Source Code for Module arcmap.resizewidget

  1  ################################################################################ 
  2  # Authors: Brian Schott (Sir Alaran) 
  3  # Copyright: Brian Schott (Sir Alaran) 
  4  # Date: Sep 29 2009 
  5  # License: 
  6  # 
  7  # This program is free software: you can redistribute it and/or modify 
  8  # it under the terms of the GNU General Public License as published by 
  9  # the Free Software Foundation, either version 3 of the License, or 
 10  # (at your option) any later version. 
 11  # 
 12  # This program is distributed in the hope that it will be useful, 
 13  # but WITHOUT ANY WARRANTY; without even the implied warranty of 
 14  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
 15  # GNU General Public License for more details. 
 16  # 
 17  # You should have received a copy of the GNU General Public License 
 18  # along with this program.  If not, see <http://www.gnu.org/licenses/>. 
 19  ################################################################################ 
 20   
 21   
 22  """ 
 23  Contains a custom widget for previewing a resize operation 
 24  """ 
 25   
 26  import cairo 
 27  import gtk 
 28   
 29  import graphics 
 30   
 31   
 32 -class ResizeView(gtk.DrawingArea): 
 33          """ 
 34          Widget for previewing a resize operation. 
 35          """ 
 36   
 37          __gsignals__ = {"expose-event" : "override"} 
 38   
 39 -        def __init__(self, tileWidth, tileHeight , thumb): 
 40                  """ 
 41                  @type tileWidth: int 
 42                  @param tileWidth: current width of map in tiles 
 43                  @type tileHeight: int 
 44                  @param tileHeight: current height of map in tiles 
 45                  @type thumb: cairo.ImageSurface 
 46                  @param thumb: thumbnail image of the map 
 47                  """ 
 48                  gtk.DrawingArea.__init__(self) 
 49                  self.__tWidth = thumb.get_width() 
 50                  self.__tHeight = thumb.get_height() 
 51                  self.__pixelSize = int(max(thumb.get_width(), thumb.get_height())) 
 52                  self.__oldWidth = tileWidth 
 53                  self.__oldHeight = tileHeight 
 54                  self.__thumb = thumb 
 55                  self.__newWidth = tileWidth 
 56                  self.__newHeight = tileHeight 
 57                  self.__scaleFactor = 1.0 
 58                  self.__top = 0 
 59                  self.__bottom = 0 
 60                  self.__left = 0 
 61                  self.__right = 0 
 62                  self.__checkerBoard = graphics.getCheckerPattern(16) 
 63                  self.set_size_request(thumb.get_width(), thumb.get_height()) 
 64   
 65 -        def setTop(self, top): 
 66                  self.__top = top 
 67                  self.__newHeight = self.__oldHeight + self.__top + self.__bottom 
 68                  self.__setDimentions() 
 69   
 70 -        def setBottom(self, bottom): 
 71                  self.__bottom = bottom 
 72                  self.__newHeight = self.__oldHeight + self.__top + self.__bottom 
 73                  self.__setDimentions() 
 74   
 75 -        def setLeft(self, left): 
 76                  self.__left = left 
 77                  self.__newWidth = self.__oldWidth + self.__left + self.__right 
 78                  self.__setDimentions() 
 79   
 80 -        def setRight(self, right): 
 81                  self.__right = right 
 82                  self.__newWidth = self.__oldWidth + self.__left + self.__right 
 83                  self.__setDimentions() 
 84   
 85 -        def do_expose_event(self, event): 
 86                  """ 
 87                  Redraws the widget 
 88                  """ 
 89                  context = self.window.cairo_create() 
 90                  context.set_source(self.__checkerBoard) 
 91                  context.paint() 
 92                  context.scale(self.__scaleFactor, self.__scaleFactor) 
 93                  tileWidth = float(self.__tHeight) / float(self.__oldHeight) 
 94                  context.set_source_surface(self.__thumb, self.__left * tileWidth, 
 95                          self.__top * tileWidth) 
 96                  context.rectangle(self.__left * tileWidth, 
 97                          self.__top * tileWidth, self.__tWidth, self.__tHeight) 
 98                  context.fill() 
 99   
100 -        def __setDimentions(self): 
101                  # Sets the dimentions of the widget and causes a redraw with the proper 
102                  # scaling applied. The math here is magical. Don't mess with it 
103                  w = self.__pixelSize 
104                  h = self.__pixelSize 
105                  # gd = greater dimention 
106                  gd = max(self.__oldWidth, self.__oldHeight) 
107                  if self.__newWidth > self.__newHeight: 
108                          h = self.__pixelSize * (float(self.__newHeight) / float(self.__newWidth)) 
109                          self.__scaleFactor = gd / float(self.__newWidth) 
110                  else: 
111                          w = self.__pixelSize * (float(self.__newWidth) / float(self.__newHeight)) 
112                          self.__scaleFactor = gd / float(self.__newHeight) 
113                  self.set_size_request(int(w), int(h)) 
114                  self.queue_draw() 
115