#
#   Python GUI - Drawing - Generic
#

from StdColors import black, white
from StdFonts import application_font
from Properties import Properties, overridable_property

class Canvas(Properties):

    _default_forecolor = black
    _default_backcolor = white

    pencolor = overridable_property('pencolor', "Current color for stroking paths.")
    fillcolor = overridable_property('fillcolor', "Current color for filling paths.")
    textcolor = overridable_property('textcolor', "Current color for drawint text.")
    forecolor = overridable_property('forecolor', "Sets pen, fill and text colors to the same color.")
    backcolor = overridable_property('backcolor', "Current color for erasing regions.")
    pensize = overridable_property('pensize', "Width of pen for framing and stroking.")
    font = overridable_property('font', "Font for drawing text.")
    current_point = overridable_property('current_point', "The current point, or None.")

    #forecolor = overridable_property('forecolor', "Sets both pencolor and fillcolor.")

    def __init__(self):
        self.newpath()

    def initgraphics(self):
        self.set_forecolor(self._default_forecolor)
        self.set_backcolor(self._default_backcolor)
        self.set_pensize(1)
        self.set_font(application_font)
    
    def set_forecolor(self, c):
        self.pencolor = c
        self.fillcolor = c
        self.textcolor = c
    
    def rmoveto(self, dx, dy):
        x0, y0 = self._current_point()
        self.moveto(x0 + dx, y0 + dy)
    
    def rlineto(self, dx, dy):
        x0, y0 = self.current_point
        self.lineto(x0 + dx, y0 + dy)
    
    def curve(self, sp, cp1, cp2, ep):
        self.moveto(sp)
        self.curveto(cp1, cp2, ep)
    
    def rcurveto(self, cp1, cp2, ep):
        x0, y0 = self.current_point
        x1, y1 = cp1
        x2, y2 = cp2
        x3, y3 = ep
        self.curveto(
            (x0 + x1, y0 + y1),
            (x0 + x2, y0 + y2),
            (x0 + x3, y0 + y3))
    
    def fill_stroke(self):
        self.fill()
        self.stroke()
    
    #  Rectangles
    
    def _pen_inset_rect(self, rect):
        l, t, r, b = rect
        p = 0.5 * self.pensize
        return (l + p, t + p, r - p, b - p)

    def rect(self, rect):
        l, t, r, b = rect
        self.moveto(l, t)
        self.lineto(r, t)
        self.lineto(r, b)
        self.lineto(l, b)
        self.closepath()
    
    def rect_frame(self, rect):
        self.rect(self._pen_inset_rect(rect))
    
    def fill_rect(self, rect):
        self.newpath()
        self.rect(rect)
        self.fill()
    
    def stroke_rect(self, rect):
        self.newpath()
        self.rect(rect)
        self.stroke()
    
    def frame_rect(self, rect):
        self.newpath()
        self.rect_frame(rect)
        self.stroke()

    def fill_stroke_rect(self, rect):
        self.rect_path(rect)
        self.fill_stroke()
    
    def fill_frame_rect(self, rect):
        self.fill_rect(rect)
        self.frame_rect(rect)
    
    def erase_rect(self, rect):
        self.newpath()
        self.rect(rect)
        self.erase()
    
    #  Ovals
    
    def oval_frame(self, rect):
        self.oval(self._pen_inset_rect(rect))
    
    def fill_oval(self, rect):
        self.newpath()
        self.oval_frame(rect)
        self.fill()
    
    def stroke_oval(self, rect):
        self.newpath()
        self.oval(rect)
        self.stroke()
    
    def frame_oval(self, rect):
        self.newpath()
        self.oval_frame(rect)
        self.stroke()

    def fill_stroke_oval(self, rect):
        self.newpath()
        self.oval(rect)
        self.fill_stroke()

    def fill_frame_oval(self, rect):
        self.fill_oval(rect)
        self.frame_oval()

    def erase_oval(self, rect):
        self.newpath()
        self.oval(rect)
        self.erase()
    
    #  Arcs
    
    def _arc_path(self, c, r, a0, a1):
#		x, y = c
#		a0r = a0 * deg
#		x0 = x + r * cos(a0r)
#		y0 = y + r * sin(a0r)
        self.newpath()
#		self.moveto(x0, y0)
        self.arc(c, r, a0, a1)
    
    def _arc_frame_path(self, c, r, a0, a1):
        self._arc_path(c, r - 0.5 * self.pensize, a0, a1)
    
    def stroke_arc(self, c, r, a0, a1):
        self._arc_path(c, r, a0, a1)
        self.stroke()
    
    def frame_arc(self, c, r, a0, a1):
        self._arc_frame_path(c, r, a0, a1)
        self.stroke()
    
        #  Wedges
    
    def wedge(self, c, r, a0, a1):
        self.moveto(*c)
        self.arc(c, r, a0, a1)
        self.closepath()
    
    def fill_wedge(self, c, r, a0, a1):
        self.newpath()
        self.wedge(c, r, a0, a1)
        self.fill()
    
    def stroke_wedge(self, c, r, a0, a1):
        self.newpath()
        self.wedge(c, r, a0, a1)
        self.stroke()
    
    def fill_stroke_wedge(self, c, r, a0, a1):
        self.newpath()
        self.wedge(c, r, a0, a1)
        self.fill_stroke()
    
    def erase_wedge(self, c, r, a0, a1):
        self.newpath()
        self.wedge(c, r, a0, a1)
        self.erase()
    
    #  Polylines
    
    def lines(self, points):
        point_iter = iter(points)
        self.moveto(*point_iter.next())
        for p in point_iter:
            self.lineto(*p)
    
    def linesto(self, points):
        for p in points:
            self.lineto(*p)
    
    def stroke_lines(self, points):
        self.newpath()
        self.lines(points)
        self.stroke()
    
    #  Polycurves
    
    def curves(self, points):
        self.moveto(*points[0])
        for i in xrange(1, len(points), 3):
            self.curveto(*points[i:i+3])
    
    def curvesto(self, points):
        for i in xrange(0, len(points), 3):
            self.curveto(*points[i:i+3])
                
    def stroke_curves(self, points):
        self.newpath()
        self.curves(points)
        self.stroke()
                
    #  Polygons

    def poly(self, points):
        self.lines(points)
        self.closepath()
        
    def fill_poly(self, points):
        self.newpath()
        self.poly(points)
        self.fill()
    
    def stroke_poly(self, points):
        self.newpath()
        self.poly(points)
        self.stroke()
    
    def fill_stroke_poly(self, points):
        self.newpath()
        self.poly(points)
        self.fill_stroke()

    def erase_poly(self, points):
        self.newpath()
        self.poly(points)
        self.erase()

    #  Loops
    
    def loop(self, points):
        self.curves(points)
        self.closepath()
    
    def fill_loop(self, points):
        self.newpath()
        self.loop(points)
        self.fill()
    
    def stroke_loop(self, points):
        self.newpath()
        self.loop(points)
        self.stroke()
    
    def fill_stroke_loop(self, points):
        self.newpath()
        self.loop(points)
        self.fill_stroke()

    def erase_loop(self, points):
        self.newpath()
        self.loop(points)
        self.erase()