--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/grease/renderer/vector.py	Tue Jul 12 10:16:48 2011 +0200
@@ -0,0 +1,166 @@
+#############################################################################
+#
+# Copyright (c) 2010 by Casey Duncan and contributors
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the MIT License
+# A copy of the license should accompany this distribution.
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+#
+#############################################################################
+
+__version__ = '$Id$'
+
+__all__ = ('Vector',)
+
+from grease.geometry import Vec2d
+import ctypes
+from math import sin, cos, radians
+import pyglet
+
+
+class Vector(object):
+	"""Renders shapes in a classic vector graphics style
+	
+	:param scale: Scaling factor applied to shape vertices when rendered.
+	
+	:param line_width: The line width provided to ``glLineWidth`` before rendering.
+		If not specified or None, ``glLineWidth`` is not called, and the line
+		width used is determined by the OpenGL state at the time of rendering.
+
+	:param anti_alias: If ``True``, OpenGL blending and line smoothing is enabled.
+		This allows for fractional line widths as well. If ``False``, the blending
+		and line smoothing modes are unchanged.
+
+	:param corner_fill: If true (the default), the shape corners will be filled
+		with round points when the ``line_width`` exceeds 2.0. This improves
+		the visual quality of the rendering at larger line widths at some
+		cost to performance. Has no effect if ``line_width`` is not specified.
+
+	:param position_component: Name of :class:`grease.component.Position` 
+		component to use. Shapes rendered are offset by the entity positions.
+
+	:param renderable_component: Name of :class:`grease.component.Renderable` 
+		component to use. This component specifies the entities to be 
+		rendered and their base color.
+
+	:param shape_component: Name of :class:`grease.component.Shape` 
+		component to use. Source of the shape vertices for each entity.
+
+	The entities rendered are taken from the intersection of he position,
+	renderable and shape components each time :meth:`draw` is called.
+	"""
+
+	CORNER_FILL_SCALE = 0.6
+	CORNER_FILL_THRESHOLD = 2.0
+
+	def __init__(self, scale=1.0, line_width=None, anti_alias=True, corner_fill=True,
+		position_component='position', 
+		renderable_component='renderable', 
+		shape_component='shape'):
+		self.scale = float(scale)
+		self.corner_fill = corner_fill
+		self.line_width = line_width
+		self.anti_alias = anti_alias
+		self._max_line_width = None
+		self.position_component = position_component
+		self.renderable_component = renderable_component
+		self.shape_component = shape_component
+	
+	def set_world(self, world):
+		self.world = world
+
+	def _generate_verts(self):
+		"""Generate vertex and index arrays for rendering"""
+		vert_count = sum(len(shape.verts) + 1
+			for shape, ignored, ignored in self.world.components.join(
+				self.shape_component, self.position_component, self.renderable_component))
+		v_array = (CVertColor * vert_count)()
+		if vert_count > 65536:
+			i_array = (ctypes.c_uint * 2 * vert_count)()
+			i_size = pyglet.gl.GL_UNSIGNED_INT
+		else:
+			i_array = (ctypes.c_ushort * (2 * vert_count))()
+			i_size = pyglet.gl.GL_UNSIGNED_SHORT
+		v_index = 0
+		i_index = 0
+		scale = self.scale
+		rot_vec = Vec2d(0, 0)
+		for shape, position, renderable in self.world.components.join(
+			self.shape_component, self.position_component, self.renderable_component):
+			shape_start = v_index
+			angle = radians(-position.angle)
+			rot_vec.x = cos(angle)
+			rot_vec.y = sin(angle)
+			r = int(renderable.color.r * 255)
+			g = int(renderable.color.g * 255)
+			b = int(renderable.color.b * 255)
+			a = int(renderable.color.a * 255)
+			for vert in shape.verts:
+				vert = vert.cpvrotate(rot_vec) * scale + position.position
+				v_array[v_index].vert.x = vert.x
+				v_array[v_index].vert.y = vert.y
+				v_array[v_index].color.r = r
+				v_array[v_index].color.g = g
+				v_array[v_index].color.b = b
+				v_array[v_index].color.a = a
+				if v_index > shape_start:
+					i_array[i_index] = v_index - 1
+					i_index += 1
+					i_array[i_index] = v_index
+					i_index += 1
+				v_index += 1
+			if shape.closed and v_index - shape_start > 2:
+				i_array[i_index] = v_index - 1
+				i_index += 1
+				i_array[i_index] = shape_start
+				i_index += 1
+		return v_array, i_size, i_array, i_index
+
+	def draw(self, gl=pyglet.gl):
+		vertices, index_size, indices, index_count = self._generate_verts()
+		if index_count:
+			if self.anti_alias:
+				gl.glEnable(gl.GL_LINE_SMOOTH)
+				gl.glHint(gl.GL_LINE_SMOOTH_HINT, gl.GL_NICEST)
+				gl.glEnable(gl.GL_BLEND)
+				gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA)
+			gl.glPushClientAttrib(gl.GL_CLIENT_VERTEX_ARRAY_BIT)
+			gl.glEnableClientState(gl.GL_VERTEX_ARRAY)
+			gl.glEnableClientState(gl.GL_COLOR_ARRAY)
+			gl.glVertexPointer(
+				2, gl.GL_FLOAT, ctypes.sizeof(CVertColor), ctypes.pointer(vertices))
+			gl.glColorPointer(
+				4, gl.GL_UNSIGNED_BYTE, ctypes.sizeof(CVertColor), 
+				ctypes.pointer(vertices[0].color))
+			if self.line_width is not None:
+				gl.glLineWidth(self.line_width)
+				if self._max_line_width is None:
+					range_out = (ctypes.c_float * 2)()
+					gl.glGetFloatv(gl.GL_ALIASED_LINE_WIDTH_RANGE, range_out)
+					self._max_line_width = float(range_out[1]) * self.CORNER_FILL_SCALE
+				if self.corner_fill and self.line_width > self.CORNER_FILL_THRESHOLD:
+					gl.glEnable(gl.GL_POINT_SMOOTH)
+					gl.glPointSize(
+						min(self.line_width * self.CORNER_FILL_SCALE, self._max_line_width))
+					gl.glDrawArrays(gl.GL_POINTS, 0, index_count)
+			gl.glDrawElements(gl.GL_LINES, index_count, index_size, ctypes.pointer(indices))
+			gl.glPopClientAttrib()
+
+
+class CVert(ctypes.Structure):
+	_fields_ = [("x", ctypes.c_float), ("y", ctypes.c_float)]
+
+class CColor(ctypes.Structure):
+	_fields_ = [
+		("r", ctypes.c_ubyte), 
+		("g", ctypes.c_ubyte), 
+		("b", ctypes.c_ubyte), 
+		("a", ctypes.c_ubyte),
+	]
+
+class CVertColor(ctypes.Structure):
+	_fields_ = [("vert", CVert), ("color", CColor)]
+