Source code for enable.savage.svg.backends.wx

# (C) Copyright 2005-2022 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!

from enable.savage.svg import svg_extras


def elliptical_arc_to(self, rx, ry, phi, large_arc_flag, sweep_flag, x2, y2):
    import wx

    x1, y1 = self.GetCurrentPoint()
    arcs = svg_extras.elliptical_arc_to(
        self, rx, ry, phi, large_arc_flag, sweep_flag, x1, y1, x2, y2
    )
    for arc in arcs:
        path = wx.GraphicsRenderer_GetDefaultRenderer().CreatePath()
        path.MoveToPoint(x1, y1)
        path.AddCurveToPoint(*arc)

        self.AddPath(path)
        x1, y1 = self.GetCurrentPoint()
        self.MoveToPoint(x1, y1)
        self.CloseSubpath()


def AddEllipticalArc(self, x, y, width, height, theta, dtheta,
                     clockwise=False):
    """ Draws an arc of an ellipse within bounding rect (x,y,w,h) from
    startArc to endArc (in degrees, relative to the horizontal line of
    the eclipse)

    """
    import wx

    # compute the cubic bezier and add that to the path by calling
    # AddCurveToPoint
    sub_paths = svg_extras.bezier_arc(
        x, y, x + width, y + height, theta, dtheta
    )
    for sub_path in sub_paths:
        x1, y1, cx1, cy1, cx2, cy2, x2, y2 = sub_path

        path = wx.GraphicsRenderer_GetDefaultRenderer().CreatePath()
        path.MoveToPoint(x1, y1)
        path.AddCurveToPoint(cx1, cy1, cx2, cy2, x2, y2)

        self.AddPath(path)
        self.MoveToPoint(path.GetCurrentPoint())
        self.CloseSubpath()


try:
    import wx
except ImportError:
    pass
else:
    if not hasattr(wx.GraphicsPath, "AddEllipticalArcTo"):

        wx.GraphicsPath.AddEllipticalArcTo = AddEllipticalArc
        wx.GraphicsPath.elliptical_arc_to = elliptical_arc_to

    del AddEllipticalArc
    del wx