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# python port of canvas-curve.c from demos dir of libgnomecanvas
# as such, under GPL
# FIXME: it seems to be somewhat broken...
import gtk
import gtk.gdk # event types
import gnomecanvas
STATE_INIT, STATE_FIRST_PRESS, STATE_FIRST_RELEASE, STATE_SECOND_PRESS = tuple(range(4))
class CurveExample:
def __init__(self):
self.width = 400
self.height = 400
#static State current_state;
self.current_state = STATE_INIT # initialized to 0?
#static GnomeCanvasItem *current_item;
self.current_item = None
#static GnomeCanvasPoints *current_points;
self.current_points = [] # list of tuples of coordinates
# Open window to hold canvas.
win = gtk.Window()
#win.connect('destroy', mainquit)
win.set_title('Canvas Example')
# Create VBox to hold canvas and buttons.
vbox = gtk.VBox()
win.add(vbox)
vbox.show()
# Some instructions for people using the example:
label = gtk.Label("Drag - move object.\n" +
"Double click - change colour\n" +
"Right click - delete object")
vbox.pack_start(label, expand=False)
label.show()
# Create canvas.
self.acanvas = gnomecanvas.Canvas()
self.acanvas.set_size_request(self.width, self.height)
self.acanvas.set_scroll_region(0,0, self.width, self.height)
vbox.pack_start(self.acanvas)
self.acanvas.show()
# FIXME: connect callback
item = self.acanvas.root().add(gnomecanvas.CanvasRect,
outline_color= "black", fill_color= "white",
x1= 0.0, y1= 0.0, x2= self.width, y2= self.height)
item.connect("event", self.canvas_event)
win.show()
def canvas_event(self, item, event, *args):# need re-check!!
#print args
#print item, event
if event.type == gtk.gdk.BUTTON_PRESS:
if event.button != 1:
pass
if self.current_state == STATE_INIT:
self.draw_curve(item, event.x, event.y)
self.current_state = STATE_FIRST_PRESS
elif self.current_state == STATE_FIRST_RELEASE:
self.draw_curve(item, event.x, event.y)
self.current_state = STATE_SECOND_PRESS
elif self.current_state == STATE_SECOND_PRESS:
self.draw_curve(item, event.x, event.y)
self.current_state = STATE_INIT
else:
0/0 # can't happen
if event.type == gtk.gdk.BUTTON_RELEASE:
if event.button != 1:
pass
if self.current_state == STATE_FIRST_PRESS:
self.draw_curve(item, event.x, event.y)
self.current_state = STATE_FIRST_RELEASE
pass
if event.type == gtk.gdk.MOTION_NOTIFY:
if self.current_state==STATE_FIRST_PRESS:
self.draw_curve(item, event.x, event.y)
return False
def item_event(self, item, event, *args):
#print args
#FIXME: does this work: ?
if (event.type == gtk.gdk.BUTTON_PRESS) and (event.button == 1) and (event.state & gtk.gdk.SHIFT_MASK):
item.destroy()
if (item == self.current_item):
self.current_item = None
self.current_state = STATE_INIT
return True
return False
def draw_curve(self, item, x, y):
#GnomeCanvasPathDef *path_def;
#GnomeCanvasGroup *root;
#root = GNOME_CANVAS_GROUP (item->parent);
if self.current_state == STATE_INIT:
#if self.current_item is None:
# g_assert (!current_item); (but that shouln't happen)
#FIXEM: port creation of paths
if self.current_points is None:
current_points = []
self.current_points.append((x,y))
elif self.current_state == STATE_FIRST_PRESS:
self.current_points = self.current_points[:1]
self.current_points.append((x,y))
#coords [2] = x;
#current_points->coords [3] = y;
path=[]
path.append((gnomecanvas.MOVETO_OPEN, 0,0))
path.append((gnomecanvas.MOVETO,
self.current_points[0][0], self.current_points[0][1]))
path.append((gnomecanvas.LINETO,
self.current_points[1][0], self.current_points[1][1]))
path_def = gnomecanvas.path_def_new(path)
if self.current_item:
self.current_item.set_bpath(path_def)
else:
self.current_item = self.acanvas.root().add(
gnomecanvas.CanvasBpath,
outline_color="blue",
width_pixels= 5,
cap_style=gtk.gdk.CAP_ROUND)
self.current_item.set_bpath(path_def)
self.current_item.connect('event', self.item_event)
elif self.current_state == STATE_FIRST_RELEASE:
#g_assert (current_item);
self.current_points.append((x,y))
#current_points->coords [4] = x;
#current_points->coords [5] = y;
path=[]
#path_def = gnome_canvas_path_def_new ();
path.append((gnomecanvas.MOVETO_OPEN, 0,0))
path.append((gnomecanvas.MOVETO,
self.current_points[0][0], self.current_points[0][1]))
path.append((gnomecanvas.CURVETO,
self.current_points[2][0], self.current_points[2][1],
self.current_points[2][0], self.current_points[2][1],
self.current_points[1][0], self.current_points[1][1]))
path_def = gnomecanvas.path_def_new(path)
self.current_item.set_bpath(path_def)
#gnome_canvas_path_def_unref (path_def);
elif self.current_state == STATE_SECOND_PRESS:
#g_assert (current_item);
self.current_points.append((x,y))
#current_points->coords [6] = x;
#current_points->coords [7] = y;
path=[]
path.append((gnomecanvas.MOVETO_OPEN, 0,0))
path.append((gnomecanvas.MOVETO,
self.current_points[0][0], self.current_points[0][1]))
path.append((gnomecanvas.CURVETO,
self.current_points[2][0], self.current_points[2][1],
self.current_points[3][0], self.current_points[3][1],
self.current_points[1][0], self.current_points[1][1]))
path_def = gnomecanvas.path_def_new(path)
self.current_item.set_bpath(path_def)
#gnome_canvas_path_def_unref (path_def);
self.current_item = None
else:
0/0# shouldn't happen
if __name__ == '__main__':
c = CurveExample()
gtk.main()
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