[Abilities] Added abilities to monsters

Monsters can now either receive abilities at lifetime via scripts, or
via the <ability> node in the monsters node.

1 files changed, 97 insertions, 0 deletions

diff --git a/example/scripts/monster/basic_ai.lua b/example/scripts/monster/basic_ai.lua
new file mode 100644
index 0000000..9c35f42
--- /dev/null
+++ b/example/scripts/monster/basic_ai.lua
@@ -0,0 +1,97 @@
+--[[
+
+ Basic stroll ai
+
+--]]
+
+local STROLL_TIMEOUT = 20
+local STROLL_TIMEOUT_RANDOMNESS = 10
+
+-- Wrapping the monster update callback in order to do the stroll ai here
+local old_on_update = MonsterClass.on_update
+local update_functions = {}
+function MonsterClass:on_update(callback)
+    update_functions[self] = callback
+end
+
+local stroll_timer = {}
+local angerlist = {}
+
+local mob_config = require "scripts/monster/settings"
+
+local function find_target(mob, config)
+    local target
+    local target_priority
+    local attack_x, attack_y
+
+    for _, being in ipairs(get_beings_in_circle(mob, config.trackrange)) do
+        if being:type() == OBJECT_CHARACTER
+           and being:action() ~= ACTION_DEAD
+        then
+            local anger = angerlist[being] or 0
+            if anger == 0 and config.aggressive then
+                anger = 1
+            end
+
+            local possible_attack_positions = {
+                {
+                    x = being:x() - config.attack_distance or TILESIZE,
+                    y = being:y()
+                },
+                {
+
+                    x = being:x()
+                    y = being:y() - config.attack_distance or TILESIZE,
+                },
+                {
+
+                    x = being:x() + config.attack_distance or TILESIZE,
+                    y = being:y(),
+                },
+                {
+
+                    x = being:x()
+                    y = being:y() + config.attack_distance or TILESIZE,
+                },
+            }
+            for _, point in ipairs(possible_attack_positions) do
+                local priority = calculate_position_priority(mob:position(), point.x, point.y)
+            end
+            
+           
+
+        end
+    end
+end
+
+local function stroll_update(mob, tick)
+    local stroll_tick = stroll_timer[mob]
+    local mobconfig = mob_config[mob:name()]
+
+
+    local trackrange = mobconfig and mobconfig.trackrange or nil
+
+
+    local strollrange = mobconfig and mobconfig.strollrange or nil
+    if (not stroll_tick or stroll_tick <= tick) and strollrange then
+        local x, y = mob:position()
+        local destination_x = math.random(x - strollrange, x + strollrange)
+        local destination_y = math.random(y - strollrange, y + strollrange)
+        if is_walkable(destination_x, destination_y) then
+            mob:walk(destination_x, destination_y)
+        end
+        stroll_timer[mob] = tick + STROLL_TIMEOUT
+                            + math.random(STROLL_TIMEOUT_RANDOMNESS)
+    end
+
+    local monsterclass = get_monster_class(mob:monster_id())
+    local update_function = update_functions[monsterclass]
+    if update_function then
+        return update_function(mob, tick)
+    end
+end
+
+-- Register all update functions for strolling
+for _, monsterclass in ipairs(get_monster_classes()) do
+    old_on_update(monsterclass, stroll_update)
+end