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Breakout
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<!DOCTYPE html> | |
<head> | |
<title>CanvasBreak</title> | |
<style> | |
body { | |
background: #000; | |
} | |
h1 { | |
color: #FFF; | |
font-size: 25px; | |
text-transform: uppercase; | |
text-align: center; | |
} | |
#container { | |
width: 500px; | |
margin: 0 auto; | |
} | |
#canvas { | |
border: 1px solid #000; | |
} | |
</style> | |
</head> | |
<body> | |
<div id="container"> | |
<h1>CanvasBreak</h1> | |
<canvas id="canvas"></canvas> | |
</div> | |
<script> | |
(function(){ | |
var screen_width = 500; | |
var screen_height = 550; | |
var bar_width = 100; | |
var bar_height = 20; | |
var bar_x = 200; | |
var bar_y = screen_height - bar_height - 5; | |
var bar_speed = 10; | |
var ball_radius = 10; | |
var ball_x = screen_width / 2; | |
var ball_y = bar_y - ball_radius - 5; | |
var ball_moving = false; | |
var ball_xdirection = 1; | |
var ball_ydirection = -1; | |
var ball_speed = 5; | |
var bar_moving = false; | |
var bar_direction = undefined; | |
var brick_width = 50; | |
var brick_height = 20; | |
var brick_lines = 5; | |
var brick_columns = screen_width / brick_width; | |
var bricks = brick_lines * Math.floor(brick_columns); | |
//keys | |
var KEY_LEFT = 37; | |
var KEY_RIGHT = 39; | |
var KEY_SPACE = 32; | |
var canvas = document.getElementById("canvas"); | |
var ctx = canvas.getContext("2d"); | |
canvas.width = screen_width; | |
canvas.height = screen_height; | |
//matriz q identifica os blocos presentes=1(estado inicial) ou destruídos=0 | |
var bricks_board = new Array(); | |
for(var i=0; i<brick_columns; i++){ | |
bricks_board[i] = new Array(); | |
for(var j=0; j<brick_lines; j++){ | |
bricks_board[i][j] = 1; | |
} | |
} | |
var bar_collided = function(){ | |
var xspace = ball_x >= bar_x && ball_x <= bar_x + bar_width; | |
var yspace = ball_y + ball_speed + ball_radius > bar_y; | |
return xspace && yspace; | |
} | |
var bricks_collided = function(ball_x, ball_y){ | |
var xspace = Math.floor((ball_x + ball_radius)/brick_width); | |
var yspace = Math.floor((ball_y - ball_radius - ball_speed)/brick_height); | |
return [xspace, yspace, (xspace>=0 && xspace<=9 && yspace>=0 && yspace<=4)]; | |
} | |
var bricks_draw = function(column, line){ | |
ctx.fillStyle = "#5FF"; | |
ctx.strokeStyle = "black"; | |
ctx.lineWidth = 2; | |
ctx.beginPath(); | |
ctx.rect(column*brick_width, line*brick_height, brick_width, brick_height); | |
ctx.fill(); | |
ctx.stroke(); | |
} | |
var update = function(){ | |
//clear the screen | |
ctx.fillStyle = "white"; | |
ctx.fillRect(0, 0, screen_width, screen_height); | |
//draw bar | |
ctx.fillStyle = "black"; | |
ctx.strokeStyle = "white"; | |
if(bar_moving) | |
{ | |
if(bar_direction == KEY_LEFT && bar_x >= bar_speed){ | |
bar_x -= bar_speed; | |
} | |
if(bar_direction == KEY_RIGHT && bar_x < screen_width - bar_width) | |
bar_x += bar_speed; | |
} | |
ctx.fillRect(bar_x, bar_y, bar_width, bar_height); | |
//draw ball | |
ctx.fillStyle = "red"; | |
ctx.beginPath(); | |
ctx.arc(ball_x, ball_y, ball_radius, 0, Math.PI * 2, true); | |
ctx.fill(); | |
//draw ball | |
if(ball_moving){ | |
bricks_point = bricks_collided(ball_x, ball_y); | |
if (bricks_point[2]==true) { | |
if (bricks_board[bricks_point[0]][bricks_point[1]]==1) { | |
ball_ydirection *= -1; | |
bricks_board[bricks_point[0]][bricks_point[1]]=0; | |
bricks--; | |
if (bricks==0){ | |
alert('Parabés, voce ganhou!'); | |
ball_moving = false; | |
} | |
} | |
} | |
if(ball_x - ball_speed <= 0 || ball_x >= screen_width - ball_radius) | |
ball_xdirection *= -1; | |
if(ball_y - ball_speed <= ball_radius / 2 || bar_collided()) | |
ball_ydirection *= -1; | |
ball_x += ball_speed * ball_xdirection; | |
ball_y += ball_speed * ball_ydirection; | |
if(ball_y > screen_height + ball_speed){ | |
alert("Game over!"); | |
ball_moving = false; | |
} | |
} | |
//draw bricks | |
ctx.fillStyle = "#5FF"; | |
ctx.strokeStyle = "black"; | |
ctx.lineWidth = 2; | |
for(var i=0; i<brick_columns; i++){ | |
for(var j=0; j<brick_lines; j++){ | |
if (bricks_board[i][j]==1) { | |
bricks_draw(i,j); | |
} | |
} | |
} | |
} | |
document.onkeydown = function(e){ | |
if(e.keyCode == KEY_LEFT){ | |
bar_moving = true; | |
bar_direction = KEY_LEFT; | |
} | |
if(e.keyCode == KEY_RIGHT){ | |
bar_moving = true; | |
bar_direction = KEY_RIGHT; | |
} | |
if(e.keyCode == KEY_SPACE){ | |
ball_moving = true; | |
} | |
} | |
document.onkeyup = function(e){ | |
bar_moving = false; | |
} | |
setInterval(update, 24); | |
})(); | |
</script> | |
</body> | |
</html> |
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