static void encode (struct latlon_double *lls, int n) {
polyline_begin ();
for (int i = 0; i < n; ++i) {
polyline_point (lls[i].lat, lls[i].lon);
}
}
void
polyline_do_action(VALUE points, texture_info * tex, VALUE hash_arg,
texplay_sync sync_mode, bool primary, action_struct * payload)
{
int x1, y1, x2, y2;
int format;
int num_point_pairs;
int k;
int draw_offset_y, draw_offset_x;
action_struct cur;
VALUE offset_val;
bool closed = false;
draw_prologue(&cur, tex, XMAX_OOB, YMAX_OOB, XMIN_OOB, YMIN_OOB, &hash_arg, sync_mode, primary, &payload);
/* calculate offset */
offset_val = get_image_local(tex->image, DRAW_OFFSET);
draw_offset_x = NUM2INT(get_from_array(offset_val, 0));
draw_offset_y = NUM2INT(get_from_array(offset_val, 1));
/* if the polyline is 'closed' make the last point the first */
if(is_a_hash(hash_arg))
if(RTEST(get_from_hash(hash_arg, "closed")) || RTEST(get_from_hash(hash_arg, "close"))) {
/* so that our additional point is not persistent */
points = rb_obj_dup(points);
closed = true;
}
/* determine format of points */
if(is_a_point(get_from_array(points, 0))) {
format = POINT_FORMAT;
/* if the polyline is closed to form a polygon then make the last point and first point identical */
if(closed)
rb_ary_push(points, get_from_array(points, 0));
num_point_pairs = RARRAY_LEN(points);
}
else {
format = SIMPLE_FORMAT;
/* ensure there is an 'x' for every 'y' */
if(RARRAY_LEN(points) % 2)
rb_raise(rb_eArgError, "polyline needs an even number of points. got %d\n",
(int)RARRAY_LEN(points));
if(closed) {
rb_ary_push(points, get_from_array(points, 0));
rb_ary_push(points, get_from_array(points, 1));
}
num_point_pairs = RARRAY_LEN(points) / 2;
}
/* calculate first point */
polyline_point(points, 0, &x1, &y1, format, draw_offset_x, draw_offset_y);
/* calc the points and draw the polyline */
for(k = 1; k < num_point_pairs; k++) {
polyline_point(points, k, &x2, &y2, format, draw_offset_x, draw_offset_y);
line_do_action(x1, y1, x2, y2, tex, hash_arg, no_sync, false, payload);
/* update drawing rectangle */
update_bounds(payload, x1, y1, x2, y2);
x1 = x2; y1 = y2;
}
draw_epilogue(&cur, tex, primary);
}
