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#! /usr/bin/python
import pygtk
import gtk
import gtk.gdk
import gobject
import cairo
import math
class Eye(gtk.DrawingArea):
def __init__(self):
gtk.DrawingArea.__init__(self)
self.connect("expose_event",self.expose)
self.frame = 0
# instead of listening for mouse move events we poll to see if the mouse has moved
# this is so we can react to the mouse even when it isn't directly over this widget
gobject.timeout_add(100, self._timeout_cb)
self.mousePosition = self.get_mouse()
def _timeout_cb(self):
# only redraw if the mouse has moved
newPosition = self.get_mouse()
if newPosition != self.mousePosition:
self.queue_draw()
self.mousePosition = newPosition
return True
def get_mouse(self):
display = gtk.gdk.display_get_default()
screen, mouseX, mouseY, modifiers = display.get_pointer()
return mouseX, mouseY
def expose(self, widget, event):
self.frame += 1
bounds = self.get_allocation()
mouseX, mouseY = self.mousePosition
eyeSize = min(bounds.width, bounds.height)
outlineWidth = eyeSize/20.0
pupilSize = eyeSize/10.0
pupilX = max(min(mouseX - bounds.x, bounds.width), 0)
pupilY = max(min(mouseY - bounds.y, bounds.height), 0)
dX = pupilX - bounds.width/2.
dY = pupilY - bounds.height/2.
distance = math.sqrt(dX*dX + dY*dY)
limit = eyeSize/2 - outlineWidth*2 - pupilSize
if distance > limit:
pupilX = bounds.width/2 + dX*limit/distance
pupilY = bounds.height/2 + dY*limit/distance
self.context = widget.window.cairo_create()
#self.context.set_antialias(cairo.ANTIALIAS_NONE)
#set a clip region for the expose event. This reduces redrawing work (and time)
self.context.rectangle(event.area.x, event.area.y, event.area.width, event.area.height)
self.context.clip()
# background
self.context.set_source_rgb(.5,.5,.5)
self.context.rectangle(0,0,bounds.width,bounds.height)
self.context.fill()
# eye ball
self.context.arc(bounds.width/2,bounds.height/2, eyeSize/2-outlineWidth/2, 0,360)
self.context.set_source_rgb(1,1,1)
self.context.fill()
# outline
self.context.set_line_width(outlineWidth)
self.context.arc(bounds.width/2,bounds.height/2, eyeSize/2-outlineWidth/2, 0,360)
self.context.set_source_rgb(0,0,0)
self.context.stroke()
# pupil
self.context.arc(pupilX,pupilY,pupilSize,0,360)
self.context.set_source_rgb(0,0,0)
self.context.fill()
return True
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