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var Glyph = {
glyphs: [],
ratio: null,
head: null,
os2: null,
hmtx: null,
width: null,
height: null,
scale: 1.0,
splitPath: function(path) {
return path.match(/([a-z])|(-?\d+(?:\.\d+)?)/ig);
},
drawPath: function(ctx, path) {
var p = Glyph.splitPath(path);
if (!p) {
return;
}
var l = p.length;
var i = 0;
ctx.beginPath();
while(i < l) {
var v = p[i];
switch(v) {
case "M":
ctx.moveTo(p[++i], p[++i]);
break;
case "L":
ctx.lineTo(p[++i], p[++i]);
break;
case "Q":
ctx.quadraticCurveTo(p[++i], p[++i], p[++i], p[++i]);
break;
case "z":
i++;
break;
default:
i++;
}
}
ctx.fill();
ctx.closePath();
},
drawSVGContours: function(ctx, contours) {
// Is the path
if (!$.isArray(contours)) {
Glyph.drawPath(ctx, contours);
return;
}
var contour, path, transform;
for (var ci = 0, cl = contours.length; ci < cl; ci++) {
contour = contours[ci];
path = contour.contours;
transform = contour.transform;
ctx.save();
ctx.transform(transform[0], transform[1], transform[2], transform[3], transform[4], transform[5]);
Glyph.drawSVGContours(ctx, path);
ctx.restore();
}
},
drawHorizLine: function(ctx, y, color) {
ctx.beginPath();
ctx.strokeStyle = color;
ctx.moveTo(0, y);
ctx.lineTo(Glyph.width * Glyph.ratio, y);
ctx.closePath();
ctx.stroke();
},
draw: function (canvas, shape, gid) {
var element = canvas[0];
var ctx = element.getContext("2d");
var ratio = Glyph.ratio;
var width = Glyph.width * Glyph.scale;
var height = Glyph.height * Glyph.scale;
ctx.clearRect(0, 0, width, height);
ctx.lineWidth = ratio / Glyph.scale;
// Invert axis
ctx.translate(0, height);
ctx.scale(1/ratio, -(1/ratio));
ctx.scale(Glyph.scale, Glyph.scale);
ctx.translate(0, -Glyph.head.yMin);
// baseline
Glyph.drawHorizLine(ctx, 0, "rgba(0,255,0,0.2)");
// ascender
Glyph.drawHorizLine(ctx, Glyph.os2.typoAscender, "rgba(255,0,0,0.2)");
// descender
Glyph.drawHorizLine(ctx, -Math.abs(Glyph.os2.typoDescender), "rgba(255,0,0,0.2)");
ctx.translate(-Glyph.head.xMin, 0);
ctx.save();
var s = ratio*3;
ctx.strokeStyle = "rgba(0,0,0,0.5)";
ctx.lineWidth = (ratio * 1.5) / Glyph.scale;
// origin
ctx.beginPath();
ctx.moveTo(-s, -s);
ctx.lineTo(+s, +s);
ctx.moveTo(+s, -s);
ctx.lineTo(-s, +s);
ctx.closePath();
ctx.stroke();
// horizontal advance
var advance = Glyph.hmtx[gid][0];
ctx.beginPath();
ctx.moveTo(-s+advance, -s);
ctx.lineTo(+s+advance, +s);
ctx.moveTo(+s+advance, -s);
ctx.lineTo(-s+advance, +s);
ctx.closePath();
ctx.stroke();
ctx.restore();
if (!shape) {
return;
}
// glyph bounding box
ctx.beginPath();
ctx.strokeStyle = "rgba(0,0,0,0.3)";
ctx.rect(0, 0, shape.xMin + shape.xMax, shape.yMin + shape.yMax);
ctx.closePath();
ctx.stroke();
ctx.strokeStyle = "black";
//ctx.globalCompositeOperation = "xor";
Glyph.drawSVGContours(ctx, shape.SVGContours);
},
drawAll: function(){
$.each(Glyph.glyphs, function(i, g){
Glyph.draw($('#glyph-canvas-'+g[0]), g[1], g[0]);
});
},
resize: function(value){
Glyph.scale = value / 100;
$.each(document.getElementsByTagName('canvas'), function(i, canvas){
canvas.height = Glyph.height * Glyph.scale;
canvas.width = Glyph.width * Glyph.scale;
});
Glyph.drawAll();
}
};
$(function(){
Glyph.drawAll();
});
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