i'm using goocanvas draw simple diagram on gtk frame , diagram dimensions based on values on same window. diagram should change it's dimensions in real time, when user changes values on interface using spinner buttons.
i managed render initial diagram on top of gtk window->hbox->frame.
problem when changes values. redraws on top of drawing.
so there "clear" functionality available goo canvas?
or there other method achieve desired results?
edit:
current code:
/* * compile me with: * gcc -o dia dia.c `pkg-config --libs --cflags gtk+-2.0 goocanvas` -rdynamic -i./headers/ -lm * */ #include <stdio.h> #include <gtk/gtk.h> #include <goocanvas.h> /*common structs , varaibles*/ struct dia_struct { gdouble diam; const gchar *tbp, *thtp, *wt; }; struct dia_struct set_dia; /* intitializing structure */ /* goo canvas items */ goocanvasitem *root, *path, *path2; gtkwidget *canvas; /* * function: ofdra * -------------------- * main function draw diagram on screen * * returns: none */ void ofdra (double diam) { double dfactor = diam*50; path = null; path2 = null; double x = (465-dfactor)/2; double y = 465-x; char buf[100]; char buf2[100]; sprintf(buf, "m 0 %f l 1000 %f", x, x); sprintf(buf2, "m 0 %f l 1000 %f", y, y); path = goo_canvas_path_new (root, buf, "stroke-color", "red", null); path2 = goo_canvas_path_new (root, buf2, "stroke-color", "red", null); /*goo_canvas_item_update (path, true, );*/ /*goo_canvas_item_update (path2);*/ } /* * function: ofruta * -------------------- * main function run when in user changed value. * * glade_wdgets: widget-object * poblist: array of objects go through * * returns: none */ void ofruta (gtkwidget *glade_wdgets, gpointer *poblist) { /* common varaibles needed */ struct dia_struct dia; /* intitializing structure */ /* getters */ dia.diam = gtk_spin_button_get_value (gtk_spin_button(poblist[0])); /* diameter reading */ set_diamond.diam = diamond.diam; gtk_spin_button_set_value(gtk_spin_button(poblist[0]), set_diamond.diam); /* loads dynamically generated diagram drawing */ ofdra(set_diamond.diam); } //=========================================================================== /* * main * * program begins here */ int main( int argc, char **argv ) { gtkbuilder *builder; gtkwidget *window; gerror *error = null; gtkbutton *button; gtklabel *label; cairo_surface_t *surface; /* init gtk+ */ gtk_init( &argc, &argv ); /* create new gtkbuilder object */ builder = gtk_builder_new(); /* load ui file. if error occurs, report , quit application. * replace "tut.glade" saved project. */ if( ! gtk_builder_add_from_file( builder, "dia_glade.glade", &error ) ) { g_warning( "%s", error->message ); g_free( error ); return( 1 ); } /* main window pointer ui */ window = gtk_widget( gtk_builder_get_object( builder, "window1" ) ); gpointer spinners[] = { gtk_builder_get_object( builder, "diam" )}; /* connect signals */ gtk_builder_connect_signals( builder, spinners ); g_signal_connect(g_object(window), "delete-event", (gcallback)gtk_main_quit, null); g_signal_connect(g_object("measure"), "clicked", (gcallback)ofruta, spinners); canvas = goo_canvas_new (); gtk_widget_set_size_request (canvas, 600, 465); goo_canvas_set_bounds (goo_canvas (canvas), 0, 0, 1000, 1000); gtk_widget_show (canvas); gtk_container_add (gtk_container (gtk_builder_get_object( builder, "draw_area" )), canvas); root = goo_canvas_get_root_item (goo_canvas (canvas)); /* destroy builder, since don't need anymore */ g_object_unref( g_object( builder ) ); /* show window. other widgets automatically shown gtkbuilder */ gtk_widget_show( window ); /* start main loop */ gtk_main(); return( 0 ); } when click on button called "measure" handler called "ofruta" in "ofruta" calls drawing function.
is correct method?
here example based on https://developer.gnome.org/goocanvas/unstable/goocanvas-model-view-canvas.html :
#include <stdlib.h> #include <goocanvas.h> static gboolean on_rect_button_press (goocanvasitem *view, goocanvasitem *target, gdkeventbutton *event, gpointer data); static gboolean on_delete_event (gtkwidget *window, gdkevent *event, gpointer unused_data); goocanvasitemmodel *root, *rect_model, *text_model, *path; int main (int argc, char *argv[]) { gtkwidget *window, *scrolled_win, *canvas; goocanvasitem *rect_item; gtk_set_locale (); gtk_init (&argc, &argv); window = gtk_window_new (gtk_window_toplevel); gtk_window_set_default_size (gtk_window (window), 640, 600); gtk_widget_show (window); g_signal_connect (window, "delete_event", (gtksignalfunc) on_delete_event, null); scrolled_win = gtk_scrolled_window_new (null, null); gtk_scrolled_window_set_shadow_type (gtk_scrolled_window (scrolled_win), gtk_shadow_in); gtk_widget_show (scrolled_win); gtk_container_add (gtk_container (window), scrolled_win); canvas = goo_canvas_new (); gtk_widget_set_size_request (canvas, 600, 450); goo_canvas_set_bounds (goo_canvas (canvas), 0, 0, 1000, 1000); gtk_widget_show (canvas); gtk_container_add (gtk_container (scrolled_win), canvas); root = goo_canvas_group_model_new (null, null); rect_model = goo_canvas_rect_model_new (root, 100, 100, 400, 400, "line-width", 10.0, "radius-x", 20.0, "radius-y", 10.0, "stroke-color", "yellow", "fill-color", "red", null); text_model = goo_canvas_text_model_new (root, "hello world", 300, 300, -1, gtk_anchor_center, "font", "sans 24", null); goo_canvas_item_model_rotate (text_model, 45, 300, 300); goo_canvas_set_root_item_model (goo_canvas (canvas), root); goocanvaslinedash *dash = goo_canvas_line_dash_new (2, 5.0, 5.0); const char *buf = "m 0 128 l 1000 256"; path = goo_canvas_path_model_new (root, buf, "stroke-color", "red", "line-dash", dash, null); rect_item = goo_canvas_get_item (goo_canvas (canvas), rect_model); g_signal_connect (rect_item, "button_press_event", (gtksignalfunc) on_rect_button_press, null); goo_canvas_line_dash_unref(dash); gtk_main (); return 0; } static gboolean on_rect_button_press (goocanvasitem *item, goocanvasitem *target, gdkeventbutton *event, gpointer data) { g_print ("rect item received button press event\n"); static float = 128, b = 256; += 16, b += 16; char buf[64]; snprintf(buf, sizeof(buf), "m 0 %f l 1000 %f", a, b); g_object_set(g_object(path), "data", buf, null); return true; } static gboolean on_delete_event (gtkwidget *window, gdkevent *event, gpointer unused_data) { exit (0); } by modifying path's data property g_object_set moves when click on rectangle occurs. properties names should taken documentation, e.g. https://developer.gnome.org/goocanvas/unstable/goocanvaspathmodel.html
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