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digitaldisplay.js
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digitaldisplay.js
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// Original code shared in the public domain on the 'net by <anonymous>
// Further work by [email protected] - http://sindro.me/
//
function DigitalDisplay (options)
{
var element = options.element;
var width = options.width || 300;
var Color = {
placeholders: options.placeholders || 'Gray',
digits: options.digits || 'Gray'
};
var xScale = options.xScale || 0.6;
var yScale = options.yScale || 0.8;
var context = TBE.GetElement2DContext (element);
var DigitsSegments = [
//
// 1
// --
// 2 | | 4
// -- 8
// 16 | | 32
// --
// 64
1 | 2 | 4 | 16 | 32 | 64,
4 | 32,
1 | 4 | 8 | 16 | 64,
1 | 4 | 8 | 32 | 64,
2 | 4 | 8 | 32,
1 | 2 | 8 | 32 | 64,
1 | 2 | 8 | 16 | 32 | 64,
1 | 4 | 32,
1 | 2 | 4 | 8 | 16 | 32 | 64,
1 | 2 | 4 | 8 | 32 | 64
];
this.clear = function ()
{
TBE.ClearCanvas (element);
}
this.drawNumber = function (value, len, y, height)
{
var segs = createSegments (height);
var fixv = Math.round (value);
var decv = (value - fixv) * 100;
context.fillStyle = Color.placeholders;
context.globalAlpha = 0.15;
// Compute the increment for each digit.
var incr = height * xScale;
// offset relative to mid point of width
var off = ((width - (incr * len)) / 2.0);
// Draw shadow display
for (var n = 0; n < len; n++)
{
drawSingleDigit (segs, 127, off, y);
off += incr;
}
context.fillStyle = Color.digits;
context.globalAlpha = 0.80;
for (var n = 0; n < len; n++)
{
off -= incr;
drawSingleDigit (segs, DigitsSegments[(fixv % 10)], off, y);
fixv = Math.floor (fixv / 10.0);
// Perform the check here so we output a 0
if (fixv == 0)
break;
}
}
function drawSingleDigit (segs, bits, x, y)
{
for (var n = 0; n < 7; n++)
{
if (bits & (1 << n))
context.fillPolygon (offsetPolygon (x, y, segs[n]));
}
}
function createSegments (height)
{
var _x = function (xx) { return xx * height * xScale; }
var _y = function (yy) { return yy * height * yScale; }
var segments =
[ // 1 Upper --
[
_x (0.28), _y (0.08),
_x (1.00), _y (0.08),
_x (0.88), _y (0.15),
_x (0.38), _y (0.15),
_x (0.28), _y (0.08)
],
// 2 Left Upper |
[
_x (0.30), _y (0.49),
_x (0.18), _y (0.52),
_x (0.26), _y (0.10),
_x (0.36), _y (0.17),
_x (0.30), _y (0.49)
],
// 4 Right Upper |
[
_x (1.00), _y (0.10),
_x (0.93), _y (0.52),
_x (0.84), _y (0.49),
_x (0.90), _y (0.17),
_x (1.00), _y (0.11)
],
// 8 Middle --
[
_x (0.20), _y (0.54),
_x (0.31), _y (0.50),
_x (0.83), _y (0.50),
_x (0.90), _y (0.54),
_x (0.82), _y (0.56),
_x (0.29), _y (0.56),
_x (0.20), _y (0.54)
],
// 16 Left Lower |
[
_x (0.22), _y (0.91),
_x (0.10), _y (0.98),
_x (0.17), _y (0.55),
_x (0.28), _y (0.59),
_x (0.22), _y (0.91)
],
// 32 Right Lower |
[
_x (0.92), _y (0.55),
_x (0.87), _y (0.98),
_x (0.78), _y (0.92),
_x (0.82), _y (0.59),
_x (0.92), _y (0.55)
],
// 64 Lower --
[
_x (0.74), _y (0.93),
_x (0.84), _y (1.00),
_x (0.13), _y (1.00),
_x (0.22), _y (0.93),
_x (0.74), _y (0.93)
]
];
return segments;
}
function offsetPolygon (x, y, points)
{
var npoints = points.length;
if (npoints & 1)
npoints--;
var result = new Array ();
for (var n = 0; n < npoints / 2; n++)
{
result[n*2+0] = x + points[n*2+0];
result[n*2+1] = y + points[n*2+1];
}
return result;
}
}