/**
* Converts all trains to the new subtype format introduced in savegame 16.2
* It also links multiheaded engines or make them forget they are multiheaded if no suitable partner is found
*/
void ConvertOldMultiheadToNew()
{
Train *t;
FOR_ALL_TRAINS(t) SetBit(t->subtype, 7); // indicates that it's the old format and needs to be converted in the next loop
FOR_ALL_TRAINS(t) {
if (HasBit(t->subtype, 7) && ((t->subtype & ~0x80) == 0 || (t->subtype & ~0x80) == 4)) {
for (Train *u = t; u != NULL; u = u->Next()) {
const RailVehicleInfo *rvi = RailVehInfo(u->engine_type);
ClrBit(u->subtype, 7);
switch (u->subtype) {
case 0: // TS_Front_Engine
if (rvi->railveh_type == RAILVEH_MULTIHEAD) u->SetMultiheaded();
u->SetFrontEngine();
u->SetEngine();
break;
case 1: // TS_Artic_Part
u->subtype = 0;
u->SetArticulatedPart();
break;
case 2: // TS_Not_First
u->subtype = 0;
if (rvi->railveh_type == RAILVEH_WAGON) {
/* normal wagon */
u->SetWagon();
break;
}
if (rvi->railveh_type == RAILVEH_MULTIHEAD && rvi->image_index == u->spritenum - 1) {
/* rear end of a multiheaded engine */
u->SetMultiheaded();
break;
}
if (rvi->railveh_type == RAILVEH_MULTIHEAD) u->SetMultiheaded();
u->SetEngine();
break;
case 4: // TS_Free_Car
u->subtype = 0;
u->SetWagon();
u->SetFreeWagon();
break;
default: NOT_REACHED();
}
}
}
}
}
/**
* Highlight the position where a rail vehicle is dragged over by drawing a light gray background.
* @param px The current x position to draw from.
* @param max_width The maximum space available to draw.
* @param selection Selected vehicle that is dragged.
* @param chain Whether a whole chain is dragged.
* @return The width of the highlight mark.
*/
static int HighlightDragPosition(int px, int max_width, VehicleID selection, bool chain)
{
bool rtl = _current_text_dir == TD_RTL;
assert(selection != INVALID_VEHICLE);
int dragged_width = WD_FRAMERECT_LEFT + WD_FRAMERECT_RIGHT;
for (Train *t = Train::Get(selection); t != NULL; t = chain ? t->Next() : (t->HasArticulatedPart() ? t->GetNextArticulatedPart() : NULL)) {
dragged_width += t->GetDisplayImageWidth(NULL);
}
int drag_hlight_left = rtl ? max(px -dragged_width, 0) : px;
int drag_hlight_right = rtl ? px : min(px + dragged_width, max_width);
int drag_hlight_width = max(drag_hlight_right - drag_hlight_left, 0);
if (drag_hlight_width > 0) {
GfxFillRect(drag_hlight_left + WD_FRAMERECT_LEFT, WD_FRAMERECT_TOP + 1,
drag_hlight_right - WD_FRAMERECT_RIGHT, ScaleGUITrad(13) - WD_FRAMERECT_BOTTOM, _colour_gradient[COLOUR_GREY][7]);
}
return drag_hlight_width;
}