116 lines
4.0 KiB
Python
116 lines
4.0 KiB
Python
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"""
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Zentrales Canvas-Widget: zeigt das Logo mit Zoom, Pan und Rasterlinien an.
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"""
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from __future__ import annotations
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from PySide6.QtWidgets import QGraphicsView, QGraphicsScene, QGraphicsPixmapItem
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from PySide6.QtCore import Qt, Signal, QPointF
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from PySide6.QtGui import (
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QPainter, QPen, QColor, QPixmap, QWheelEvent, QMouseEvent,
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)
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class LogoCanvas(QGraphicsView):
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zoom_changed = Signal(float)
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def __init__(self, parent=None):
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super().__init__(parent)
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self._scene = QGraphicsScene(self)
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self.setScene(self._scene)
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self._pixmap_item: QGraphicsPixmapItem | None = None
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self._overlay_item: QGraphicsPixmapItem | None = None
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self._zoom = 1.0
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self._pan_active = False
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self._pan_start = QPointF()
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self.setRenderHints(
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QPainter.RenderHint.Antialiasing
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| QPainter.RenderHint.SmoothPixmapTransform
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)
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self.setDragMode(QGraphicsView.DragMode.NoDrag)
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self.setTransformationAnchor(QGraphicsView.ViewportAnchor.AnchorUnderMouse)
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self.setBackgroundBrush(QColor("#2b2b2b"))
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self.setMinimumSize(400, 300)
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self._draw_checkerboard()
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def _draw_checkerboard(self):
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"""Schachbrettmuster als Transparenz-Indikator."""
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self.setStyleSheet("""
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QGraphicsView {
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background-color: #2b2b2b;
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}
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""")
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def set_original_image(self, pixmap: QPixmap):
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"""Zeigt das Original-PNG an."""
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if self._pixmap_item:
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self._scene.removeItem(self._pixmap_item)
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self._pixmap_item = self._scene.addPixmap(pixmap)
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self._pixmap_item.setZValue(0)
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self.fitInView(self._pixmap_item, Qt.AspectRatioMode.KeepAspectRatio)
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self._zoom = self.transform().m11()
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self.zoom_changed.emit(self._zoom)
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def set_overlay(self, pixmap: QPixmap):
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"""Zeigt die gerenderten Vektorpfade als Overlay an."""
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if self._overlay_item:
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self._scene.removeItem(self._overlay_item)
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self._overlay_item = self._scene.addPixmap(pixmap)
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self._overlay_item.setZValue(1)
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self._overlay_item.setOpacity(0.85)
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def clear_overlay(self):
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if self._overlay_item:
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self._scene.removeItem(self._overlay_item)
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self._overlay_item = None
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# --- Zoom via Mausrad ---
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def wheelEvent(self, event: QWheelEvent):
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factor = 1.15 if event.angleDelta().y() > 0 else 1 / 1.15
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self._zoom *= factor
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self.scale(factor, factor)
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self.zoom_changed.emit(self._zoom)
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# --- Pan via mittlere Maustaste oder Leertaste + Links ---
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def mousePressEvent(self, event: QMouseEvent):
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if event.button() == Qt.MouseButton.MiddleButton:
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self._pan_active = True
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self._pan_start = event.position()
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self.setCursor(Qt.CursorShape.ClosedHandCursor)
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else:
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super().mousePressEvent(event)
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def mouseMoveEvent(self, event: QMouseEvent):
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if self._pan_active:
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delta = event.position() - self._pan_start
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self._pan_start = event.position()
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self.horizontalScrollBar().setValue(
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self.horizontalScrollBar().value() - int(delta.x())
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)
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self.verticalScrollBar().setValue(
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self.verticalScrollBar().value() - int(delta.y())
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)
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else:
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super().mouseMoveEvent(event)
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def mouseReleaseEvent(self, event: QMouseEvent):
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if event.button() == Qt.MouseButton.MiddleButton:
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self._pan_active = False
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self.setCursor(Qt.CursorShape.ArrowCursor)
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else:
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super().mouseReleaseEvent(event)
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def set_zoom(self, zoom: float):
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factor = zoom / self._zoom
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self._zoom = zoom
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self.scale(factor, factor)
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self.zoom_changed.emit(self._zoom)
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def fit_to_view(self):
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if self._pixmap_item:
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self.fitInView(self._pixmap_item, Qt.AspectRatioMode.KeepAspectRatio)
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self._zoom = self.transform().m11()
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self.zoom_changed.emit(self._zoom)
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