forked from roopunk/HTML5-Tetris
/
index.html
225 lines (202 loc) · 4.56 KB
/
index.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.1//EN"
"http://www.w3.org/TR/xhtml-basic/xhtml-basic11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<title>HTML5 Tetris</title>
<script type="text/javscript" src="base.js"></script>
<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript" src="jquery.hotkeys.js"></script>
<script type="text/javascript" src="key_status.js"></script>
</head>
<body>
<canvas id="myCanvas" width="400" height="400" style="border:1px solid #c3c3c3;">
Your browser does not support the canvas element.
</canvas>
<div id="points" style="font-size:20pt"></div>
<script type="text/javascript">
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
var FPS = 60;
var CANVAS_WIDTH = 400;
var CANVAS_HEIGHT = 400;
var objectColor = "rgb(100,200,200)";
ctx.fillStyle = objectColor;
var objectExists = 0;
var xpos = 0;
var ypos = 0;
var otype = 0;
var speed = 1;
var cycle; // the param to keep track of the cycle
var topcanvaspos = 0;
var running = 0;
var points = 0;
/*
1. square ( 50 by 50)
2. rectangle ( 75 by 25)
*/
var height = [50, 25];
var width = [50, 75];
function initObject()
{
keydown.down = false;
xpos = 25*Math.floor(Math.random()*((CANVAS_WIDTH-width[otype])/25 + 1));
ypos = 0;
otype = 0;//Math.floor(Math.random()*5);
objectExists = 1;
}
function checkForEmptiness(x, y, w, h)
{
var i, j;
for( i=x;i<x+w;i++) {
for(j=y;j<y+h;j++)
{
var p = ctx.getImageData(i, j, 1, 1).data;
if((p[0] != 100) && (p[1] != 200) && (p[2] != 200))
return false;
}
}
return true;
}
function checkRegion(x, y, w, h)
{
//alert("checking region "+x+" "+y+" "+w+" "+h);
var i, j;
for( i=x;i<x+w;i++) {
for(j=y;j<y+h;j++)
{
var p = ctx.getImageData(i, j, 1, 1).data;
//var hex = "#" + ("000000" + rgbToHex(p[0], p[1], p[2])).slice(-6);
if((p[0] == 100) && (p[1] == 200) && (p[2] == 200))
return false;
}
}
return true;
}
function checkObject(type, x, y, dir)
{
//alert("checking");
if(y+height[type] >= CANVAS_HEIGHT)
return false;
if(type == 0){
if(dir=="left" && !checkRegion(x-25,y,25,height[type]))
return false;
if(dir=="right" && !checkRegion(x+width[type],y,25,height[type]))
return false;
if(dir=="down" && !checkRegion(x,y+height[type],width[type],speed))
return false;
//else alert("true");
}
return true;
}
function clearObject(type, x, y)
{
ctx.save();
ctx.setTransform(1,0,0,1,0,0);
ctx.clearRect(x,y, 50, 50);
ctx.restore();
}
function drawObject(type, x, y)
{
ctx.fillRect(x,y, 50, 50);
//alert("drawn");
}
function hideRows()
{
for(i=topcanvaspos;i<CANVAS_HEIGHT && topcanvaspos<CANVAS_HEIGHT;i++)
{
if( checkForEmptiness(0,i, CANVAS_WIDTH, 1)) {
// copying the rectangle below
if( i != topcanvaspos)
{
var imagedata = ctx.getImageData(0, topcanvaspos, CANVAS_WIDTH, i-topcanvaspos);
topcanvaspos++;
ctx.putImageData(imagedata, 0, topcanvaspos);
}
else
{
topcanvaspos++;
}
// deleting the top most layer
ctx.clearRect(0,topcanvaspos-1, CANVAS_WIDTH, 1);
points+=10;
$('#points').text(points);
}
}
// alert("done");
}
function clearCanvas()
{
ctx.save();
ctx.setTransform(1,0,0,1,0,0);
ctx.clearRect(0,0, CANVAS_WIDTH, CANVAS_HEIGHT);
ctx.restore();
}
function update()
{
//alert("updating");
if(!objectExists)
initObject();
else {
var tempx = xpos;
var tempy = ypos;
if (keydown.left && xpos>=25) { //for moving left
if(checkObject(otype, xpos, ypos, "left")) {
xpos -= 25;
//clearObject(otype, xpos+2, ypos);
}
}
else if (keydown.right && xpos<(CANVAS_WIDTH-width[otype])) { // for moving right
if(checkObject(otype, xpos, ypos, "right")) {
xpos += 25;
//clearObject(otype, xpos-2, ypos);
}
}
if(keydown.down) FPS = 200;
else FPS = 30;
//alert(temp);
if(checkObject(otype, xpos, ypos,"down")) {
ypos+=speed;
clearObject(otype, tempx, tempy);
}
else if( ypos < 5)
{
// clearTimeout(cycle);
running = 0;
$('#points').html("You got: "+points+ " points");
alert("game over");
}
else
{
topcanvaspos = ypos;
objectExists = 0;
}
}
}
function draw()
{
//redrawing the canvas
if(objectExists)
{
drawObject(otype, xpos, ypos);
}
else
hideRows();
}
function init() {
if(running == 0)
{
running = 1;
ctx.clearRect(0,0,CANVAS_WIDTH, CANVAS_HEIGHT);
points = 0;
$('#points').html("");
}
update();
draw();
if(running)
setTimeout(init, 1000/FPS);
}
</script>
<button onclick='init()'>start game</button>
</body>
</html>