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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
1. Q: I can't figure out the use of PlaceText/DrawString and Line -
It seems to me that if I want to draw a horizontal red line in the
main window, I could:
main_window *mw=new main_window("Hello",300,300);
setcolor(alloc_named_color("red"));
mw->Line(10,10,290,10);
but it doesn't work that way... how do I use placetext/drawstring/line?
A: Indeed, drawing does not work like you wrote. Well, it's quite the *default*
question about Grafix.
For drawing into a window you have to :
1. define a subclass of "window" (or some other window class)
2. overload its "redraw" method by a specific function that does the
desired drawing
3. create an instance of this new class as subwindow in your main_window.
4. invoke the main_loop to catch the X-events
eg. see "win-demo.c" :
....
// ** 1. define "my_window" as derived class of window
class my_window : public window {
public: my_window(window & parent, int w, int h, int x, int y) :
window(parent,w,h,x,y) {}
virtual void redraw() { // ** 2. virtual fn replaces window::redraw
int y; // and does the actual drawing
for (y=0; y < height ; y+= 3) line(0, y, width, y);
}
};
....
main(int argc, char *argv[]) {
main_window *mainw = new main_window(argv[0], 300, 300); // Main Window
.... -- other definititons --
new my_window(*mainw, 60, 60, 110, 0); // ** 3. create an instance
mainw->main_loop(); // ** 4. invoke X-event-loop
}
/******************************************************/
This seems quite complicated at a first glance, however, if you understand
a little bit more about X-window you will see that only this approach will work
with it.
BTW. this is also explained in HOWTO.txt :-)
--------------------------------------------------
2. Q:
> I am having trouble compiling your demos. I get the message
> cannot open -lX11. Also, I can't find any installation instructions.
> Can you help me?
A: You probably have an unusual path for your Xlib. Try to find the file
libX11.a on your system. It shoulb be located somewhere under
"/usr/X11/lib...", "/usr/X11R6/lib" or similiar.
Then add the path ( without the last "/lib") to the XPATH-macro in the
file "grafix.mk" eg :
ifeq ($(shell uname),Linux)
XPATH = /usr/X11R6
LFLAGS = -L$(XPATH)/lib
endif
and then make again.
The second possibility is you haven't installed Xlib on your system yet.
3. Q:
I'm trying grafix1.2 under linux (g++ 2.5.8). The previous version
worked perfectly. With the new version, make depend works, but make
gives...
window.c: In method `void scrolled_window::resize(int, int)':
window.c:1292: cannot convert to a pointer type
window.c:1298: cannot convert to a pointer type
make: *** [window.o] Error 1
Can you help please?
A: I would recommend installing a new gcc version. I use 2.6.3 and 2.7.0 which
work well. 2.5.8 has some flaws.
To solve your problem quickly try the following : change
vs = new vertical_shifter(*this,sz,h,w,0,sh, (CBHOOK) cbhook, this);
to
vs = new vertical_shifter(*this,sz,h,w,0,sh, (CBHOOK) &cbhook, this);
^
and the same modification in line 1298.
---------------------------------------------------------------------------
4. Q:
Question for you - Here's my situation:
1. I have a window that contains 10 buttons.
2. I want to destroy this window, reopen it with the same handle, a
and then put in 10 *different* buttons, and i want this to happen when
the user presses a completely different button in another part of
the main window.
3. Here's how I'm doing it:
'aux' is the handle to the window, as a child of the main window.
the buttons are put in with a simple 'new function_button(*aux...)'
When the user presses the activation button to move to the next
'page', I do this:
aux->UnMap();
delete aux;
Now I want to bring the window back in the same place, so I call the
same "aux=new window(...)" that I did when I *first* set it up.
I have to now call aux->Map() (not sure why) to make the window
exist. Then I try putting in buttons the same way as before :
new function_button(*aux ...)
but they never appear.
Any hints?
A:
First, you must keep in mind that using the same handler 'aux' for the new
window does not make any connection between the two windows.
It's simply a pointer variable that is set to another value.
Second, to make a new window appear on the screen together with its child
windows you have to use 'RealizeChildren' after they all are created.
Ie, the following statements should be used:
aux = new window(...);
new button(*aux,....); // some child windows of aux
...
aux->RealizeChildren();
--------------------------------------------------------------------------
5. Q:
class-browser says 'graph contains cycles' and crashes. Any ideas?
A:
The "cycles" problem in the class-browser occurs if you have a quite complex
inheritance graph. It is only a methodical problem to display these graphs, and
I hope to solve it the next release.
The problem arises e.g. when you have the following class inheritance :
Superclass
^ ^
/ |
Class2 |
^ |
\ |
Class3
Then it is not possible to compute an unique "depth" value which is needed
by the used method.
6. Q:
at which sites can I found the new version of grafix ?
A:
Usually, all mirrors of sunsite should have grafix in a subdirectory
/pub/Linux/X11/devel/c++libs or similiar.
A recent short archie inquiery showed the following list of ftp servers :
sites with grafix.1.2.tgz :
primary site
============
sunsite.unc.edu /pub/Linux/X11/devel/c++libs (or /incoming)
found on archie : host archie.funet.fi :
========================================
ftp.warwick.ac.uk /pub/linux/sunsite.unc-mirror/X11/devel
ftp.ms.mff.cuni.cz /MIRRORS/ftp.ibp.fr/linux/distributions/jurix/source/X11/libs
/MIRRORS/sunsite.unc.edu/Linux/X11/devel
/OS/Linux/distributions/jurix/source/X11/libs
ftp.vse.cz /pub/386-unix/linux/X11/devel
romeo-klive.nvg.unit.no /pub/linux/sunsite/X11/devel
sunsite.doc.ic.ac.uk /computing/operating-systems/Linux/sunsite.unc-mirror/X11/devel
found on other archies :
========================
parnas.mimuw.edu.pl /linux/X11/devel
from archie.univie.ac.at :
ftp.cc.duth.gr /pub/unix/Linux/sunsite/X11/devel
ftp.ibp.fr /pub3/linux/sunsite/X11/devel
/pub2/linux/distributions/jurix/source/X11/libs
ftp.kfki.hu /pub/linux/X11/devel
ftp.loria.fr /pub/linux/sunsite/X11/devel
ftp.switch.ch /mirror/linux/sunsite/X11/devel
ftp.univie.ac.at /systems/linux/sunsite/X11/devel
sunsite.icm.edu.pl /pub2/linux/X11/devel
old versions :
=============
/archive/comp/sources/misc/volume46/grafix
----------------------------------------------------------------------------
|
