Closes #29

src/Pushwall.ts

@@ -0,0 +1,108 @@
+export type PushWall = {
+    active: boolean;
+    tilesMoved: number;
+    pointsMoved: number;
+    dir: number;
+    x: number;
+    y: number;
+    dx: number;
+    dy: number;
+    texX: number;
+    texY: number;
+}
+
+let PWall: PushWall;
+let Wolf: any; // TODO (al) Remove in the future.
+
+export const push = (
+    level: { tileMap: { [x: string]: { [x: string]: number; }; }; state: { foundSecrets: number; totalSecrets: number; }; wallTexX: { [x: string]: { [x: string]: number; }; }; wallTexY: { [x: string]: { [x: string]: number; }; }; },
+    x: number,
+    y: number,
+    dir: number
+) => {
+    var dx: number, dy: number;
+
+    if (PWall.active) {
+        return false; // another PWall is moving [only one at a time!]
+    }
+
+    dx = Wolf.Math.dx4dir[dir];
+    dy = Wolf.Math.dy4dir[dir];
+
+    if (level.tileMap[x + dx][y + dy] & (Wolf.SOLID_TILE | Wolf.DOOR_TILE)) {
+        // noway (smth is blocking)
+        return true;
+    }
+
+    // remove secret flag & make everything needed when pushwall used!
+    level.tileMap[x][y] &= (~Wolf.SECRET_TILE);
+    level.tileMap[x][y] &= (~Wolf.WALL_TILE);
+    level.tileMap[x][y] |= Wolf.PUSHWALL_TILE;
+
+    if (++level.state.foundSecrets == level.state.totalSecrets) {
+        Wolf.Game.notify("You found the last secret!");
+    } else {
+        Wolf.Game.notify("You found a secret!");
+    }
+
+    Wolf.Sound.startSound(null, null, 1, Wolf.CHAN_AUTO, "sfx/034.wav", 1, Wolf.ATTN_STATIC, 0);
+
+    // good way to avoid stuckness; [un]comment one more down!
+    // it makes a tile behind pushwall unpassable
+    level.tileMap[x + dx][y + dy] |= Wolf.PUSHWALL_TILE;
+    level.wallTexX[x + dx][y + dy] = level.wallTexX[x][y];
+    level.wallTexY[x + dx][y + dy] = level.wallTexY[x][y];
+
+    // write down PWall info
+    PWall.active = true;
+    PWall.tilesMoved = PWall.pointsMoved = 0;
+    PWall.dir = dir;
+    PWall.x = x;
+    PWall.y = y;
+    PWall.dx = dx;
+    PWall.dy = dy;
+    PWall.texX = level.wallTexX[x][y];
+    PWall.texY = level.wallTexY[x][y];
+
+    return true;
+}
+
+export const process = (
+    level: { tileMap: number[][]; wallTexX: number[][]; wallTexY: number[][]; },
+    tics: number
+) => {
+    if (!PWall.active) {
+        return; // no active PWall to work with
+    }
+
+    PWall.pointsMoved += tics;
+
+    if (PWall.pointsMoved < 128) {
+        return;
+    }
+
+    PWall.pointsMoved -= 128;
+    PWall.tilesMoved++;
+    // Free tile
+    level.tileMap[PWall.x][PWall.y] &= (~Wolf.PUSHWALL_TILE);
+    // Occupy new tile
+    PWall.x += PWall.dx;
+    PWall.y += PWall.dy;
+
+    // Shall we move further?
+    if (level.tileMap[PWall.x + PWall.dx][PWall.y + PWall.dy] & (Wolf.SOLID_TILE | Wolf.DOOR_TILE | Wolf.ACTOR_TILE | Wolf.POWERUP_TILE) || PWall.tilesMoved == 3) {
+        level.tileMap[PWall.x][PWall.y] &= (~Wolf.PUSHWALL_TILE); // wall now
+        level.tileMap[PWall.x][PWall.y] |= Wolf.WALL_TILE; // wall now
+        level.wallTexX[PWall.x][PWall.y] = PWall.texX;
+        level.wallTexY[PWall.x][PWall.y] = PWall.texY;
+        PWall.active = false; // Free Push Wall
+    } else {
+        level.tileMap[PWall.x + PWall.dx][PWall.y + PWall.dy] |= Wolf.PUSHWALL_TILE;
+
+        // Not sure if this is right but it fixed an issue with the pushwall texture changing mid-slide.
+        level.wallTexX[PWall.x + PWall.dx][PWall.y + PWall.dy] = PWall.texX;
+        level.wallTexY[PWall.x + PWall.dx][PWall.y + PWall.dy] = PWall.texY;
+    }
+}
+
+export const get = () => PWall;