From: Jim Evins <evins@snaught.com>
Date: Sat, 28 Dec 2002 22:59:10 +0000 (+0000)
Subject: No longer attempt to rotate/flip around center of object.  This was very problematic... 
X-Git-Tag: glabels-2_3_0~659
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=dfdf166ca400fd4028dda0248a0be7f19d7383c4;p=glabels

No longer attempt to rotate/flip around center of object.  This was very problematic because the object's affine keeps changing under one's nose.


git-svn-id: https://glabels.svn.sourceforge.net/svnroot/glabels/trunk@228 f5e0f49d-192f-0410-a22d-a8d8700d0965
---

diff --git a/glabels2/src/label-object.c b/glabels2/src/label-object.c
index ebca6552..44920b24 100644
--- a/glabels2/src/label-object.c
+++ b/glabels2/src/label-object.c
@@ -500,7 +500,7 @@ gl_label_object_get_extent (glLabelObject *object,
 	a4.y = h;
 
 	/* transform these points */
-	gl_label_object_get_applied_affine (object, affine);
+	gl_label_object_get_affine (object, affine);
 	art_affine_point (&b1, &a1, affine);
 	art_affine_point (&b2, &a2, affine);
 	art_affine_point (&b3, &a3, affine);
@@ -609,26 +609,40 @@ gl_label_object_get_affine (glLabelObject *object,
 }
 
 /****************************************************************************/
-/* Get applied affine, i.e. translated to center of object and back         */
+/* Get i2w affine, i.e. applied affine + translation.                       */
 /****************************************************************************/
 void
-gl_label_object_get_applied_affine (glLabelObject *object,
-				    gdouble        affine[6])
+gl_label_object_get_i2w_affine (glLabelObject *object,
+				gdouble        affine[6])
 {
-	gdouble w, h;
-	gdouble to_center[6], to_origin[6];
+	gdouble x, y;
+	gdouble translation[6];
 
 	gl_debug (DEBUG_LABEL, "");
 
 	g_return_if_fail (object && GL_IS_LABEL_OBJECT (object));
 
-	gl_label_object_get_size (object, &w, &h);
+	gl_label_object_get_affine (object, affine);
+	gl_label_object_get_position (object, &x, &y);
+
+	art_affine_translate (translation, x, y);
+	art_affine_multiply (affine, affine, translation);
+}
+
+/****************************************************************************/
+/* Get w2i affine, i.e. inverse of applied affine + translation.            */
+/****************************************************************************/
+void
+gl_label_object_get_w2i_affine (glLabelObject *object,
+				gdouble        affine[6])
+{
+	gdouble i2w[6];
+	gl_debug (DEBUG_LABEL, "");
+
+	g_return_if_fail (object && GL_IS_LABEL_OBJECT (object));
 
-	/* setup transformation affine */
-	art_affine_translate (to_center, -w/2.0, -h/2.0);
-	art_affine_multiply (affine, to_center, object->private->affine);
-	art_affine_translate (to_origin, w/2.0, h/2.0);
-	art_affine_multiply (affine, affine, to_origin);
+	gl_label_object_get_i2w_affine (object, i2w);
+	art_affine_invert (affine, i2w);
 }
 
 /****************************************************************************/
diff --git a/glabels2/src/label-object.h b/glabels2/src/label-object.h
index a7703b94..b81f8f45 100644
--- a/glabels2/src/label-object.h
+++ b/glabels2/src/label-object.h
@@ -169,7 +169,10 @@ void           gl_label_object_set_affine            (glLabelObject     *object,
 void           gl_label_object_get_affine            (glLabelObject     *object,
 						      gdouble           affine[6]);
 
-void           gl_label_object_get_applied_affine    (glLabelObject     *object,
+void           gl_label_object_get_i2w_affine        (glLabelObject     *object,
+						      gdouble           affine[6]);
+
+void           gl_label_object_get_w2i_affine        (glLabelObject     *object,
 						      gdouble           affine[6]);
 
 G_END_DECLS
diff --git a/glabels2/src/print.c b/glabels2/src/print.c
index 618782e5..893ab3bc 100644
--- a/glabels2/src/print.c
+++ b/glabels2/src/print.c
@@ -570,7 +570,7 @@ draw_object (PrintInfo     *pi,
 	gl_debug (DEBUG_PRINT, "START");
 
 	gl_label_object_get_position (object, &x0, &y0);
-	gl_label_object_get_applied_affine (object, affine);
+	gl_label_object_get_affine (object, affine);
 
 	gnome_print_gsave (pi->pc);
 
diff --git a/glabels2/src/view-highlight.c b/glabels2/src/view-highlight.c
index 8417a88e..d25b10f8 100644
--- a/glabels2/src/view-highlight.c
+++ b/glabels2/src/view-highlight.c
@@ -262,7 +262,7 @@ gl_view_highlight_new (glViewObject         *view_object,
 	}
 
 
-	gl_label_object_get_applied_affine (view_highlight->private->object, affine);
+	gl_label_object_get_affine (view_highlight->private->object, affine);
 	gnome_canvas_item_affine_absolute (view_highlight->private->group, affine);
 
 	g_signal_connect (G_OBJECT (view_highlight->private->object), "moved",
@@ -684,7 +684,7 @@ flip_rotate_object_cb (glLabelObject    *object,
 	gl_debug (DEBUG_VIEW, "START");
 
 	/* Adjust affine of inner canvas group. */
-	gl_label_object_get_applied_affine (object, affine);
+	gl_label_object_get_affine (object, affine);
 	gnome_canvas_item_affine_absolute (view_highlight->private->group, affine);
 
 	gl_debug (DEBUG_VIEW, "END");
diff --git a/glabels2/src/view-object.c b/glabels2/src/view-object.c
index 540fbfa1..2e9eb073 100644
--- a/glabels2/src/view-object.c
+++ b/glabels2/src/view-object.c
@@ -327,7 +327,7 @@ gl_view_object_item_new (glViewObject *view_object,
         gnome_canvas_item_set_valist (item, first_arg_name, args);
         va_end (args);
 
-	gl_label_object_get_applied_affine (view_object->private->object, affine);
+	gl_label_object_get_affine (view_object->private->object, affine);
 
 	/* Apply a very small rotation, fixes problems with flipped or rotated images */
 	art_affine_rotate (delta_affine, DELTA_DEG);
@@ -467,7 +467,7 @@ flip_rotate_object_cb (glLabelObject *object,
 
 	gl_debug (DEBUG_VIEW, "START");
 
-	gl_label_object_get_applied_affine (object, affine);
+	gl_label_object_get_affine (object, affine);
 
 	/* Apply a very small rotation, fixes problems with flipped or rotated images */
 	art_affine_rotate (delta_affine, DELTA_DEG);