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import errno
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 )
from pprint import pprint
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 saveLabels(self):
if self._label_path != None:
lf = QSaveFile(self._label_path)
if not lf.open(QIODevice.WriteOnly | QIODevice.Text):
raise IOError('Cannot open "{}" for writing'.format(self._label_path))
for item in self.items():
if item.type() == BBOX:
rect = item.rect()
c = item.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, prev):
self._scene.setDefaultClass(curr.data(Qt.UserRole))
def resizeEvent(self, event):
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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