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snowballs.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<!--
Copyright (c) 2010, Alex Cruikshank
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of Alex Cruikshank nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-->
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Snowballs</title>
<meta name="generator" content="TextMate http://macromates.com/">
<meta name="author" content="sivoh">
<style type="text/css" media="screen">
#game { display:block; margin: 0px auto; }
</style>
<script type="text/javascript" charset="utf-8">
/* TODO:
- Fix alignment of player, snowball and monsters. Right now, everything happens at the top left
corner
- Monster velocity: (md-sd)*(l/(l+tf)) + sd
md = max difficulty. sd = starting difficulty (fraction of mv). tf = timing factor
if we want the difficulty to be 80% of md at a given level, l80, then
.8*md = (md-sd)*(l80/(l80 + tf)) + sd => tf = l80*((md-sd)/(.8*md - sd) - 1)
*/
var NORTH=0,SOUTH=1,WEST=2,EAST=3;
var DIRECTIONS = [NORTH,SOUTH,WEST,EAST];
var ANTIDIRECTIONS = [SOUTH,NORTH,EAST,WEST];
var MAXX=18, MAXY=10;
var MONSTER_COUNT = function(level) {
if ( level > 12 )
return 15;
return level + 3;
}
var STUN_DURATION = 5;
var SNOWBALL_VELOCITY = .25, PLAYER_VELOCITY = .25;
var START_MONSTER_VELOCITY = .025, MAX_MONSTER_VELOCITY = .2;
var FIFTY_PERCENT_VELOCITY_LEVEL = 10;
var MONSTER_VELOCITY= function(level) {
var md = MAX_MONSTER_VELOCITY, sd = START_MONSTER_VELOCITY, l50 = FIFTY_PERCENT_VELOCITY_LEVEL;
var tf = l50*((md-sd)/(.5*md - sd) - 1);
return (md-sd)*(level/(level+tf)) + sd;
};
var FRAME_INTERVAL = 33;
var game = null;
function Chooser() {
var choices=[], weights=[0], totalWeight=0, allpublic={};
var add = allpublic.add = function( obj, weight ) {
choices.push(obj);
weights.push( totalWeight += weight );
return allpublic;
}
var choose = allpublic.choose = function() {
if ( choices.length == 0 )
return null;
var choice = Math.random() * totalWeight, start=0, end=weights.length-1, next;
while ( end > start + 1 ) {
next=start+Math.floor((end - start)/2);
if ( choice >= weights[next] )
start = next;
else
end = next;
}
return choices[start];
}
return allpublic;
}
function Player(x,y,nodes) {
var alive = true, direction=0, moving = false;
var snowballs = nodes[y][x].takeSnowball();
var xv = [0,0,-PLAYER_VELOCITY,PLAYER_VELOCITY], yv = [-PLAYER_VELOCITY,PLAYER_VELOCITY,0,0]
function move(dir) {
var intx = Math.round(x), inty = Math.round(y);
if ( dir != null ) {
moving = true;
direction = dir;
return;
}
if ( moving ) {
if ((( direction == NORTH ) || ( direction == SOUTH )) && ( x != intx )) {
x += x > intx ? -PLAYER_VELOCITY : PLAYER_VELOCITY;
} else if ((( direction == EAST ) || ( direction == WEST )) && ( y != inty )) {
y += y > inty ? -PLAYER_VELOCITY : PLAYER_VELOCITY;
} else if ((x != intx) || (y != inty) || (nodes[inty][intx].path(direction))) {
x += xv[direction];
y += yv[direction];
}
}
if (Math.abs(x - intx) < .0001)
x = intx;
if (Math.abs(y - inty) < .0001)
y = inty;
if ((x == intx) && (y == inty) && ( snowballs + nodes[y][x].hasSnowball() <= 10 ))
snowballs += nodes[y][x].takeSnowball();
}
function halt() { moving = false; }
function getx() {
return x;
}
function gety() {
return y;
}
function testAttack( monster ) {
if ( monster.freeze() > 4 )
return Math.abs(monster.x() - x) > .25 || Math.abs(monster.y() - y) > .25;
return alive = Math.abs(monster.x() - x) > .25 || Math.abs(monster.y() - y) > .25;
}
function getalive() { return alive; }
function getsnowballs() { return snowballs; }
function getdirection() { return direction; }
function throwSnowball() {
snowballs--;
return Snowball(x, y,direction,nodes);
}
return {x:getx, y:gety, move:move, snowballs:getsnowballs, alive:getalive, halt:halt,
testAttack:testAttack, direction:getdirection, throwSnowball:throwSnowball};
}
function Snowball(x,y,dir,nodes) {
var dx = [0,0,-1,1][dir]*SNOWBALL_VELOCITY, dy = [-1,1,0,0][dir]*SNOWBALL_VELOCITY;
function move() {
var ix = Math.round(x), iy = Math.round(y);
y += dy;
x += dx;
return (ix == Math.round(x) && iy == Math.round(y)) || nodes[iy][ix].path(dir);
}
function getx() { return x; }
function gety() { return y; }
return {x:getx, y:gety, move:move};
}
function integerCrossing( x, delta ) { return Math.floor(x) != Math.floor(x+delta); }
function integerCrossed( x, delta ) { return Math.max(Math.floor(x), Math.floor(x+delta)); }
function Monster(x,y,nodes,level) {
var xv = [0,0,-MONSTER_VELOCITY(level),MONSTER_VELOCITY(level)];
var yv = [-MONSTER_VELOCITY(level),MONSTER_VELOCITY(level),0,0]
var direction = NORTH, freeze = 0, stun=0, me;
function chooseDirection( ) {
var possibilities = Chooser();
for ( var i=0; i < 4; i++ )
if ( nodes[y][x].path(i) )
possibilities.add(i, ( ANTIDIRECTIONS[i] != direction ) ? 10 : 1 );
return possibilities.choose();
}
function move() {
if ( freeze > 4 )
return;
if ( stun > 0 ) {
stun--;
return;
}
if (( integerCrossing(x,xv[direction]) ) || ( integerCrossing(y,yv[direction]) )) {
var xint = integerCrossed(x,xv[direction]);
var yint = integerCrossed(y,yv[direction]);
var moved = Math.abs( x - xint + y - yint );
x = xint; y = yint;
direction = chooseDirection();
x += xv[direction] + (xv[direction] < 0 ? moved : (xv[direction] > 0 ? -moved : 0));
y += yv[direction] + (yv[direction] < 0 ? moved : (yv[direction] > 0 ? -moved : 0));
} else {
x += xv[direction];
y += yv[direction];
}
}
function getx() {
return x;
}
function gety() {
return y;
}
function testAttack( snowball ) {
if ( Math.abs(snowball.x() - x) <= .5 && Math.abs(snowball.y() - y) <= .5 ) {
freeze += 1;
stun = STUN_DURATION;
return true;
}
return false;
}
function bounceIfNear(monster) {
if ( monster == me )
return;
if ( Math.abs(monster.x() - x) <= .5 && Math.abs(monster.y() - y) <= .5 ) {
direction = ANTIDIRECTIONS[direction];
while ( Math.abs(monster.x() - x) <= .5 && Math.abs(monster.y() - y) <= .5 )
move();
}
}
function stunned() { return stun > 0; }
function getfreeze() { return freeze };
return (me = {x:getx, y:gety, move:move, freeze:getfreeze, testAttack:testAttack,
stunned:stunned, bounceIfNear:bounceIfNear });
}
function Node(x,y,snowball,nodes, snowballChooser) {
var paths = [false,false,false,false];
function choosePath() {
var potentialPaths = Chooser();
if ( !paths[NORTH] && y>0 )
potentialPaths.add(NORTH, paths[SOUTH] ? 3 : 1 );
if ( !paths[SOUTH] && y<MAXY-1 )
potentialPaths.add(SOUTH, paths[NORTH] ? 3 : 1 );
if ( !paths[WEST] && x>0 )
potentialPaths.add(WEST, paths[EAST] ? 3 : 1 );
if ( !paths[EAST] && x<MAXX-1 )
potentialPaths.add(EAST, paths[WEST] ? 3 : 1 );
return potentialPaths.choose();
}
function addPath(dir) {
if ( dir != null ) {
paths[dir] = true;
return null;
}
dir = choosePath();
if ( dir == null )
return null;
paths[dir] = true;
var toy = y + [-1,1,0,0][dir], tox = x + [0,0,-1,1][dir], newNode = null;
if ( ! nodes[toy][tox] )
nodes[toy][tox] = newNode = Node(tox,toy,snowballChooser.choose(),nodes, snowballChooser);
nodes[toy][tox].addPath([SOUTH,NORTH,EAST,WEST][dir]);
return newNode;
}
function hasSnowball() {
return snowball;
}
function takeSnowball() {
var size = snowball;
snowball = 0;
return size;
}
function path(direction) {
return paths[direction];
}
return nodes[y][x] = {x:x, y:y, addPath:addPath, path:path,
hasSnowball:hasSnowball, takeSnowball:takeSnowball};
}
function Game( level ) {
var i, j, nodes, player, monsters, frozenMonsters, mover, snowballs, step=0;
function start() {
nodes = createMaze();
player = Player(0,0,nodes);
snowballs = [];
frozenMonsters = []
monsters = [];
for (i=0; i < MONSTER_COUNT(level); i++)
monsters.push( Monster(MAXX-1,MAXY-1,nodes,level) );
draw();
mover = setInterval( update, FRAME_INTERVAL );
var dirmap = {38:NORTH,40:SOUTH,37:WEST,39:EAST};
document.onkeydown = function( evt ) {
if (!evt)
var evt = window.event;
var code = evt.keyCode || evt.which;
if ( code in dirmap )
move( dirmap[code] );
switch ( code ) {
case 27:
if ( paused() )
resume();
else
pause();
break;
case 32:
throwSnowball();
break;
}
}
document.onkeyup = function( evt ) {
if (!evt)
var evt = window.event;
var code = evt.keyCode || evt.which;
if (( code in dirmap ) && ( dirmap[code] == direction() ))
haltPlayer();
}
}
function createMaze() {
var nodes = [];
for (var i=0; i < 10; i++)
nodes[i] = [];
var snowballChooser = Chooser().add(0,10).add(1,10).add(2,3).add(5,1)
var node = Node(0,0,snowballChooser.choose(),nodes,snowballChooser);
var maxnode = node;
var allnodes = [node];
while ( ! nodes[MAXY-1][MAXX-1] ) {
node = node.addPath();
if ( node != null ) {
allnodes.push(node);
if ( node.x + node.y > maxnode.x + maxnode.y )
maxnode = node;
} else
node = maxnode;
}
while ( allnodes.length < MAXX*MAXY / 2 ) {
node = allnodes[Math.floor(Math.random() * allnodes.length)].addPath();
while ( node != null ) {
allnodes.push(node);
node = node.addPath();
}
}
return nodes;
}
function pause() {
if ( mover ) {
clearInterval(mover);
mover = null;
}
}
function resume() {
if (( mover == null ) && ( player.alive() )) {
mover = setInterval(update, FRAME_INTERVAL );
}
}
function paused() {
return mover == null;
}
function move( direction ) {
player.move(direction);
}
function throwSnowball() {
if ( player.snowballs() > 0 )
snowballs.push( player.throwSnowball() );
}
function haltPlayer() {
player.halt();
}
function direction() {
return player.direction();
}
function removeAll( ar, instances ) {
for ( var i=0,l=instances.length; i < l; i++ ) {
for ( var j=0, l2=ar.length; j < l2; j++ ) {
if ( instances[i] == ar[j] ) {
ar.splice(j,1);
break;
}
}
}
}
function update() {
var monstersEliminated = [];
for ( var i=0,monster; monster = monsters[i]; i++ ) {
monster.move();
for ( var j=0,frozen; frozen = frozenMonsters[j]; j++ ) {
monster.bounceIfNear(frozen);
}
if ( ! player.testAttack( monster ) ) {
if ( monster.freeze() > 4 ) {
monstersEliminated.push(monster);
continue;
}
draw();
clearInterval(mover);
drawGameOver();
mover = null;
return;
}
for ( var j=0,snowball; snowball = snowballs[j]; j++ ) {
if ( monster.testAttack(snowball) ) {
snowballs.splice(j,1);
if ( monster.freeze() == 5 ) {
monstersNeedRefresh = true;
frozenMonsters.push(monster);
}
break;
}
}
}
removeAll( monsters, monstersEliminated );
removeAll( frozenMonsters, monstersEliminated );
if ( monsters.length + frozenMonsters.length == 0 ) {
draw();
drawCongratulations();
clearInterval(mover);
mover = null;
setTimeout( levelUp, 2000 );
return;
}
var liveSnowballs = [];
for ( i=0,snowball; snowball = snowballs[i]; i++ )
if ( snowball.move() )
liveSnowballs.push(snowball);
snowballs = liveSnowballs;
player.move();
draw();
step++;
}
function levelUp() {
game = Game(level + 1);
game.start();
}
function getContext() {
var canvas = document.getElementById('game');
return canvas.getContext('2d');
}
function draw() {
var canvas = document.getElementById('game');
var ctx = getContext();
var node;
ctx.clearRect(0,0,ctx.canvas.width,ctx.canvas.height);
drawPath(ctx);
drawSnowballs(ctx);
drawPlayer(ctx);
drawMonsters( monsters, ctx);
if ( step < 2 *1000 / FRAME_INTERVAL ) {
message("LEVEL " + (level+1), 'rgba(200,200,130,.5)')
}
}
function drawPath(ctx) {
for (var i=0; i < MAXY; i++) {
for (var j=0; j<MAXX; j++) {
if ( node = nodes[i][j] ) {
ctx.fillStyle = 'rgb(96,96,96)';
ctx.fillRect(10+50*j,10+50*i,30,30);
if ( node.path(EAST) )
ctx.fillRect(40+50*j,10+50*i,20,30);
if ( node.path(SOUTH) )
ctx.fillRect(10+50*j,40+50*i,30,20);
if ( node.hasSnowball() ) {
ctx.fillStyle = 'rgb(255,255,255)';
ctx.beginPath();
ctx.arc(25+50*j,25+50*i, 2+node.hasSnowball(), 0, Math.PI*2, false);
ctx.closePath();
ctx.fill();
}
}
}
}
}
function drawMonsters( monsters, ctx ) {
for ( var i=0,monster; monster = monsters[i]; i++)
drawMonster( ctx, monster.x()*50, monster.y()*50, monster.freeze(), monster.stunned() );
}
function drawMonster( ctx, x, y, freeze, stunned ) {
ctx.fillStyle = 'rgb(175,125,225)';
fillarc(ctx,25,23,9,0,Math.PI*2,x,y);
ctx.fillRect(19+x,32 + y,5,3);
ctx.fillRect(26+x,32 + y,5,3);
ctx.fillStyle = 'rgb(255,255,255)';
ctx.beginPath();
ctx.arc(22 + x,21 + y, 3, 0, Math.PI*2, false);
ctx.arc(28 + x,21 + y, 3, 0, Math.PI*2, false);
ctx.closePath();
ctx.fill();
switch ( freeze ) {
case 0: break;
case 1:
fillarc(ctx, 25, 23, 9, -3*Math.PI/4, -Math.PI/4, x, y );
break;
case 2:
fillarc(ctx, 25, 23, 9, -Math.PI, 0, x, y );
break;
case 3:
fillarc(ctx, 25, 23, 9, 3*Math.PI/4, Math.PI/4, x, y );
break;
case 4:
fillarc(ctx,25,23,9,0,Math.PI*2,x,y);
break;
default:
fillarc(ctx,25,23,9,0,Math.PI*2,x,y);
ctx.fillRect(16+x,23+y,18,12);
break;
}
if ( stunned ) {
ctx.fillStyle = 'rgb(0,0,0)';
fillarc(ctx, 25, 27, 1.5, 0, 2*Math.PI, x, y );
} else {
ctx.fillRect(23+x,26 + y,4,2);
ctx.fillRect(22+x,26 + y,6,1);
}
ctx.fillStyle = 'rgb(0,0,0)';
ctx.beginPath();
ctx.arc(22 + x,21 + y, 1, 0, Math.PI*2, false);
ctx.arc(28 + x,21 + y, 1, 0, Math.PI*2, false);
ctx.closePath();
ctx.fill();
}
function drawSnowballs(ctx) {
ctx.strokeStyle = 'rgb(60,60,60)';
ctx.fillStyle = 'rgb(255,255,255)';
for ( var i=0,snowball; snowball = snowballs[i]; i++ ) {
ctx.lineWidth = 1;
ctx.beginPath();
ctx.arc(25 + snowball.x()*50,25 + snowball.y()*50, 3, 0, Math.PI*2, false);
ctx.closePath();
ctx.fill();
ctx.stroke();
}
}
function drawPlayer(ctx) {
ctx.fillStyle = 'rgb(255,125,125)';
var x = player.x(), y = player.y(), direction = player.direction(), gx=50*x, gy=50*y;
if ( player.alive() ) {
ctx.beginPath();
ctx.arc(25 + gx,15 + gy, 4, 0, Math.PI*2, false);
ctx.closePath();
ctx.fill();
ctx.fillRect(23+gx,20 + gy,4,10);
ctx.fillStyle = 'rgb(92,92,92)';
ctx.fillRect(23+gx,13+gy,1,1);
ctx.fillRect(26+gx,13+gy,1,1);
ctx.fillRect(24+gx,15+gy,1,1);
ctx.fillRect(24+gx,17+gy,2,1);
ctx.fillStyle = 'rgb(255,125,125)';
filltrap( ctx, 23,20, 20,28, 22,28, 23,22, gx, gy );
filltrap( ctx, 27,20, 30,28, 28,28, 27,22, gx, gy );
filltrap( ctx, 23,30, 20,36, 23,36, 25,30, gx, gy );
filltrap( ctx, 27,30, 30,36, 27,36, 25,30, gx, gy );
if ( direction == NORTH )
filltriangle(ctx, 22, 9, 28, 9, 25, 5, gx, gy);
if ( direction == SOUTH )
filltriangle(ctx, 22, 39, 28, 39, 25, 43, gx, gy);
if ( direction == EAST )
filltriangle(ctx, 31, 12, 31, 18, 35, 15, gx, gy);
if ( direction == WEST )
filltriangle(ctx, 19, 12, 19, 18, 15, 15, gx, gy);
}
else
{
ctx.beginPath();
ctx.arc(17 + gx,34 + gy, 4, 0, Math.PI*2, false);
ctx.closePath();
ctx.fill();
ctx.fillRect(20+gx,34+gy,16,4);
ctx.fillRect(34+gx,32+gy,2,2);
}
ctx.fillStyle = 'rgb(150,150,150)';
fillarc( ctx, 30, 530, 15, Math.PI/2, -Math.PI/2, 0, 0 );
ctx.fillRect(30, 515, 285, 30 );
fillarc( ctx, 315, 530, 15, -Math.PI/2, Math.PI/2, 0, 0 );
ctx.fillStyle = 'rgb(255,255,255)';
ctx.strokeStyle = 'rgb(60,60,60)';
ctx.lineWidth = 1;
for (var i=0,l = player.snowballs(); i < l; i++ ) {
fillarc( ctx, 35, 530, 8, 0, Math.PI*2, 30*i, 0 );
ctx.stroke();
}
ctx.fillStyle = 'rgb(150,150,150)';
ctx.beginPath();
ctx.moveTo(600,515);
ctx.lineTo(885,515);
ctx.arc( 885, 530, 15, -Math.PI/2, Math.PI/2, false );
ctx.lineTo(600,545);
ctx.arc( 600, 530, 15, Math.PI/2, -Math.PI/2, false );
ctx.closePath();
ctx.fill();
for ( var i=0,l=MONSTER_COUNT(level)-monsters.length; i < l; i++)
drawMonster( ctx, 855 - 30*i, 505, 0, false );
ctx.fillStyle = 'rgb(150,150,150)';
ctx.font = 'bold 20pt Helvetica,Arial';
var levelText = 'level ' + (level + 1)
var metrics = ctx.measureText(levelText);
var start = (ctx.canvas.width - metrics.width)/2.0
ctx.fillText(levelText, start, 540 );
}
function drawGameOver() {
message( "GAME OVER", 'rgba(80,60,120,.5)' );
}
function drawCongratulations() {
message( "GOOD JOB!", 'rgba(240,120,120,.5)' );
}
function message( text, fillStyle ) {
var ctx = getContext();
ctx.fillStyle = fillStyle;
ctx.strokeStyle = 'rgb(255,255,255)';
ctx.lineWidth = 5.0;
ctx.font = 'bold 100pt Helvetica,Arial';
var metrics = ctx.measureText(text);
var start = (ctx.canvas.width - metrics.width)/2.0
ctx.beginPath();
ctx.strokeText(text, start, 280 );
ctx.fillText(text, start, 280 );
}
function arc( ctx, x, y, r, start, end, xoffset, yoffset ) {
ctx.beginPath();
ctx.arc(x + xoffset,y + yoffset, r, start, end, false);
ctx.closePath();
}
function fillarc( ctx, x, y, r, start, end, xoffset, yoffset ) {
ctx.beginPath();
ctx.arc(x + xoffset,y + yoffset, r, start, end, false);
ctx.closePath();
ctx.fill();
}
function filltriangle(ctx, x1,y1,x2,y2,x3,y3, xoffset, yoffset ) {
ctx.beginPath();
ctx.moveTo(x1+xoffset,y1+yoffset);
ctx.lineTo(x2+xoffset,y2+yoffset);
ctx.lineTo(x3+xoffset,y3+yoffset);
ctx.closePath();
ctx.fill();
}
function filltrap(ctx, x1,y1,x2,y2,x3,y3,x4,y4, xoffset, yoffset ) {
ctx.beginPath();
ctx.moveTo(x1+xoffset,y1+yoffset);
ctx.lineTo(x2+xoffset,y2+yoffset);
ctx.lineTo(x3+xoffset,y3+yoffset);
ctx.lineTo(x4+xoffset,y4+yoffset);
ctx.closePath();
ctx.fill();
}
return { pause:pause, start:start, resume:resume, paused:paused, direction:direction,
move:move, throwSnowball:throwSnowball, haltPlayer:haltPlayer }
}
function init() {
var game = Game(0);
game.start();
}
</script>
</head>
<body onload="init()">
<canvas id="game" width="900" height="560"></canvas>
<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
try {
var pageTracker = _gat._getTracker("UA-620051-11");
pageTracker._trackPageview();
} catch(err) {}</script>
</body>
</html>