Fix #10946: On-ride photo profit assumes every guest buys one (#12285)

* Use stored values of customers to adjust income from on-ride photos

Use stored values of photos sold and total customers to calculate ratio
and use that to predict income per hour for rides that include
on-ride-photo sections.

* Get rid of float

* Fix formatting

* Fix formatting - again

* Review changes

* Fix formatting

* Use new method of checking on-ride photo

* Use constants

* Add a changelog and contributors entry

contributors.md

@@ -147,6 +147,7 @@ The following people are not part of the development team, but have been contrib
 * Michael Coates (outerwear)
 * Reid Baris (Rdbaris)
 * Deanna Baris (dbaris)
+* Chaitanya Thengdi (chaitanyathengdi)
 
 ## Toolchain
 * (Balletie) - macOS

distribution/changelog.txt

@@ -48,6 +48,7 @@
 - Fix: [#12123] Long server descriptions are not cut off properly.
 - Fix: [#12211] Map Generator shows incorrect map sizes (e.g. "150 x 0").
 - Fix: [#12221] Map Generation tool doesn't place any trees.
+- Fix: [#12285] On-ride photo profit assumes every guest buys one.
 - Fix: [#12312] Softlock when loading save file via command line fails.
 - Fix: RCT1 scenarios have more items in the object list than are present in the park or the research list.
 - Improved: [#6530] Allow water and land height changes on park borders.

src/openrct2/ride/Ride.cpp

@@ -396,8 +396,24 @@ money32 Ride::CalculateIncomePerHour() const
 
     if (currentShopItem != SHOP_ITEM_NONE)
     {
-        priceMinusCost += price[1];
+        const money16 shopItemProfit = price[1] - ShopItems[currentShopItem].Cost;
-        priceMinusCost -= ShopItems[currentShopItem].Cost;
+
+        if (ShopItems[currentShopItem].IsPhoto())
+        {
+            const int32_t rideTicketsSold = total_customers - no_secondary_items_sold;
+
+            // Use the ratio between photo sold and total admissions to approximate the photo income(as not every guest will buy
+            // one).
+            // TODO: use data from the last 5 minutes instead of all-time values for a more accurate calculation
+            if (rideTicketsSold > 0)
+            {
+                priceMinusCost += ((no_secondary_items_sold * shopItemProfit) / rideTicketsSold);
+            }
+        }
+        else
+        {
+            priceMinusCost += shopItemProfit;
+        }
 
         if (entry->shop_item[0] != SHOP_ITEM_NONE)
             priceMinusCost /= 2;