[PythonReports-checkins] PythonReports/PythonReports wxDrivers.py, NONE, 1.1
Brought to you by:
a1s
Menu
▾
▴
[PythonReports-checkins] PythonReports/PythonReports wxDrivers.py, NONE, 1.1
|
From: alexander s. <a1...@us...> - 2006-11-01 17:44:36
|
Update of /cvsroot/pythonreports/PythonReports/PythonReports In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv22797 Added Files: wxDrivers.py Log Message: Rendering utilities for wxPython backend --- NEW FILE: wxDrivers.py --- """Rendering utilities for wxPython backend""" """History (most recent first): 01-nov-2006 [als] created """ __version__ = "$Revision: 1.1 $"[11:-2] __date__ = "$Date: 2006/11/01 17:44:32 $"[7:-2] __all__ = ["ImageDriver", "TextDriver"] from cStringIO import StringIO import os import wx from PythonReports import drivers class ImageDriver(drivers.ImageDriver): """Image processing driver Instances of this driver class are created for each distinct image source, i.e. image file or data block. Instantiation must be done by one of the factory methods .fromfile() and .fromdata(). """ backend = "wx" _image = None # wxImage object (not for external access) # we are not using wx.BITMAP_TYPE_ANY to verify that the type # passed to a factory method is accurate (unlike PIL, wx does # not report actual file format). TYPE_FLAGS = { "bmp": wx.BITMAP_TYPE_BMP, "gif": wx.BITMAP_TYPE_GIF, "jpg": wx.BITMAP_TYPE_JPEG, "jpeg": wx.BITMAP_TYPE_JPEG, "png": wx.BITMAP_TYPE_PNG, "pcx": wx.BITMAP_TYPE_PCX, "pnm": wx.BITMAP_TYPE_PNM, "tif": wx.BITMAP_TYPE_TIF, "tiff": wx.BITMAP_TYPE_TIF, "xpm": wx.BITMAP_TYPE_XPM, "ico": wx.BITMAP_TYPE_ICO, "cur": wx.BITMAP_TYPE_CUR, "ani": wx.BITMAP_TYPE_ANI, } @classmethod def _get_type_flag(cls, type): """Return wxImage construction flag for given image type""" try: return cls.TYPE_FLAGS[type] except KeyError: raise ValueError("Unsupported image type: %r" % type) @classmethod def fromfile(cls, filepath, type): """Create an image source from existing file Parameters: filepath: full path to the image file type: image type, e.g. "jpeg" or "png" Return value: new image wrapper object. """ _rv = cls() _rv.filepath = filepath _rv.type = type _rv._image = wx.Image(filepath, cls._get_type_flag(type)) return _rv @classmethod def fromdata(cls, data, type, name=None): """Create an image source from data block Parameters: data: image data type: image type, e.g. "jpeg" or "png" name: optional name of a report block containing data Return value: new image wrapper object. """ _rv = cls() _rv.name = name _rv.type = type #_rv._image = wx.ImageFromStream(wx.InputStream(StringIO(data)), # cls._get_type_flag(type)) _rv._image = wx.ImageFromStream(StringIO(data), cls._get_type_flag(type)) return _rv def getsize(self): """Return image size Return value: 2-element tuple (width, height). """ return (self._image.GetWidth(), self._image.GetHeight()) def _get_image_data(self, image, type=None): """Return image data as string Parameters: image: wx.Image object type: optional image type, e.g. "jpeg" or "gif". Default: preferred output type (jpeg or png). This is a helper method for all methods returning image data. """ if not type: type = self.preferred_type # XXX shoud use a MemoryFileSystem to avoid creating a temporary file. _filename = os.tempnam(None, "primg") image.SaveFile(_filename, self._get_type_flag(type)) _file = open(_filename, "rb") _rv = _file.read() _file.close() os.remove(_filename) return _rv def getdata(self, type=None): """Return image data as string Parameters: type: optional image type, e.g. "jpeg" or "gif". Default: preferred output type (jpeg or png). Return value: image data as string. """ return self._get_image_data(self._image, type) def scale(self, width, height, type=None): """Return a scaled image Parameters: width: target image width height: target image height type: optional image type, e.g. "jpeg" or "gif". Default: preferred output type (jpeg or png). Return value: image data as string. """ return self._get_image_data(self._image.Scale(width, height), type) def _cut(self, width, height, type): """Return an image cut to dimensions Parameters: width: target image width height: target image height type: image type, e.g. "jpeg" or "gif" Return value: image data as string. Each of target dimensions must be smaller or equal to current image size. If either width or height passed is greater than current one, the effect is undefined. """ _img = self._image.Size((width, height), (0, 0)) return self._get_image_data(_img, type) class TextDriver(drivers.TextDriver): """Text processing driver The driver is instantiated once for each report font and handles all texts printed out with that font. """ backend = "wx" # wxPython has no API for getting any font metrics... # 1/5 of character size is default line gap used by ReportLab. DEFAULT_LEADING = .2 def __init__(self, font): """Create text driver instance Parameters: font: report font definition (element instance) """ super(TextDriver, self).__init__(font) self.font = font self.height = font.get("size") self.leading = int(self.height * self.DEFAULT_LEADING) self._dc = wx.MemoryDC() self._dc.SetFont(self._get_font(font)) @staticmethod def _get_font(font): """Return wx.Font for given template/printout font element""" _attrs = { #"encoding": wx.FONTENCODING_UTF8, "family": wx.DECORATIVE, "faceName": font.get("typeface"), "pointSize": font.get("size"), "style": wx.NORMAL, "weight": wx.NORMAL, } # on windows, positive size is cell height # and negative size is character height if wx.Platform == "__WXMSW__": _attrs["pointSize"] = -_attrs["pointSize"] for (_prop, _attr, _value) in ( ("bold", "weight", wx.BOLD), ("italic", "style", wx.ITALIC), ("underline", "underline", True), ): if font.get(_prop, False): _attrs[_attr] = _value return wx.Font(**_attrs) def getsize(self, text): """Return size tuple (width, height) for given text""" return self._dc.GetTextExtent(text) # vim: set et sts=4 sw=4 : |
