This is a feature that could have huge impact on trading with other players via private trading, making it less tedious when several different resources are being traded. Especially with guild members or friends who are in need of several resources, this feature would allow to make multi-trades with one single trade offer, rather than sending multiple trade offers.
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Version 1
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Here is a one approach how it could look like:
This version is a rather simple one. It has several select buttons, each of which leading to the resource selection system that we currently have now. I limited the number of selections, but in theory there could be more than 3 different resources selected at the same time. Personally, I think 3/3 is enough, but 4/4, 5/5 or even more could be done as well, depending on how easy it is to code it. After all the resources are selected, it would look like this:
Now the same can be done to select the price the other person has to pay for the selected resources. If one wants to change the selections, the process would be the same as we do it now - simple click on "select" and change type and amount of resource.
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Version 2
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Another approach I would prefer is this one:
Instead of having multiple select buttons on the first panel (that just stays the way it is), we got a "plus" icon in the right corner of the resource selection sub-segment. After selecting the first resource one can click on the "plus" and it will allow to select a second resource, looking like this:
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And if the player wants to add a third resource:
If you decide that you want different resources traded, e.g. steel instead of bronze, just click on the bronze button (bronze 5000) and change the resource. Accept the offer as soon as you are done and it will take you back to the first panel:
Only problem with this one is, that it actually would be limited to three different resources only, since the space for the resource selection sub-segment is limited. One way to work around this would be to make smaller resource buttons in this sub-segment - or a solution I would prefer - make the entire window bigger so more different resources can fit into the sub-segment (max number 10 or whatever makes sense).
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Version 3
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This is actually just another approach for the general trade panel. Instead of having the "end screen" as seen in 1 or 2, a more elegant way would be to make the resources clickable instead of having one button to enter the selection:
Conclusion: I'm not sure if this would violate current trade mechanics or if the code is too difficult or too messed up to actually make this a feature, but imho it would be worth trying it since a multi-trade would make trading less tedious. After all we want to play the game and not waste time with clicking the same buttons several times just to send off 3+ trades to friends![]()