import images
+BUFFERED = 1
+
#---------------------------------------------------------------------------
class MyCanvas(wxScrolledWindow):
self.lines = []
self.maxWidth = 1000
self.maxHeight = 1000
+ self.x = self.y = 0
+ self.curLine = []
+ self.drawing = false
- self.SetBackgroundColour(wxNamedColor("WHITE"))
- EVT_LEFT_DOWN(self, self.OnLeftButtonEvent)
- EVT_LEFT_UP(self, self.OnLeftButtonEvent)
- EVT_MOTION(self, self.OnLeftButtonEvent)
-
- EVT_PAINT(self, self.OnPaint)
-
-
+ self.SetBackgroundColour("WHITE")
self.SetCursor(wxStockCursor(wxCURSOR_PENCIL))
bmp = images.getTest2Bitmap()
mask = wxMaskColour(bmp, wxBLUE)
self.SetScrollbars(20, 20, self.maxWidth/20, self.maxHeight/20)
+ if BUFFERED:
+ # Initialize the buffer bitmap. No real DC is needed at this point.
+ self.buffer = wxEmptyBitmap(self.maxWidth, self.maxHeight)
+ dc = wxBufferedDC(None, self.buffer)
+ dc.SetBackground(wxBrush(self.GetBackgroundColour()))
+ dc.Clear()
+ self.DoDrawing(dc)
+
+ EVT_LEFT_DOWN(self, self.OnLeftButtonEvent)
+ EVT_LEFT_UP(self, self.OnLeftButtonEvent)
+ EVT_MOTION(self, self.OnLeftButtonEvent)
+ EVT_PAINT(self, self.OnPaint)
+ ##EVT_MOUSEWHEEL(self, self.OnWheel)
+
+
def getWidth(self):
return self.maxWidth
def OnPaint(self, event):
- dc = wxPaintDC(self)
- self.PrepareDC(dc)
- self.DoDrawing(dc)
+ if BUFFERED:
+ # Create a buffered paint DC. It will create the real
+ # wxPaintDC and then blit the bitmap to it when dc is
+ # deleted. Since we don't need to draw anything else
+ # here that's all there is to it.
+ dc = wxBufferedPaintDC(self, self.buffer)
+ else:
+ dc = wxPaintDC(self)
+ self.PrepareDC(dc)
+ # since we're not buffering in this case, we have to
+ # paint the whole window, potentially very time consuming.
+ self.DoDrawing(dc)
def DoDrawing(self, dc):
dc.BeginDrawing()
- dc.SetPen(wxPen(wxNamedColour('RED')))
+ dc.SetPen(wxPen('RED'))
dc.DrawRectangle(5, 5, 50, 50)
dc.SetBrush(wxLIGHT_GREY_BRUSH)
- dc.SetPen(wxPen(wxNamedColour('BLUE'), 4))
+ dc.SetPen(wxPen('BLUE', 4))
dc.DrawRectangle(15, 15, 50, 50)
dc.SetFont(wxFont(14, wxSWISS, wxNORMAL, wxNORMAL))
te = dc.GetTextExtent("Hello World")
dc.DrawText("Hello World", 60, 65)
- dc.SetPen(wxPen(wxNamedColour('VIOLET'), 4))
+ dc.SetPen(wxPen('VIOLET', 4))
dc.DrawLine(5, 65+te[1], 60+te[0], 65+te[1])
lst = [(100,110), (150,110), (150,160), (100,160)]
dc.DrawRectangle(50,500,50,50)
dc.DrawRectangle(100,500,50,50)
- dc.SetPen(wxPen(wxNamedColour('RED')))
+ dc.SetPen(wxPen('RED'))
dc.DrawEllipticArc(200, 500, 50, 75, 0, 90)
+ y = 20
+ for style in [wxDOT, wxLONG_DASH, wxSHORT_DASH, wxDOT_DASH, wxUSER_DASH]:
+ pen = wxPen("DARK ORCHID", 1, style)
+ if style == wxUSER_DASH:
+ pen.SetCap(wxCAP_BUTT)
+ pen.SetDashes([1,2])
+ pen.SetColour("RED")
+ dc.SetPen(pen)
+ dc.DrawLine(300, y, 400, y)
+ y = y + 10
+
+ dc.SetBrush(wxTRANSPARENT_BRUSH)
+ dc.SetPen(wxPen(wxColour(0xFF, 0x20, 0xFF), 1, wxSOLID))
+ dc.DrawRectangle(450, 50, 100, 100)
+ old_pen = dc.GetPen()
+ new_pen = wxPen("BLACK", 5)
+ dc.SetPen(new_pen)
+ dc.DrawRectangle(470, 70, 60, 60)
+ dc.SetPen(old_pen)
+ dc.DrawRectangle(490, 90, 20, 20)
+
self.DrawSavedLines(dc)
dc.EndDrawing()
-
def DrawSavedLines(self, dc):
- dc.SetPen(wxPen(wxNamedColour('MEDIUM FOREST GREEN'), 4))
+ dc.SetPen(wxPen('MEDIUM FOREST GREEN', 4))
for line in self.lines:
for coords in line:
apply(dc.DrawLine, coords)
self.SetXY(event)
self.curLine = []
self.CaptureMouse()
+ self.drawing = true
+
+ elif event.Dragging() and self.drawing:
+ if BUFFERED:
+ # If doing buffered drawing, create the buffered DC, giving it
+ # it a real DC to blit to when done.
+ cdc = wxClientDC(self)
+ self.PrepareDC(cdc)
+ dc = wxBufferedDC(cdc, self.buffer)
+ else:
+ dc = wxClientDC(self)
+ self.PrepareDC(dc)
- elif event.Dragging():
- dc = wxClientDC(self)
- self.PrepareDC(dc)
dc.BeginDrawing()
- dc.SetPen(wxPen(wxNamedColour('MEDIUM FOREST GREEN'), 4))
+ dc.SetPen(wxPen('MEDIUM FOREST GREEN', 4))
coords = (self.x, self.y) + self.ConvertEventCoords(event)
self.curLine.append(coords)
apply(dc.DrawLine, coords)
self.SetXY(event)
dc.EndDrawing()
- elif event.LeftUp():
+
+ elif event.LeftUp() and self.drawing:
self.lines.append(self.curLine)
self.curLine = []
self.ReleaseMouse()
+ self.drawing = false
+
+
+## This is an example of what to do for the EVT_MOUSEWHEEL event,
+## but since wxScrolledWindow does this already it's not
+## necessary to do it ourselves.
+
+## wheelScroll = 0
+## def OnWheel(self, evt):
+## delta = evt.GetWheelDelta()
+## rot = evt.GetWheelRotation()
+## linesPer = evt.GetLinesPerAction()
+## print delta, rot, linesPer
+## ws = self.wheelScroll
+## ws = ws + rot
+## lines = ws / delta
+## ws = ws - lines * delta
+## self.wheelScroll = ws
+## if lines != 0:
+## lines = lines * linesPer
+## vsx, vsy = self.GetViewStart()
+## scrollTo = vsy - lines
+## self.Scroll(-1, scrollTo)
#---------------------------------------------------------------------------
+overview = """\
+"""
+if __name__ == '__main__':
+ import sys,os
+ import run
+ run.main(['', os.path.basename(sys.argv[0])])
-
-
-
-overview = """\
-"""
projects / wxWidgets.git / blobdiff