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vic20.htm
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<!DOCTYPE html>
<html>
<head>
<title>Vic-20</title>
<script type="text/javascript" src="jquery-1.7.1.min.js"></script>
<style type="text/css">
body
{
background-color:Black;
margin: 0px 0px 0px 0px;
}
div.outerScreen
{
position: absolute;
width:628px;
height:428px;
background-color:Aqua;
margin: 0px 20px 20px 0px;
}
div.innerScreen
{
position: absolute;
width:528px;
height:368px;
background-color:White;
margin: 30px 50px 30px 50px;
}
div.char
{
position: absolute;
background-image: url(petscii.png);
background-position: 0px 0px;
left: 0px;
top: 0px;
width: 768px;
height: 16px;
}
#theInputxxx
{
position: absolute;
left: -999px;
}
</style>
<script type="text/javascript">
var VicChar = function (xx, yy) {
var width = 24,
height = 16,
imagesWidth = width * 32,
$element = $('#innerScreen').append('<div/>').find(':last'),
elemStyle = $element[0].style,
mathFloor = Math.floor,
x = xx,
y = yy,
current = -1,
blinking = false,
blinked = false;
$element.css({
position: 'absolute',
width: width,
height: height,
backgroundImage: 'url(petscii.png)',
display: 'none',
left: (x * width) + 'px',
top: (y * height) + 'px'
});
var that = {
chr: function (c) {
if (c == undefined) {
return current;
}
current = c;
var index = current * width;
var vOffset = -mathFloor(index / imagesWidth) * height;
var hOffset = -index % imagesWidth;
elemStyle.backgroundPosition = hOffset + 'px ' + vOffset + 'px';
if (current >= 0) {
elemStyle.display = 'block';
}
else {
elemStyle.display = 'none';
}
},
blink: function (mode) {
if (mode == 'off') {
blinking = false;
}
else if (mode == 'on') {
blinking = true;
blinked = false;
}
if (!blinked && blinking) {
elemStyle.backgroundPosition = '0px -16px';
elemStyle.display = 'block';
blinked = true;
}
else {
this.chr(current);
blinked = false;
}
if (blinking) {
setTimeout($.proxy(this.blink, this), 400);
}
}
};
return that;
};
function VicScreen() {
var locs = [];
var lineWraps = [];
var lineLengths = [];
var curx = 0, cury = 0;
for (var y = 0; y < 23; y++) {
lineWraps.push(1);
lineLengths.push(0);
for (var x = 0; x < 22; x++) {
locs.push(VicChar(x, y));
}
}
var that = {
char: function (x, y, c) {
if (c == undefined) {
return locs[x + y * 22];
}
else {
locs[x + y * 22].chr(c);
}
},
write: function (c) {
if (c === +c) {
this.cursor('off');
this.char(curx, cury, c);
if (curx >= lineLengths[cury]) {
lineLengths[cury] = curx + 1;
}
if (curx == 21) {
this.newline();
}
else {
this.cursor(curx + 1, cury);
}
}
else {
for (var i = 0; i < c.length; i++) {
this.write(this.char2code(c[i]));
}
}
},
char2code: function (ch) {
if (ch == '*') return 42;
if (ch == ',') return 44;
if (ch == '.') return 46;
if (ch == 'A') return 1;
if (ch == 'B') return 2;
if (ch == 'C') return 3;
if (ch == 'D') return 4;
if (ch == 'E') return 5;
if (ch == 'F') return 6;
if (ch == 'G') return 7;
if (ch == 'H') return 8;
if (ch == 'I') return 9;
if (ch == 'J') return 10;
if (ch == 'K') return 11;
if (ch == 'L') return 12;
if (ch == 'M') return 13;
if (ch == 'N') return 14;
if (ch == 'O') return 15;
if (ch == 'P') return 16;
if (ch == 'Q') return 17;
if (ch == 'R') return 18;
if (ch == 'S') return 19;
if (ch == 'T') return 20;
if (ch == 'U') return 21;
if (ch == 'V') return 22;
if (ch == 'W') return 23;
if (ch == 'X') return 24;
if (ch == 'Y') return 25;
if (ch == 'Z') return 26;
if (ch == '0') return 48;
if (ch == '1') return 49;
if (ch == '2') return 50;
if (ch == '3') return 51;
if (ch == '4') return 52;
if (ch == '5') return 53;
if (ch == '6') return 54;
if (ch == '7') return 55;
if (ch == '8') return 56;
if (ch == '9') return 57;
return -1;
},
left: function () {
if (curx > 0 || cury > 0) {
this.cursor('off');
if (curx == 0) {
curx = 21;
this.up();
}
else {
this.cursor(curx - 1, cury);
}
}
},
right: function () {
this.cursor('off');
if (curx == 21) {
curx = 0;
this.down();
}
else {
this.cursor(curx + 1, cury);
}
},
up: function () {
this.cursor('off');
if (cury > 0) {
cury--;
}
this.cursor(curx, cury);
},
down: function () {
this.cursor('off');
if (cury == 22) {
this.scroll();
}
this.cursor(curx, cury + 1);
},
insert: function () {
if (this.insertAt(curx, cury)) {
this.char(curx, cury, -1);
}
},
insertAt: function (x, y) {
if (lineLengths[y] == 22) {
if (lineWraps[y] == 4) {
return false;
}
if (y < 22) {
lineWraps[y + 1] = lineWraps[y] + 1;
if (this.insertAt(0, y + 1)) {
this.char(0, y + 1, this.char(21, y).chr());
}
else {
return false;
}
}
else {
return false;
}
}
for (var i = 21; i > x; i--) {
this.char(i, y, this.char(i - 1, y).chr());
}
if (lineLengths[y] < 22) {
lineLengths[y] = lineLengths[y] + 1;
}
return true;
},
backspace: function () {
if (curx > 0 || lineWraps[cury] > 1) {
this.left();
this.del(curx, cury);
}
},
del: function (x, y) {
for (var i = x; i <= 20; i++) {
this.char(i, y, this.char(i + 1, y).chr());
}
if (y != cury) {
if (lineLengths[y] == 0) {
this.deleteLine(y);
return;
}
}
if (y == 22) {
this.char(21, y, -1);
lineLengths[y] = lineLengths[y] - 1;
}
else if (y < 22 && lineWraps[y + 1] == 1) {
this.char(21, y, -1);
lineLengths[y] = lineLengths[y] - 1;
if (y != cury) {
if (lineLengths[y] == 0) {
this.deleteLine(y);
return;
}
}
}
else if (y < 22) {
this.char(21, y, this.char(0, y + 1).chr());
this.del(0, y + 1);
}
},
deleteLine: function (line) {
for (var y = line; y <= 21; y++) {
lineWraps[y] = lineWraps[y + 1];
lineLengths[y] = lineLengths[y + 1];
for (var x = 0; x < 22; x++) {
this.char(x, y, this.char(x, y + 1).chr());
}
}
lineWraps[22] = 1;
lineLengths[22] = 0;
for (var x = 0; x < 22; x++) {
this.char(x, 22, -1);
}
},
newline: function (isReturn) {
this.cursor('off');
curx = 0;
if (isReturn) {
cury++;
this.unwrapLine(cury, 1);
}
else {
var count = lineWraps[cury];
cury++;
if (count < 4) {
this.wrapLine(cury);
}
}
if (cury > 22) {
this.scroll();
}
this.cursor(curx, cury);
},
wrapLine: function (y) {
if (y > 23) return;
var count = lineWraps[y];
if (count == 1) {
lineWraps[y] = lineWraps[y - 1] + 1;
}
else {
this.wrapLine(y + 1);
}
},
unwrapLine: function (y, newlength) {
if (y > 23) return;
var count = lineWraps[y];
if (count > 1) {
lineWraps[y] = newlength;
this.unwrapLine(y + 1, newlength + 1);
}
},
scroll: function () {
var lines = 1;
if (lineWraps[3] == 4) lines = 4;
else if (lineWraps[2] == 3) lines = 3;
else if (lineWraps[1] == 2) lines = 2;
for (var i = 0; i < lines; i++) {
this.deleteLine(0);
}
cury -= lines;
},
current: function (x, y) {
locs[curx + cury * 22].blink('off');
curx = x % 22;
cury = y + ((x / 22) >> 0);
},
cursor: function (x, y) {
locs[curx + cury * 22].blink('off');
if (x == 'off') return;
this.current(x, y);
var ch = locs[curx + cury * 22];
ch.blink('on');
},
bootScreen: function () {
this.clear();
this.current(0, 0);
this.write('**** CBM BASIC V2 ****');
this.newline(true);
this.write('3583 BYTES FREE');
this.newline(true);
this.newline(true);
this.write('READY.');
this.newline(true);
},
restoreScreen: function () {
this.clear();
this.current(0, 1);
this.write('READY.');
this.newline(true);
},
clear: function () {
this.current(0, 0);
for (var y = 0; y < 23; y++) {
lineWraps[y] = 1;
lineLengths[y] = 0;
for (var x = 0; x < 22; x++) {
this.char(x, y, -1);
}
}
}
}
return that;
}
$(document).ready(function () {
var s = VicScreen();
s.bootScreen();
$('#theInput').focus();
$('#outerScreen').keyup(function (e) {
if (e.which == 8) {
// backspace
}
else if (e.which == 3) {
s.restoreScreen();
}
else if (e.which == 32) {
s.write(-1);
}
else if (e.which == 45) {
s.insert();
}
else if (e.which == 46) {
s.backspace();
}
else if (e.which == 13) {
s.newline(true);
}
else if (e.which == 37) {
s.left();
}
else if (e.which == 38) {
s.up();
}
else if (e.which == 39) {
s.right();
}
else if (e.which == 40) {
s.down();
}
else if (e.which == 190) {
s.write(46); // .
}
else if (e.which == 188) {
s.write(44); // ,
}
else if (e.which == 186) {
s.write(59); // ;
}
else if (e.which == 187) {
s.write(61); // =
}
else if (e.which >= 65 && e.which < 92) {
s.write(e.which - 64); // alpha
}
else if (e.which >= 48 && e.which <= 57) {
s.write(e.which); // digits
}
else if (e.which == 17 || e.which == 116) {
}
else {
alert('keypress: ' + e.which);
}
return true;
});
});
</script>
</head>
<body>
<div id="outerScreen" class="outerScreen">
<div id="innerScreen" class="innerScreen">
</div>
<input id="theInput" type="text" />
</div>
</body>
</html>