from wxPython.wx import * import images BUFFERED = 1 #--------------------------------------------------------------------------- class MyCanvas(wxScrolledWindow): def __init__(self, parent, id = -1, size = wxDefaultSize): wxScrolledWindow.__init__(self, parent, id, wxPoint(0, 0), size, wxSUNKEN_BORDER) self.lines = [] self.maxWidth = 1000 self.maxHeight = 1000 self.x = self.y = 0 self.curLine = [] self.drawing = False self.SetBackgroundColour("WHITE") self.SetCursor(wxStockCursor(wxCURSOR_PENCIL)) bmp = images.getTest2Bitmap() mask = wxMaskColour(bmp, wxBLUE) bmp.SetMask(mask) self.bmp = bmp 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 getHeight(self): return self.maxHeight def OnPaint(self, event): 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, printing=False): dc.BeginDrawing() dc.SetPen(wxPen('RED')) dc.DrawRectangle((5, 5), (50, 50)) dc.SetBrush(wxLIGHT_GREY_BRUSH) dc.SetPen(wxPen('BLUE', 4)) dc.DrawRectangle((15, 15), (50, 50)) dc.SetFont(wxFont(14, wxSWISS, wxNORMAL, wxNORMAL)) dc.SetTextForeground(wxColour(0xFF, 0x20, 0xFF)) te = dc.GetTextExtent("Hello World") dc.DrawText("Hello World", (60, 65)) 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.DrawLines(lst, -60) dc.SetPen(wxGREY_PEN) dc.DrawPolygon(lst, 75) dc.SetPen(wxGREEN_PEN) dc.DrawSpline(lst+[(100,100)]) dc.DrawBitmap(self.bmp, (200, 20), True) dc.SetTextForeground(wxColour(0, 0xFF, 0x80)) dc.DrawText("a bitmap", (200, 85)) ## dc.SetFont(wxFont(14, wxSWISS, wxNORMAL, wxNORMAL)) ## dc.SetTextForeground("BLACK") ## dc.DrawText("TEST this STRING", 10, 200) ## print dc.GetFullTextExtent("TEST this STRING") font = wxFont(20, wxSWISS, wxNORMAL, wxNORMAL) dc.SetFont(font) dc.SetTextForeground(wxBLACK) for a in range(0, 360, 45): dc.DrawRotatedText("Rotated text...", (300, 300), a) dc.SetPen(wxTRANSPARENT_PEN) dc.SetBrush(wxBLUE_BRUSH) dc.DrawRectangle((50,500), (50,50)) dc.DrawRectangle((100,500), (50,50)) dc.SetPen(wxPen('RED')) dc.DrawEllipticArc((200, 500), (50, 75), 0, 90) if not printing: # This has troubles when used on a print preview in wxGTK, # probably something to do with the pen styles and the scaling # it does... 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('MEDIUM FOREST GREEN', 4)) for line in self.lines: for coords in line: dc.DrawLine(*coords) def SetXY(self, event): self.x, self.y = self.ConvertEventCoords(event) def ConvertEventCoords(self, event): xView, yView = self.GetViewStart() xDelta, yDelta = self.GetScrollPixelsPerUnit() return (event.GetX() + (xView * xDelta), event.GetY() + (yView * yDelta)) def OnLeftButtonEvent(self, event): if event.LeftDown(): self.SetFocus() 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) dc.BeginDrawing() dc.SetPen(wxPen('MEDIUM FOREST GREEN', 4)) coords = ((self.x, self.y), self.ConvertEventCoords(event)) self.curLine.append(coords) dc.DrawLine( *coords) self.SetXY(event) dc.EndDrawing() 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) #--------------------------------------------------------------------------- def runTest(frame, nb, log): win = MyCanvas(nb) return win #--------------------------------------------------------------------------- overview = """\ """ if __name__ == '__main__': import sys,os import run run.main(['', os.path.basename(sys.argv[0])])