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Diffstat (limited to 'grc/gui/Utils.py')
| -rw-r--r-- | grc/gui/Utils.py | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/grc/gui/Utils.py b/grc/gui/Utils.py new file mode 100644 index 000000000..bb19ed3d9 --- /dev/null +++ b/grc/gui/Utils.py @@ -0,0 +1,90 @@ +""" +Copyright 2008-2011 Free Software Foundation, Inc. +This file is part of GNU Radio + +GNU Radio Companion is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License +as published by the Free Software Foundation; either version 2 +of the License, or (at your option) any later version. + +GNU Radio Companion is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA +""" + +from Constants import POSSIBLE_ROTATIONS +from Cheetah.Template import Template +import pygtk +pygtk.require('2.0') +import gtk +import gobject + +def rotate_pixmap(gc, src_pixmap, dst_pixmap, angle=gtk.gdk.PIXBUF_ROTATE_COUNTERCLOCKWISE): + """ + Load the destination pixmap with a rotated version of the source pixmap. + The source pixmap will be loaded into a pixbuf, rotated, and drawn to the destination pixmap. + The pixbuf is a client-side drawable, where a pixmap is a server-side drawable. + @param gc the graphics context + @param src_pixmap the source pixmap + @param dst_pixmap the destination pixmap + @param angle the angle to rotate by + """ + width, height = src_pixmap.get_size() + pixbuf = gtk.gdk.Pixbuf( + colorspace=gtk.gdk.COLORSPACE_RGB, + has_alpha=False, bits_per_sample=8, + width=width, height=height, + ) + pixbuf.get_from_drawable(src_pixmap, src_pixmap.get_colormap(), 0, 0, 0, 0, -1, -1) + pixbuf = pixbuf.rotate_simple(angle) + dst_pixmap.draw_pixbuf(gc, pixbuf, 0, 0, 0, 0) + +def get_rotated_coordinate(coor, rotation): + """ + Rotate the coordinate by the given rotation. + @param coor the coordinate x, y tuple + @param rotation the angle in degrees + @return the rotated coordinates + """ + #handles negative angles + rotation = (rotation + 360)%360 + if rotation not in POSSIBLE_ROTATIONS: + raise ValueError('unusable rotation angle "%s"'%str(rotation)) + #determine the number of degrees to rotate + cos_r, sin_r = { + 0: (1, 0), + 90: (0, 1), + 180: (-1, 0), + 270: (0, -1), + }[rotation] + x, y = coor + return (x*cos_r + y*sin_r, -x*sin_r + y*cos_r) + +def get_angle_from_coordinates((x1,y1), (x2,y2)): + """ + Given two points, calculate the vector direction from point1 to point2, directions are multiples of 90 degrees. + @param (x1,y1) the coordinate of point 1 + @param (x2,y2) the coordinate of point 2 + @return the direction in degrees + """ + if y1 == y2:#0 or 180 + if x2 > x1: return 0 + else: return 180 + else:#90 or 270 + if y2 > y1: return 270 + else: return 90 + +def parse_template(tmpl_str, **kwargs): + """ + Parse the template string with the given args. + Pass in the xml encode method for pango escape chars. + @param tmpl_str the template as a string + @return a string of the parsed template + """ + kwargs['encode'] = gobject.markup_escape_text + return str(Template(tmpl_str, kwargs)) |