Generate outline

1 files changed, 104 insertions, 14 deletions

diff --git a/region_to_path.c b/region_to_path.c
index 0b8a1ae..437bd08 100644
--- a/region_to_path.c
+++ b/region_to_path.c
@@ -3,16 +3,16 @@
 #include <cairo.h>
 
 static const cairo_rectangle_int_t rects[] = {
-    { 0, 10, 40, 20 },
-    { 50, 0, 40, 20 },
-    { 100, 0, 10, 70 },
-    { 80, 20, 10, 20 },
-    { 20, 30, 10, 10 },
-    { 10, 40, 30, 30 },
-    { 0, 60, 10, 10 },
-    { 40, 50, 20, 20 },
-    { 50, 30, 20, 20 },
-    { 70, 40, 20, 30 },
+    { 0, 100, 400, 200 },
+    { 500, 00, 400, 200 },
+    { 1000, 00, 100, 700 },
+    { 800, 200, 100, 200 },
+    { 200, 300, 100, 100 },
+    { 100, 400, 300, 300 },
+    { 00, 600, 100, 100 },
+    { 400, 500, 200, 200 },
+    { 500, 300, 200, 200 },
+    { 700, 400, 200, 300 },
 };
 
 typedef struct hsegment_t hsegment_t;
@@ -107,6 +107,72 @@ compare_vsegments (gconstpointer p1, gconstpointer p2)
     }
 }
 
+static void add_hsegment (cairo_t *cr, hsegment_t *h, gboolean go_right);
+
+static void
+add_vsegment (cairo_t *cr, vsegment_t *v, gboolean go_down)
+{
+    hsegment_t *h;
+    gboolean go_right;
+    
+    if (!v->bottom)
+	return;
+
+    if (go_down)
+    {
+	cairo_line_to (cr, v->x, v->y2);
+
+	h = v->bottom;
+    }
+    else
+    {
+	cairo_line_to (cr, v->x, v->y1);
+
+	h = v->top;
+    }
+
+    if (h->left == v)
+	go_right = TRUE;
+    else
+	go_right = FALSE;
+
+    v->top = v->bottom = NULL;
+
+    add_hsegment (cr, h, go_right);
+}
+
+static void
+add_hsegment (cairo_t *cr, hsegment_t *h, gboolean go_right)
+{
+    vsegment_t *v;
+    gboolean go_down;
+
+    if (!h->left)
+	return;
+    
+    if (go_right)
+    {
+	cairo_line_to (cr, h->x2, h->y);
+
+	v = h->right;
+    }
+    else
+    {
+	cairo_line_to (cr, h->x1, h->y);
+
+	v = h->left;
+    }
+
+    if (v->top == h)
+	go_down = TRUE;
+    else
+	go_down = FALSE;
+
+    h->left = h->right = NULL;
+    
+    add_vsegment (cr, v, go_down);
+}
+
 static void
 region_to_path (cairo_t *cr, cairo_region_t *region)
 {
@@ -328,18 +394,31 @@ region_to_path (cairo_t *cr, cairo_region_t *region)
     
     if (cr)
     {
+	for (i = 0; i < hsegments->len; ++i)
+	{
+	    hsegment_t *h = &g_array_index (hsegments, hsegment_t, i);
+	    
+	    if (h->left)
+	    {
+		cairo_move_to (cr, h->x1, h->y);
+		add_hsegment (cr, h, TRUE);
+	    }
+	}
     }
     
+    g_array_free (hsegments, TRUE);
+    g_array_free (vsegments, TRUE);
 }
 
 static gboolean
 on_expose (GtkWidget *widget, GdkEvent *event, gpointer data)
 {
     cairo_t *cr;
-    
+
     if (GTK_WIDGET_DRAWABLE (widget))
     {
 	cairo_region_t *region;
+	cairo_rectangle_int_t rect;
 	int i;
 	
 	region = cairo_region_create();
@@ -348,6 +427,15 @@ on_expose (GtkWidget *widget, GdkEvent *event, gpointer data)
 	    cairo_region_union_rectangle (region, &rects[i]);
 	
 	cr = gdk_cairo_create (widget->window);
+
+#if 0
+	cairo_region_get_extents (region, &rect);
+	cairo_rectangle (cr, rect.x, rect.y, rect.width + 100, rect.height + 100);
+	cairo_set_source_rgba (cr, 0, 0, 1, 1);
+	cairo_fill (cr);
+#endif
+
+	cairo_region_translate (region, 50, 50);
 	
 	region_to_path (cr, region);
 
@@ -355,11 +443,13 @@ on_expose (GtkWidget *widget, GdkEvent *event, gpointer data)
 
 	cairo_fill_preserve (cr);
 
-	cairo_set_source_rgba (cr, 0.2, 0.8, 0.2, 1.0);
+	cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 1.0);
 
 	cairo_stroke (cr);
 
 	cairo_destroy (cr);
+
+	cairo_region_destroy (region);
     }
 
     return TRUE;
@@ -374,9 +464,9 @@ main (int argc, char **argv)
 
     window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
 
-    g_signal_connect (window, "expose_event", G_CALLBACK (on_expose), NULL);
+    gtk_window_set_default_size (window, 1200, 768);
 
-    gtk_window_set_default_size (window, 1024, 768);
+    g_signal_connect (window, "expose_event", G_CALLBACK (on_expose), NULL);
 
     gtk_widget_show_all (window);