@woosh/meep-engine/editor/actions/concrete/PatchTerrainHeightAction.js

Pure JavaScript game engine. Fully featured and production ready.

import { ModifyPatchSampler2DAction } from "./ModifyPatchSampler2DAction.js";

export class PatchTerrainHeightAction extends ModifyPatchSampler2DAction {
    /**
     *
     * @param {Terrain} terrain
     * @param {number} x
     * @param {number} y
     * @param {number} width
     * @param {number} height
     */
    constructor(terrain, x, y, width, height) {
        super(terrain.samplerHeight, [x, y, x + width, y + height]);

        /**
         *
         * @type {Terrain}
         */
        this.terrain = terrain;
    }

    async updateTerrain() {
        /**
         *
         * @type {Terrain}
         */
        const terrain = this.terrain;

        terrain.updateHeightTexture();
        terrain.updateWorkerHeights();

        /**
         *
         * @type {Sampler2D}
         */
        const heightMap = terrain.samplerHeight;

        /**
         *
         * @type {TerrainTileManager}
         */
        const tiles = terrain.__tiles;

        const x = this.x;
        const y = this.y;

        const u0 = x / heightMap.width;
        const u1 = (x + this.patch.width) / heightMap.height;

        const v0 = y / heightMap.height;
        const v1 = (y + this.patch.height) / heightMap.height;

        tiles.rebuildTilesByUV(u0, v0, u1, v1);
    }

    async apply(context) {
        await super.apply(context);

        await this.updateTerrain();
    }

    async revert(context) {
        await super.revert(context);

        await this.updateTerrain();
    }
}