From e3bb24569b85ff5fea4dcc3eb10e86ae59608967 Mon Sep 17 00:00:00 2001
From: lecoanet
Date: Wed, 3 Mar 2004 10:16:24 +0000
Subject: Changes to implement a new behavior for -position attribute and local
 transforms.

---
 generic/Item.c | 50 ++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 40 insertions(+), 10 deletions(-)

(limited to 'generic/Item.c')

diff --git a/generic/Item.c b/generic/Item.c
index 5935917..ae71348 100644
--- a/generic/Item.c
+++ b/generic/Item.c
@@ -1766,16 +1766,18 @@ QueryItem(ZnItem		item,
  */
 static void
 ComposeTransform(ZnTransfo	*transfo,
+		 ZnPoint	*pos,
 		 ZnTransfo	*current_t,
 		 ZnTransfo	*new_t,
 		 ZnBool		compose_scale,
 		 ZnBool		compose_rot)
 {
   ZnBool	full;
+  ZnTransfo	t, t2;
 
   full = compose_scale && compose_rot;
   
-  if (!transfo && full) {
+  if (!transfo && !pos && full) {
     *new_t = *current_t;
     return;
   }
@@ -1784,20 +1786,40 @@ ComposeTransform(ZnTransfo	*transfo,
      * Full concatenation.
      */
     /*ZnPrintTransfo(transfo);*/
-    ZnTransfoCompose(new_t, transfo, current_t);
+    if (pos) {
+      if (!transfo) {
+	ZnTransfoSetIdentity(&t);
+      }
+      else {
+	t = *transfo;
+      }
+      ZnTranslate(&t, pos->x, pos->y);
+      ZnTransfoCompose(new_t, &t, current_t);
+    }
+    else {
+      ZnTransfoCompose(new_t, transfo, current_t);
+    }
   }
   else {
-    ZnPoint	scale, trans, local_scale, local_trans, p, p2;
+    ZnPoint	scale, trans, local_scale, local_trans, p;
     ZnReal	local_rot, rot;
-    ZnTransfo	t, t2;
     
     ZnTransfoSetIdentity(new_t);
     ZnTransfoDecompose(transfo, &local_scale, &local_trans, &local_rot, NULL);
     ZnScale(new_t, local_scale.x, local_scale.y);
     ZnRotateRad(new_t, local_rot);
+
     ZnTransfoDecompose(current_t, &scale, &trans, &rot, NULL);
 
-    ZnTransformPoint(current_t, &local_trans, &p2);
+    if (pos) {
+      ZnTransfoSetIdentity(&t);
+      ZnTranslate(&t, pos->x, pos->y);
+      ZnTransfoCompose(&t2, &t, current_t);
+      ZnTransformPoint(&t2, &local_trans, &p);
+    }
+    else {
+      ZnTransformPoint(current_t, &local_trans, &p);
+    }
 
     if (compose_scale) {
       ZnScale(new_t, scale.x, scale.y);
@@ -1805,7 +1827,7 @@ ComposeTransform(ZnTransfo	*transfo,
     if (compose_rot) {
       ZnRotateRad(new_t, rot);
     }
-    ZnTranslate(new_t, p2.x, p2.y);
+    ZnTranslate(new_t, p.x, p.y);
   }
 }
 
@@ -1822,10 +1844,11 @@ static void
 GetItemTransform(ZnItem		item,
 		 ZnTransfo	*t)
 {
-  ZnItem		*items;
+  ZnItem	*items;
   int		i;
   ZnTransfo	t_tmp, *t1, *t2, *swap;
-  
+  ZnPoint	*pos = NULL;
+
   if (item_stack == NULL) {
     item_stack = ZnListNew(16, sizeof(ZnItem));
   }
@@ -1843,7 +1866,13 @@ GetItemTransform(ZnItem		item,
   t2 = &t_tmp;
   items = (ZnItem *) ZnListArray(item_stack);
   for (i = ZnListSize(item_stack)-1; i >= 0; i--) {
-    ComposeTransform(items[i]->transfo, t1, t2,
+    if (items[i]->class->pos_offset >= 0) {
+      pos = ((void *) items[i]) + items[i]->class->pos_offset;
+      if (pos->x == 0 && pos->y == 0) {
+	pos = NULL;
+      }
+    }
+    ComposeTransform(items[i]->transfo, pos, t1, t2,
 		     ISSET(items[i]->flags, ZN_COMPOSE_SCALE_BIT),
 		     ISSET(items[i]->flags, ZN_COMPOSE_ROTATION_BIT));
     swap = t2;
@@ -1893,6 +1922,7 @@ ZnFreeTransformStack(ZnWInfo	*wi)
 void
 ZnPushTransform(ZnWInfo		*wi,
 		ZnTransfo	*transfo,
+		ZnPoint		*pos,
 		ZnBool		compose_scale,
 		ZnBool		compose_rot)
 {
@@ -1907,7 +1937,7 @@ ZnPushTransform(ZnWInfo		*wi,
   num_t = ZnListSize(wi->transfo_stack);
   ZnListAssertSize(wi->transfo_stack, num_t+1);
   next_t = (ZnTransfo *) ZnListAt(wi->transfo_stack, num_t);
-  ComposeTransform(transfo, wi->current_transfo, next_t,
+  ComposeTransform(transfo, pos, wi->current_transfo, next_t,
 		   compose_scale, compose_rot);
   wi->current_transfo = next_t;
 }
-- 
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