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library.js
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mergeInto(LibraryManager.library, {
js_stroke: function(n, points, colia, linewidth) {
points = Module.HEAPF64.subarray(points / 8, points / 8 + n * 2);
var rgb = Module.HEAPU8.subarray(colia, colia + 4);
var context = Module.context;
context.beginPath();
context.strokeStyle = "rgba(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + "," + rgb[3] + ")";
context.lineWidth = linewidth;
context.moveTo(points[0], points[1]);
for (var i = 1; i < n; i++) {
context.lineTo(points[i * 2], points[i * 2 + 1]);
}
context.stroke();
},
js_pattern_routine: function(n, px, py, colia) {
colia = Module.HEAPU8.subarray(colia, colia + 64 * 4);
px = Module.HEAPF64.subarray(px / 8, px / 8 + n);
py = Module.HEAPF64.subarray(py / 8, py / 8 + n);
var context = Module.context;
context.beginPath();
context.moveTo(px[0], py[0]);
for (var i = 1; i < n; i++) {
context.lineTo(px[i], py[i]);
}
context.lineTo(px[0], py[0]);
var imageData = context.createImageData(8, 8);
imageData.data.set(colia);
var img = document.createElement('canvas');
img.width = imageData.width;
img.height = imageData.height;
img.getContext("2d").putImageData(imageData, 0, 0);
var pattern = context.createPattern(img, "repeat");
context.fillStyle = pattern;
context.fill("evenodd");
},
js_fill_routine: function(n, px, py, colia) {
var rgba = Module.HEAPU8.subarray(colia, colia + 4);
px = Module.HEAPF64.subarray(px / 8, px / 8 + n);
py = Module.HEAPF64.subarray(py / 8, py / 8 + n);
var context = Module.context;
context.beginPath();
context.moveTo(px[0], py[0]);
for (var i = 1; i < n; i++) {
context.lineTo(px[i], py[i]);
}
context.lineTo(px[0], py[0]);
context.fillStyle = "rgba(" + rgba[0] + "," + rgba[1] + "," + rgba[2] + "," + rgba[3] + ")";
context.fill("evenodd");
},
js_cellarray: function(x, y, width, height, colia) {
var context = Module.context;
context.beginPath();
colia = Module.HEAPU8.subarray(colia, colia + width * height * 4);
var imageData = context.createImageData(width, height);
imageData.data.set(colia);
var img = document.createElement('canvas');
img.width = width;
img.height = height;
img.getContext("2d").putImageData(imageData, 0, 0);
context.drawImage(img, x, y);
},
js_text: function(x, y, n, chars, height, top, angle, bold, italic, align, valign, font, colia) {
var context = Module.context;
var rgb = Module.HEAPU8.subarray(colia, colia + 3);
context.beginPath();
context.fillStyle = "rgb(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + ")";
var strboit = "";
if (bold && italic) {
strboit = "bold italic";
} else if (italic) {
strboit = "italic";
} else if (bold) {
strboit = "bold";
}
var fonts = [
'"Times New Roman", Times, serif',
'Helvetica, Arial, sans-serif',
'Courier, monospace',
'Symbol',
'"Bookman Old Style", serif',
'"Century Schoolbook", serif',
'"Century Gothic", sans-serif',
'"Palatino Linotype", "Book Antiqua", Palatino, serif'
];
context.font = strboit + " " + height + "px " + fonts[font];
var valg = 0;
if (valign == 1) {
valg = 1.2;
} else if (valign == 2) {
valg = 1;
} else if (valign == 3) {
valg = 0.5;
} else if (valign == 5) {
valg = -0.2;
}
context.translate(x, y);
context.rotate(angle * Math.PI / 180);
if (align == 1) {
context.textAlign = "center";
} else if (align == 2) {
context.textAlign = "right";
} else {
context.textAlign = "left";
}
var text = UTF8ToString(chars);
context.fillText(text, 0, top * context.canvas.height * valg);
context.setTransform(Module.dpr, 0, 0, Module.dpr, 0, 0);
},
js_line_routine: function(n, px, py, linetype, fill, width, rgb) {
px = Module.HEAPF64.subarray(px / 8, px / 8 + n);
py = Module.HEAPF64.subarray(py / 8, py / 8 + n);
rgb = Module.HEAPU8.subarray(rgb, rgb + 4);
var context = Module.context;
context.beginPath();
context.setLineDash(Module.get_dash_list(linetype));
context.strokeStyle = "rgba(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + "," + rgb[3] + ")";
context.fillStyle = "rgba(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + "," + rgb[3] + ")";
context.lineWidth = width;
context.moveTo(px[0], py[0]);
var nan_found = false;
for (var i = 1; i < n; i++) {
if (Number.isNaN(px[i]) && Number.isNaN(py[i])) {
nan_found = true;
continue;
}
if (nan_found) {
nan_found = false;
if (linetype == 0) {
context.closePath();
}
context.moveTo(px[i], py[i]);
} else {
context.lineTo(px[i], py[i]);
}
}
if (linetype == 0) {
context.closePath();
}
context.stroke();
if (fill != 0) {
context.fill("evenodd");
}
},
js_point: function(x, y, colia) {
var rgb = Module.HEAPU8.subarray(colia, colia + 3);
var context = Module.context;
context.beginPath();
context.fillStyle = "rgba(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + "," + 255 + ")";
context.fillRect(x, y, 1, 1);
},
js_line: function(x1, y1, x2, y2, colia) {
var rgb = Module.HEAPU8.subarray(colia, colia + 3);
var context = Module.context;
context.beginPath();
context.lineWidth = 1;
context.strokeStyle = "rgba(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + "," + 255 + ")";
context.moveTo(x1, y1);
context.lineTo(x2, y2);
context.stroke();
},
js_circle: function(x, y, r, fill, colia) {
var rgb = Module.HEAPU8.subarray(colia, colia + 3);
var context = Module.context;
context.beginPath();
context.lineWidth = 1;
context.fillStyle = "rgba(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + "," + 255 + ")";
context.arc(x, y, r, 0, 2 * Math.PI);
if (fill == 1) {
context.fill("evenodd");
} else {
context.stroke();
}
},
js_clip_path: function(x, y, width, height) {
var context = Module.context;
context.restore();
context.save();
context.beginPath();
context.rect(x, y, width, height);
context.clip();
},
js_reset_clipping: function() {
var context = Module.context;
context.restore();
context.save();
},
js_clear: function() {
var context = Module.context;
context.restore();
context.save();
context.clearRect(0, 0, parseInt(Module.canvas.width / Module.dpr, 10), parseInt(Module.canvas.height / Module.dpr, 10));
},
js_get_ws_width: function() {
return parseInt(Module.canvas.width / Module.dpr, 10);
},
js_get_ws_height: function() {
return parseInt(Module.canvas.height / Module.dpr, 10);
},
js_draw_path: function(n, px, py, nc, codes, bcoli, facoli, linewidth, to_DC_) {
px = Module.HEAPF64.subarray(px / 8, px / 8 + n);
py = Module.HEAPF64.subarray(py / 8, py / 8 + n);
codes = Module.HEAPU32.subarray(codes / 4, codes / 4 + nc);
facoli = Module.HEAPU8.subarray(facoli, facoli + 4);
bcoli = Module.HEAPU8.subarray(bcoli, bcoli + 4);
var i, j;
var x = new Array(3), y = new Array(3), w, h, a1, a2;
var cur_x = 0, cur_y = 0;
var start_x = 0, start_y = 0;
var context = Module.context;
to_DC = function(n, x, y) {
var x_ = _malloc(x.length * 8);
var y_ = _malloc(y.length * 8);
Module.HEAPF64.set(x, x_ / 8);
Module.HEAPF64.set(y, y_ / 8);
dynCall('viii', to_DC_, [n, x_, y_]);
x__ = Module.HEAPF64.subarray(x_ / 8, x_ / 8 + x.length);
y__ = Module.HEAPF64.subarray(y_ / 8, y_ / 8 + y.length);
for(var i = 0; i < n; ++i) {
x[i] = x__[i];
y[i] = y__[i];
}
_free(x_);
_free(y_);
};
context.beginPath();
context.strokeStyle = "rgba(" + bcoli[0] + "," + bcoli[1] + "," + bcoli[2] + "," + bcoli[3] + ")";
context.fillStyle = "rgba(" + facoli[0] + "," + facoli[1] + "," + facoli[2] + "," + facoli[3] + ")";
context.lineWidth = linewidth;
j = 0;
for (i = 0; i < nc; ++i)
{
var code = String.fromCharCode(codes[i]);
switch (code) {
case 'M':
case 'm':
x[0] = px[j];
y[0] = py[j];
if (code == 'm') {
x[0] += cur_x;
y[0] += cur_y;
}
cur_x = start_x = x[0];
cur_y = start_y = y[0];
to_DC(1, x, y);
context.moveTo(x[0], y[0]);
j += 1;
break;
case 'L':
case 'l':
x[0] = px[j];
y[0] = py[j];
if (code == 'l') {
x[0] += cur_x;
y[0] += cur_y;
}
cur_x = x[0];
cur_y = y[0];
to_DC(1, x, y);
context.lineTo(x[0], y[0]);
j += 1;
break;
case 'Q':
case 'q':
x[0] = px[j];
y[0] = py[j];
if (code == 'q') {
x[0] += cur_x;
y[0] += cur_y;
}
x[1] = px[j + 1];
y[1] = py[j + 1];
if (code == 'q') {
x[1] += cur_x;
y[1] += cur_y;
}
cur_x = x[1];
cur_y = y[1];
to_DC(2, x, y);
context.quadraticCurveTo(x[0], y[0], x[1], y[1]);
j += 2;
break;
case 'C':
case 'c':
x[0] = px[j];
y[0] = py[j];
if (code == 'c') {
x[0] += cur_x;
y[0] += cur_y;
}
x[1] = px[j + 1];
y[1] = py[j + 1];
if (code == 'c') {
x[1] += cur_x;
y[1] += cur_y;
}
x[2] = px[j + 2];
y[2] = py[j + 2];
if (code == 'c') {
x[2] += cur_x;
y[2] += cur_y;
}
cur_x = x[2];
cur_y = y[2];
to_DC(3, x, y);
context.bezierCurveTo(x[0], y[0], x[1], y[1], x[2], y[2]);
j += 3;
break;
case 'A':
case 'a':
{
var rx = Math.abs(px[j]);
var ry = Math.abs(py[j]);
a1 = px[j + 1];
a2 = py[j + 1];
var cx = cur_x - rx * Math.cos(a1);
var cy = cur_y - ry * Math.sin(a1);
x[0] = cx - rx;
y[0] = cy - ry;
x[1] = cx + rx;
y[1] = cy + ry;
cur_x = cx + rx * Math.cos(a2);
cur_y = cy + ry * Math.sin(a2);
}
to_DC(2, x, y);
w = x[1] - x[0];
h = y[1] - y[0];
var anticlockwise = a1 < a2;
// Use negative angles since the canvas uses a swapped y axis
context.ellipse(x[0] + 0.5 * w, y[0] + 0.5 * h, Math.abs(w * 0.5), Math.abs(h * 0.5), 0, -a1, -a2, anticlockwise);
j += 3;
break;
case 's': /* close and stroke */
context.closePath();
cur_x = start_x;
cur_y = start_y;
context.stroke();
break;
case 'S': /* stroke */
context.stroke();
break;
case 'F': /* fill (even-odd rule) and stroke */
case 'G': /* fill (winding rule) and stroke */
context.closePath();
cur_x = start_x;
cur_y = start_y;
context.fill(code === "F" ? "evenodd" : "nonzero");
context.stroke();
break;
case 'f': /* fill (even-odd rule) */
case 'g': /* fill (winding rule) */
context.closePath();
cur_x = start_x;
cur_y = start_y;
context.fill(code === "f" ? "evenodd" : "nonzero");
break;
case 'Z': /* closepath */
context.closePath();
cur_x = start_x;
cur_y = start_y;
break;
case '\0':
break;
default:
console.log("invalid path code ('" + code + "')");
return;
}
}
}
});