如何在PyQt
我想知道哪种最好的方法来绘制一条两端都带有端点的线，将来将其用于将线的末端移动到另一点？
我的想法是使用多个类，其中一个类负责点，另一类负责线，另一类负责拖动点。我能够得到要绘制的点，并能绘制到每个点的线，但是我无法使端点显示在那条线上。
这是正确的方法还是有更好的方法来完成我要实现的目标？谢谢您的宝贵时间和任何建议。
更新
我一直在尝试使用这些示例被标记为重复时给出的示例，但我认为最终目标并不相同。这些示例分别制作了线和节点。我一直在尝试使我的代码适应它们，但是我不确定如何将其更改为我想要的方式。这些示例虽然很棒，但它们并不是我要尝试做的。
我希望较小的正方形在线条的末端并在绘制线条时放置，而不是像示例中那样放在前面。在我的项目代码中，线连接的点将无法移动。
我想要的结果看起来像
代码
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
import sys
from math import sqrt,cos,acos,asin,degrees,pi,hypot
class LogObject(QObject):
hovered = pyqtSignal()
notHovered = pyqtSignal()
def create_square():
scale = 250
path = QPainterPath()
path.addRect(-0.076,-0.07,0.1520,0.1400)
tr = QTransform()
tr.scale(scale, scale)
path = tr.map(path)
return path
def create_circle():
scale = 250
path = QPainterPath()
path.addEllipse(QPointF(0,0), 0.0750, 0.0750) # Using QPointF will center it
tr = QTransform()
tr.scale(scale, scale)
path = tr.map(path)
return path
def drawPath(x1,y1,x2,y2):
scale = 250
path = QPainterPath()
path.moveTo(x1,y1)
path.lineTo(x2,y2)
return path
def create_drag_point_square():
scale = 250
path = QPainterPath()
path.addRect(-0.0532,-0.049,0.1064,0.098)
tr = QTransform()
tr.scale(scale, scale)
path = tr.map(path)
return path
class DragPoint(QGraphicsPathItem):
def __init__(self,x,y):
super(DragPoint,self).__init__()
self.x = x
self.y = y
self.name = ''
self.setFlag(QGraphicsItem.ItemIsSelectable,True)
self.setPath(create_drag_point_square())
self.setAcceptHoverEvents(True)
self.log = LogObject()
pen = QPen(Qt.white)
pen.setStyle(Qt.SolidLine)
pen.setWidthF(6)
self.setPen(pen)
self.isSelected = False
def itemChange(self, change, value):
if change == self.ItemSelectedChange:
color = QColor(Qt.green) if value else QColor(Qt.white)
pen = self.pen()
pen.setColor(color)
self.setPen(pen)
return QGraphicsItem.itemChange(self, change, value)
def hoverEnterEvent(self, event):
color = QColor("red")
pen = self.pen()
pen.setColor(color)
self.setPen(pen)
self.log.hovered.emit()
QGraphicsItem.hoverMoveEvent(self, event)
def hoverLeaveEvent(self, event):
color = QColor(Qt.green) if self.isSelected else QColor(Qt.white)
pen = self.pen()
pen.setColor(color)
self.setPen(pen)
self.log.notHovered.emit()
QGraphicsItem.hoverMoveEvent(self, event)
class PathLine(QGraphicsPathItem):
def __init__(self,x1,y1,x2,y2,selectable=True):
super(PathLine,self).__init__()
self.x1 = x1
self.y1 = y1
self.x2 = x2
self.y2 = y2
self.name = ''
self.setFlag(QGraphicsItem.ItemIsSelectable,selectable)
self.setPath(drawPath(x1,y1,x2,y2))
self.setAcceptHoverEvents(True)
self.log = LogObject()
pen = QPen(Qt.white)
pen.setStyle(Qt.SolidLine)
pen.setWidthF(3)
self.setPen(pen)
self.isSelected = False
self.objectNameStart =''
self.objectNameEnd = ''
self.dpStart = DragPoint(x1,y1)
self.dpEnd = DragPoint(x2,y2)
def updateEndCords(self,x,y):
self.x2 = x
self.y2 = y
self.setPath(drawPath(self.x1,self.y1,x,y))
self.update()
def itemChange(self, change, value):
if change == self.ItemSelectedChange:
color = QColor(Qt.green) if value else QColor(Qt.white)
pen = self.pen()
pen.setColor(color)
self.setPen(pen)
return QGraphicsItem.itemChange(self, change, value)
def hoverEnterEvent(self, event):
color = QColor("red")
pen = self.pen()
pen.setColor(color)
self.setPen(pen)
self.log.hovered.emit()
QGraphicsItem.hoverMoveEvent(self, event)
def hoverLeaveEvent(self, event):
color = QColor(Qt.green) if self.isSelected else QColor(Qt.white)
pen = self.pen()
pen.setColor(color)
self.setPen(pen)
self.log.notHovered.emit()
QGraphicsItem.hoverMoveEvent(self, event)
class Point(QGraphicsPathItem):
def __init__(self, x, y, r, name):
super(Point, self).__init__()
self.setFlag(QGraphicsItem.ItemIsSelectable, True)
self.name = name
if self.name.split('__')[1] == '0':
self.setPath(create_circle())
else:
self.setPath(create_square())
self.setScale(1.5)
self.x = x
self.y = y
self.r = r
self.setRotation(180+self.r)
self.setAcceptHoverEvents(True)
self.log = LogObject()
self.setPos(x, y)
self.isSelected = False
pen = QPen(Qt.white)
pen.setStyle(Qt.SolidLine)
pen.setWidthF(3)
self.setPen(pen)
def itemChange(self, change, value):
if change == self.ItemSelectedChange:
color = QColor(Qt.green) if value else QColor(Qt.white)
pen = self.pen()
pen.setColor(color)
self.setPen(pen)
return QGraphicsItem.itemChange(self, change, value)
def hoverEnterEvent(self, event):
color = QColor("red")
pen = self.pen()
pen.setColor(color)
self.setPen(pen)
self.log.hovered.emit()
QGraphicsItem.hoverMoveEvent(self, event)
def hoverLeaveEvent(self, event):
color = QColor(Qt.green) if self.isSelected else QColor(Qt.white)
pen = self.pen()
pen.setColor(color)
self.setPen(pen)
self.log.notHovered.emit()
QGraphicsItem.hoverMoveEvent(self, event)
def mouseDoubleClickEvent(self,event):
print(self.name)
class Viewer(QGraphicsView):
photoClicked = pyqtSignal(QPoint)
rectChanged = pyqtSignal(QRect)
def __init__(self, parent):
super(Viewer, self).__init__(parent)
self.setMouseTracking(True)
self.origin = QPoint()
self.setRenderHints(QPainter.Antialiasing)
self._zoom = 0
self._empty = True
self.setScene(QGraphicsScene(self))
self.setTransformationAnchor(QGraphicsView.AnchorUnderMouse)
self.setResizeAnchor(QGraphicsView.AnchorUnderMouse)
self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
self.setFrameShape(QFrame.NoFrame)
self.area = float()
self.setPoints()
self.viewport().setCursor(Qt.ArrowCursor)
QTimer.singleShot(0, self.reset_fit)
self.selectedItems = []
self.setBackgroundBrush(Qt.black)
def setItems(self):
self.data = {
"x": [
-2415594.9965,
-2414943.8686,
-2417160.6592,
],
"y": [
10453172.2426,
10454269.7008,
10454147.2672,
],
"rotation":[
0,
313.9962,
43.9962,
]
}
self.adjustedPoints = {}
for i, (x, y,r) in enumerate(zip(self.data["x"], self.data["y"],self.data["rotation"])):
p = Point(x, y,r, "Point__" + str(i))
p.log.hovered.connect(self.hoverChange)
p.log.notHovered.connect(self.notHoverChange)
self.scene().addItem(p)
self.adjustedPoints[i] = [x,y,"Point__" + str(i)]
self.currentLine = PathLine(self.data['x'][0],self.data['y'][0],self.data['x'][1],self.data['y'][1])
self.scene().addItem(self.currentLine)
def setPoints(self):
self.setItems()
def hoverChange(self):
self.viewport().setCursor(Qt.PointingHandCursor)
def notHoverChange(self):
self.viewport().setCursor(Qt.ArrowCursor)
def reset_fit(self):
r = self.scene().itemsBoundingRect()
self.resetTransform()
self.setSceneRect(r)
self.fitInView(r, Qt.KeepAspectRatio)
self._zoom = 0
self.scale(1, -1)
class Window(QWidget):
def __init__(self):
super(Window, self).__init__()
self.viewer = Viewer(self)
VBlayout = QVBoxLayout(self)
VBlayout.addWidget(self.viewer)
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
window = Window()
window.setGeometry(500, 300, 800, 600)
window.show()
sys.exit(app.exec_())
0 个答案:
没有答案
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