# Source code for pymunk.pyglet_util

    # ----------------------------------------------------------------------------
    # pymunk
    # Copyright (c) 2007-2016 Victor Blomqvist
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    """This submodule contains helper functions to help with quick prototyping
    using pymunk together with pyglet.

    Intended to help with debugging and prototyping, not for actual production use
    in a full application. The methods contained in this module is opinionated
    about your coordinate system and not very optimized (they use batched
    drawing, but there is probably room for optimizations still).
    """

    __docformat__ = "reStructuredText"

    __all__ = ["DrawOptions"]

    import math

    import pyglet

    import pymunk
    from pymunk.vec2d import Vec2d

    class DrawOptions(pymunk.SpaceDebugDrawOptions):
        def __init__(self, **kwargs):
            """Draw a pymunk.Space.

            Typical usage::

            >>> import pymunk
            >>> import pymunk.pygame_util
            >>> s = pymunk.Space()
            >>> options = pymunk.pyglet_util.DrawOptions()
            >>> s.debug_draw(options)

            You can control the color of a Shape by setting shape.color to the color
            you want it drawn in.

            >>> c = pymunk.Circle(None, 10)
            >>> c.color = (255, 0, 0, 255) # will draw my_shape in red

            You can optionally pass in a batch to use for drawing. Just
            remember that you need to call draw yourself.

            >>> my_batch = pyglet.graphics.Batch()
            >>> s = pymunk.Space()
            >>> options = pymunk.pyglet_util.DrawOptions(batch=my_batch)
            >>> s.debug_draw(options)
            >>> my_batch.draw()

            See pyglet_util.demo.py for a full example

            :Param:
                    kwargs : You can optionally pass in a pyglet.graphics.Batch
                        If a batch is given all drawing will use this batch to draw
                        on. If no batch is given a a new batch will be used for the
                        drawing. Remember that if you pass in your own batch you
                        need to call draw on it yourself.

            """
            self.new_batch = False

            if "batch" not in kwargs:
                self.new_batch = True
            else:
                self.batch = kwargs["batch"]

            super(DrawOptions, self).__init__()

        def __enter__(self):
            if self.new_batch:
                self.batch = pyglet.graphics.Batch()
        def __exit__(self, type, value, traceback):
            if self.new_batch:
                self.batch.draw()

        def draw_circle(self, pos, angle, radius, outline_color, fill_color):
            circle_center = pos

            #http://slabode.exofire.net/circle_draw.shtml
            num_segments = int(4 * math.sqrt(radius))
            theta = 2 * math.pi / num_segments
            c = math.cos(theta)
            s = math.sin(theta)

            x = radius # we start at angle 0
            y = 0

            ps = []

            for i in range(num_segments):
                ps += [Vec2d(circle_center.x + x, circle_center.y + y)]
                t = x
                x = c * x - s * y
                y = s * t + c * y

            mode = pyglet.gl.GL_TRIANGLE_STRIP
            ps2 = [ps[0]]
            for i in range(1, int(len(ps)+1/2)):
                ps2.append(ps[i])
                ps2.append(ps[-i])
            ps = ps2
            vs = []
            for p in [ps[0]] + ps + [ps[-1]]:
                    vs += [p.x, p.y]

            c = circle_center + Vec2d(radius, 0).rotated(angle)
            cvs = [circle_center.x, circle_center.y, c.x, c.y]

            bg = pyglet.graphics.OrderedGroup(0)
            fg = pyglet.graphics.OrderedGroup(1)

            l = len(vs)//2

            self.batch.add(len(vs)//2, mode, bg,
                    ('v2f', vs),
                    ('c4B', fill_color.as_int()*l))
            self.batch.add(2, pyglet.gl.GL_LINES, fg,
                    ('v2f', cvs),
                    ('c4B', outline_color.as_int()*2))

        def draw_segment(self, a, b, color):
            pv1 = a
            pv2 = b
            line = (int(pv1.x), int(pv1.y), int(pv2.x), int(pv2.y))

            self.batch.add(2, pyglet.gl.GL_LINES, None,
                        ('v2i', line),
                        ('c4B', color.as_int() * 2))

        def draw_fat_segment(self, a, b, radius, outline_color, fill_color):
            pv1 = a
            pv2 = b
            d = pv2 - pv1
            a = -math.atan2(d.x, d.y)
            radius = max(radius, 1)
            dx = radius * math.cos(a)
            dy = radius * math.sin(a)

            p1 = pv1 + Vec2d(dx,dy)
            p2 = pv1 - Vec2d(dx,dy)
            p3 = pv2 + Vec2d(dx,dy)
            p4 = pv2 - Vec2d(dx,dy)

            vs = [i for xy in [p1,p2,p3]+[p2,p3,p4] for i in xy]

            l = len(vs)//2
            self.batch.add(l,pyglet.gl.GL_TRIANGLES, None,
                        ('v2f', vs),
                        ('c4B', fill_color.as_int() * l))

        def draw_polygon(self, verts, radius, outline_color, fill_color):
            mode = pyglet.gl.GL_TRIANGLE_STRIP

            l = len(verts)
            mid = len(verts) // 2

            vs = []
            for i in range(mid):
                vs += [verts[i].x, verts[i].y]
                vs += [verts[l-1-i].x, verts[l-1-i].y]

            if l%2:
                vs += [verts[mid].x, verts[mid].y]

            vs = [vs[0], vs[1]] + vs + [vs[-2], vs[-1]]

            l = len(vs)//2
            self.batch.add(l, mode, None,
                        ('v2f', vs),
                        ('c4B', fill_color.as_int()*l))

        def draw_dot(self, size, pos, color):
            # todo: optimize this functions
            self.batch.add(1, pyglet.gl.GL_POINTS, grPointSize(size),
                        ('v2f', pos),
                        ('c4B', color.as_int()*1))

    class grPointSize(pyglet.graphics.Group):
        """
        This pyglet rendering group sets a specific point size.
        """
        def __init__(self, size=1.0):
            super(grPointSize, self).__init__()
            self.size = size
        def set_state(self):
            pyglet.gl.glPointSize(self.size)
        def unset_state(self):
            pyglet.gl.glPointSize(1.0)