diff options
Diffstat (limited to 'navit/graphics.c')
| -rw-r--r-- | navit/graphics.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/navit/graphics.c b/navit/graphics.c index 33c4aef2d..5b2da6e5e 100644 --- a/navit/graphics.c +++ b/navit/graphics.c @@ -630,6 +630,40 @@ static void label_line(struct graphics *gra, struct graphics_gc *fg, struct grap } } +static void display_draw_arrow(struct point *p, int dx, int dy, int l, struct graphics_gc *gc, struct graphics *gra) +{ + struct point pnt[3]; + pnt[0]=pnt[1]=pnt[2]=*p; + pnt[0].x+=-dx*l/65536+dy*l/65536; + pnt[0].y+=-dy*l/65536-dx*l/65536; + pnt[2].x+=-dx*l/65536-dy*l/65536; + pnt[2].y+=-dy*l/65536+dx*l/65536; + gra->meth.draw_lines(gra->priv, gc->priv, pnt, 3); +} + +static void display_draw_arrows(struct displayitem *di, struct graphics_gc *gc, struct graphics *gra) +{ + int i,dx,dy,l; + struct point p; + for (i = 0 ; i < di->count-1 ; i++) { + dx=di->pnt[i+1].x-di->pnt[i].x; + dy=di->pnt[i+1].y-di->pnt[i].y; + l=sqrt(dx*dx+dy*dy); + if (l) { + dx=dx*65536/l; + dy=dy*65536/l; + p=di->pnt[i]; + p.x+=dx*15/65536; + p.y+=dy*15/65536; + display_draw_arrow(&p, dx, dy, 10, gc, gra); + p=di->pnt[i+1]; + p.x-=dx*15/65536; + p.y-=dy*15/65536; + display_draw_arrow(&p, dx, dy, 10, gc, gra); + } + } +} + /** * FIXME * @param <> @@ -721,6 +755,9 @@ static void xdisplay_draw_elements(struct graphics *gra, GHashTable *display_lis else dbg(0,"draw_image_warp not supported by graphics driver drawing '%s'\n", di->label); break; + case element_arrows: + display_draw_arrows(di,gc,gra); + break; default: printf("Unhandled element type %d\n", e->type); |