1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
// Scribble.cs - port of Gtk+ scribble demo
//
// Author: Rachel Hestilow <hestilow@ximian.com>
//
// (c) 2002 Rachel Hestilow
namespace GtkSamples {
using Gtk;
using Gdk;
using System;
public class Scribble {
private static Gtk.DrawingArea darea;
private static Gdk.Pixmap pixmap = null;
public static int Main (string[] args)
{
Application.Init ();
Gtk.Window win = new Gtk.Window ("Scribble demo");
win.DeleteEvent += new DeleteEventHandler (Window_Delete);
darea = new Gtk.DrawingArea ();
darea.SetSizeRequest (200, 200);
win.Add (darea);
darea.ExposeEvent += new ExposeEventHandler (ExposeEvent);
darea.ConfigureEvent += new ConfigureEventHandler (ConfigureEvent);
darea.MotionNotifyEvent += new MotionNotifyEventHandler (MotionNotifyEvent);
darea.ButtonPressEvent += new ButtonPressEventHandler (ButtonPressEvent);
darea.Events = EventMask.ExposureMask | EventMask.LeaveNotifyMask |
EventMask.ButtonPressMask | EventMask.PointerMotionMask |
EventMask.PointerMotionHintMask;
win.ShowAll ();
Application.Run ();
return 0;
}
static void Window_Delete (object obj, DeleteEventArgs args)
{
Application.Quit ();
args.RetVal = true;
}
static void ExposeEvent (object obj, ExposeEventArgs args)
{
Gdk.Rectangle area = args.Event.Area;
args.Event.Window.DrawDrawable (darea.Style.BlackGC,
pixmap,
area.X, area.Y,
area.X, area.Y,
area.Width, area.Height);
args.RetVal = false;
}
static void ConfigureEvent (object obj, ConfigureEventArgs args)
{
Gdk.EventConfigure ev = args.Event;
Gdk.Window window = ev.Window;
Gdk.Rectangle allocation = darea.Allocation;
pixmap = new Gdk.Pixmap (window, allocation.Width, allocation.Height, -1);
pixmap.DrawRectangle (darea.Style.WhiteGC, true, 0, 0,
allocation.Width, allocation.Height);
args.RetVal = true;
}
static void DrawBrush (double x, double y, bool black)
{
Gdk.Rectangle update_rect = new Gdk.Rectangle ();
update_rect.X = (int) x - 5;
update_rect.Y = (int) y - 5;
update_rect.Width = 10;
update_rect.Height = 10;
pixmap.DrawRectangle (black ? darea.Style.BlackGC : darea.Style.WhiteGC, true,
update_rect.X, update_rect.Y,
update_rect.Width, update_rect.Height);
darea.QueueDrawArea (update_rect.X, update_rect.Y,
update_rect.Width, update_rect.Height);
}
static void ButtonPressEvent (object obj, ButtonPressEventArgs args)
{
Gdk.EventButton ev = args.Event;
if (ev.Button == 1 && pixmap != null)
DrawBrush (ev.X, ev.Y, true);
else if (ev.Button == 3 && pixmap != null)
DrawBrush (ev.X, ev.Y, false);
args.RetVal = true;
}
static void MotionNotifyEvent (object obj, MotionNotifyEventArgs args)
{
int x, y;
Gdk.ModifierType state;
Gdk.EventMotion ev = args.Event;
Gdk.Window window = ev.Window;
if (ev.IsHint) {
Gdk.ModifierType s;
window.GetPointer (out x, out y, out s);
state = s;
} else {
x = (int) ev.X;
y = (int) ev.Y;
state = ev.State;
}
if ((state & Gdk.ModifierType.Button1Mask) != 0 && pixmap != null)
DrawBrush (x, y, true);
else if ((state & Gdk.ModifierType.Button3Mask) != 0 && pixmap != null)
DrawBrush (x, y, false);
args.RetVal = true;
}
}
}
|
