#!/usr/bin/env python
###  CSC15, Hofstra University  - Professor Chuck Liang

#### Most of the first part of the program is to be left alone: be sure
#### to save a copy before you change something.

import pygtk
import gtk

width = 800    # width and height of window in pixels
height = 650

window = gtk.Window(gtk.WINDOW_TOPLEVEL)
window.set_title("Simplified Drawing Example")
window.connect("destroy", lambda w: gtk.main_quit())
area = gtk.DrawingArea()
area.set_size_request(width,height)
window.resize(width,height)
window.add(area)

def area_expose_cb(area, event):
    global mydraw
    mydraw(area.window)

area.connect("expose-event", area_expose_cb)
window.show_all()
window.move(0,0)

## gc is called a "graphical context": main object used to draw with
gc = area.window.new_gc()
cmap = gc.get_colormap()


### Some convenient colors, others can be defined using RGB values as shown:

green = cmap.alloc_color(red=0,green=65535,blue=0)
blue = cmap.alloc_color(red=0,green=0,blue=65535)
red = cmap.alloc_color(red=65535,green=0,blue=0)
white = cmap.alloc_color("white")
black = cmap.alloc_color("black")
gray = cmap.alloc_color("gray")
yellow = cmap.alloc_color("yellow")
purple = cmap.alloc_color("purple")

gc.set_foreground(green)   
gc.set_background(blue)
gc.line_width = 1  # thickness of lines

# convenient function to draw a circle using built-in draw_arc function.
def drawcircle(brush,x,y,radius,fill):
    brush.draw_arc(gc,fill,x-radius,y-radius,2*radius,2*radius,0,360*64)


## For detailed documentation on drawing methods, see:
#  https://developer.gnome.org/pygtk/stable/class-gdkdrawable.html

    
###################### Your code starts here #########################

def mydraw(brush):
    gc.set_foreground(white) # clear background ...
    brush.draw_rectangle(gc,True,0,0,width,height) # with a solid rectangle
    gc.set_foreground(blue)  # sets drawing color

    brush.draw_line(gc,10,20,width-10,height-10)
    brush.draw_rectangle(gc,False,40,40,200,60)
    gc.set_foreground(red)
    # drawing a circle is a little different from drawing other shapes:
    drawcircle(brush,width/2,height/2,100,False)
    drawcircle(brush,width/2,height/2,50,True)
# end mydraw


# The following line must be the last line in the program:
gtk.main()