Navigation GPS

[rikky]

Thanks Joe, for testing.

Since I'm too lazy to compile the whole fossil bacon, I did a fossil bacon.sh
but that stucks already with the OPTION GUI TRUE not recognised.

But I incorporated the changes.
Does this however means that I have to FREE the return variable$ from  every FUNCTION?
This would make BaCon less intuitive, I suppose.

And why should I explicitly declare a variable with TYPE STRING if it normally does this automatically?

I have a warning also, already from the beginning.

Warning: no FREE for the memory address 'img__b2c__string_var' at line 244 in file 'OpenSeaGui.bac'!

this is presumably for this line:

img$ = CHOP$(ALIGN$(B64ENC$(BLOAD(string$), FILELEN(string$)), 64, 0))

I've got no idea how to FREE this line.
But it does not seem to harm.

Thanks.
 Rik.

[bigbass]

Hello Rik


you can solve all the problems easily
by giving a return type to the functions



using your original code
just this is needed


change
FUNCTION Y2LAT$(ytile,zoom)

for this
FUNCTION Y2LAT$(ytile,zoom) TYPE STRING


Note:( in other languages such C "the mother language of BaCon "
you get punished by the compiler for not
declaring types and returns from functions)

*BaCon does some of the clean up work for us automatically
so we can normally get away without the FREE and warnings

to have no warnings you can add
FREE img$

here
FUNCTION CONVERT_PNG2SVG$(string$) TYPE STRING

 RETURN header$ & img$ & footer$
 FREE img$


P.S I just try to get things to compile and run.
and document what I can along the way
only Peter knows if there are bugs or not
and if there are he is quick to fix them

Joe

just in case there is a doubt this compiles and runs

OPENSEAGUI.tar.gz (4.74 KB)

[alexfish]

Hi All

Have posted beta testing frame work POST #1, cleaned up version of previous demo's
+ implemented GPS Position

Please Note this will not work on PI3

I will be firing up the PI3 ,
and possible using original code base from the widget toolkit thread

BR
Alex

Attachments:

[alexfish]

As Regards Raspberry Pi3 users = not working

I did not receive a reply to this

this is not the first instance of a No Reply

the post.

Hi Rik

Not sure about PI3
Possible Memory allocation problem on cairo surface ADDED ,& or the position of the surface
Within the Window
But can test first few bits HERE

and report back here, will then look further for PI3

PI4 curl ? looks like something is Missing,

BR
Alex

Oh, Just seen Vovchik's post

The Link HERE

BR
Alex

[rikky]

this is not the first instance of a No Reply

This is when i haven't got a clue. 

[alexfish]

Hi Rik

With reference to PI 3
Let me know if the below archive compiles & the Window shows text + a button

This works on My PI 3 and PI 4 similar to what was done on X11 thread started by Vovchik

if this does not work then will need to look deeper.

saying that , think best option will be to use gtk2 + drawing area which has a cairo
back end . the gtk option is mentioned in previous page , which is not done as yet.
once window and Drawing area is in , the cairo bits from the x11/cairo demo
will just need to be copied over, to run one needs to expose the Cairo Context

BR
Alex

Attachments:

cairoX2.bac.bz2 (2.33 KB)

[rikky]

Oh, very nice.

Mouse works also, so you can drag your chart around and so on.
If I can use an SVG on that I will start to learn Cairo.

  Rik.

Btw Bigbass, 

Thanks for the explanation.
This is usefull information.
I have now TYPEd all my functions. 

[vovchik]

Dear Alex,

Thanks for cairoX2 - all works fine on Pi4 and Mint.

With kind regards,
vovchik

[alexfish]

Hi All

Thanks for testing

Now got Pi3 up + side by side with pi4

so will start modding the X11/cairo

Also done a quick demo of gtk drawing area + Ran Riks Seamap GUI to get composite image


the is a bit rough but , as with me again saying, hot of the press

the image is of the Whitby coords
./OpenSeaGui 54.48774  -0.61498 17

I need the run that command Twice , ?

the code as it is of now

PRAGMA OPTIONS `pkg-config --cflags gtk+-2.0 cairo`
PRAGMA LDFLAGS `pkg-config --libs gtk+-2.0 cairo`

PRAGMA INCLUDE <gtk-2.0/gtk/gtk.h>
PRAGMA INCLUDE <cairo/cairo.h>
OPTION PARSE FALSE
DECLARE window TYPE  GtkWindow*
DECLARE button TYPE GtkWidget*
DECLARE drawing TYPE GtkWidget*


SUB cairo_rgba(cairo_t * cr,char r,char g,char b,char a)
LOCAL R,G,B,A TYPE double
R = r/255.0
G = g/255.0
B = b/255.0
A = a/255.0
PRINT R , ":",G,":",B,":" ,A
cairo_set_source_rgba(cr , R ,G ,B,A)
END SUB


FUNCTION LOAD_PIX() TYPE int
LOCAL pixbuf TYPE GdkPixbuf *
LOCAL  width, height TYPE int

LOCAL surface TYPE cairo_surface_t *
LOCAL cr  TYPE  cairo_t *

cr = gdk_cairo_create ( (GdkDrawable *) drawing->window)
cairo_rgba(cr,255,230,0,255)
cairo_paint(cr)
cairo_save(cr)
cairo_restore(cr)

pixbuf = gdk_pixbuf_new_from_file ("/tmp/plotter/17/65311/41779/street.svg",0)
width = gdk_pixbuf_get_width (pixbuf)
height = gdk_pixbuf_get_height (pixbuf)
PRINT width , ":" , height

gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0)
cairo_paint(cr)
cairo_show_page(cr)
RETURN TRUE
END FUNCTION



'==========================
SUB hello
'==========================
PRINT "Hello BaCon"
END SUB

'==========================
SUB delete_event
'==========================
PRINT "That's all folks!"
END
END SUB


'==========================
SUB end_program
'==========================
PRINT "end"
END
END SUB

gtk_init(0, 0)
window = gtk_window_new (0)
gtk_window_set_default_size (window, 600, 400)
gtk_window_set_title (window, "cairo")


'---SIGNAL HANDLERS  for the window
g_signal_connect(window, "delete-event", G_CALLBACK(delete_event), NULL)
g_signal_connect(window, "destroy",  G_CALLBACK(end_program), NULL)

drawing=   gtk_drawing_area_new()

'---PACK THE BUTTON  into the window
gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(drawing))
gtk_widget_set_size_request (GTK_WIDGET(drawing), 600, 400)
g_signal_connect (G_OBJECT (drawing), "expose_event",G_CALLBACK (LOAD_PIX), NULL)
gtk_widget_show_all(GTK_WIDGET(window))
'
gtk_main()

BR
Alex

[rikky]

I need the run that command Twice , ?

Well,  yes.

I had to invent something to be able to feed new coordinates as you move along.
I chose to have the first time you start the program as a sort of daemon.
The next time the NEW coordinates are feeded to the first program and then exit.
The picture of the first program then changes.

Or so is the idea.

Of course there are millions of other solutions.
You have to choose something.

investigating your program, but (un)fortunately I am also drinking beer and talking about nothing.
If the police comes, then it will take a few days before I report back. 

[alexfish]

We need a bigger range of smilies

[rikky]

Tried everything.
Even did a 'fresh instal'
sudo apt-get install gtk+-2.0 libgtk2.0-dev glib-2.0 -y

it compiles but I still get

(Cairo_svg:27721): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_width: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(Cairo_svg:27721): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_height: assertion 'GDK_IS_PIXBUF (pixbuf)' failed
-1:-1

(Cairo_svg:27721): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_width: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(Cairo_svg:27721): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_height: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(Cairo_svg:27721): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_pixels_with_length: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(Cairo_svg:27721): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_rowstride: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(Cairo_svg:27721): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_n_channels: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(Cairo_svg:27721): GLib-ERROR **: /build/glib2.0-TptTYn/glib2.0-2.50.3/./glib/gmem.c:328: overflow allocating 4294967295*4294967295 bytes
Trace/breakpoint trap
If I remark out line 92

g_signal_connect (G_OBJECT (drawing), "expose_event",G_CALLBACK (LOAD_PIX), NULL)

then everything works fine.
I get a nice window on my screen, and no errors.
Except that there is nothing on it. 

Well this is probably my fault
I still have Stretch with Berryboot on my RPi3
There are some weird things with this system.

I will try to put OpenPlotter on it, ..again.
First time failed.

[alexfish]

Hi Rik

Try Install

libgdk-pixbuf2.0-dev

see what happens

BR
Alex

[rikky]

libgdk-pixbuf2.0-dev is already the newest version

[bigbass]

Hello Rik



I tried the demo Alex sent you
of your code openseagui with (gtk2 and cairo)
from Alex and it works for me


I have these installed (if the problem is only pixbuf)
gir1.2-gdkpixbuf-2.0
gtk2-engines-pixbuf
libgdk-pixbuf2.0-0
libgdk-pixbuf2.0-bin
libgdk-pixbuf2.0-common
libgdk-pixbuf2.0-dev

I would suggest for your RPI3

*that you now can use your RPI4
to make the sd for your RPI3
by installing


www.raspberrypi.org/documentation/installation/installing-images/
sudo apt install rpi-imager


even a video to see whats happening 40 seconds
www.youtube.com/watch?v=J024soVgEeM


select about@ 1.171GB
Raspberry Pi OS with desktop

and life will be good for you on the raspberry pi3 again


And if something happens
you can just make a new sd and be off sailing again quickly

Joe