我有一个名为imageBrowser的班级，会在wxMDIChildFrame中显示图片。该类主要用于通过一组控件向用户显示图像以浏览图像集。现在，在本课程中，我重写了onPaint事件处理程序，以响应附加到此wxMDIChildFrame的控件。因此，imageBrowser上有两个复选框：一个用于网格覆盖，另一个用于缩放栏覆盖。选中后，DC会在图像或比例尺上绘制网格。这些方法工作正常。当我在单独的wxMDIChildFrame中勾选另一个复选框以在图像上绘制一些随机点时，会出现问题，网格和比例尺会在选中此复选框时立即消失。但是，如果我只调整imageBrowser，wxMDIChildFrame的大小，则会显示网格，比例尺和点。所以这是我的onPaint处理程序：
def OnPaint(self, event):
dc = wx.BufferedPaintDC(self.staticBitmap, self.staticBitmap.GetBitmap())
dc.Clear()
dc.DrawBitmap(self.wxBitmap, 0, 0)
self.drawScaleBar(dc)
self.drawGrid(dc)
self.drawDots(dc)
event.Skip()
def drawGrid(self, dc):
gridWid, gridHgt = self.staticBitmap.GetBitmap().GetSize()
numRows, numCols = self.gridSize, self.gridSize
if self.controlPanel.showGridBox.IsChecked():
dc.SetPen(wx.Pen(self.gridColor, self.gridThickness))
dc.SetTextForeground(self.gridColor)
cellWid = float( gridWid - 1) / numRows
cellHgt = float( gridHgt - 1) / numCols
for rowNum in xrange( numRows + 1) :
dc.DrawLine( 0, rowNum*cellHgt, gridWid, rowNum*cellHgt )
for colNum in xrange( numCols + 1 ) :
dc.DrawLine( colNum*cellWid, 0, colNum*cellWid, gridHgt )
def drawScaleBar(self, dc):
gridWid, gridHgt = self.wxBitmap.GetSize()
if self.controlPanel.showScaleBar.IsChecked():
dc.SetPen(wx.Pen(self.scaleColor, 2))
dc.SetTextForeground(self.scaleColor)
width = self.Tools.imageInfo.size.GetLabel().split()[1]
#Scales the bar to the image width. If the user selected scale is larger than
#the current image the scale is set to the maximum width of the image.
if width != 'None':
width = width.replace('m', '')
width = float(width)
lineSize = ((gridWid/width) * (self.scaleSize/100.0))
if lineSize > gridWid:
lineSize = (gridWid * 0.9) - 1
self.scaleSize = int(width * 100 - 10)
self.controlPanel.chooseScaleSize.SetValue(str(self.scaleSize))
self.drawScaleBar(dc)
elif self.scaleLoc == 'Top Left':
dc.DrawLine(10, gridHgt * 0.1, 10 + lineSize, gridHgt * 0.1)
dc.DrawLine(10, gridHgt * 0.1 + 10, 10, gridHgt * 0.1 - 10)
dc.DrawLine(10 + lineSize, gridHgt * 0.1 + 10, 10 + lineSize, gridHgt * 0.1 - 10)
dc.DrawText(str(self.scaleSize) + 'cm', (10 + 10 + lineSize)/2.0 - 15, gridHgt * 0.1 - 25)
elif self.scaleLoc == 'Top Right':
dc.DrawLine(gridWid - 10, gridHgt * 0.1, (gridWid - 10) - lineSize, gridHgt * 0.1)
dc.DrawLine(gridWid - 10, gridHgt * 0.1 + 10, gridWid - 10, gridHgt * 0.1 - 10)
dc.DrawLine((gridWid - 10) - lineSize, gridHgt * 0.1 + 10, (gridWid - 10) - lineSize, gridHgt * 0.1 - 10)
dc.DrawText(str(self.scaleSize) + 'cm', ((gridWid - 10 - lineSize)+(gridWid - 10))/2.0 - 20, gridHgt * 0.1 - 25)
elif self.scaleLoc == 'Bottom Left':
dc.DrawLine(10, gridHgt * 0.9, 10 + lineSize, gridHgt * 0.9)
dc.DrawLine(10, gridHgt * 0.9 + 10, 10, gridHgt * 0.9 - 10)
dc.DrawLine(10 + lineSize, gridHgt * 0.9 + 10, 10 + lineSize, gridHgt * 0.9 - 10)
dc.DrawText(str(self.scaleSize) + 'cm', (10 + 10 + lineSize)/2.0 - 15, gridHgt * 0.9 - 25)
elif self.scaleLoc == 'Bottom Right':
dc.DrawLine(gridWid - 10, gridHgt * 0.9, (gridWid - 10) - lineSize, gridHgt * 0.9)
dc.DrawLine(gridWid - 10, gridHgt * 0.9 + 10, gridWid - 10, gridHgt * 0.9 - 10)
dc.DrawLine((gridWid - 10) - lineSize, gridHgt * 0.9 + 10, (gridWid - 10) - lineSize, gridHgt * 0.9 - 10)
dc.DrawText(str(self.scaleSize) + 'cm', ((gridWid - 10 - lineSize)+(gridWid - 10))/2.0 - 20, gridHgt * 0.9 - 25)
else:
#If there is no depth or size information for the current image the scale
#bar is collapsed and '0cm' is displayed.
if self.scaleLoc == 'Top Left':
dc.DrawLine((15) + (gridWid/15), gridHgt * 0.1 + 10, (15) + (gridWid/15), gridHgt * 0.1 - 10)
dc.DrawText('0cm', (15) + (gridWid/15/2), gridHgt * 0.1 - 25)
elif self.scaleLoc == 'Top Right':
dc.DrawLine((gridWid * 0.9) - (gridWid/15), gridHgt * 0.1 + 10, (gridWid * 0.9) - (gridWid/15), gridHgt * 0.1 - 10)
dc.DrawText('0cm', (gridWid * 0.9) - (gridWid/15), gridHgt * 0.1 - 25)
elif self.scaleLoc == 'Bottom Left':
dc.DrawLine((15) + (gridWid/15), gridHgt * 0.9 + 10, (15) + (gridWid/15), gridHgt * 0.9 - 10)
dc.DrawText('0cm', (15) + (gridWid/15/2), gridHgt * 0.9 - 25)
elif self.scaleLoc == 'Bottom Right':
dc.DrawLine((gridWid * 0.9) - (gridWid/15), gridHgt * 0.9 + 10, (gridWid * 0.9) - (gridWid/15), gridHgt * 0.9 - 10)
dc.DrawText('0cm', (gridWid * 0.9) - (gridWid/15), gridHgt * 0.9 - 25)
def drawDots(self, dc):
if self.Tools.classificationTool.dotEnable.GetValue():
for dictionary in Workspace.assignmentHash:
if dictionary.keys()[0] == Workspace.data.getImageName(Workspace.currentImageIndex):
dc.SetPen(wx.Pen('Red', 1))
dc.SetBrush(wx.Brush('Red'))
print 'This image should have Dots!'
index = Workspace.assignmentHash.index(dictionary)
for dict in Workspace.assignmentHash[index].values()[0]:
s = dict.keys()[0]
r = re.search('(d\d+)(\(\d.\d+,\d.\d+\))', s)
num = r.group(1)[1:]
coord = r.group(2).split(',')
x = float(coord[0][1:])
x *= (Workspace.iWidth*Workspace.zoomScale)
x = int(x)
y = float(coord[1][:-1])
y *= (Workspace.iHeight*Workspace.zoomScale)
y = int(y)
dc.DrawCircle(x, y, 3)
同样，只要未启用drawDots（位于不同的wxMDIChildFrame）的复选框，此工作正常。请务必注意，此其他wxMDIChildFrame最初仅作为空白框加载。然后，用户打开一个“分类文件”，它会销毁该初始空白帧，从菜单栏中删除其初始菜单，然后根据“分类文件”使用小部件重新初始化它，然后将菜单添加回菜单栏中。选项。只有在打开“分类文件”后，复选框才会清除网格/比例尺。
我实施drawDots()方法的方式与我对drawGrid()和drawScaleBar()的实施方式相同。唯一的区别是drawDots()的复选框位于不同的类中。除了通过调用使用Refresh()的另一个方法调用强制重新绘制事件的父类之外，此复选框的事件处理程序几乎没有任何作用。这是drawScaleBar()和drawGrid()方法也可以这样做的方式。
如何解决此问题？