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# Copyright (C) 2004-2005 Paul Cochrane |
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# |
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# This program is free software; you can redistribute it and/or |
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# modify it under the terms of the GNU General Public License |
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# as published by the Free Software Foundation; either version 2 |
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# of the License, or (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program; if not, write to the Free Software |
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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|
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# $Id: scene.py,v 1.23 2005/11/03 05:55:59 paultcochrane Exp $ |
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|
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## @file scene.py |
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|
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""" |
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Class and functions associated with a pyvisi Scene |
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""" |
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|
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# generic imports |
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from pyvisi.common import debugMsg, overrideWarning, fileCheck |
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|
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from pyvisi.renderer import Renderer |
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|
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__revision__ = '$Revision: 1.23 $' |
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|
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class Scene(object): |
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""" |
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The main object controlling the scene. |
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|
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This is the base Scene object. It should be inherited, and then its |
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methods overridden. |
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""" |
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|
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def __init__(self): |
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""" |
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The init function |
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""" |
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object.__init__(self) |
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debugMsg("Called Scene.__init__()") |
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|
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self.renderer = Renderer() |
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|
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self.xSize = 640 |
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self.ySize = 480 |
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|
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def add(self, obj): |
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""" |
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Add a new item to the scene |
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|
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@param obj: The object to add to the scene |
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@type obj: object |
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""" |
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debugMsg("Called Scene.add()") |
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|
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if obj is None: |
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raise ValueError, "You must specify an object to add" |
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|
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# print a warning message if get to here |
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overrideWarning("Scene.add") |
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|
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return |
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|
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def delete(self, obj): |
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""" |
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Delete an item from the scene |
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|
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@param obj: The object to remove |
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@type obj: object |
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""" |
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debugMsg("Called Scene.delete()") |
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|
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if obj is None: |
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raise ValueError, "You must specify an object to delete" |
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|
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# print a warning message if get to here |
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overrideWarning("Scene.delete") |
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|
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return |
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|
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def place(self, obj): |
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""" |
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Place an object within a scene |
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|
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@param obj: The object to place within the scene |
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@type obj: object |
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""" |
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debugMsg("Called Scene.place()") |
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|
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if obj is None: |
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raise ValueError, "You must specify an object to place" |
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|
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# print a warning message if get to here |
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overrideWarning("Scene.place") |
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|
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return |
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|
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def render(self, pause=False, interactive=False): |
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""" |
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Render (or re-render) the scene |
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|
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Render the scene, either to screen, or to a buffer waiting for a save |
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|
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@param pause: Flag to wait at end of script evaluation for user input |
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@type pause: boolean |
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|
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@param interactive: Whether or not to have interactive use of the output |
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@type interactive: boolean |
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""" |
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debugMsg("Called Scene.render()") |
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renderer = self.renderer |
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|
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# I don't yet know where to put this, but just to get stuff going... |
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renderer.runString("# Scene.render()\n") |
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|
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# optionally print out the evaluation stack to make sure we're doing |
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# the right thing |
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debugMsg("Here is the evaluation stack") |
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debugMsg(60*"#") |
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debugMsg(renderer.getEvalStack()) |
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debugMsg(60*"#") |
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|
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# execute the eval stack |
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evalStack = renderer.getEvalStack() |
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exec evalStack in self.renderer.renderDict |
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|
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# flush the evaluation stack |
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debugMsg("Flusing evaluation stack") |
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renderer.resetEvalStack() |
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|
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# this is just to stop lint from complaining that pause and |
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# interactive aren't used |
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if pause is not True or pause is not False: |
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raise ValueError, "\'pause\' must be either True or False" |
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|
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if interactive is not True or pause is not False: |
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raise ValueError, "\'interactive\' must be either True or False" |
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|
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return |
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|
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def save(self, fname, format): |
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""" |
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Save the scene to a file |
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|
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@param fname: The name of the file to save the scene to |
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@type fname: string |
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|
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@param format: The format in which to save the scene |
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@type format: Image object or string |
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""" |
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debugMsg("Called Scene.save()") |
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|
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if fname is None or fname == "": |
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raise ValueError, "You must specify an output filename" |
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|
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if format is None or format == "": |
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raise ValueError, "You must specify an image format" |
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|
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# now check the type of arguments sent in |
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if __debug__: |
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assert isinstance(fname, str), "Incorrect data type; expected str" |
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assert isinstance(format, str), "Incorrect data type; expected str" |
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|
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# do a check to see if the file exists |
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fileCheck(fname) |
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|
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# print a warning message if get to here |
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overrideWarning("Scene.save") |
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|
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return |
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|
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write = save |
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|
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def setBackgroundColor(self, *color): |
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""" |
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Sets the background color of the Scene |
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@param color: The color to set the background to. Can be RGB or CMYK |
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@type color: tuple |
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""" |
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debugMsg("Called Scene.setBackgroundColor()") |
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|
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# print a warning message if get to here |
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overrideWarning("Scene.setBackgroundColor") |
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|
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# pity this code doesn't work.... |
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# need to check on the values given in the *color array. |
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# if they're greater than 1, scale so that the largest is 1 |
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#maxColor = None |
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#for i in range(len(color)): |
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#if color[i] > 1: |
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#maxColor = color[i] |
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#print maxColor |
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|
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## if a maximum colour is found, then scale the colours |
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#if maxColor is not None: |
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#for i in range(len(color)): |
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#color[i] = color[i]/maxColor |
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|
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# if color is of length 3, then we have rgb |
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# if length is 4 then cmyk |
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# if length is 1 then greyscale |
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# otherwise barf |
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if len(color) == 3: |
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# ok, using rgb |
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# probably should use a Color object or something |
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# this will do in the meantime |
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pass |
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else: |
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raise ValueError, "Sorry, only RGB color is supported at present" |
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|
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return |
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|
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def getBackgroundColor(self): |
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""" |
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Gets the current background color setting of the Scene |
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""" |
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debugMsg("Called Scene.getBackgroundColor()") |
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# print a warning message if get to here |
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overrideWarning("Scene.getBackgroundColor") |
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|
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return |
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|
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def setSize(self, xSize, ySize): |
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""" |
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Sets the size of the scene. |
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This size is effectively the renderer window size. |
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@param xSize: the size to set the x dimension |
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@type xSize: int |
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@param ySize: the size to set the y dimension |
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@type ySize: int |
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""" |
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debugMsg("Called Scene.setSize()") |
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# make sure that the arguments are the right kind of thing |
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if __debug__: |
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assert isinstance(xSize, int), "Incorrect data type; expected int" |
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assert isinstance(ySize, int), "Incorrect data type; expected int" |
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self.xSize = xSize |
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self.ySize = ySize |
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return |
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def getSize(self): |
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""" |
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Gets the current size of the scene |
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This size is effectively the renderer window size. Returns a tuple |
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of the x and y dimensions respectively, in pixel units(??). |
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""" |
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debugMsg("Called Scene.getSize()") |
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return (self.xSize, self.ySize) |
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|
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def rendererCommand(self, command): |
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""" |
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Allows the user to run a low-level renderer-specific command directly |
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@param command: The renderer command to run as a string |
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@type command: string |
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""" |
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debugMsg("Called Scene.rendererCommand()") |
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# check that we get a string as input |
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if __debug__: |
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assert isinstance(command, str), "Incorrect data type; expected str" |
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|
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evalString = "%s" % command |
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self.renderer.runString(evalString) |
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return |
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|
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# vim: expandtab shiftwidth=4: |
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