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image_label_gui.py
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image_label_gui.py
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from PyQt5.QtCore import Qt, QSize, QPoint
from PyQt5.QtWidgets import QWidget,QPushButton,QLabel,QHBoxLayout,QGridLayout, QRadioButton, QButtonGroup
from PyQt5.QtGui import QPixmap, QImage, QPainter, QPen, QColor, QFont
from math import sqrt
class ImageDrawLabel(QLabel):
def __init__(self, size, imgUrl):
super(ImageDrawLabel, self).__init__()
self.size = size
print(size)
self.state = 0 # 0 for add, 1 for select
self.setFixedSize(size)
self._initUI()
self.imgUrl = imgUrl
self._initImg(imgUrl)
self.points=[]
self.selected_point = -1
self.setFocusPolicy(Qt.ClickFocus)
self.font = QFont("宋体",20, QFont.Black,True)
pass
def _initUI(self):
self.setAlignment(Qt.AlignCenter)
pass
def _initImg(self, url):
self.qimage = QImage(url)
self.qimage = self.qimage.scaled(self.size, Qt.IgnoreAspectRatio, Qt.SmoothTransformation)
self.qPixmap = QPixmap(self.qimage)
def _getDist(self,p1,p2):
return sqrt((p1.x()-p2.x())**2 + (p1.y()-p2.y())**2)
def _getNearestPoint(self, center):
dist_min = self._getDist(QPoint(0,0), QPoint(self.size.width(),self.size.height()))
index_min = -1
for i, p in enumerate(self.points):
dist = self._getDist(p, center)
if dist < dist_min:
dist_min = dist
index_min = i
else:
dist_min = dist_min
return index_min,dist_min
def keyPressEvent(self, e):
if e.key() == Qt.Key_D or e.key() == Qt.Key_Delete or e.key()==Qt.Key_Backspace and self.selected_point>0 and self.state:
if self.selected_point >= 0 and self.selected_point < len(self.points):
del self.points[self.selected_point]
print('delete:', str(self.selected_point))
self.selected_point = -1
else:
print('delete index out of range')
self.update()
def mousePressEvent(self, event):
self.prev_x = event.x()
self.prev_y = event.y()
if event.buttons() == Qt.LeftButton:
if not self.state:
print(event.pos())
self.points.append(event.pos())
self.selected_point = -1
else:
id, dist = self._getNearestPoint(event.pos())
self.selected_point = id
print('select:', str(id))
self.setMouseTracking(True)
def mouseMoveEvent(self, event):
offset_x = event.x() - self.prev_x
offset_y = event.y() - self.prev_y
self.points[self.selected_point] += QPoint(offset_x,offset_y)
x = self.points[self.selected_point].x()
y = self.points[self.selected_point].y()
x = x if 0<=x<self.size.width() else 0 if x < 0 else self.size.width()-1
y = y if 0<=y<self.size.height() else 0 if y < 0 else self.size.height()-1
self.points[self.selected_point] = QPoint(x,y)
print(self.points[self.selected_point])
self.prev_x = event.x()
self.prev_y = event.y()
self.update()
def mouseReleaseEvent(self, event):
self.setMouseTracking(False)
self.update()
def paintEvent(self, QPaintEvent):
painter = QPainter(self)
painter.drawPixmap(self.rect(), self.qPixmap)
pen = QPen()
pen.setCapStyle(Qt.RoundCap)
pen.setWidth(10)
pen.setBrush(QColor(255, 0, 0))
painter.setRenderHint(QPainter.Antialiasing, True)
painter.setFont(self.font)
for i,pos in enumerate(self.points):
if i == self.selected_point and self.state:
pen.setBrush(QColor(0, 255, 0))
else:
pen.setBrush(QColor(255, 0, 0))
painter.setPen(pen)
painter.drawPoint(pos)
pen.setBrush(QColor(218,112,214))
painter.setPen(pen)
painter.drawText(pos, str(i))
pass
def setState(self, state):
self.state = state
self.update()
class ImageLabelWidget(QWidget):
def __init__(self,ww,hh, lurl, rurl):
super(ImageLabelWidget, self).__init__()
self.w,self.h = ww,hh
self.lurl, self.rurl = lurl,rurl
self.image_ratio = 5
self.img_length = min(self.w // 2, int(self.h * self.image_ratio / (self.image_ratio + 1)))
self.img_size = QSize(self.img_length, self.img_length)
self._initUI()
self._connect()
pass
def _initUI(self):
layout = QGridLayout()
self.button = QPushButton("下一步")
self.button.setMinimumSize(200, 50)
self.check_button = QPushButton("检查")
self.check_button.setMinimumSize(200, 50)
self.button.setEnabled(False)
self.select = QRadioButton('选择')
self.add = QRadioButton('添加')
self.add.setChecked(True)
self.buttonGroup = QButtonGroup()
self.buttonGroup.addButton(self.add, 1)
self.buttonGroup.addButton(self.select, 2)
hbo = QHBoxLayout()
hbo.addStretch(2)
hbo.addWidget(self.add)
hbo.addWidget(self.select)
hbo.addStretch(1)
hbo.addWidget(self.check_button)
hbo.addWidget(self.button)
hbo.addStretch(1)
layout.addLayout(hbo, 0, 0, 1, 2)
layout.setRowStretch(0,1)
layout.setRowStretch(1, self.image_ratio)
self.leftim = ImageDrawLabel(self.img_size,self.lurl)
layout.addWidget(self.leftim, 1, 0)
self.rightim = ImageDrawLabel(self.img_size, self.rurl)
layout.addWidget(self.rightim, 1, 1)
self.setLayout(layout)
pass
def _connect(self):
self.buttonGroup.buttonClicked[int].connect(self.setState)
self.check_button.clicked.connect(self.check)
def setState(self, buttonid):
print(buttonid)
if buttonid == 1:
self.leftim.setState(0)
self.rightim.setState(0)
elif buttonid==2:
self.leftim.setState(1)
self.rightim.setState(1)
def check(self):
if len(self.leftim.points) != len(self.rightim.points):
self.button.setEnabled(False)
else:
self.button.setEnabled(True)