Tilemaps can now load their own physics engines from map properties. The gravity for the arcade simulation is acting a little funny when populated from the map properties.

src/json_helpers.c

@@ -52,6 +52,17 @@ akerr_ErrorContext *akgl_get_json_number_value(json_t *obj, char *key, float *de
   SUCCEED_RETURN(errctx);
 }
 
+akerr_ErrorContext AKERR_NOIGNORE *akgl_get_json_double_value(json_t *obj, char *key, double *dest)
+{
+  PREPARE_ERROR(errctx);
+  FAIL_ZERO_RETURN(errctx, obj, AKERR_NULLPOINTER, "NULL pointer reference");
+  json_t *value = json_object_get(obj, key);
+  FAIL_ZERO_RETURN(errctx, value, AKERR_KEY, "Key %s not found in object", key);
+  FAIL_ZERO_RETURN(errctx, (json_is_number(value)), AKERR_TYPE, "Key %s in object has incorrect type", key);
+  *dest = json_number_value(value);
+  SUCCEED_RETURN(errctx);
+}
+
 akerr_ErrorContext *akgl_get_json_string_value(json_t *obj, char *key, akgl_String **dest)
 {
   json_t *value = NULL;
@@ -129,3 +140,26 @@ akerr_ErrorContext *akgl_get_json_array_index_string(json_t *array, int index, a
   strncpy((char *)&(*dest)->data, json_string_value(value), AKGL_MAX_STRING_LENGTH);
   SUCCEED_RETURN(errctx);
 }
+
+akerr_ErrorContext AKERR_NOIGNORE *akgl_get_json_with_default(akerr_ErrorContext *err, void *defval, void *dest, uint32_t defsize)
+{
+    PREPARE_ERROR(e);
+    if ( err == NULL ) {
+	SUCCEED_RETURN(e);
+    }
+    int docopy = 0;
+    
+    FAIL_ZERO_RETURN(e, err, AKERR_NULLPOINTER, "err");
+    FAIL_ZERO_RETURN(e, defval, AKERR_NULLPOINTER, "defval");
+    FAIL_ZERO_RETURN(e, dest, AKERR_NULLPOINTER, "dest");
+		     
+    ATTEMPT {
+    } CLEANUP {
+    } PROCESS(err) {
+    } HANDLE_GROUP(err, AKERR_KEY) {
+    } HANDLE_GROUP(err, AKERR_INDEX) {
+	memcpy(dest, defval, defsize);
+    } FINISH(err, true);
+    
+    SUCCEED_RETURN(e);
+}