# Copyright (c) 2007-2008 by Lorenzo Gil Sanchez <lorenzo.gil.sanchez@gmail.com>
#
# This file is part of PyCha.
#
# PyCha is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# PyCha 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PyCha.  If not, see <http://www.gnu.org/licenses/>.

from pycha.chart import Chart
from pycha.color import hex2rgb, clamp
from pycha.line import Point, LineChart

class ScatterplotChart(LineChart):
      
    def _renderChart(self, cx):
        """Renders a scatterplot"""
	def drawSymbol(point, size=2):
	    ox = point.x * self.area.w + self.area.x
	    oy = point.y * self.area.h + self.area.y
	    cx.move_to(ox-size, oy  )
	    cx.line_to(ox+size, oy  )
	    cx.move_to(ox     , oy-size)
	    cx.line_to(ox     , oy+size)
		       
        def preparePath(storeName, size=2):
            cx.new_path()
            for point in self.points:
                if point.name == storeName:
                    drawSymbol(point, size)
            cx.close_path()
        
        cx.save()
	
        cx.set_line_width(self.options.stroke.width)
	# TODO: self.options.stroke.shadow
	for key in self._getDatasetsKeys():
	    cx.set_source_rgb(*self.options.colorScheme[key])
	    preparePath(key)
	    cx.stroke()
	    
        cx.restore()

    def _renderLines(self, cx):
	"""We don't need lines in the background"""
	pass