feat(jsbattle): bundle circler tank

packages/jsbattle-engine/src/tanks/circler.tank.js

@@ -0,0 +1,124 @@
+// Author: Jonathan Cross
+importScripts('lib/tank.js');
+
+tank.init(function(settings, info) {
+  settings.SKIN = "forest"
+
+  wander_turn_counter = 0;
+  circle_dir = 1.0;
+  boost_counter = 0;
+  prev_energy = 100;
+});
+
+function controlGun(state, control) {
+  if (!state.radar.enemy) {
+    // Fire randomly in the hope to hit something by luck.
+    control.GUN_TURN = 1;
+    control.SHOOT = 0.1;
+    return;
+  }
+
+  // Predict where the enemy will be to adjust the gun angle.
+  let enemy = state.radar.enemy;
+  let bullet_speed = 4;
+  let distance = Math.distance(state.x, state.y, enemy.x, enemy.y)
+  let bullet_time = distance / bullet_speed;
+  let target = {x: enemy.x + bullet_time * enemy.speed * Math.cos(Math.deg2rad(enemy.angle)),
+                y: enemy.y + bullet_time * enemy.speed * Math.sin(Math.deg2rad(enemy.angle))};
+  let enemy_angle = Math.deg.atan2(target.y - state.y, target.x - state.x);
+  let gun_angle_diff = Math.deg.normalize(enemy_angle - state.gun.angle - state.angle);
+
+  control.GUN_TURN = 0.3 * gun_angle_diff;
+  control.SHOOT = 0.1;
+}
+
+function controlRadar(state, control) {
+  if (!state.radar.enemy) {
+    control.RADAR_TURN = 1;
+    return;
+  }
+
+  // Try to keep the radar fixed on the enemy.
+  let dx = state.radar.enemy.x - state.x;
+  let dy = state.radar.enemy.y - state.y;
+  let enemy_angle = Math.deg.atan2(dy, dx);
+  let radar_angle_diff = Math.deg.normalize(enemy_angle - state.radar.angle - state.angle);
+  control.RADAR_TURN = 0.3 * radar_angle_diff;
+}
+
+// Just go in straight lines; if we hit a wall then turn randomly.
+function wander(state, control) {
+  if (wander_turn_counter > 0) {
+    wander_turn_counter--;
+    control.TURN = -1.0;
+    control.THROTTLE = 0.0;
+    return;
+  }
+
+  control.TURN = 0.0;
+  control.THROTTLE = 1.0;
+
+  if (state.collisions.wall) {
+    wander_turn_counter = Math.round(Math.randomRange(40, 70));
+  }
+}
+
+// Circle around an enemy, changing direction if we
+// hit something to avoid getting stuck.
+function circleEnemy(state, control) {
+  if (state.collisions.wall || state.collisions.enemy) {
+    circle_dir *= -1;
+  }
+
+  let enemy = state.radar.enemy;
+
+  // Get the unit vector from us to the enemy.
+  let r = Math.distance(state.x, state.y, enemy.x, enemy.y)
+  let u = {x: (enemy.x - state.x) / r,
+           y: (enemy.y - state.y) / r};
+
+  // Find the target point to move toward.  In the coordinate system
+  // where our tank is to the west and the enemy is to the east,
+  // the target point is 150 units west of the enemy, and
+  // either 100 north or 100 south, depending on circle_dir.
+  let target = {x: enemy.x - 150*u.x - 100*circle_dir*u.y,
+                y: enemy.y - 150*u.y + 100*circle_dir*u.x};
+  let target_angle = Math.deg.atan2(target.y - state.y, target.x - state.x);
+  let target_angle_diff = Math.deg.normalize(target_angle - state.angle);
+
+  // Move toward target_angle.  If we need to turn more than 90 degrees,
+  // then reverse direction and turn the opposite way.
+  let forwards = Math.abs(target_angle_diff) > 90 ? -1.0 : 1.0;
+  control.TURN = forwards * 0.5 * target_angle_diff;
+  control.THROTTLE = forwards * 1.0;
+}
+
+function controlBoost(state, control) {
+  if (boost_counter > 0) {
+    control.BOOST = 1;
+    boost_counter--;
+  } else {
+    control.BOOST = 0;
+  }
+
+  // If we took damage, then enable boost for a short time to get away.
+  if (prev_energy != state.energy) {
+    boost_counter = 10;
+  }
+  prev_energy = state.energy;
+}
+
+function controlMovement(state, control) {
+  if (!state.radar.enemy) {
+    wander(state, control);
+  } else {
+    circleEnemy(state, control);
+  }
+}
+
+tank.loop(function(state, control) {
+  controlRadar(state, control);
+  controlGun(state, control);
+  controlMovement(state, control);
+  controlBoost(state, control);
+});

packages/jsbattle-engine/src/tanks/index.json

@@ -6,5 +6,6 @@
   "dodge",
   "sniper",
   "kamikaze",
+  "circler",
   "jamro"
 ]

packages/jsbattle-react/public/tanks/circler.tank.js

@@ -0,0 +1,124 @@
+// Author: Jonathan Cross
+importScripts('lib/tank.js');
+
+tank.init(function(settings, info) {
+  settings.SKIN = "forest"
+
+  wander_turn_counter = 0;
+  circle_dir = 1.0;
+  boost_counter = 0;
+  prev_energy = 100;
+});
+
+function controlGun(state, control) {
+  if (!state.radar.enemy) {
+    // Fire randomly in the hope to hit something by luck.
+    control.GUN_TURN = 1;
+    control.SHOOT = 0.1;
+    return;
+  }
+
+  // Predict where the enemy will be to adjust the gun angle.
+  let enemy = state.radar.enemy;
+  let bullet_speed = 4;
+  let distance = Math.distance(state.x, state.y, enemy.x, enemy.y)
+  let bullet_time = distance / bullet_speed;
+  let target = {x: enemy.x + bullet_time * enemy.speed * Math.cos(Math.deg2rad(enemy.angle)),
+                y: enemy.y + bullet_time * enemy.speed * Math.sin(Math.deg2rad(enemy.angle))};
+  let enemy_angle = Math.deg.atan2(target.y - state.y, target.x - state.x);
+  let gun_angle_diff = Math.deg.normalize(enemy_angle - state.gun.angle - state.angle);
+
+  control.GUN_TURN = 0.3 * gun_angle_diff;
+  control.SHOOT = 0.1;
+}
+
+function controlRadar(state, control) {
+  if (!state.radar.enemy) {
+    control.RADAR_TURN = 1;
+    return;
+  }
+
+  // Try to keep the radar fixed on the enemy.
+  let dx = state.radar.enemy.x - state.x;
+  let dy = state.radar.enemy.y - state.y;
+  let enemy_angle = Math.deg.atan2(dy, dx);
+  let radar_angle_diff = Math.deg.normalize(enemy_angle - state.radar.angle - state.angle);
+  control.RADAR_TURN = 0.3 * radar_angle_diff;
+}
+
+// Just go in straight lines; if we hit a wall then turn randomly.
+function wander(state, control) {
+  if (wander_turn_counter > 0) {
+    wander_turn_counter--;
+    control.TURN = -1.0;
+    control.THROTTLE = 0.0;
+    return;
+  }
+
+  control.TURN = 0.0;
+  control.THROTTLE = 1.0;
+
+  if (state.collisions.wall) {
+    wander_turn_counter = Math.round(Math.randomRange(40, 70));
+  }
+}
+
+// Circle around an enemy, changing direction if we
+// hit something to avoid getting stuck.
+function circleEnemy(state, control) {
+  if (state.collisions.wall || state.collisions.enemy) {
+    circle_dir *= -1;
+  }
+
+  let enemy = state.radar.enemy;
+
+  // Get the unit vector from us to the enemy.
+  let r = Math.distance(state.x, state.y, enemy.x, enemy.y)
+  let u = {x: (enemy.x - state.x) / r,
+           y: (enemy.y - state.y) / r};
+
+  // Find the target point to move toward.  In the coordinate system
+  // where our tank is to the west and the enemy is to the east,
+  // the target point is 150 units west of the enemy, and
+  // either 100 north or 100 south, depending on circle_dir.
+  let target = {x: enemy.x - 150*u.x - 100*circle_dir*u.y,
+                y: enemy.y - 150*u.y + 100*circle_dir*u.x};
+  let target_angle = Math.deg.atan2(target.y - state.y, target.x - state.x);
+  let target_angle_diff = Math.deg.normalize(target_angle - state.angle);
+
+  // Move toward target_angle.  If we need to turn more than 90 degrees,
+  // then reverse direction and turn the opposite way.
+  let forwards = Math.abs(target_angle_diff) > 90 ? -1.0 : 1.0;
+  control.TURN = forwards * 0.5 * target_angle_diff;
+  control.THROTTLE = forwards * 1.0;
+}
+
+function controlBoost(state, control) {
+  if (boost_counter > 0) {
+    control.BOOST = 1;
+    boost_counter--;
+  } else {
+    control.BOOST = 0;
+  }
+
+  // If we took damage, then enable boost for a short time to get away.
+  if (prev_energy != state.energy) {
+    boost_counter = 10;
+  }
+  prev_energy = state.energy;
+}
+
+function controlMovement(state, control) {
+  if (!state.radar.enemy) {
+    wander(state, control);
+  } else {
+    circleEnemy(state, control);
+  }
+}
+
+tank.loop(function(state, control) {
+  controlRadar(state, control);
+  controlGun(state, control);
+  controlMovement(state, control);
+  controlBoost(state, control);
+});

packages/jsbattle-react/public/tanks/index.json

@@ -6,5 +6,6 @@
   "dodge",
   "sniper",
   "kamikaze",
+  "circler",
   "jamro"
 ]