The entry point for calculating the rate of damage per tick is
Block.getPlayerRelativeBlockHardness()
By default, this performs the following sequence of calculations for ordinary Items:
1. Block.getBlockHardness()
- The block hardness is usually set when constructing the block, using .setHardness() or .setUnbreakable(). Typical values are 0.5 for dirt up to 2000 for obsidian.
- If <0, the block is invulnerable so return 0.0, otherwise:
2. Calculates the digging speed (damage per tick, where 1.0 =
100% damage) and returns it to the caller:
2a. ForgeHooks.canHarvestBlock returns true if the given tool
can harvest the given block:
- If the block material doesn’t require a tool, return true
- If the Block.getHarvestTool() has a particular ToolClass, the Item has a matching ToolClass, and the harvest level of the Item is >= the Block harvest level, then return true.
- Otherwise, raise PlayerEvent.HarvestCheck event to decide (defaults to false).
2b player.getBreakSpeed() is calculated by multiplying the following numbers together:
- If the player isn’t holding an item, the base speed is 1.0, otherwise the base digging speed is calculated from block and item using Item.getDigSpeed() below
- Speed multipliers based on item enchantments and potions
- Speed slowdowns based on potions, mining underwater or while falling
- Modification by the PlayerEvent.BreakSpeed event (if reduced to below zero, does no damage at all).
2b1 Item.getDigSpeed():
- This function returns a number from 1 (no modification) to EfficiencyOnProperMaterial, which is a speedup factor based on the material the tool is made of (eg Wood, Iron) – see Item.ToolMaterial. Ranges from 2.0 for Wood to 12.0 for gold.
- If the Item is an ItemTool and Block.isToolEffective(ToolClass) returns true for any of the Item’s ToolClasses (which by default checks whether the ToolClass matches Block.getHarvestTool()), it returns EfficiencyOnProperMaterial.
- Otherwise, it calls Item.getStrVsBlock() to get the speedup factor.
2b2 Item.getStrVsBlock():
- For ordinary items, returns 1.0.
- For ItemTools, it looks in the set of effective blocks, which was provided in the ItemTool constructor. If any match, it returns EfficiencyOnProperMaterial. Otherwise 1.0.
- ItemPickAxe, ItemSword and similar have some special cases as well.
Further Links
~Mining Blocks With Tools
Logic flow of vanilla block mining code
Calculating rate of damage when mining
Logic flow of vanilla block mining code
Calculating rate of damage when mining
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