Drawing Area
#!/usr/bin/env python # # [SNIPPET_NAME: Drawing Area] # [SNIPPET_CATEGORIES: PyGTK] # [SNIPPET_DESCRIPTION: Create a drawing area] # [SNIPPET_DOCS: http://www.pygtk.org/pygtk2tutorial/sec-DrawingAreaWidgetAndDrawing.html, http://www.pygtk.org/docs/pygtk/class-gtkdrawingarea.html] # example drawingarea.py import pygtk pygtk.require('2.0') import gtk import operator import time import string class DrawingAreaExample: def __init__(self): window = gtk.Window(gtk.WINDOW_TOPLEVEL) window.set_title("Drawing Area Example") window.connect("destroy", lambda w: gtk.main_quit()) self.area = gtk.DrawingArea() self.area.set_size_request(500, 400) self.pangolayout = self.area.create_pango_layout("") self.sw = gtk.ScrolledWindow() self.sw.add_with_viewport(self.area) self.sw.set_size_request(410, 330) self.table = gtk.Table(2,2) self.hruler = gtk.HRuler() self.vruler = gtk.VRuler() self.hruler.set_range(0, 400, 0, 400) self.vruler.set_range(0, 300, 0, 300) self.table.attach(self.hruler, 1, 2, 0, 1, yoptions=0) self.table.attach(self.vruler, 0, 1, 1, 2, xoptions=0) self.table.attach(self.sw, 1, 2, 1, 2) window.add(self.table) self.area.set_events(gtk.gdk.POINTER_MOTION_MASK | gtk.gdk.POINTER_MOTION_HINT_MASK ) self.area.connect("expose-event", self.area_expose_cb) def motion_notify(ruler, event): return ruler.emit("motion_notify_event", event) self.area.connect_object("motion_notify_event", motion_notify, self.hruler) self.area.connect_object("motion_notify_event", motion_notify, self.vruler) self.hadj = self.sw.get_hadjustment() self.vadj = self.sw.get_vadjustment() def val_cb(adj, ruler, horiz): if horiz: span = self.sw.get_allocation()[3] else: span = self.sw.get_allocation()[2] l,u,p,m = ruler.get_range() v = adj.value ruler.set_range(v, v+span, p, m) while gtk.events_pending(): gtk.main_iteration() self.hadj.connect('value-changed', val_cb, self.hruler, True) self.vadj.connect('value-changed', val_cb, self.vruler, False) def size_allocate_cb(wid, allocation): x, y, w, h = allocation l,u,p,m = self.hruler.get_range() m = max(m, w) self.hruler.set_range(l, l+w, p, m) l,u,p,m = self.vruler.get_range() m = max(m, h) self.vruler.set_range(l, l+h, p, m) self.sw.connect('size-allocate', size_allocate_cb) self.area.show() self.hruler.show() self.vruler.show() self.sw.show() self.table.show() window.show() def area_expose_cb(self, area, event): self.style = self.area.get_style() self.gc = self.style.fg_gc[gtk.STATE_NORMAL] self.draw_point(10,10) self.draw_points(110, 10) self.draw_line(210, 10) self.draw_lines(310, 10) self.draw_segments(10, 100) self.draw_rectangles(110, 100) self.draw_arcs(210, 100) self.draw_pixmap(310, 100) self.draw_polygon(10, 200) self.draw_rgb_image(110, 200) return True def draw_point(self, x, y): self.area.window.draw_point(self.gc, x+30, y+30) self.pangolayout.set_text("Point") self.area.window.draw_layout(self.gc, x+5, y+50, self.pangolayout) return def draw_points(self, x, y): points = [(x+10,y+10), (x+10,y), (x+40,y+30), (x+30,y+10), (x+50,y+10)] self.area.window.draw_points(self.gc, points) self.pangolayout.set_text("Points") self.area.window.draw_layout(self.gc, x+5, y+50, self.pangolayout) return def draw_line(self, x, y): self.area.window.draw_line(self.gc, x+10, y+10, x+20, y+30) self.pangolayout.set_text("Line") self.area.window.draw_layout(self.gc, x+5, y+50, self.pangolayout) return def draw_lines(self, x, y): points = [(x+10,y+10), (x+10,y), (x+40,y+30), (x+30,y+10), (x+50,y+10)] self.area.window.draw_lines(self.gc, points) self.pangolayout.set_text("Lines") self.area.window.draw_layout(self.gc, x+5, y+50, self.pangolayout) return def draw_segments(self, x, y): segments = ((x+20,y+10, x+20,y+70), (x+60,y+10, x+60,y+70), (x+10,y+30 , x+70,y+30), (x+10, y+50 , x+70, y+50)) self.area.window.draw_segments(self.gc, segments) self.pangolayout.set_text("Segments") self.area.window.draw_layout(self.gc, x+5, y+80, self.pangolayout) return def draw_rectangles(self, x, y): self.area.window.draw_rectangle(self.gc, False, x, y, 80, 70) self.area.window.draw_rectangle(self.gc, True, x+10, y+10, 20, 20) self.area.window.draw_rectangle(self.gc, True, x+50, y+10, 20, 20) self.area.window.draw_rectangle(self.gc, True, x+20, y+50, 40, 10) self.pangolayout.set_text("Rectangles") self.area.window.draw_layout(self.gc, x+5, y+80, self.pangolayout) return def draw_arcs(self, x, y): self.area.window.draw_arc(self.gc, False, x+10, y, 70, 70, 0, 360*64) self.area.window.draw_arc(self.gc, True, x+30, y+20, 10, 10, 0, 360*64) self.area.window.draw_arc(self.gc, True, x+50, y+20, 10, 10, 0, 360*64) self.area.window.draw_arc(self.gc, True, x+30, y+10, 30, 50, 210*64, 120*64) self.pangolayout.set_text("Arcs") self.area.window.draw_layout(self.gc, x+5, y+80, self.pangolayout) return def draw_pixmap(self, x, y): pixmap, mask = gtk.gdk.pixmap_create_from_xpm( self.area.window, self.style.bg[gtk.STATE_NORMAL], "gtk.xpm") self.area.window.draw_drawable(self.gc, pixmap, 0, 0, x+15, y+25, -1, -1) self.pangolayout.set_text("Pixmap") self.area.window.draw_layout(self.gc, x+5, y+80, self.pangolayout) return def draw_polygon(self, x, y): points = [(x+10,y+60), (x+10,y+20), (x+40,y+70), (x+30,y+30), (x+50,y+40)] self.area.window.draw_polygon(self.gc, True, points) self.pangolayout.set_text("Polygon") self.area.window.draw_layout(self.gc, x+5, y+80, self.pangolayout) return def draw_rgb_image(self, x, y): b = 80*3*80*['\0'] for i in range(80): for j in range(80): b[3*80*i+3*j] = chr(255-3*i) b[3*80*i+3*j+1] = chr(255-3*abs(i-j)) b[3*80*i+3*j+2] = chr(255-3*j) buff = string.join(b, '') self.area.window.draw_rgb_image(self.gc, x, y, 80, 80, gtk.gdk.RGB_DITHER_NONE, buff, 80*3) self.pangolayout.set_text("RGB Image") self.area.window.draw_layout(self.gc, x+5, y+80, self.pangolayout) return def main(): gtk.main() return 0 if __name__ == "__main__": DrawingAreaExample() main()