10.1. Encounter triggers
What would Emojimon be without tall grass?
Similar to obstructions, we can make our tall grass terrain type have a chance of triggering an encounter when you walk through it.
Encounter trigger component
Another boolean component to indicate when an entity can trigger an encounter.
// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;
import { BoolComponent } from "std-contracts/components/BoolComponent.sol";
uint256 constant ID = uint256(keccak256("component.EncounterTrigger"));
contract EncounterTriggerComponent is BoolComponent {
constructor(address world) BoolComponent(world, ID) {}
}export const contractComponents = {
EncounterTrigger: defineBoolComponent(world, {
metadata: {
contractId: "component.EncounterTrigger",
},
}),
MapConfig: defineComponent(
world,Make tall grass a trigger
Like obstructions, we'll make an entity for each tall grass tile and give it a position and encounter trigger.
import { PositionComponent, ID as PositionComponentID, Coord } from "components/PositionComponent.sol";
import { ObstructionComponent, ID as ObstructionComponentID } from "components/ObstructionComponent.sol";
import { EncounterTriggerComponent, ID as EncounterTriggerComponentID } from "components/EncounterTriggerComponent.sol";
import { TerrainType } from "../TerrainType.sol";
library MapConfigInitializer {
function init(IWorld world) internal {
…
PositionComponent position = PositionComponent(world.getComponent(PositionComponentID));
ObstructionComponent obstruction = ObstructionComponent(world.getComponent(ObstructionComponentID));
EncounterTriggerComponent encounterTrigger = EncounterTriggerComponent(
world.getComponent(EncounterTriggerComponentID)
);
…
for (uint32 y = 0; y < height; y++) {
for (uint32 x = 0; x < width; x++) {
…
if (terrainType == TerrainType.Boulder) {
uint256 entity = world.getUniqueEntityId();
position.set(entity, Coord(int32(x), int32(y)));
obstruction.set(entity);
} else if (terrainType == TerrainType.TallGrass) {
uint256 entity = world.getUniqueEntityId();
position.set(entity, Coord(int32(x), int32(y)));
encounterTrigger.set(entity);
}
And deploy it.
{
"components": [
"EncounterTriggerComponent",
"MapConfigComponent",
"MovableComponent",