我是Python新手。我用固定坐标绘制了多边形和圆形。现在我想用鼠标移动这个多边形和圆圈到窗口上的其他位置。请指导我怎么做?
import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
class MyFrame(QWidget):
def __init__(self, parent=None):
QWidget.__init__(self)
def paintEvent(self, event=None):
paint=QPainter(self)
paint.setPen(QPen(QColor(Qt.green).dark(150),1,Qt.SolidLine))
segColor=QColor(Qt.green).dark(150)
paint.setBrush(segColor)
paint.setBrushOrigin(QPoint(225,225))
polygon=QPolygon([QPoint(250,175), QPoint(265,175), QPoint(250,190), QPoint(265,190),QPoint(250,175)])
paint.drawPolygon(polygon)
paint.setPen(QPen(QColor(Qt.red),1,Qt.SolidLine))
paint.setBrush(QBrush(Qt.NoBrush))
polygon1=QPolygon([QPoint(250,300), QPoint(250,500), QPoint(350,500), QPoint(350,300)])
paint.drawPolyline(polygon1)
paint.drawEllipse(50,50,50,50)
app=QApplication(sys.argv)
f=MyFrame()
f.show()
app.exec_()
答案 0 :(得分:8)
您应该查看QGraphicsView而不是您正在做的事情,它已经内置了所有内容。
http://doc.qt.nokia.com/4.7-snapshot/qgraphicsview.html
http://doc.qt.nokia.com/4.7-snapshot/qgraphicsscene.html
from PyQt4 import QtGui, QtCore
class MyFrame(QtGui.QGraphicsView):
def __init__( self, parent = None ):
super(MyFrame, self).__init__(parent)
self.setScene(QtGui.QGraphicsScene())
# add some items
x = 0
y = 0
w = 45
h = 45
pen = QtGui.QPen(QtGui.QColor(QtCore.Qt.green))
brush = QtGui.QBrush(pen.color().darker(150))
item = self.scene().addEllipse(x, y, w, h, pen, brush)
item.setFlag(QtGui.QGraphicsItem.ItemIsMovable)
if ( __name__ == '__main__' ):
app = QtGui.QApplication([])
f = MyFrame()
f.show()
app.exec_()
修改:显示如何创建QPainterPath
from PyQt4 import QtGui, QtCore
class MyFrame(QtGui.QGraphicsView):
def __init__( self, parent = None ):
super(MyFrame, self).__init__(parent)
scene = QtGui.QGraphicsScene()
self.setScene(scene)
# add some items
x = 0
y = 0
w = 45
h = 45
pen = QtGui.QPen(QtGui.QColor(QtCore.Qt.green))
brush = QtGui.QBrush(pen.color().darker(150))
item = scene.addEllipse(x, y, w, h, pen, brush)
item.setFlag(QtGui.QGraphicsItem.ItemIsMovable)
# create an open path
path = QtGui.QPainterPath()
path.moveTo(-w, -h)
path.lineTo(-w, h)
path.lineTo(w, h)
path.lineTo(w, -h)
clr = QtGui.QColor('blue')
clr.setAlpha(120)
brush = QtGui.QBrush(clr)
pen = QtGui.QPen(QtCore.Qt.NoPen)
fill_item = scene.addRect(-w, y, w*2, h, pen, brush)
path_item = scene.addPath(path)
if ( __name__ == '__main__' ):
app = QtGui.QApplication([])
f = MyFrame()
f.show()
app.exec_()
答案 1 :(得分:0)
from PyQt5.QtGui import QPen, QBrush, QColor
from PyQt5.QtCore import Qt, QTimer
from PyQt5.QtWidgets import QGraphicsView, QGraphicsScene, QGraphicsItem, QApplication
class GameWindow(QGraphicsView):
def __init__( self, parent = None ):
super().__init__(parent)
self.sx = 635
self.sy = 475
scene = QGraphicsScene(0,0,self.sx,self.sy)
self.setScene(scene)
self.x = 0
self.y = 0
self.w = 30
self.h = 30
pen = QPen(QColor('dodgerblue'))
#pen = QPen(QColor(Qt.green))
brush = QBrush(pen.color())
#brush = QBrush(pen.color().darker(150))
# As opposed to using QPen and QBrush, this colors the periphery only
#dot = scene.addEllipse(self.x, self.y, self.w, self.h, QColor('dodgerblue'))
self.dot = scene.addEllipse(self.x, self.y, self.w, self.h, pen, brush)
self.dot.setFlag(QGraphicsItem.ItemIsMovable)
if __name__ == '__main__':
import sys
fps = 50
refresh_period = 1000/fps # ms
app = QApplication(sys.argv)
gw = GameWindow()
gw.resize(640,480)
gw.show()
# if the steps match the gw aspect ratio, the dot will move along the main diagonal,
# otherwise the dot will drift
xstep = 4
ystep = 3
#ystep = xstep * gw.sy / gw.sx
def moveDot():
# In place of the next four lines, one can have a function
# or a feed from an external source to update gw.x and gw.y
gw.x += xstep
gw.x %= gw.sx
gw.y += ystep
gw.y %= gw.sy
gw.dot.setRect(gw.x,gw.y,gw.w,gw.h)
timer = QTimer()
timer.timeout.connect(moveDot)
# Comment this line out to be able to click and drag the dot
timer.start(refresh_period)
sys.exit(app.exec_())