GTK+プログラミング
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <cairo.h>
#define BITMAP_WIDTH (600)
#define BITMAP_HEIGHT (600)
GtkWidget *window;
GtkWidget *darea;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *button01;
GThread* thread;
volatile int execflag01;
int count;
int time_count;
static void do_drawing (cairo_t *, GtkWidget * widget);
struct
{
cairo_surface_t *image;
} glob;
static gboolean on_draw_event (GtkWidget * widget, cairo_t * cr, gpointer user_data)
{
cr = gdk_cairo_create (gtk_widget_get_window (widget));
do_drawing (cr, widget);
cairo_destroy (cr);
return FALSE;
} 続き
static void do_drawing (cairo_t * cr, GtkWidget * widget)
{
gfloat screen_width;
gfloat screen_height;
gfloat image_width;
gfloat image_height;
gfloat x_scaling;
gfloat y_scaling;
/* ディスプレイの全画面の大きさを取得 */
screen_width = gdk_screen_get_width (gdk_screen_get_default ());
screen_height = gdk_screen_get_height (gdk_screen_get_default ());
/* イメージの大きさを取得 */
image_width = cairo_image_surface_get_width (glob.image);
image_height = cairo_image_surface_get_height (glob.image);
x_scaling = 1.0;
y_scaling = 1.0;
cairo_scale (cr, x_scaling, y_scaling);
cairo_set_source_surface (cr, glob.image, 0, 0);
cairo_paint (cr);
} 続き
static void load_image ()
{
cairo_t *ic;
glob.image = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, BITMAP_WIDTH, BITMAP_HEIGHT);
ic = cairo_create (glob.image);
//長方形の描画
{
//色の指定(外枠：Red,Green,Blue)
cairo_set_source_rgb(ic, 0.0, 0.0, 1.0);
//長方形（x,y,width,height）を描画
cairo_rectangle(ic, 0.0, 0.0, BITMAP_WIDTH, BITMAP_HEIGHT);
//長方形の外枠を作る
cairo_stroke_preserve(ic);
//色を指定(塗りつぶし：Red,Green,Blue)
cairo_set_source_rgb(ic, 0.0, 0.0, 1.0);
//長方形を塗りつぶす
cairo_fill(ic);
cairo_stroke (ic);
}
cairo_destroy (ic);
} 続き
static gpointer thread_func( gpointer data){
cairo_t *ic;
int i;
ic = cairo_create (glob.image);
{
cairo_set_source_rgb(ic, 0.0, 0.0, 1.0);
cairo_rectangle(ic, 0.0, 0.0, BITMAP_WIDTH, BITMAP_HEIGHT);
cairo_stroke_preserve(ic);
cairo_set_source_rgb(ic, 0.0, 0.0, 1.0);
cairo_fill(ic);
}
cairo_stroke (ic);
for (i = 0; i < count; i++) {
gdk_threads_enter();
{
cairo_set_source_rgb(ic, (i % 256) / 256.0, 0.0, (i % 256) / 256.0);
cairo_rectangle(ic, 0.0, (double)i, (double)BITMAP_WIDTH, 1.0);
cairo_stroke (ic);
}
gdk_threads_leave();
gtk_widget_queue_draw(darea);
usleep(time_count);
}
cairo_destroy (ic);
execflag01 = 0;
} 続き
static void on_button01_clicked(GtkWidget *button, gpointer user_data){
GError *error;
if (execflag01 == 0) {
execflag01 = 1;
count = BITMAP_HEIGHT;
time_count = 1000;
thread = g_thread_create( thread_func, (gpointer)darea, FALSE, &error);
}
} 最後
int main (int argc, char *argv[])
{
load_image ();
execflag01 = 0;
gtk_init (&argc, &argv);
gdk_threads_init();
gdk_threads_enter();
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_container_set_border_width(GTK_CONTAINER(window), 5);
vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 5);
gtk_container_add(GTK_CONTAINER(window), vbox);
darea = gtk_drawing_area_new ();
gtk_box_pack_start(GTK_BOX(vbox), darea, FALSE, FALSE, 0);
gtk_widget_set_size_request(darea, BITMAP_WIDTH, BITMAP_HEIGHT);
button01 = gtk_button_new_with_label("Button01");
gtk_box_pack_start(GTK_BOX(vbox), button01, FALSE, FALSE, 0);
g_signal_connect(G_OBJECT(button01), "clicked", G_CALLBACK(on_button01_clicked), NULL);
g_signal_connect (G_OBJECT (darea), "draw", G_CALLBACK (on_draw_event), NULL);
g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
gtk_window_set_position (GTK_WINDOW (window), GTK_WIN_POS_CENTER);
gtk_window_set_title (GTK_WINDOW (window), "Cairo Test");
gtk_window_set_decorated (GTK_WINDOW (window), TRUE);
gtk_widget_set_size_request(window, 600, 630);
gtk_widget_show_all (window);
gtk_main ();
gdk_threads_leave();
cairo_surface_destroy (glob.image);
return 0;
} 
