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import errno
import os
import YOSO
from PyQt5.QtCore import (pyqtSlot, QIODevice,
QModelIndex, QPointF, QRectF, QSaveFile, Qt)
from PyQt5.QtGui import QColor, QPen, QPixmap, QTransform
from PyQt5.QtWidgets import (QGraphicsItem, QGraphicsRectItem,
QGraphicsScene, QGraphicsView)
BBOX = QGraphicsItem.UserType + 1
def _mkRectF(p1, p2):
rect = QRectF(p1.x(), p1.y(), p2.x() - p1.x(), p2.y() - p1.y())
return rect.normalized()
class BoundingBoxItem(QGraphicsRectItem):
_cls = None
def __init__(self, cls, rect, model):
super().__init__(rect)
self._setClass(cls, model)
self.setAcceptDrops(True)
@property
def number(self):
return self._cls
def type(self):
return BBOX
def _setClass(self, cls, model):
self._cls = cls
idx = model.findClass(self._cls)
(hue, sat, val) = model.hsvF(self._cls)
pen = QPen(QColor.fromHsvF(hue, sat, val, 0.6), 3)
self.setPen(pen)
if idx.isValid():
self.setToolTip(idx.data(Qt.DisplayRole))
else:
self.setToolTip('{} - <unknown>'.format(cls))
def dragEnterEvent(self, event):
event.accept()
def dropEvent(self, event):
cls = int(event.mimeData().text())
self._setClass(cls, self.scene().model)
self.scene().saveLabels()
event.accept()
class Scene(QGraphicsScene):
_bbox_pen = None
_bbox_start_pos = None
_default_class = None
_guide_pen = None
_image = None
_img_h = None
_img_w = None
_label_path = None
_model = None
_mouse_pos = None
def __init__(self, parent):
super().__init__(parent)
self._guide_pen = QPen(Qt.black, 1)
self.setDefaultClass(0)
def _boxes(self):
return list(filter(lambda i: i.type() == BBOX, self.items()))
def saveLabels(self):
if self._label_path != None:
if len(self._boxes()) == 0:
print('Removing empty "{}"'.format(self._label_path))
try:
os.remove(self._label_path)
except OSError as ex:
if ex.errno != errno.ENOENT:
raise
else:
lf = QSaveFile(self._label_path)
if not lf.open(QIODevice.WriteOnly | QIODevice.Text):
raise IOError('Cannot open "{}" for writing'.format(self._label_path))
for bbox in self._boxes():
rect = bbox.rect()
c = bbox.number
x = (rect.x() + rect.width() / 2) / self._img_w
y = (rect.y() + rect.height() / 2) / self._img_h
w = rect.width() / self._img_w
h = rect.height() / self._img_h
line = '{c:d} {x:.10f} {y:.10f} {w:.10f} {h:.10f}\n'.format(c=c, x=x, y=y, w=w, h=h)
lf.write(line.encode())
if lf.commit():
print('Wrote "{}"'.format(self._label_path))
else:
raise IOError('Cannot write "{}"'.format(self._label_path))
def _addBBox(self, p1, p2, cls):
rect = _mkRectF(p1, p2).intersected(QRectF(self._image.rect()))
square = abs(rect.width() * rect.height())
if square > 0.0:
zvalue = 1.0 / square
bbox = BoundingBoxItem(cls, rect, self._model)
bbox.setZValue(zvalue)
self.addItem(bbox)
return True
else:
return False
def _newBBox(self, p1, p2):
if self._addBBox(p1, p2, self._default_class):
self.invalidate()
self.saveLabels()
def setDefaultClass(self, cls):
self._default_class = cls
if self._model != None:
(hue, sat, val) = self._model.hsvF(self._default_class)
self._bbox_pen = QPen(QColor.fromHsvF(hue, sat, val), 2)
def mouseMoveEvent(self, event):
self._mouse_pos = event.scenePos()
self.invalidate()
super().mouseMoveEvent(event)
def mousePressEvent(self, event):
pos = event.scenePos()
self._bbox_start_pos = pos
def mouseReleaseEvent(self, event):
if self._bbox_start_pos != None:
self._newBBox(self._bbox_start_pos, event.scenePos())
self._bbox_start_pos = None
self._mouse_pos = None
def mouseDoubleClickEvent(self, event):
item = self.itemAt(event.scenePos(), QTransform())
if item != None and item.type() == BBOX:
self.removeItem(item)
self.invalidate()
self.saveLabels()
def drawForeground(self, painter, rect):
if self._mouse_pos != None:
if self._bbox_start_pos == None:
painter.setClipRect(rect)
painter.setPen(self._guide_pen)
painter.drawLine(self._mouse_pos.x(), rect.top(), self._mouse_pos.x(), rect.bottom())
painter.drawLine(rect.left(), self._mouse_pos.y(), rect.right(), self._mouse_pos.y())
else:
painter.setPen(self._bbox_pen)
painter.drawRect(_mkRectF(self._bbox_start_pos, self._mouse_pos))
def loadImage(self, image_path, label_path):
self.clear()
self._image = QPixmap(image_path)
self._label_path = label_path
self.setSceneRect(QRectF(self._image.rect()))
self.addPixmap(self._image)
lines = []
self._img_h = self._image.height()
self._img_w = self._image.width()
try:
with open(self._label_path) as lbl:
lines = lbl.readlines()
except OSError as ex:
if ex.errno != errno.ENOENT:
raise
for l in lines:
m = YOSO.BBOX_RE.match(l)
if m != None:
cls = int(m.group('cls'))
x = float(m.group('x'))
y = float(m.group('y'))
h = float(m.group('h'))
w = float(m.group('w'))
p1 = QPointF((x - w/2) * self._img_w, (y - h/2) * self._img_h)
p2 = QPointF((x + w/2) * self._img_w, (y + h/2) * self._img_h)
self._addBBox(p1, p2, cls)
self.invalidate()
@property
def model(self):
return self._model
def setModel(self, model):
self._model = model
self.setDefaultClass(0)
class Workspace(QGraphicsView):
_scene = None
def __init__(self):
super().__init__()
self._scene = Scene(self)
self.setScene(self._scene)
self.setMouseTracking(True)
self.setEnabled(False)
def _fit(self):
scene_rect = self._scene.sceneRect()
self.fitInView(scene_rect, Qt.KeepAspectRatio)
@pyqtSlot(QModelIndex, QModelIndex)
def setDefaultClass(self, curr, _):
self._scene.setDefaultClass(curr.data(Qt.UserRole))
def resizeEvent(self, _):
self._fit()
def loadImage(self, image_path, label_path):
self._scene.loadImage(image_path, label_path)
self._fit()
self.viewport().update()
self.setEnabled(True)
def setModel(self, model):
self._scene.setModel(model)
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