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This guide explains how to implement shop headers on maps. |
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There are 5 headers related to shops that can be present in a map. Any given map may have some, all or none of them (although in the later case, it isn't considered to be a shop). |
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The headers are. |
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shopitems. |
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this is a semi-colon deliminated list of item types and values. |
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each entry is a name of an item type (from the array in common/item.c) |
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followed by an optional colon then a value in the range -100 to 100. |
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(if this is missing, the default value of 0 is used. |
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This value is a measure of how much items of that type are preffered. |
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Neutrality is represented by 0 (so a theoretical 'general' store would |
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have 0 for everything), a positive preference for certain item types |
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is a positive value, and negative preference for item types is a negative value. |
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As a special note, the character * may be used once to set a preference for |
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everything not explicitly listed otherwise (this value would in most cases be negative) |
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for example, a typical magic shop might have the string: |
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shopitems amulet:25;ring:40;potion:40;book:35;scroll:40;spellbook:40;skillscroll:50;wand:40;*:-50 |
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and an armour shop might have the string: |
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shopitems armour:50;shield:50;helmet:40;cloak:40;boots:40;gloves:40;bracers:50;girdle:50;*:-50 |
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all possible name values for items are listed in common/item.c, however there are only some |
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that are likely to be used (doors are not sold very often....) this list is not definitive or |
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neccesarily up-to-date, but is a reasonable starting point for constructing a new shop. |
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rod |
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book |
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horn |
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amulet |
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potion |
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ring |
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inorganic |
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spellbook |
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wand |
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scroll |
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power_crystal |
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arrow |
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bow |
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weapon |
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armour |
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shield |
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helmet |
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cloak |
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boots |
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gloves |
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bracers |
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girdle |
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flesh |
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food |
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drink |
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treasure |
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gem |
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skill tool |
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lighter |
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light source |
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lamp |
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tool |
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container |
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item_transformer |
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armour improver |
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weapon improver |
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skillscroll |
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building material |
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shopmin |
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This is an integer value. It is the minimum value that the object must have in |
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order to be considered by purchase for a shop. This is not the same as the price |
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offered, which can be substantially below shopmin. |
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shopmax |
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This is an integer value. It uses value like shopmin does, however it is not a |
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fixed upper limit. |
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The value is adjusted downwards if it is in excess of one half of shopmax. The |
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output value is the minimum of shopmax and one half of shopmax plus the square root |
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of one half of shopmax |
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Note that the value is only an aspect of the final price, and the actual price offered for an item |
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can be substantially less than shopmax, even when the item's value in in excess of that. |
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shoprace |
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if the player matches shoprace, this has no effect, if they do not, the price offered |
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is only 80% of what it would otherwise be. |
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shopgreed |
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This is a multiplier on all prices offered, items brought from the player are done |
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so at a price divided by the greed, items sold to a player are overcharged by a factor of shopgreed. |
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Recognising different types of shops: |
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Whilst a hit and miss approach will work if there are items of known value to measure |
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prices with, it is possible to also guage the manner in which a shop will trade with |
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the bargaining skill. Merely use_skill bargaining on an appropriate shop, and the |
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details about the shop will be displayed. |
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Value estimation: |
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no longer does examining an item display the exact sale price you will get (not least |
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because there /is/ no exact sale price anymore...). Instead an estimate is given, the |
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quality of this estimate is based on your knowledge of any skills that could identify |
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the item, and the bargaining skill, as well as a fair degree of luck. Remember, just |
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because you think an item is worth a lot, doesn't mean any shopkeepers do. |
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The estimate given can be improved by leveling skills related to the class of item in question, |
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and the bargaining skill. Also, by acquiring other objects that are similar, and comparing and |
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merging them, your evaluation of the value of the objects can change. This does not always mean |
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greater accuracy however. |
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