                        self._add_point(event.pos())
    
                self._was_dragging = False
    
    
        def wheelEvent(self, event):
            """Mouse wheel = zoom."""
            zoom_in_factor = 1.25
            zoom_out_factor = 1 / zoom_in_factor
    
            if event.angleDelta().y() > 0:
                self.scale(zoom_in_factor, zoom_in_factor)
            else:
                self.scale(zoom_out_factor, zoom_out_factor)
    
            event.accept()
    
    
        # -------------- Red Dots --------------
        def _add_point(self, view_pos):
            """Add a red dot at scene coords corresponding to view_pos."""
            scene_pos = self.mapToScene(view_pos)
            x, y = scene_pos.x(), scene_pos.y()
    
    
            dot = PointItem(x, y, radius=self.dot_radius)
            self.points.append(dot)
    
            self.scene.addItem(dot)
    
        def _remove_point(self, view_pos):
            """Right-click: remove nearest dot if within threshold."""
            scene_pos = self.mapToScene(view_pos)
            x_click, y_click = scene_pos.x(), scene_pos.y()
    
            threshold = 10
            closest_idx = None
            min_dist = float('inf')
    
    
            for i, point_item in enumerate(self.points):
                dist = point_item.distance_to(x_click, y_click)
                if dist < min_dist:
                    min_dist = dist
    
            # Remove if within threshold
            if closest_idx is not None and min_dist <= threshold:
                self.scene.removeItem(self.points[closest_idx])
    
                del self.points[closest_idx]
    
        def _create_dot_item(self, x, y):
            """Helper for creating a small red ellipse item."""
            r = self.dot_radius
            ellipse = QGraphicsEllipseItem(x - r, y - r, 2*r, 2*r)
            ellipse.setBrush(QBrush(Qt.red))
            ellipse.setPen(QPen(Qt.red))
            return ellipse
    
        def _clear_point_items(self):
            """Remove all dot items from the scene."""
    
            for p in self.points:
                self.scene.removeItem(p)
                self.points.clear()
    
        def _find_point_near(self, view_pos, threshold=10):
            scene_pos = self.mapToScene(view_pos)
            x_click, y_click = scene_pos.x(), scene_pos.y()
    
            closest_idx = None
            min_dist = float('inf')
    
            for i, p in enumerate(self.points):
                dist = p.distance_to(x_click, y_click)
                if dist < min_dist:
                    min_dist = dist
                    closest_idx = i
    
            if closest_idx is not None and min_dist <= threshold:
                return closest_idx
            return None
    
    
    
    
    
    
    class MainWindow(QMainWindow):
        """
        Main window with:
          - Button to load in image
          - Editor mode toggle button
          - Button for exporting placed points
        """
        def __init__(self):
            super().__init__()
            self.setWindowTitle("Test GUI")
    
            main_widget = QWidget()
            main_layout = QVBoxLayout(main_widget)
    
            self.image_view = ImageGraphicsView()
            main_layout.addWidget(self.image_view)
    
            btn_layout = QHBoxLayout()
    
            # Load Image
            self.btn_load_image = QPushButton("Load Image")
            self.btn_load_image.clicked.connect(self.load_image)
            btn_layout.addWidget(self.btn_load_image)
    
            # Editor Mode
            self.btn_editor_mode = QPushButton("Editor Mode: OFF")
            self.btn_editor_mode.setCheckable(True)
            self.btn_editor_mode.setStyleSheet("background-color: lightgray;")
            self.btn_editor_mode.clicked.connect(self.toggle_editor_mode)
            btn_layout.addWidget(self.btn_editor_mode)
    
            # Export Points
            self.btn_export_points = QPushButton("Export Points")
            self.btn_export_points.clicked.connect(self.export_points)
            btn_layout.addWidget(self.btn_export_points)
    
            # Remove Points
            self.btn_clear_points = QPushButton("Clear Points")
            self.btn_clear_points.clicked.connect(self.clear_points)
            btn_layout.addWidget(self.btn_clear_points)
    
    
            main_layout.addLayout(btn_layout)
            self.setCentralWidget(main_widget)
            self.resize(900, 600)
    
        def load_image(self):
            """Open a file dialog to pick an image then load it."""
            options = QFileDialog.Options()
            file_path, _ = QFileDialog.getOpenFileName(
                self, "Open Image", "",
                "Images (*.png *.jpg *.jpeg *.bmp *.tif)",
                options=options
            )
            if file_path:
                self.image_view.load_image(file_path)
    
        def toggle_editor_mode(self):
            """Toggle whether left-click places dots and right-click removes dots."""
            is_checked = self.btn_editor_mode.isChecked()
            self.image_view.set_editor_mode(is_checked)
    
            if is_checked:
                self.btn_editor_mode.setText("Editor Mode: ON")
                self.btn_editor_mode.setStyleSheet("background-color: #ffcccc;")
            else:
                self.btn_editor_mode.setText("Editor Mode: OFF")
                self.btn_editor_mode.setStyleSheet("background-color: lightgray;")
    
        def export_points(self):
            """Save the list of dot coords to a .npy file."""
            options = QFileDialog.Options()
            file_path, _ = QFileDialog.getSaveFileName(
                self, "Export Points", "",
                "NumPy Files (*.npy);;All Files (*)",
                options=options
            )
            if file_path:
                points_array = np.array(self.image_view.points)
                np.save(file_path, points_array)
                print(f"Exported {len(points_array)} points to {file_path}")
    
    
        def clear_points(self):
            """Remove all placed points (list & scene)."""
            self.image_view.points.clear()
            self.image_view._clear_point_items()
    
    
    
    def main():
        app = QApplication(sys.argv)
        window = MainWindow()
        window.show()
        sys.exit(app.exec_())
    
    
    if __name__ == '__main__':
        main()