Alexei Gilchrist wrote:
Hi, I'm trying to set a customised cursor for a drawing application. I want the cursor to
reflect the size and color of the selected pen.
pm=gtk.gdk.Pixmap(page.canvas.window,10,10,1)
gc = pm.new_gc(foreground=gtk.gdk.color_parse('black'))
pm.draw_rectangle(gc, True, 0, 0, 9, 9)
mask=gtk.gdk.Pixmap(page.canvas.window,10,10,1)
gc = mask.new_gc(foreground = gtk.gdk.color_parse('white'))
mask.draw_rectangle(gc, False, 0, 0, 9, 9)
cur=gtk.gdk.Cursor(pm, mask, gtk.gdk.color_parse('white'),
gtk.gdk.color_parse('black'), 5, 5)
page.canvas.window.set_cursor(cur)
What I get is a whole lot of random garbage in a square roughly the right size. If I set the depth
of pm to -1, I get an X error ('BadMatch (invalid parameter attributes)') and the program crashes.
Could anyone give me some pointers to fix this?
Also, I'm not very clear on the role's of the fg and bg in the Cursor
contructor, the documentation
is not very illuminating:
fg : the unallocated foreground gtk.gdk.Color
bg : the unallocated background gtk.gdk.Color
'unallocated' ??
You need to use an allocated color for the gc foreground color - first
get a colormap and then allocate the colors black and white for drawing
on the bitmaps:
w=gtk.Window()
pm = gtk.gdk.Pixmap(None,10,10,1)
mask = gtk.gdk.Pixmap(None,10,10,1)
colormap = gtk.gdk.colormap_get_system()
black = colormap.alloc_color('black')
white = colormap.alloc_color('white')
Create two GCs - one each for black and white:
bgc = pm.new_gc(foreground=black)
wgc = pm.new_gc(foreground=white)
Use the black gc to clear the pixmap and mask:
mask.draw_rectangle(bgc,True,0,0,10,10)
pm.draw_rectangle(bgc,True,0,0,10,10)
Use the white gc to set the bits in the pixmap and mask:
pm.draw_arc(wgc,True,0,2,10,5,0,360*64)
mask.draw_rectangle(wgc,True,0,0,10,10)
Then create and set the cursor using unallocated colors:
cur=gtk.gdk.Cursor(pm,mask,gtk.gdk,color_parse('green'),
gtk.gdk.color_parse('red'),5,5)
w.window.set_cursor(cur)
Should have a green oval in a red background for the window cursor.
John
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