feature: graphics: allow spiked lines for cliff and embarkments (#1174)

* feature: graphics: allow spiked lines for cliff and embarkments

This adds another drwing element to graphics system. It can produce
lines with spikes as used for cliffs on maps.

Additionally this adds embarlment support for map.

* review fixes.

Add changes requested by review, plus add paranoia check on xml
parameter.

1 files changed, 33 insertions, 0 deletions

diff --git a/navit/layout.c b/navit/layout.c
index 0889fb52b..2300ab68d 100644
--- a/navit/layout.c
+++ b/navit/layout.c
@@ -399,6 +399,7 @@ int itemgra_add_attr(struct itemgra *itemgra, struct attr *attr) {
     case attr_icon:
     case attr_image:
     case attr_arrows:
+    case attr_spikes:
         itemgra->elements = g_list_append(itemgra->elements, attr->u.element);
         return 1;
     default:
@@ -446,6 +447,27 @@ static void element_set_arrows_width(struct element *e, struct attr **attrs) {
         e->u.arrows.width=10;
 }
 
+static void element_set_spikes_width(struct element *e, struct attr **attrs) {
+    struct attr *width;
+    width=attr_search(attrs, attr_width);
+    if (width)
+        e->u.spikes.width=width->u.num;
+    else
+        e->u.spikes.width=10;
+}
+
+static void element_set_spikes_distance(struct element *e, struct attr **attrs) {
+    struct attr *distance;
+    distance=attr_search(attrs, attr_distance);
+    if (distance) {
+        e->u.spikes.distance=distance->u.num;
+        /* paranoia check. We divide with that value */
+        if(e->u.spikes.distance < 1)
+            e->u.spikes.distance = 1;
+    } else
+        e->u.spikes.distance=10;
+}
+
 static void element_set_polyline_width(struct element *e, struct attr **attrs) {
     struct attr *width;
     width=attr_search(attrs, attr_width);
@@ -651,6 +673,17 @@ arrows_new(struct attr *parent, struct attr **attrs) {
     return (struct arrows *)e;
 }
 
+struct spikes *
+spikes_new(struct attr *parent, struct attr **attrs) {
+    struct element *e;
+    e = g_malloc0(sizeof(*e));
+    e->type=element_spikes;
+    element_set_color(e, attrs);
+    element_set_spikes_width(e, attrs);
+    element_set_spikes_distance(e, attrs);
+    return (struct spikes *)e;
+}
+
 int element_add_attr(struct element *e, struct attr *attr) {
     switch (attr->type) {
     case attr_coord: