evert/tower-defense
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some visualization difference

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Evert Prants 2017-08-21 11:46:54 +03:00
parent 2890d28b38
commit 52a5c7d0a1
Signed by: evert
GPG Key ID: 1688DA83D222D0B5
1 changed files with 152 additions and 45 deletions
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197
index.js
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@ -1,4 +1,13 @@
window.onload = function () {
/*
My programming practice notes:
* every major feature as part of updating the game (such as towers, enemies)
are handeled in a separate function
* I use Object.assign to copy objects in order to eliminate references when spawning enemies
and to get the ability to modify them individually
* Components such as buttons or selections within the canvas are classes
*/
let canvas = document.getElementById('canvas')
let ctx = canvas.getContext('2d')
@ -27,47 +36,59 @@ window.onload = function () {
tower: 'simple'
}
/**
speed - movement speed multiplier - higher: faster
node - always 1
health - health of the enemy
reward - money earned when killed
frequency - milliseconds to spawn in
icon - currently color of the enemy
*/
let Enemies = {
basic: {
speed: 10,
node: 1,
dmg: 50,
health: 50,
reward: 10
reward: 10,
frequency: 1000,
icon: '#f00'
},
speedy: {
speed: 20,
node: 1,
dmg: 60,
health: 60,
reward: 15
reward: 15,
frequency: 500,
icon: '#f11'
},
tough: {
speed: 5,
node: 1,
dmg: 100,
health: 100,
reward: 20
reward: 20,
frequency: 1000,
icon: '#f40'
}
}
let Towers = {
simple: {
range: 6,
damage: 15,
rate: 20,
name: 'Simple',
speed: 30,
cost: 50,
icon: null
range: 6, // range in tiles
damage: 15, // damage to deal to enemies when hit
rate: 20, // rate of fire, higher - slower
name: 'Simple', // name of the tower
speed: 30, // bullet speed, higher - faster
cost: 50, // cost to place
icon: '#333' // currently color
}
}
let Maps = {
width: 20,
height: 20,
tile: 32,
width: 20, // Width of the map
height: 20, // Height of the map
tile: 32, // Tile size in pixels (each coordinate is multiplied by this number in rendering)
first: {
// map rendering data
tiles: [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
@ -90,6 +111,7 @@ window.onload = function () {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
],
// enemy follow path
pathgen: [
{x: 1, y: 2, end: false},
{x: 14, y: 2, end: false},
@ -155,21 +177,39 @@ window.onload = function () {
}
}
// Use this function to spawn enemies depending on round
function nextWave () {
Game.wave++
if (Game.wave % 5 === 0) {
addEnemies(Game.wave / 5, Enemies.speedy)
} else if (Game.wave % 10 === 0) {
addEnemies(1, Enemies.tough)
} else if (Game.wave > 5) {
if (Game.wave < 5) {
addEnemies(10 + Game.wave, Enemies.basic)
} else {
addEnemies(10 + Game.wave, Enemies.speedy)
if (Game.wave > 10) {
addEnemies(Game.wave - 10, Enemies.tough)
}
}
addEnemies(10 + Game.wave, Enemies.basic)
if (Game.wave > 10) {
addEnemies(Game.wave - 5, Enemies.tough)
}
if (Game.wave % 5 === 0) {
addEnemies(Game.wave / 5, Enemies.tough)
}
}
// Use this function to modify the enemies spawned each round
function waveEnemyModifer (enemy, round) {
// Reduce the time between enemy spawns
let fr = enemy.frequency - 2 * round
if (fr < 100) {
fr = 100
}
enemy.frequency = fr
// Increase enemy health
enemy.health += round * 5
return enemy
}
function getTileIn (map, x, y) {
@ -315,17 +355,25 @@ window.onload = function () {
function addEnemies (cnt, type) {
Game.enemySpawn += cnt
let path = Game.map.pathgen[0]
let enemyCopy = Object.assign({
x: path.x,
y: path.y
}, type)
enemyCopy = waveEnemyModifer(enemyCopy, Game.wave)
enemyCopy.dmg = enemyCopy.health
let ect = setInterval(() => {
if (Game.enemySpawn === 0) return clearInterval(ect)
Game.enemySpawn--
Game.enemies.push(Object.assign({
x: Game.map.pathgen[0].x, y: Game.map.pathgen[0].y
}, type))
}, 1000)
Game.enemies.push(Object.assign({}, enemyCopy))
}, enemyCopy.frequency)
}
function towerAt (x, y) {
function getTowerAt (x, y) {
for (let i in Game.towers) {
let tower = Game.towers[i]
if (tower.x === x && tower.y === y) return tower
@ -334,13 +382,46 @@ window.onload = function () {
return null
}
function canPlaceTowerAt (x, y) {
let tileAt = getTileIn(Game.map.tiles, x, y)
if (tileAt !== 0) return false
// Do not overlap towers
if (getTowerAt(x, y) !== null) return false
// Prevent towers from being placed right next to each-other
let can = true
for (let i in Game.towers) {
if (can === false) break
let tower = Game.towers[i]
// tower placement restriction visualization
for (let i = 0; i < 4; i++) {
if (can === false) break
let ax = tower.x
let ay = tower.y
if (i == 0) {
ax -= 1
} else if (i == 1) {
ax += 1
} else if (i == 2) {
ay -= 1
} else if (i == 3) {
ay += 1
}
if (ax < 0 || ay < 0 || ay > Maps.height || ax > Maps.width) continue
if (ax === x && ay === y) can = false
}
}
return can
}
function placeTower (tower, x, y) {
if (tower.cost > Game.money) return // no money
let tileAt = getTileIn(Game.map.tiles, x, y)
if (tileAt !== 0) return
if (towerAt(x, y)) return
if (!canPlaceTowerAt(x, y)) return
Game.money -= tower.cost
Game.towers.push(Object.assign({
@ -408,15 +489,37 @@ window.onload = function () {
*/
for (let i in Game.towers) {
let tower = Game.towers[i]
ctx.fillStyle = '#333'
ctx.fillStyle = tower.icon
ctx.fillRect(tower.x * mt + 2, tower.y * mt + 2, 28, 28)
if (Game.state === 2 && Game.tower) {
// tower placement restriction visualization
for (let i = 0; i < 4; i++) {
let ax = tower.x
let ay = tower.y
if (i == 0) {
ax -= 1
} else if (i == 1) {
ax += 1
} else if (i == 2) {
ay -= 1
} else if (i == 3) {
ay += 1
}
if (ax < 0 || ay < 0 || ay > Maps.height || ax > Maps.width) continue
if (getTileIn(Game.map.tiles, ax, ay) !== 0) continue
ctx.fillStyle = 'rgba(255, 0, 0, 0.45)'
ctx.fillRect(ax * mt, ay * mt, mt, mt)
}
}
}
for (let i in Game.enemies) {
let enemy = Game.enemies[i]
let rx = (enemy.x * mt) + mt / 8
let ry = (enemy.y * mt) + mt / 8
ctx.fillStyle = '#f00'
ctx.fillStyle = enemy.icon
ctx.fillRect(rx, ry, 16, 16)
// health bars
@ -435,16 +538,20 @@ window.onload = function () {
ctx.fillRect(tower.x * mt + mt / 16, tower.y * mt + mt / 16, 8, 8)
}
// tower range visualization
// tower placement
if (Game.state === 2 && Game.tower && mX < Maps.width && mY < Maps.height) {
// tower range visualization
let towerData = Towers[Game.tower]
ctx.strokeStyle = '#ddd'
ctx.fillStyle = 'rgba(200, 200, 200, 0.25)'
ctx.beginPath()
ctx.arc(mX * mt + mt / 2, mY * mt + mt / 2, towerData.range * mt, 0, 2 * Math.PI)
ctx.stroke()
ctx.fill()
ctx.closePath()
if (towerData.cost <= Game.money && canPlaceTowerAt (mX, mY)) {
let towerData = Towers[Game.tower]
ctx.strokeStyle = '#ddd'
ctx.fillStyle = 'rgba(200, 200, 200, 0.25)'
ctx.beginPath()
ctx.arc(mX * mt + mt / 2, mY * mt + mt / 2, towerData.range * mt, 0, 2 * Math.PI)
ctx.stroke()
ctx.fill()
ctx.closePath()
}
}
ctx.fillStyle = '#996633'