129 lines
5.2 KiB
Python
129 lines
5.2 KiB
Python
"""Widget that renders an image and draws detection overlays.
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Overlay visibility and the confidence threshold are applied at paint time, so
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toggling them is instant. One detection can be *highlighted* (selected in the
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detail table) — it is drawn boldly even if below the threshold, while the others
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dim, so the user can inspect exactly what the detector found.
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"""
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from __future__ import annotations
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import cv2
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import numpy as np
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from PySide6.QtCore import QPointF, QRectF, Qt
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from PySide6.QtGui import QBrush, QColor, QFont, QImage, QPainter, QPen, QPolygonF
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from PySide6.QtWidgets import QWidget
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from ..config import OverlayConfig
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from ..core.detection.types import CensorType, Detection
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class ImageView(QWidget):
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def __init__(self, overlay_cfg: OverlayConfig, parent: QWidget | None = None) -> None:
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super().__init__(parent)
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self._cfg = overlay_cfg
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self._qimage: QImage | None = None
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self._dets: list[Detection] = []
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self._overlay_enabled = True
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self._threshold = 0.0
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self._highlight: int | None = None
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self.setMinimumSize(480, 360)
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# ------------------------------------------------------------------ slots
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def set_image(self, image_bgr: np.ndarray | None, dets: list[Detection]) -> None:
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if image_bgr is None:
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self._qimage = None
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else:
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rgb = np.ascontiguousarray(cv2.cvtColor(image_bgr, cv2.COLOR_BGR2RGB))
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h, w, ch = rgb.shape
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# .copy() so the QImage owns its pixels (the numpy buffer can be freed).
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self._qimage = QImage(rgb.data, w, h, ch * w, QImage.Format_RGB888).copy()
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self._dets = dets
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self._highlight = None
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self.update()
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def set_overlay_enabled(self, enabled: bool) -> None:
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self._overlay_enabled = enabled
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self.update()
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def set_threshold(self, threshold: float) -> None:
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self._threshold = threshold
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self.update()
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def set_highlight(self, index: int | None) -> None:
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self._highlight = index
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self.update()
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# ------------------------------------------------------------------ paint
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def _color(self, ctype: CensorType) -> QColor:
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r, g, b = self._cfg.colors.get(ctype.value, (255, 0, 0))
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return QColor(r, g, b)
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def paintEvent(self, event) -> None: # noqa: N802 - Qt signature
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painter = QPainter(self)
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painter.fillRect(self.rect(), QColor(18, 18, 18))
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if self._qimage is None:
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painter.setPen(QColor(160, 160, 160))
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painter.drawText(self.rect(), Qt.AlignCenter, "Откройте папку с картинками (Файл → Открыть папку…)")
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painter.end()
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return
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iw, ih = self._qimage.width(), self._qimage.height()
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scale = min(self.width() / iw, self.height() / ih)
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dw, dh = iw * scale, ih * scale
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ox, oy = (self.width() - dw) / 2, (self.height() - dh) / 2
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painter.setRenderHint(QPainter.SmoothPixmapTransform, True)
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painter.drawImage(QRectF(ox, oy, dw, dh), self._qimage)
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if self._overlay_enabled and self._dets:
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painter.setRenderHint(QPainter.Antialiasing, True)
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for i, d in enumerate(self._dets):
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highlighted = i == self._highlight
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# A highlighted detection is always drawn; others respect the threshold.
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if not highlighted and d.score < self._threshold:
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continue
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dim = self._highlight is not None and not highlighted
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self._draw_detection(painter, d, ox, oy, scale, highlighted, dim)
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painter.end()
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def _draw_detection(
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self, painter: QPainter, d: Detection, ox: float, oy: float,
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scale: float, highlighted: bool, dim: bool,
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) -> None:
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color = self._color(d.type)
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width = self._cfg.line_width * (2 if highlighted else 1)
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pen_color = QColor(color)
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if dim:
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pen_color.setAlpha(70)
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painter.setPen(QPen(pen_color, width))
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fill = QColor(color)
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fill.setAlpha(0 if dim else (self._cfg.fill_alpha * 2 if highlighted else self._cfg.fill_alpha))
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painter.setBrush(QBrush(fill))
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points = d.polygon if len(d.polygon) >= 3 else self._bbox_points(d.bbox)
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poly = QPolygonF([QPointF(ox + x * scale, oy + y * scale) for x, y in points])
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painter.drawPolygon(poly)
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if self._cfg.show_labels and not dim:
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x, y, _w, _h = d.bbox
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self._draw_label(painter, f"{d.type.value} {d.score:.2f}", ox + x * scale, oy + y * scale, color)
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@staticmethod
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def _bbox_points(bbox: tuple[int, int, int, int]) -> list[tuple[int, int]]:
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x, y, w, h = bbox
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return [(x, y), (x + w, y), (x + w, y + h), (x, y + h)]
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def _draw_label(self, painter: QPainter, text: str, x: float, y: float, color: QColor) -> None:
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font = QFont()
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font.setPointSize(9)
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painter.setFont(font)
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metrics = painter.fontMetrics()
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tw = metrics.horizontalAdvance(text) + 8
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th = metrics.height() + 2
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bg = QRectF(x, max(0.0, y - th), tw, th)
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painter.fillRect(bg, color)
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painter.setPen(QColor(0, 0, 0))
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painter.drawText(bg, Qt.AlignCenter, text)
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