[crosscode] add experimental keyboard-only controls

crosscode/btw-i-use-arch-mod/poststart.js

@@ -1,6 +1,8 @@
 // ac2pic: NOOOOO YOU CAN'T JUST PUT EVERYTHING IN POSTSTART/MAIN
 // dmitmel: haha text editor go brrrr
 
+export {};
+
 ig.input.bind(ig.KEY.J, 'aim');
 ig.input.bind(ig.KEY.K, 'dash');
 
@@ -10,32 +12,207 @@ function findRootGuiElement(clazz) {
 
 const quickMenu = findRootGuiElement(sc.QuickMenu);
 
-function onPostUpdate() {
-  if (ig.loading || sc.model.isPlayerControlBlocked()) return;
+const myAddon = {
+  name: 'btw I use Arch addon',
 
-  if (ig.input.pressed('btw-i-use-arch.open-map-menu')) {
-    if (
-      sc.model.currentState == sc.GAME_MODEL_STATE.GAME &&
-      sc.model.currentSubState == sc.GAME_MODEL_SUBSTATE.MENU &&
-      sc.menu.currentMenu === sc.MENU_SUBMENU.MAP &&
-      // check if the help screen or a dialog isn't opened, otherwise it will
-      // block the screen after switching back to the game
-      ig.interact.entries.last() === sc.menu.buttonInteract
-    ) {
-      closeMapMenu();
-      sc.BUTTON_SOUND.back.play();
-    } else if (
-      sc.model.currentState == sc.GAME_MODEL_STATE.GAME &&
-      sc.model.currentSubState == sc.GAME_MODEL_SUBSTATE.RUNNING &&
-      // check if the quick menu has been unlocked yet, the map menu becomes
-      // available at the same moment
-      sc.model.player.getCore(sc.PLAYER_CORE.QUICK_MENU)
-    ) {
-      let openedMapMenu = openMapMenu();
-      sc.BUTTON_SOUND[openedMapMenu ? 'submit' : 'denied'].play();
+  onPostUpdate() {
+    if (ig.loading || sc.model.isPlayerControlBlocked()) return;
+
+    if (ig.input.pressed('btw-i-use-arch.open-map-menu')) {
+      if (
+        sc.model.isGame() &&
+        sc.model.isMenu() &&
+        sc.menu.currentMenu === sc.MENU_SUBMENU.MAP &&
+        // check if the help screen or a dialog isn't opened, otherwise it will
+        // block the screen after switching back to the game
+        ig.interact.entries.last() === sc.menu.buttonInteract
+      ) {
+        closeMapMenu();
+        sc.BUTTON_SOUND.back.play();
+      } else if (
+        sc.model.isGame() &&
+        sc.model.isRunning() &&
+        // check if the quick menu has been unlocked yet, the map menu becomes
+        // available at the same moment
+        sc.model.player.getCore(sc.PLAYER_CORE.QUICK_MENU)
+      ) {
+        let openedMapMenu = openMapMenu();
+        sc.BUTTON_SOUND[openedMapMenu ? 'submit' : 'denied'].play();
+      }
     }
-  }
-}
+  },
+};
+
+ig.ENTITY.Crosshair.inject({
+  // Normally the `this._getThrowerPos` method is used to calculate where the
+  // balls are thrown _from_ in almost screen coordinates, but we can repurpose
+  // it to calculate where the balls should be thrown _at_ to hit an entity.
+  _getThrowPosForEntity(outVec2, entity) {
+    let realThrower = this.thrower;
+    try {
+      this.thrower = entity;
+      return this._getThrowerPos(outVec2);
+    } finally {
+      this.thrower = realThrower;
+    }
+  },
+});
+
+// these two constants will come in handy later, see `focusNextEntity`
+const ENTITY_FOCUS_DIRECTION = {
+  FARTHER: 1,
+  CLOSER: -1,
+};
+
+// buffer vectors for calculations
+let vec2a = Vec2.create();
+let vec2b = Vec2.create();
+
+sc.PlayerCrossHairController.inject({
+  focusedEntity: null,
+  prevMousePos: Vec2.createC(-1, -1),
+
+  updatePos(...args) {
+    // gamepad mode is unsupported because I don't have one to test this code on
+    if (this.gamepadMode) {
+      this.parent(...args);
+      return;
+    }
+
+    let [crosshair] = args;
+
+    // focus the next available entity if this combatant is e.g. dead
+    if (
+      this.focusedEntity != null &&
+      !this.shouldEntityBeFocused(this.focusedEntity)
+    ) {
+      this.focusNextEntity(crosshair, ENTITY_FOCUS_DIRECTION.CLOSER);
+    }
+
+    let mouseX = sc.control.getMouseX();
+    let mouseY = sc.control.getMouseY();
+    if (
+      this.focusedEntity != null &&
+      // unfocus if the mouse has been moved
+      (this.prevMousePos.x !== mouseX || this.prevMousePos.y !== mouseY)
+    ) {
+      this.focusedEntity = null;
+    }
+    Vec2.assignC(this.prevMousePos, mouseX, mouseY);
+
+    // handle controls
+    let pressedFocusCloser = ig.input.pressed('circle-left');
+    let pressedFocusFarther = ig.input.pressed('circle-right');
+    if (pressedFocusCloser) {
+      this.focusNextEntity(crosshair, ENTITY_FOCUS_DIRECTION.CLOSER);
+    }
+    if (pressedFocusFarther) {
+      this.focusNextEntity(crosshair, ENTITY_FOCUS_DIRECTION.FARTHER);
+    }
+    if (
+      (pressedFocusCloser || pressedFocusFarther) &&
+      this.focusedEntity == null
+    ) {
+      sc.BUTTON_SOUND.denied.play();
+    }
+
+    if (this.focusedEntity != null) {
+      this.calculateCrosshairPos(crosshair);
+    } else {
+      this.parent(...args);
+    }
+  },
+
+  focusNextEntity(crosshair, direction) {
+    let throwerPos = crosshair._getThrowerPos(vec2a);
+
+    function getSqrDistToEntity(entity) {
+      let entityPos = crosshair._getThrowPosForEntity(vec2b, entity);
+      return Vec2.squareDistance(throwerPos, entityPos);
+    }
+
+    let prevFocusedEntity = this.focusedEntity;
+    let prevFocusedSqrDist =
+      prevFocusedEntity != null ? getSqrDistToEntity(prevFocusedEntity) : null;
+    this.focusedEntity = null;
+
+    let closestNextEntitySqrDist = null;
+    for (let entity of this.findFocusingCandidateEntities()) {
+      if (entity === prevFocusedEntity) continue;
+
+      let sqrDist = getSqrDistToEntity(entity);
+      if (
+        // multiplication by `dirFactor` effectively inverts the comparison
+        // operator when it is negative, otherwise logically the expression
+        // stays the same
+        (prevFocusedSqrDist == null ||
+          sqrDist * direction > prevFocusedSqrDist * direction) &&
+        (closestNextEntitySqrDist == null ||
+          sqrDist * direction < closestNextEntitySqrDist * direction)
+      ) {
+        closestNextEntitySqrDist = sqrDist;
+
+        this.focusedEntity = entity;
+      }
+    }
+  },
+
+  shouldEntityBeFocused(combatant) {
+    return (
+      !combatant.isDefeated() &&
+      // `sc.ENEMY_AGGRESSION.TEMP_THREAT` exists, but to be honest I have no
+      // idea what it is supposed to do
+      combatant.aggression === sc.ENEMY_AGGRESSION.THREAT
+    );
+  },
+
+  findFocusingCandidateEntities() {
+    let allCombatants = sc.combat.activeCombatants[sc.COMBATANT_PARTY.ENEMY];
+    let candidates = allCombatants.filter((enemy) =>
+      this.shouldEntityBeFocused(enemy),
+    );
+
+    if (candidates.length === 0) {
+      candidates = ig.game.shownEntities.filter(
+        (entity) =>
+          entity != null &&
+          !entity._killed &&
+          entity instanceof ig.ENTITY.Enemy &&
+          ig.CollTools.isInScreen(entity.coll) &&
+          this.shouldEntityBeFocused(entity),
+      );
+    }
+
+    return candidates;
+  },
+
+  calculateCrosshairPos(crosshair) {
+    let { thrower } = crosshair;
+    let throwerPos = crosshair._getThrowerPos(vec2a);
+    let entityPos = crosshair._getThrowPosForEntity(vec2b, this.focusedEntity);
+    let entityVel = this.focusedEntity.coll.vel;
+
+    let ballInfo = sc.PlayerConfig.getElementBall(
+      thrower,
+      thrower.model.currentElementMode,
+      // NOTE: This causes glitches when the ball speed affects the crosshair
+      // position too much, in which case it begins jumping back and forth
+      // because the charged status is reset due to the movement. I hope this
+      // isn't to much of a problem.
+      crosshair.isThrowCharged(),
+    );
+    let ballSpeed = ballInfo.data.speed;
+
+    let crosshairPos = crosshair.coll.pos;
+    Vec2.assign(crosshairPos, entityPos);
+    // perform entity movement prediction repeatedly to increase the precision
+    for (let i = 0; i < 3; i++) {
+      let t = Vec2.distance(throwerPos, crosshairPos) / ballSpeed;
+      crosshairPos.x = entityPos.x + Math.round(entityVel.x) * t;
+      crosshairPos.y = entityPos.y + Math.round(entityVel.y) * t;
+    }
+  },
+});
 
 function openMapMenu() {
   // Check for the common conditions upfront, because opening and then
@@ -90,11 +267,9 @@ function closeMapMenu() {
 }
 
 {
-  let inputPostUpdateIdx = ig.game.addons.postUpdate.findIndex(
+  let globalInputAddonIdx = ig.game.addons.postUpdate.findIndex(
     (addon) => addon instanceof sc.GlobalInput,
   );
-  console.assert(inputPostUpdateIdx >= 0, 'inputPostUpdateIdx >= 0');
-  ig.game.addons.postUpdate.splice(inputPostUpdateIdx + 1, 0, {
-    onPostUpdate,
-  });
+  console.assert(globalInputAddonIdx >= 0, 'inputPostUpdateIdx >= 0');
+  ig.game.addons.postUpdate.splice(globalInputAddonIdx + 1, 0, myAddon);
 }