GTK+ Forums

psaval · Familiar Face Joined: 20 Feb 2009 Posts: 7

Hi to all. I'm a spanish student working on his finall project. I'm a begginer programming, so don't be rude with me.

We have a dsPIC reading temperatures and humidity, saving it into a .txt. As this is hard to manage, I have the purpose of writing a gtk aplication that reads the file, takes 2 dates, and show the data contained in the file and it's between the 2 dates with a graph.
I have used a GTK assistant, a gtk_file_chooser, 2 gtk calendars and a gtk curve because of it's easyness- but the problem is that when i set the curve as a spline or linear, only interpolates 9 points, and that's not a good way to show the data :( So i think i will have to draw it by my own, but due my lack of experience and knowledgement, i can't even put a drawnable area. every single example i have seen does not compile under codeblocks (I hope someone can help with this)

But here is my example:

main.cpp

Code: (Plaintext)

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/***************************************************************************************/

/*INCLUDES*/

/***************************************************************************************/

#include <cairo/cairo.h>

#include <pango/pango.h>

#include <string.h>

#include <gtk/gtk.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <stdlib.h>

#include <unistd.h>

#include <stdio.h>

//#include "demo-common.h"

#include <gtk/gtkwindow.h>

//#include "func.c"

GtkWidget* do_assistant (GtkWidget *do_widget);

gchar *parametro_1, *parametro_2, *parametro_3=NULL;

/***************************************************************************************/

/*DEFINICION DE FUNCIONES*/

/***************************************************************************************/

static GtkWidget *window = NULL;

/***************************************************************************************/

/**/

/***************************************************************************************/

/***************************************************************************************/

/*FUNCION PRINCIPAL*/

/***************************************************************************************/

int main(int argc, char *argv[])

{

unsigned int i=0;

gtk_init(&argc, &argv);

if (argc>=3)

{

for (i=0;argv[i];i++)

{

printf("argumento %u: %s\n",i,argv[i]);

}

parametro_1 = argv[1];

parametro_2 = argv[2];

parametro_3 = argv[3];

printf("hay %d argumentos\n",argc);

printf("path encontrado %s\n",parametro_3);

}

window = do_assistant(window);

gtk_widget_show_all(window);

gtk_main();

return 0;

}

func.cpp

Code: (Plaintext)

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/***************************************************************************************/

/*INCLUDES*/

/***************************************************************************************/

#include <stdlib.h>

#include <string.h>

#include <gtk/gtk.h>

#include <gtk/gtkwindow.h>

struct reg_sensor {

char nombremaquina[3];

char fecha[12];

char hora[12];

double temp1;

double temp2;

double humedad1;

double humedad2;

double reservado1;

double reservado2;

double reservado3;

double reservado4;

double luminosidad1;

double reservado5;

double reservado6;

double reservado7;

};

typedef struct reg_sensor registro_sensor;

unsigned int nregistro = 0;

unsigned int arraytemp[500000][3];

unsigned int fecha_inicial[3];

unsigned int fecha_final[3];

unsigned int fecha3[3];

gchar date_start[16];

gchar date_end[16];

registro_sensor *arrayRegistros=NULL;

/***************************************************************************************/

/*DEFINICION DE FUNCIONES*/

/***************************************************************************************/

gfloat vector1[30];

static void on_assistant_apply (GtkWidget *widget, gpointer data);

static void on_assistant_close_cancel (GtkWidget *widget, gpointer data);

static void on_assistant_prepare (GtkWidget *widget, GtkWidget *page, gpointer data);

static void on_entry_changed (GtkWidget *widget, gpointer data);

static void create_page1 (GtkWidget *assistant);

static void create_page2 (GtkWidget *assistant);

static void create_page3 (GtkWidget *assistant);

static void create_page4 (GtkWidget *assistant);

static void create_page5 (GtkWidget *assistant);

void seleccion(GtkCalendar *calendar,gpointer user_data);

void seleccion2(GtkCalendar *calendar,gpointer user_data);

static void curva_temp1();

static void curva_temp2();

static void curva_hume1();

static void curva_hume2();

static void curva_linear ();

static void curva_spline ();

static void curva_free ();

GtkWidget* do_assistant (GtkWidget *do_widget);

GtkWidget *assistant,*label1, *label2, *label3, *label4;

//GtkWidget* lookup_widget (GtkWidget *widget,

// const gchar *widget_name);

static GtkWidget *entry = NULL;

static GtkWidget *entry1 = NULL;

static GtkWidget *entry2 = NULL;

static GtkWidget *curva = NULL;

static gchar *path;

extern gchar *parametro_1, *parametro_2, *parametro_3;

void abrir_archivo();

void seleccionar_fecha_1();

void leer_archivo(const gchar *selected_filename);

//void ver_archivo(GtkWidget *pFileSelection, char *pFileContent);

void about();

/***************************************************************************************/

/*CREACION DEL ASISTENTE*/

/***************************************************************************************/

GtkWidget* do_assistant (GtkWidget *do_widget)

{

entry = gtk_entry_new();

gchar fetemp1[16];

gchar fetemp2[16];

gchar fetemp3[16];

if (!assistant)

{

assistant = gtk_assistant_new ();

gtk_window_set_default_size (GTK_WINDOW (assistant), 480, 300);

gtk_window_set_position(GTK_WINDOW(assistant), GTK_WIN_POS_CENTER);

//gtk_window_set_screen (GTK_WINDOW (assistant), gtk_widget_get_screen (do_widget));

create_page1 (assistant);

create_page2 (assistant);

create_page3 (assistant);

create_page4 (assistant);

create_page5 (assistant);

g_signal_connect (G_OBJECT (assistant), "cancel", G_CALLBACK (on_assistant_close_cancel), &assistant);

g_signal_connect (G_OBJECT (assistant), "close", G_CALLBACK (on_assistant_close_cancel), &assistant);

g_signal_connect (G_OBJECT (assistant), "apply", G_CALLBACK (on_assistant_apply), NULL);

g_signal_connect (G_OBJECT (assistant), "prepare", G_CALLBACK (on_assistant_prepare), NULL);

if (parametro_3 != NULL)

{

gtk_entry_set_text(GTK_ENTRY(entry), parametro_3);

g_signal_connect (G_OBJECT (entry), "changed", G_CALLBACK (on_entry_changed), assistant);

}

}

if (parametro_1 != NULL)

{

gtk_entry_set_text(GTK_ENTRY(entry1), parametro_1);

fetemp1[0]=parametro_1[0];

fetemp1[1]=parametro_1[1];

fetemp1[2]='\0';

fecha_inicial[0]=atoi(fetemp1);

printf("el dia inicial pasado por parametro es: %d\n",fecha_inicial[0]);

fetemp2[0]=parametro_1[3];

fetemp2[1]=parametro_1[4];

fetemp2[2]='\0';

fecha_inicial[1]=(atoi(fetemp2));

printf("el mes inicial pasado por parametro es: %d",fecha_inicial[1]);

fetemp3[0]=parametro_1[6];

fetemp3[1]=parametro_1[7];

fetemp3[2]=parametro_1[8];

fetemp3[3]=parametro_1[9];

fetemp3[4]='\0';

fecha_inicial[2]=(atoi(fetemp3));

printf("el anno inicial pasado por parametro es: %d\n",fecha_inicial[2]);

}

if (parametro_2 != NULL)

{

gtk_entry_set_text(GTK_ENTRY(entry2), parametro_2);

fetemp1[0]=parametro_2[0];

fetemp1[1]=parametro_2[1];

fetemp1[2]='\0';

fecha_final[0]=atoi(fetemp1);

printf("el dia inicial pasado por parametro es: %d\n",fecha_final[0]);

fetemp2[0]=parametro_2[3];

fetemp2[1]=parametro_2[4];

fetemp2[2]='\0';

fecha_final[1]=(atoi(fetemp2));

printf("el mes inicial pasado por parametro es: %d",fecha_final[1]);

fetemp3[0]=parametro_2[6];

fetemp3[1]=parametro_2[7];

fetemp3[2]=parametro_2[8];

fetemp3[3]=parametro_2[9];

fetemp3[4]='\0';

fecha_final[2]=(atoi(fetemp3));

printf("el anno inicial pasado por parametro es: %d\n",fecha_final[2]);

}

if (!GTK_WIDGET_VISIBLE (assistant))

{

gtk_widget_show (assistant);

}

else

{

gtk_widget_destroy (assistant);

assistant = NULL;

}

return assistant;

}

/***************************************************************************************/

/*ULTIMA VENTANA DEL ASISTENTE*/

/***************************************************************************************/

static void on_assistant_apply (GtkWidget *widget, gpointer data)

{

GtkWidget *dialog;

dialog = gtk_message_dialog_new(GTK_WINDOW(assistant),

GTK_DIALOG_MODAL,

GTK_MESSAGE_INFO,

GTK_BUTTONS_OK,

"Asistente Completado.\n\nDibujar Gr\u00E1fico");

gtk_window_set_title(GTK_WINDOW(dialog), "Finalizar");

gtk_window_set_position(GTK_WINDOW(dialog), GTK_WIN_POS_CENTER);

switch(gtk_dialog_run(GTK_DIALOG(dialog)))

{

case GTK_RESPONSE_OK: // Selección del botón "Si"

g_print("Aceptar\n\n");

gtk_widget_destroy(GTK_WIDGET(assistant));

break;

default: // Selección del botón cerrar "X"

g_print("Cerrar\n\n");

break;

}

gtk_widget_destroy(GTK_WIDGET(dialog));

}

/***************************************************************************************/

/*CERRAMOS EL ASISTENTE ANTES DE HORA*/

/***************************************************************************************/

static void on_assistant_close_cancel (GtkWidget *widget, gpointer data)

{

GtkWidget *dialog;

dialog = gtk_message_dialog_new(GTK_WINDOW(assistant),

GTK_DIALOG_MODAL,

GTK_MESSAGE_WARNING,

GTK_BUTTONS_YES_NO,

"\u00BFDesea salir de la aplicaci\u00F3n?");

gtk_window_set_title(GTK_WINDOW(dialog), "Advertencia");

gtk_window_set_position(GTK_WINDOW(dialog), GTK_WIN_POS_CENTER);

switch(gtk_dialog_run(GTK_DIALOG(dialog)))

{

case GTK_RESPONSE_YES: // Selección del botón "Si"

g_print("Si\n");

gtk_widget_destroy(GTK_WIDGET(assistant));

break;

case GTK_RESPONSE_NO: // Selección del botón "No"

g_print("No \n\n");

break;

default: // Selección del botón cerrar "X"

g_print("Cerrar\n\n");

break;

}

gtk_widget_destroy(GTK_WIDGET(dialog));

}

/***************************************************************************************/

/*TITULO DE LA VENTANA*/

/***************************************************************************************/

static void on_assistant_prepare (GtkWidget *widget, GtkWidget *page, gpointer data)

{

gint current_page, n_pages;

gchar *title;

current_page = gtk_assistant_get_current_page (GTK_ASSISTANT (widget));

n_pages = gtk_assistant_get_n_pages (GTK_ASSISTANT (widget));

title = g_strdup_printf ("Asistente (%d de %d)", current_page + 1, n_pages);

gtk_window_set_title (GTK_WINDOW (widget), title);

g_free (title);

}

/***************************************************************************************/

/**/

/***************************************************************************************/

static void on_entry_changed (GtkWidget *widget, gpointer data)

{

GtkAssistant *assistant = GTK_ASSISTANT (data);

GtkWidget *current_page;

gint page_number;

const gchar *text;

// page_number = gtk_assistant_get_current_page (assistant);

page_number = 1;

current_page = gtk_assistant_get_nth_page (assistant, page_number);

text = gtk_entry_get_text (GTK_ENTRY (widget));

if (text && text[0])

{

gtk_assistant_set_page_complete (assistant, current_page, TRUE);

}

else

{

gtk_assistant_set_page_complete (assistant, current_page, FALSE);

}

}

/***************************************************************************************/

/**/

/***************************************************************************************/

static void create_page1 (GtkWidget *assistant)

{

GtkWidget *label;

GdkPixbuf *pixbuf;

label = gtk_label_new ("Este asistente le ayudar\u00E1 a mostrar gr\u00E1ficamente\nlas estad\u00EDsticas obtenidas con sus sensores.\n\nPulse adelante para continuar.");

gtk_widget_show (label);

gtk_assistant_append_page (GTK_ASSISTANT (assistant), label);

gtk_assistant_set_page_complete (GTK_ASSISTANT (assistant), label, TRUE);

gtk_assistant_set_page_title (GTK_ASSISTANT (assistant), label, "P\u00E1gina 1: Bienvenido");

gtk_assistant_set_page_type (GTK_ASSISTANT (assistant), label, GTK_ASSISTANT_PAGE_INTRO);

pixbuf = gtk_widget_render_icon (assistant, GTK_STOCK_DIALOG_INFO, GTK_ICON_SIZE_DIALOG, NULL);

gtk_assistant_set_page_header_image (GTK_ASSISTANT (assistant), label, pixbuf);

g_object_unref (pixbuf);

}

/***************************************************************************************/

/**/

/***************************************************************************************/

static void create_page2 (GtkWidget *assistant)

{

GtkWidget *box, *label, *button, *table;

GdkPixbuf *pixbuf;

box = gtk_hbox_new (FALSE, 12);

table = gtk_table_new (4, 4, FALSE);

//gtk_table_set_col_spacing (GTK_TABLE (table), 10, 10);

gtk_table_set_row_spacings (GTK_TABLE (table), 40);

gtk_container_add (GTK_CONTAINER (box), table);

gtk_container_border_width(GTK_CONTAINER (table), 24);

label = gtk_label_new ("Seleccione el archivo:");

g_signal_connect (G_OBJECT (entry), "changed", G_CALLBACK (on_entry_changed), assistant);

button = gtk_button_new_with_label ("Examinar...");

g_signal_connect (G_OBJECT(button), "clicked", G_CALLBACK(abrir_archivo), (gpointer) assistant);

gtk_table_attach_defaults (GTK_TABLE (table), label, 0, 1, 2, 3);

gtk_table_attach_defaults (GTK_TABLE (table), entry, 1, 2, 2, 3);

gtk_table_attach_defaults (GTK_TABLE (table), button, 2, 3, 2, 3);

gtk_widget_show_all (box);

gtk_assistant_append_page (GTK_ASSISTANT (assistant), box);

gtk_assistant_set_page_title (GTK_ASSISTANT (assistant), box, "P\u00E1gina 2: Selecciona el fichero");

gtk_assistant_set_page_type (GTK_ASSISTANT (assistant), box, GTK_ASSISTANT_PAGE_CONTENT);

pixbuf = gtk_widget_render_icon (assistant, GTK_STOCK_DIRECTORY, GTK_ICON_SIZE_DIALOG, NULL);

gtk_assistant_set_page_header_image (GTK_ASSISTANT (assistant), box, pixbuf);

g_object_unref (pixbuf);

}

/***************************************************************************************/

/**/

/***************************************************************************************/

static void create_page3 (GtkWidget *assistant)

{

GtkWidget *box, *calendar1, *calendar2, *table,*label1, *label2;

GdkPixbuf *pixbuf;

box = gtk_hbox_new (FALSE, 12);

table = gtk_table_new (4, 4, FALSE);

gtk_table_set_row_spacings (GTK_TABLE (table), 40);

gtk_container_add (GTK_CONTAINER (box), table);

gtk_container_border_width(GTK_CONTAINER (table), 24);

label1 = gtk_label_new ("Seleccione la fecha inicial");

label2 = gtk_label_new ("Seleccione la fecha final");

entry1 = gtk_entry_new ();

entry2 = gtk_entry_new ();

g_signal_connect (G_OBJECT (entry), "changed", G_CALLBACK (on_entry_changed), assistant);

calendar1 = gtk_calendar_new ();

gtk_widget_set_size_request (calendar1, 241, 186);

gtk_calendar_display_options (GTK_CALENDAR (calendar1),

(GtkCalendarDisplayOptions) (GTK_CALENDAR_SHOW_HEADING | GTK_CALENDAR_SHOW_DAY_NAMES) );

g_signal_connect (G_OBJECT (calendar1), "day_selected", G_CALLBACK (seleccion), assistant);

calendar2 = gtk_calendar_new ();

gtk_widget_set_size_request (calendar2, 241, 186);

gtk_calendar_display_options (GTK_CALENDAR (calendar2),

(GtkCalendarDisplayOptions) (GTK_CALENDAR_SHOW_HEADING | GTK_CALENDAR_SHOW_DAY_NAMES) );

g_signal_connect ((gpointer) calendar2, "day_selected",

G_CALLBACK (seleccion2), NULL);

gtk_table_attach_defaults (GTK_TABLE (table), label1, 0, 1, 0, 1);

gtk_table_attach_defaults (GTK_TABLE (table), label2, 1, 2, 0, 1);

gtk_table_attach_defaults (GTK_TABLE (table), entry1, 0, 1, 1, 2);

gtk_table_attach_defaults (GTK_TABLE (table), entry2, 1, 2, 1, 2);

gtk_table_attach_defaults (GTK_TABLE (table), calendar1, 0, 1, 2, 3);

gtk_table_attach_defaults (GTK_TABLE (table), calendar2, 1, 2, 2, 3);

gtk_assistant_append_page (GTK_ASSISTANT (assistant), box);

gtk_assistant_set_page_complete (GTK_ASSISTANT (assistant), box, TRUE);

gtk_assistant_set_page_title (GTK_ASSISTANT (assistant), box, "P\u00E1gina 3: Selecciona los datos");

gtk_assistant_set_page_type (GTK_ASSISTANT (assistant), box, GTK_ASSISTANT_PAGE_CONTENT);

pixbuf = gtk_widget_render_icon (assistant, GTK_STOCK_PREFERENCES, GTK_ICON_SIZE_DIALOG, NULL);

gtk_assistant_set_page_header_image (GTK_ASSISTANT (assistant), box, pixbuf);

g_object_unref (pixbuf);

}

/***************************************************************************************/

/**/

/***************************************************************************************/

static void create_page4_prepare (GtkWidget *assistant);

static void create_page4 (GtkWidget *assistant)

{

GtkWidget *box, *table, *boton1, *boton2, *boton3, *boton4, *boton5, *boton6, *boton7;

GdkPixbuf *pixbuf;

box = gtk_vbox_new (FALSE, 12);

table = gtk_table_new (6, 6, FALSE);

gtk_table_set_row_spacings (GTK_TABLE (table), 40);

gtk_container_add (GTK_CONTAINER (box), table);

gtk_container_border_width(GTK_CONTAINER (table), 24);

curva = gtk_curve_new();

gtk_curve_set_range (GTK_CURVE(curva), -2, 2, -2, 2);

label1 = gtk_label_new ("valor maximo: ");

label2 = gtk_label_new ("valor minimo: ");

label3 = gtk_label_new ("Fecha inicial: ");

label4 = gtk_label_new ("Fecha final: ");

//gtk_label_set_text (GTK_LABEL (label1), "valor maximo 2:");

boton1 = gtk_button_new_with_label ("Temperaturas 1");

g_signal_connect (G_OBJECT(boton1), "clicked", G_CALLBACK(curva_temp1), (gpointer) assistant);

boton2 = gtk_button_new_with_label ("Temperaturas 2");

g_signal_connect (G_OBJECT(boton2), "clicked", G_CALLBACK(curva_temp2), (gpointer) assistant);

boton3 = gtk_button_new_with_label ("Humedad 1");

g_signal_connect (G_OBJECT(boton3), "clicked", G_CALLBACK(curva_hume1), (gpointer) assistant);

boton4 = gtk_button_new_with_label ("Humedad 2");

g_signal_connect (G_OBJECT(boton4), "clicked", G_CALLBACK(curva_hume2), (gpointer) assistant);

boton5 = gtk_button_new_with_label ("linear");

g_signal_connect (G_OBJECT(boton5), "clicked", G_CALLBACK(curva_linear), (gpointer) assistant);

boton6 = gtk_button_new_with_label ("spline");

g_signal_connect (G_OBJECT(boton6), "clicked", G_CALLBACK(curva_spline), (gpointer) assistant);

boton7 = gtk_button_new_with_label ("free");

g_signal_connect (G_OBJECT(boton7), "clicked", G_CALLBACK(curva_free), (gpointer) assistant);

gtk_table_attach_defaults (GTK_TABLE (table), curva, 1, 5, 0, 4);

gtk_table_attach_defaults (GTK_TABLE (table), label1, 0, 1, 0, 1);

gtk_table_attach_defaults (GTK_TABLE (table), label2, 0, 1, 3, 4);

gtk_table_attach_defaults (GTK_TABLE (table), label3, 1, 2, 4, 5);

gtk_table_attach_defaults (GTK_TABLE (table), label4, 4, 5, 4, 5);

gtk_table_attach_defaults (GTK_TABLE (table), boton1, 1, 2, 5, 6);

gtk_table_attach_defaults (GTK_TABLE (table), boton2, 2, 3, 5, 6);

gtk_table_attach_defaults (GTK_TABLE (table), boton3, 3, 4, 5, 6);

gtk_table_attach_defaults (GTK_TABLE (table), boton4, 4, 5, 5, 6);

gtk_table_attach_defaults (GTK_TABLE (table), boton5, 1, 2, 6, 7);

gtk_table_attach_defaults (GTK_TABLE (table), boton6, 2, 3, 6, 7);

gtk_table_attach_defaults (GTK_TABLE (table), boton7, 3, 4, 6, 7);

/*static void curva_linear ();

static void curva_spline ();

static void curva_interpolated ();

static void curva_free ();

*/

g_signal_connect (G_OBJECT(assistant), "prepare", G_CALLBACK(create_page4_prepare), (gpointer) assistant);

/*

checkbutton = gtk_check_button_new_with_label ("This is optional data, you may continue even if you do not check this");

gtk_box_pack_start (GTK_BOX (box), checkbutton, FALSE, FALSE, 0);

*/

gtk_widget_show_all (box);

gtk_assistant_append_page (GTK_ASSISTANT (assistant), box);

gtk_assistant_set_page_complete (GTK_ASSISTANT (assistant), box, TRUE);

gtk_assistant_set_page_title (GTK_ASSISTANT (assistant), box, "P\u00E1gina 4: Selecciona fechas");

gtk_assistant_set_page_type (GTK_ASSISTANT (assistant), box, GTK_ASSISTANT_PAGE_CONTENT);

pixbuf = gtk_widget_render_icon (assistant, GTK_STOCK_DIALOG_INFO, GTK_ICON_SIZE_DIALOG, NULL);

gtk_assistan
[cut at 20 KB]

Any sugestions about the curve???[/code]

ramesh · GTK+ Guru Joined: 16 Nov 2006 Posts: 270 Location: INDIA

Hi

can i have complete code.

tadeboro · Posted: Thu Apr 09, 2009 2:16 pm Post subject:

Hello.

GtkCurve widget is considered too specialized to be included in Gtk+ and is not maintained properly (it waits to be added to some 3rd party package).

I'm not sure why would this widget interpolate only first 9 points, but I didn't manage to get it working on my machine at all, so I cannot investigate it further.

And to assist you with writing your display widget, I created simple application that will show you how to create your own graphs using cairo library. I didn't comment it, since I'm really short with spare time, but if you have any questions, post back.

Usage instructons: Clicking on a drawing area will place points there. Shift clicking on a point will remove it. And that's it.

Code: (C)

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#include <gtk/gtk.h>

enum
{
SPLINE_NONE = 0,
SPLINE_LINE,
SPLINE_CATMULL_ROM,
NO_TYPES
};

typedef struct _Data Data;
struct _Data
{
GArray *points;
gboolean visible[NO_TYPES];
gdouble spline_factor;
GtkWidget *draw;
};

static void
cb_value( GtkSpinButton *button,
Data *data )
{
data->spline_factor = gtk_spin_button_get_value( button );
gtk_widget_queue_draw( data->draw );
}

static void
cb_toggled( GtkToggleButton *button,
Data *data )
{
gint index =
GPOINTER_TO_INT( g_object_get_data( G_OBJECT( button ), "type" ) );

data->visible[index] = gtk_toggle_button_get_active( button );

gtk_widget_queue_draw( data->draw );
}

static void
draw_points( cairo_t *cr,
gdouble *coords,
gint size )
{
gint i;

cairo_set_source_rgb( cr, 1, 0, 0 );
for( i = 0; i < size; i += 2 )
{
cairo_move_to( cr, coords[i], coords[i + 1] );
cairo_arc( cr, coords[i], coords[i + 1], 2, 0, 2 * G_PI );
}
cairo_stroke( cr );
}

static void
draw_line( cairo_t *cr,
gdouble *coords,
gint size )
{
gint i;

cairo_set_source_rgb( cr, 0, 0, 1 );
cairo_move_to( cr, coords[0], coords[1] );
for( i = 2; i < size; i += 2 )
{
cairo_line_to( cr, coords[i], coords[i + 1] );
}
cairo_stroke( cr );
}

static void
draw_catmull_rom( cairo_t *cr,
gdouble *coords,
gint size,
double spline_factor )
{
gint i;
gdouble ctrl_points[4];

/* Initial calculations */
ctrl_points[2] = ( coords[2] - coords[0] ) / spline_factor;
ctrl_points[3] = ( coords[3] - coords[1] ) / spline_factor;

cairo_set_source_rgb( cr, 0, 1, 0 );
cairo_move_to( cr, coords[0], coords[1] );
for( i = 2; i < size - 2; i += 2 )
{
ctrl_points[0] = ctrl_points[2];
ctrl_points[1] = ctrl_points[3];
ctrl_points[2] = ( coords[i + 2] - coords[i - 2] ) / spline_factor;
ctrl_points[3] = ( coords[i + 3] - coords[i - 1] ) / spline_factor;

cairo_curve_to( cr, coords[i - 2] + ctrl_points[0],
coords[i - 1] + ctrl_points[1],
coords[i] - ctrl_points[2],
coords[i + 1] - ctrl_points[3],
coords[i],
coords[i + 1] );
}

/* Draw the last segment */
ctrl_points[0] = ctrl_points[2];
ctrl_points[1] = ctrl_points[3];
ctrl_points[2] = ( coords[i] - coords[i - 2] ) / spline_factor;
ctrl_points[3] = ( coords[i + 1] - coords[i - 1] ) / spline_factor;

cairo_curve_to( cr, coords[i - 2] + ctrl_points[0],
coords[i - 1] + ctrl_points[1],
coords[i] - ctrl_points[2],
coords[i + 1] - ctrl_points[3],
coords[i],
coords[i + 1] );

cairo_stroke( cr );
}

static gboolean
cb_expose( GtkWidget *draw,
GdkEventExpose *expose,
Data *data )
{
cairo_t *cr;
gdouble *coords;
gint i;

if( data->points->len == 0 )
return( FALSE );

/* Draw spline */
cr = gdk_cairo_create( draw->window );
cairo_set_line_width( cr, 5 );

coords = (gdouble *)data->points->data;

/* Special case - if only one point is present, draw it no matter what
* spline type is set. */
if( data->points->len == 2 && data->visible[SPLINE_NONE] )
{
draw_points( cr, coords, data->points->len );
cairo_destroy( cr );
return( FALSE );
}

if( data->visible[SPLINE_LINE] )
draw_line( cr, coords, data->points->len );

if( data->visible[SPLINE_CATMULL_ROM] )
draw_catmull_rom( cr, coords, data->points->len, data->spline_factor );

if( data->visible[SPLINE_NONE] )
draw_points( cr, coords, data->points->len );

cairo_destroy( cr );

return( FALSE );
}

static gboolean
cb_press( GtkWidget *draw,
GdkEventButton *event,
Data *data )
{
if( event->state & GDK_SHIFT_MASK )
{
gint i;
gdouble *coords = (gdouble *)data->points->data;

for( i = 0; i < data->points->len - 1; i += 2 )
{
if( event->x > ( coords[i] - 5 ) &&
event->x < ( coords[i] + 5 ) )
{
if( event->y > ( coords[i + 1] - 5 ) &&
event->y < ( coords[i + 1] + 5 ) )
{
g_print( "Delete point at (%f, %f)\n", event->x, event->y );
g_array_remove_range( data->points, i, 2 );
break;
}
}
}
}
else
{
gdouble point[] = { event->x, event->y };

g_print( "Create point at (%f, %f)\n", event->x, event->y );
g_array_append_vals( data->points, (gconstpointer)point, 2 );
}

gtk_widget_queue_draw( draw );

return( TRUE );
}

int
main( int argc,
char **argv )
{
GtkWidget *window;
GtkWidget *hbox;
GtkWidget *vbox, *vbox_main;
GtkWidget *frame;
GtkWidget *button;
GtkWidget *draw;
Data data;

data.points = g_array_sized_new( FALSE, FALSE, sizeof( gdouble ), 10 );
data.spline_factor = 5;
data.visible[0] = TRUE;
data.visible[1] = TRUE;
data.visible[2] = FALSE;

gtk_init( &argc, &argv );

window = gtk_window_new( GTK_WINDOW_TOPLEVEL );
gtk_window_set_default_size( GTK_WINDOW( window ), 400, 300 );
g_signal_connect( G_OBJECT( window ), "destroy",
G_CALLBACK( gtk_main_quit ), NULL );

hbox = gtk_hbox_new( FALSE, 6 );
gtk_container_add( GTK_CONTAINER( window ), hbox );

frame = gtk_frame_new( "Drawing area" );
gtk_box_pack_start( GTK_BOX( hbox ), frame, TRUE, TRUE, 0 );

draw = gtk_drawing_area_new();
data.draw = draw;
gtk_widget_add_events( draw, GDK_BUTTON_PRESS_MASK );
g_signal_connect( G_OBJECT( draw ), "expose-event",
G_CALLBACK( cb_expose ), &data );
g_signal_connect( G_OBJECT( draw ), "button-press-event",
G_CALLBACK( cb_press ), &data );
gtk_container_add( GTK_CONTAINER( frame ), draw );

vbox_main = gtk_vbox_new( FALSE, 6 );
gtk_box_pack_start( GTK_BOX( hbox ), vbox_main, FALSE, FALSE, 0 );

/* Interpolation type */
frame = gtk_frame_new( "Interpolation" );
gtk_box_pack_start( GTK_BOX( vbox_main ), frame, FALSE, FALSE, 0 );

vbox = gtk_vbox_new( TRUE, 6 );
gtk_container_add( GTK_CONTAINER( frame ), vbox );

button = gtk_check_button_new_with_label( "Points" );
gtk_toggle_button_set_active( GTK_TOGGLE_BUTTON( button ), TRUE );
g_object_set_data( G_OBJECT( button ), "type",
GINT_TO_POINTER( SPLINE_NONE ) );
g_signal_connect( G_OBJECT( button ), "toggled",
G_CALLBACK( cb_toggled ), &data );
gtk_box_pack_start( GTK_BOX( vbox ), button, FALSE, FALSE, 0 );

button = gtk_check_button_new_with_label( "Lines" );
gtk_toggle_button_set_active( GTK_TOGGLE_BUTTON( button ), TRUE );
g_object_set_data( G_OBJECT( button ), "type",
GINT_TO_POINTER( SPLINE_LINE ) );
g_signal_connect( G_OBJECT( button ), "toggled",
G_CALLBACK( cb_toggled ), &data );
gtk_box_pack_start( GTK_BOX( vbox ), button, FALSE, FALSE, 0 );

button = gtk_check_button_new_with_label( "Cardinal spline" );
g_object_set_data( G_OBJECT( button ), "type",
GINT_TO_POINTER( SPLINE_CATMULL_ROM ) );
g_signal_connect( G_OBJECT( button ), "toggled",
G_CALLBACK( cb_toggled ), &data );
gtk_box_pack_start( GTK_BOX( vbox ), button, FALSE, FALSE, 0 );

/* Spline factor */
frame = gtk_frame_new( "Cardinal spline factor" );
gtk_box_pack_start( GTK_BOX( vbox_main ), frame, FALSE, FALSE, 0 );

button = gtk_spin_button_new_with_range( 0.1, 100, 0.1 );
gtk_spin_button_set_numeric( GTK_SPIN_BUTTON( button ), TRUE );
gtk_spin_button_set_value( GTK_SPIN_BUTTON( button ), 5. );
g_signal_connect( G_OBJECT( button ), "value-changed",
G_CALLBACK( cb_value ), &data );
gtk_container_add( GTK_CONTAINER( frame ), button );

gtk_widget_show_all( window );

gtk_main();

g_array_free( data.points, TRUE );

return( 0 );
}

psaval · Familiar Face Joined: 20 Feb 2009 Posts: 7

If you want my newest code, just email me to psaval@hotmail.com

And thanks for your code, is impressive, i will make good use of it. Thanks again, i'm gratefull.

P.D.: Sorry for my english, but i'm spanish