Wklej ten kod do edytora tekstu, spraw, aby był wykonywalny i uruchom go. Po wybraniu koloru kroplomierzem u góry pojawią się współrzędne xiy.
Edycja : Napisałem kod, aby dodać okno powiększenia. Aby pobrać piksele poza oknem, kliknij przycisk (nie kroplomierz). Kliknij przycisk ponownie, aby zatrzymać chwytanie wskaźnika. Nie wymyśliłem, jak narysować celownik za pomocą Cairo, ale prawdopodobnie możesz go używać w obecnej postaci. Zostawiłem tam kod Cairo na wypadek, gdyby ktoś mógł mi powiedzieć, dlaczego mój prostokąt nie rysuje…
#!/usr/bin/python
from gi.repository import Gtk,Gdk, GdkPixbuf
import cairo
class picker(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self)
self.connect('delete-event', Gtk.main_quit)
self.connect('motion-notify-event', self.motion_cb)
self.connect('button-press-event',self.button_press)
box=Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL)
#Setup area for coordinates and zoom window
coordbox=Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
self.xcoor=Gtk.Label("x: ")
coordbox.pack_start(self.xcoor, True, False, 1)
self.ycoor=Gtk.Label("y: ")
coordbox.pack_start(self.ycoor, True, False, 1)
self.zoomwin=Gtk.Image()
#Trying to draw on Gtk.Image with cairo for crosshairs... Not working
self.zoomwin.connect('draw', self.draw)
self.zoomwin.set_app_paintable(True)
coordbox.pack_start(self.zoomwin,True,True,1)
self.buttongo=Gtk.Button("Pick Color")
self.buttongo.connect('clicked',self.gobutton_activate)
coordbox.pack_start(self.buttongo,True,True,1)
box.pack_start(coordbox, True, False, 5)
#Put in color wheel for tweaking color
self.cp=Gtk.ColorSelection()
self.cp.connect('color-changed', self.on_color_changed)
box.pack_start(self.cp, True, True, 5)
self.add(box)
self.show_all()
#Set some initial parameters
self.w,self.h=10,10 #Size of zoomed image in pixels
self.count=0
self.window=self.get_window()
#set initial zoom image
self.zoomwin.set_from_pixbuf(self.get_image().scale_simple(240,240,GdkPixbuf.InterpType.TILES))
self.grabbing=False
def on_color_changed(self,widget=None, data=None):
#Print out x,y to widgets
display=Gdk.Display.get_default()
(screen,x,y,modifier)=display.get_pointer()
self.xcoor.set_text("x: %i" %x)
self.ycoor.set_text("y: %i" %y)
def get_image(self,w=None,h=None):
#Get a pixbuff image under pointer
if w==None: w=self.w
if h==None: h=self.h
display=Gdk.Display.get_default()
(screen,self.x,self.y,modifier)=display.get_pointer()
window=Gdk.get_default_root_window()
screenshot = Gdk.pixbuf_get_from_window(window,
self.x-int(w/2), self.y-int(h/2), int(w), int(h))
return screenshot
def motion_cb(self, widget, data):
#What to do while mouse pointer is moving
#DONT capture every event! Causes too much backup
if self.count==5:
self.pixbuf=self.get_image().scale_simple(240,240,GdkPixbuf.InterpType.TILES)
self.zoomwin.set_from_pixbuf(self.pixbuf)
self.zoomwin.queue_draw()
self.count=0
self.count+=1
def grab_start(self):
#Grab control of pointer outside of window
self.grabbing = True
Gdk.pointer_grab(self.window,
True, #allow passage of pointer events to children
Gdk.EventMask.POINTER_MOTION_MASK | Gdk.EventMask.BUTTON_PRESS_MASK | Gdk.EventMask.BUTTON_RELEASE_MASK,
None,
None,# could put a custom cursor here
0L)
def button_press(self,widget,data):
#capture color under the pointer and set the color selection
cenpx=self.get_image(1,1)
color=tuple(map(ord, cenpx.get_pixels()[:3]))
col=Gdk.RGBA(float(color[0])/256.,float(color[1])/256.,float(color[2])/256.)
self.cp.set_current_rgba(col)
def grab_stop(self):
#Stop Grabbing the pointer
Gdk.pointer_ungrab(0)
self.grabbing=False
def gobutton_activate(self, widget, data=None):
#Button control
if self.grabbing==False:
self.grab_start()
widget.set_label("Stop Picking")
else:
self.grab_stop()
widget.set_label("Pick Color")
def draw(self, widget, cr):
#this gets called, but nothing is drawn that I can see...
cr.set_operator(cairo.OPERATOR_SOURCE)
cr.set_source_rgba(1,1,1,1)
w = self.w
h = self.h
cr.set_source_rgba(1,1,1,1)
cr.set_line_width(10)
cr.rectangle(w/2-1,h/2-1,w/2+1,h/2+1)
cr.stroke()
cr.set_operator(cairo.OPERATOR_OVER)
if __name__=="__main__":
win=picker()
Gtk.main()
