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#!/usr/bin/env python
from waxy import *
# Modified from:
# Recipe 189744: wxPython Graphics - Drawing rubberbands over a canvas
# http://code.activestate.com/recipes/189744/
class Sprite:
def __init__(self, fname):
self.bitmap = Image(fname+".png").ConvertToBitmap()
self.bitmap_rev = Image(fname+"rev.png").ConvertToBitmap()
self.background = None
self.pos=wx.Point(0,0)
self.reversed=False
def Draw(self, dc):
# copy background from dc to memory object
memdc = wx.MemoryDC()
memdc.Blit(0, 0, self.bitmap.GetWidth(), self.bitmap.GetHeight(), dc,
self.pos[0], self.pos[1], wx.COPY, 1)
self.background = memdc # keep around for later
bitmap = self.bitmap if not self.reversed else self.bitmap_rev
dc.DrawBitmap(bitmap, self.pos[0], self.pos[1], 1)
def HitTest(self, pt):
rect = self.GetRect()
return rect.InsideXY(pt.x, pt.y)
def Intersects(self, rect):
myrect = self.GetRect()
# adjust for negative
arect=[val for val in rect]
if arect[2]<0:
arect[0]+=arect[2]
arect[2]=-arect[2]
if arect[3]<0:
arect[1]+=arect[3]
arect[3]=-arect[3]
return myrect.Intersects(arect)
def GetRect(self):
return wx.Rect(self.pos[0], self.pos[1],
self.bitmap.GetWidth(), self.bitmap.GetHeight())
class MyCanvas(Canvas):
def Init(self):
self.SetBackgroundColour('WHITE')
self.SetScrollbars(20, 20, 100, 100)
self.sprite = Sprite('heretic2')
self.sprite.pos=wx.Point(50,50)
# mouse selection start point
self.m_stpoint=Point(0,0)
# mouse selection end point
self.m_endpoint=Point(0,0)
# mouse selection cache point
self.m_savepoint=Point(0,0)
# flags for left click/ selection
self._leftclicked=False
self._selected=False
def OnLeftDown(self,event):
# Left mouse button down, change cursor to
# something else to denote event capture
self.m_stpoint = event.GetPosition()
self.SetCursor('cross')
# invalidate current canvas
self.Refresh()
# cache current position
self.m_savepoint = self.m_stpoint
self.m_endpoint = self.m_savepoint
self._selected = False
self._leftclicked = True
def OnMotion(self,event):
if event.Dragging() and self._leftclicked:
# Draw new rectangle
self.m_endpoint = event.GetPosition()
self.m_savepoint = self.m_endpoint # cache current endpoint
self.Refresh()
def OnLeftUp(self,event):
# User released left button, change cursor back
self.SetCursor('arrow')
self._selected = True #selection is done
self._leftclicked = False # end of clicking
self.Refresh()
def OnDraw(self, dc):
dc.SetTextForeground('BLUE')
dc.SetPen(wx.MEDIUM_GREY_PEN)
for i in range(50):
dc.DrawLine(0, i*10, i*10, 0)
w = (self.m_endpoint.x - self.m_stpoint.x)
h = (self.m_endpoint.y - self.m_stpoint.y)
rect=self.m_stpoint.x, self.m_stpoint.y, w, h
if self.sprite.Intersects(rect):
self.sprite.reversed=True
else:
self.sprite.reversed=False
self.sprite.Draw(dc)
if not self._selected:
dc.SetLogicalFunction(wx.XOR)
wbrush = wx.Brush(wx.Colour(255,255,255), wx.TRANSPARENT)
wpen = wx.Pen(wx.Colour(200, 200, 200), 1, wx.SOLID)
dc.SetBrush(wbrush)
dc.SetPen(wpen)
# Set clipping region to rectangle corners
# dc.SetClippingRegion(self.m_stpoint.x, self.m_stpoint.y, w,h)
dc.DrawRectangle(*rect)
def GetCurrentSelection(self):
""" Return the current selected rectangle """
# if there is no selection, selection defaults to
# current viewport
left = Point(0,0)
right = Point(0,0)
# user dragged mouse to right
if self.m_endpoint.y > self.m_stpoint.y:
right = self.m_endpoint
left = self.m_stpoint
# user dragged mouse to left
elif self.m_endpoint.y < self.m_stpoint.y:
right = self.m_stpoint
left = self.m_endpoint
return (left.x, left.y, right.x, right.y)
def ClearCurrentSelection(self):
""" Clear the current selected rectangle """
box = self.GetCurrentSelection()
dc=wx.ClientDC(self)
w = box[2] - box[0]
h = box[3] - box[1]
dc.SetClippingRegion(box[0], box[1], w, h)
dc.SetLogicalFunction(wx.XOR)
# The brush is not really needed since we
# dont do any filling of the dc. It is set for
# sake of completion.
wbrush = wx.Brush(wx.Colour(255,255,255), wx.TRANSPARENT)
wpen = wx.Pen(wx.Colour(200, 200, 200), 1, wx.SOLID)
dc.SetBrush(wbrush)
dc.SetPen(wpen)
dc.DrawRectangle(box[0], box[1], w,h)
self._selected = false
# reset selection to canvas size
self.ResetSelection()
def ResetSelection(self):
""" Resets the mouse selection to entire canvas """
self.m_stpoint = Point(0,0)
sz=self._canvas.GetSize()
w,h=sz.GetWidth(), sz.GetHeight()
self.m_endpoint = wxPoint(w,h)
class MainFrame(VerticalFrame): # frame has a sizer built in
def Body(self):
self.CreateStatusBar()
self.SetStatusText("This is the statusbar")
menubar = MenuBar(self)
menu1 = Menu(self)
menu1.Append("E&xit", self.CloseWindow, "Exit demo",hotkey="Ctrl+Q")
menubar.Append(menu1, "&File")
self.canvas = MyCanvas(self)
self.canvas.SetSize((400,300))
self.AddComponent(self.canvas, expand=1, stretch=1)
self.Pack()
self.CenterOnScreen()
self.Show()
def CloseWindow(self,event):
self.Close()
if __name__=="__main__":
app = Application(MainFrame, title=__file__)
app.Run()
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