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xenox.html
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xenox.html
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<!DOCTYPE HTML>
<html>
<head>
<title>Xenox</title>
<style>
body { background-color: black; }
#wrapper {
width: 800px;
height: 540px;
position: absolute;
margin: auto;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
#status-canvas-1 {
position: absolute;
top: 0;
}
#main-canvas {
position: absolute;
top: 30px;
}
#status-canvas-2 {
position: absolute;
bottom: 0;
}
</style>
</head>
<body onload="setup()">
<div id="wrapper">
<canvas id="status-canvas-1" width="800" height="25"></canvas>
<canvas id="main-canvas" width="800" height="480"></canvas>
<canvas id="status-canvas-2" width="800" height="25"></canvas>
</div>
</body>
<script>
// GAME PARAMETERS /////////////////////////////////////////////////////////////
const tile_size = 5; // Tile size [px].
const border_width =
3; // Width of the filled border in the initial game field [tiles].
const player_speed = 40; // Player movement speed [tiles/second].
const enemy_speed = 40; // Enemy movement speed [tiles/second].
const enemy_speed_increase_per_level =
1; // Enemy speed increase for each level [tiles/speed/level].
const fps = 60; // Frames per second [Hz].
const n_sub_frames =
10; // Sub-frames for updating player and enemies positions.
const next_level_claimed =
0.75; // Fraction of tiles to be claimed to go to the next level.
const n_initial_enemies = 1; // Number of enemies in level 1.
const n_enemies_per_level = 1; // Number of extra enemies every level.
const enemy_deleter_fraction = 0.25; // Fraction of deleter enemies.
const enemy_claimed_fraction = 0.25; // Fraction of enemies in the claimed area.
const enemy_minimum_steepness =
Math.PI / 12;
const min_claimed_distance_from_player =
30; // Minimum spawn distance of a claimed enemy to the player.
const score_normalization_factor = 1000; // Scaling factor for the score.
const delay_before_new_life = 0.5; // Delay before allowing to restart after
// losing one life or clearing the level [s].
// ENUMERATIONS ////////////////////////////////////////////////////////////////
// Game state constants.
const STATE_PLAYING = 0; // Game is running.
const STATE_PAUSE = 1; // Game has been paused by the death of the player or the
// clearing of the level.
const STATE_GAMEOVER = 2; // Game has ended.
const STATE_INGAME_PAUSE = 3; // The game was manually paused.
// Direction constants.
const DIRECTION_IDLE = 0;
const DIRECTION_N = 1;
const DIRECTION_W = 2;
const DIRECTION_S = 3;
const DIRECTION_E = 4;
// Tile status constants.
const TILE_CLAIMED = 0;
const TILE_UNCLAIMED = 1;
const TILE_LINE = 2;
// Enemy types.
const ENEMY_NORMAL = 0; // Normal "red" enemies, bouncing in the unclaimed area.
const ENEMY_DELETER = 1; // Deleter "green" enemy, bouncing in the unclaimed
// area and unclaiming the claimed tiles it hits.
const ENEMY_CLAIMED = 2; // Enemy bouncing in the claimed area.
// GRAPHICAL PARAMETERS ////////////////////////////////////////////////////////
const color_claimed = "#FFFFFF"; // Color for claimed regions.
const color_unclaimed = "#000000"; // Color for unclaimed regions.
const color_line = "#808080"; // Color for player line while being drawn.
const color_enemy_normal = "#FF0000"; // Color for normal enemies.
const color_enemy_deleter = "#00FF00"; // Color for deleters.
const color_enemy_claimed = "#0000FF"; // Color for enemies in the claimed area.
// BITMAP FONT /////////////////////////////////////////////////////////////////
const bitfont_alphabet = [
"|", "%", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", " ",
"a", "c", "e", "g", "h", "i", "l", "m", "o", "r", "s", "t", "v"
];
const bitfont_characters = [
[ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ], // |
[ 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1 ], // %
[ 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1 ], // 0
[ 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0 ], // 1
[ 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1 ], // 2
[ 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1 ], // 3
[ 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1 ], // 4
[ 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1 ], // 5
[ 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1 ], // 6
[ 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1 ], // 7
[ 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1 ], // 8
[ 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1 ], // 9
[ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ], // <space>
[ 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1 ], // a
[ 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1 ], // c
[ 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 1 ], // e
[ 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1 ], // g
[ 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1 ], // h
[ 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0 ], // i
[ 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1 ], // l
[ 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1 ], // m
[ 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1 ], // o
[ 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1 ], // r
[ 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1 ], // s
[ 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0 ], // t
[ 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0 ] // v
];
const bitfont_kerning = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2,
0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0
];
let BitmapFont = function(alphabet, characters, kerning, w, h, pixel_size) {
this.alphabet = alphabet; // Font alphabet.
this.characters = characters; // Font characters.
this.kerning = kerning; // Kerning.
this.w = w; // Font width.
this.h = h; // Font height.
this.pixel_size = pixel_size;
// Render a single character in given position.
this.render_character = function(context, x, y, char, color) {
let alphabet_idx = this.alphabet.indexOf(char);
if (alphabet_idx < 0)
return 0;
let bit_char = this.characters[alphabet_idx];
context.fillStyle = color;
for (let row = 0; row < this.h; ++row)
for (let col = 0; col < this.w; ++col)
if (bit_char[row * this.w + col])
context.fillRect(x + col * pixel_size, y + row * pixel_size,
pixel_size, pixel_size);
return this.w - this.kerning[alphabet_idx];
};
// Render a string starting from given position.
this.render_string = function(context, x, y, string, color) {
let cur_x = x;
let dx;
for (let i = 0; i < string.length; ++i) {
dx = this.render_character(context, cur_x, y, string.charAt(i), color);
cur_x += (dx + 1) * this.pixel_size;
}
};
// Compute the width of a character without actually rendering it.
this.char_width = function(char) {
let alphabet_idx = this.alphabet.indexOf(char);
if (alphabet_idx < 0)
return 0;
else
return (this.w - this.kerning[alphabet_idx]) * this.pixel_size;
};
// Compute the width of a string without actually rendering it.
this.string_width = function(string) {
let w = 0;
for (let i = 0; i < string.length; ++i)
w += this.char_width(string.charAt(i)) + this.pixel_size;
w -= this.pixel_size;
return w;
};
};
// GAME LOGIC //////////////////////////////////////////////////////////////////
// Game field class.
let Field = function() {
this.state = STATE_PLAYING; // Game state.
this.level = 1; // Current level.
this.w = 0; // Game width [tiles].
this.h = 0; // Game height [tiles].
this.tiles = 0; // Game tiles. An array of arrays, first index: row, last
// index: column.
this.tiles_to_claim =
0; // Helper tile matrix for computing newly claimed tiles.
this.player_lives = 3; // Player lives counter.
this.player_score = 0; // Player score.
this.player_x = 0; // Player x coordinate [tiles].
this.player_y = 0; // Player y coordinate [tiles].
this.player_direction = DIRECTION_IDLE; // Player direction.
this.enemies = 0; // Array of enemies. Each entry is in the format [x, y,
// speed_x, speed_y, type].
this.t = 0; // Elapsed game time [s].
this.pause_time = 0; // Time when pause was triggered.
this.claimed = 0; // Currently claimed fraction.
// Setup method: creates the game field with required dimensions, and sets
// it up for the game.
this.setup = function(w, h) {
this.setup_field(w, h);
this.state = STATE_PLAYING;
this.level = 1;
// Position the player at the top center.
this.player_x = Math.floor(this.w / 2);
this.player_y = 0;
this.player_direction = DIRECTION_IDLE;
this.player_lives = 3;
this.player_score = 0;
// Generate enemies.
this.setup_enemies(n_initial_enemies);
// Reset time.
this.t = 0;
};
// Setup field.
this.setup_field = function(w, h) {
this.w = w;
this.h = h;
this.claimed = 0;
// Create the game field
this.tiles = new Array(h);
this.tiles_to_claim = new Array(h);
for (let row = 0; row < this.h; ++row) {
this.tiles[row] = new Array(w);
this.tiles_to_claim[row] = new Array(w);
for (let col = 0; col < this.w; ++col) {
if (row < border_width || row >= this.h - border_width ||
col < border_width || col >= this.w - border_width) {
this.tiles[row][col] = TILE_CLAIMED;
this.claimed++;
} else
this.tiles[row][col] = TILE_UNCLAIMED;
}
}
};
// Setup enemies.
this.setup_enemies = function(n_enemies) {
// First remove all existing enemies, if any.
this.enemies = new Array(n_enemies);
// Compute amount of enemies of each type.
let n_deleters = Math.floor(n_enemies * enemy_deleter_fraction);
let n_claimed = Math.floor(n_enemies * enemy_claimed_fraction);
let n_normal = n_enemies - n_deleters;
// Generate the new enemies in random positions and with random speed.
for (let i = 0; i < n_normal + n_deleters + n_claimed; ++i) {
let type = i < n_deleters ? ENEMY_DELETER
: (i < (n_deleters + n_claimed) ? ENEMY_CLAIMED
: ENEMY_NORMAL);
let x, y, theta;
do {
x = Math.floor(Math.random() * this.w);
y = Math.floor(Math.random() * this.h);
} while ((type == ENEMY_CLAIMED &&
(this.tiles[y][x] != TILE_CLAIMED ||
(x - this.player_x) * (x - this.player_x) +
(y - this.player_y) * (y - this.player_y) <
min_claimed_distance_from_player *
min_claimed_distance_from_player)) ||
(type != ENEMY_CLAIMED && this.tiles[y][x] != TILE_UNCLAIMED));
do {
theta = Math.random() * 2 * Math.PI;
} while (Math.abs(theta) < enemy_minimum_steepness ||
Math.abs(theta - Math.PI / 2) < enemy_minimum_steepness ||
Math.abs(theta - Math.PI) < enemy_minimum_steepness ||
Math.abs(theta - 3 * Math.PI / 2) < enemy_minimum_steepness ||
Math.abs(theta - 2 * Math.PI) < enemy_minimum_steepness);
let speed = enemy_speed + this.level * enemy_speed_increase_per_level;
this.enemies[i] =
[ x, y, speed * Math.cos(theta), speed * Math.sin(theta), type ];
}
};
// Update method.
this.update = function(t) {
if (this.state == STATE_PLAYING) {
// Get old tile coordinates.
let old_tile_x = Math.floor(this.player_x);
let old_tile_y = Math.floor(this.player_y);
this.update_player(t);
// Get new tile coordinates.
let new_tile_x = Math.floor(this.player_x);
let new_tile_y = Math.floor(this.player_y);
// If the player moved from an unclaimed tile, draw the line there.
if ((old_tile_x != new_tile_x || old_tile_y != new_tile_y) &&
this.tiles[old_tile_y][old_tile_x] == TILE_UNCLAIMED) {
this.tiles[old_tile_y][old_tile_x] = TILE_LINE;
// If the player reached an already claimed area, compute the new
// claimed area.
if (this.tiles[new_tile_y][new_tile_x] == TILE_CLAIMED) {
this.check_new_claimed_area();
this.player_direction = DIRECTION_IDLE;
this.player_x = new_tile_x;
this.player_y = new_tile_y;
}
// If the player hit his own line, he dies.
if (this.tiles[new_tile_y][new_tile_x] == TILE_LINE)
this.die();
}
this.update_enemies(t);
// Check collisions between enemies and player.
this.check_collisions();
this.t += t;
}
};
// Update the player position.
this.update_player = function(t) {
// Move the player.
let dx = t * player_speed;
if (this.player_direction == DIRECTION_N)
this.player_y -= dx;
else if (this.player_direction == DIRECTION_W)
this.player_x -= dx;
else if (this.player_direction == DIRECTION_S)
this.player_y += dx;
else if (this.player_direction == DIRECTION_E)
this.player_x += dx;
// Check that the player is not out of bounds.
if (this.player_x < 0) {
this.player_x = 0;
this.player_direction = DIRECTION_IDLE;
}
if (this.player_x >= this.w) {
this.player_x = this.w - 1;
this.player_direction = DIRECTION_IDLE;
}
if (this.player_y < 0) {
this.player_y = 0;
this.player_direction = DIRECTION_IDLE;
}
if (this.player_y >= this.h) {
this.player_y = this.h - 1;
this.player_direction = DIRECTION_IDLE;
}
};
// Update the enemies' positions.
this.update_enemies = function(t) {
for (let i = 0; i < this.enemies.length; ++i) {
// Obstacle tile type.
let tile_walkable =
this.enemies[i][4] == ENEMY_CLAIMED ? TILE_CLAIMED : TILE_UNCLAIMED;
let tile_obstacle =
this.enemies[i][4] == ENEMY_CLAIMED ? TILE_UNCLAIMED : TILE_CLAIMED;
// Move the enemy.
this.enemies[i][0] += this.enemies[i][2] * t;
this.enemies[i][1] += this.enemies[i][3] * t;
// Compute tile coordinates.
let tile_x = Math.floor(this.enemies[i][0]);
let tile_y = Math.floor(this.enemies[i][1]);
// Surrounding tiles.
let tile_nw = tile_x >= 0 && tile_y >= 0 ? this.tiles[tile_y][tile_x]
: tile_obstacle;
let tile_ne = tile_x < this.w - 1 && tile_y >= 0
? this.tiles[tile_y][tile_x + 1]
: tile_obstacle;
let tile_sw = tile_x >= 0 && tile_y < this.h - 1
? this.tiles[tile_y + 1][tile_x]
: tile_obstacle;
let tile_se = tile_x < this.w - 1 && tile_y < this.h - 1
? this.tiles[tile_y + 1][tile_x + 1]
: tile_obstacle;
// Hit flags.
let hit_nw = tile_nw != tile_walkable;
let hit_ne = tile_ne != tile_walkable;
let hit_sw = tile_sw != tile_walkable;
let hit_se = tile_se != tile_walkable;
// Penetration lengths.
let dn = Math.ceil(this.enemies[i][1]) - tile_y;
let dw = Math.ceil(this.enemies[i][0]) - tile_x;
let ds = tile_y - Math.floor(this.enemies[i][0]);
let de = tile_x - Math.floor(this.enemies[i][1]);
// Maximum penetration length.
let d_max = Math.max(dn, dw, ds, de);
// Check collisions and handle them.
if (hit_nw && hit_ne && this.enemies[i][3] < 0) {
this.enemies[i][3] *= -1;
this.enemies[i][1] = Math.ceil(this.enemies[i][1]);
} else if (hit_nw && hit_sw && this.enemies[i][2] < 0) {
this.enemies[i][2] *= -1;
this.enemies[i][0] = Math.ceil(this.enemies[i][0]);
} else if (hit_sw && hit_se && this.enemies[i][3] > 0) {
this.enemies[i][3] *= -1;
this.enemies[i][1] = Math.floor(this.enemies[i][1]);
} else if (hit_ne && hit_se && this.enemies[i][2] > 0) {
this.enemies[i][2] *= -1;
this.enemies[i][0] = Math.floor(this.enemies[i][0]);
} else if (d_max == dn &&
(tile_nw != tile_walkable || tile_ne != tile_walkable) &&
this.enemies[i][3] < 0) {
this.enemies[i][3] *= -1;
this.enemies[i][1] = Math.ceil(this.enemies[i][0]);
} else if (d_max == dw &&
(tile_nw != tile_walkable || tile_sw != tile_walkable) &&
this.enemies[i][2] < 0) {
this.enemies[i][2] *= -1;
this.enemies[i][0] = Math.ceil(this.enemies[i][0]);
} else if (d_max == ds &&
(tile_sw != tile_walkable || tile_se != tile_walkable) &&
this.enemies[i][3] > 0) {
this.enemies[i][3] *= -1;
this.enemies[i][1] = Math.floor(this.enemies[i][1]);
} else if (d_max == de &&
(tile_ne != tile_walkable || tile_se != tile_walkable) &&
this.enemies[i][2] > 0) {
this.enemies[i][2] *= -1;
this.enemies[i][0] = Math.floor(this.enemies[i][0]);
}
if (this.enemies[i][4] == ENEMY_DELETER) {
if (hit_nw && tile_x > 0 && tile_y > 0) {
this.tiles[tile_y][tile_x] = TILE_UNCLAIMED;
this.claimed--;
}
if (hit_ne && tile_y > 0 && tile_x < this.w - 2) {
this.tiles[tile_y][tile_x + 1] = TILE_UNCLAIMED;
this.claimed--;
}
if (hit_sw && tile_x > 0 && tile_y < this.h - 2) {
this.tiles[tile_y + 1][tile_x] = TILE_UNCLAIMED;
this.claimed--;
}
if (hit_se && tile_x < this.w - 2 && tile_y < this.h - 2) {
this.tiles[tile_y + 1][tile_x + 1] = TILE_UNCLAIMED;
this.claimed--;
}