src/reducers/map.js


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import {combineReducers} from "redux";
import {SET_MAP_DIMENSIONS, SET_MAP_POSITION, SET_MAP_SCALE} from "../actions/map";

export function position(state = {x: 0, y: 0}, action) {
    switch (action.type) {
        case SET_MAP_POSITION:
            return {x: action.x, y: action.y};
        default:
            return state;
    }
}

export function dimensions(state = {width: 600, height: 400}, action) {
    switch (action.type) {
        case SET_MAP_DIMENSIONS:
            return {width: action.width, height: action.height};
        default:
            return state;
    }
}

export function scale(state = 1, action) {
    switch (action.type) {
        case SET_MAP_SCALE:
            return action.scale;
        default:
            return state;
    }
}

export const map = combineReducers({
    position,
    dimensions,
    scale
});